December 20, 201411 yr My 2nd Red 6TB drive seems to have a significantly slower zeroing timing than the first one I bought several months ago. (unraid 5.0.5) 1st WD Red 6TB (updated info) precleared while on vacation, therefore, no other apps (e.g. Plex) running == WDCWD60EFRX-68MYMN1 == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:21:05 (124 MB/s) == Last Cycle's Zeroing time : 12:07:27 (137 MB/s) == Last Cycle's Post Read Time : 26:19:26 (63 MB/s) == Last Cycle's Total Time : 38:27:52 == Total Elapsed Time 128:41:48 == Disk Start Temperature: 33C == Current Disk Temperature: 37C, 2nd WD Red 6TB - zeroing seems much slower == WDCWD60EFRX-68MYMN1 == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:42:57 (121 MB/s) == Last Cycle's Zeroing time : 17:15:43 (96 MB/s) == Last Cycle's Post Read Time : 27:40:40 (60 MB/s) == Last Cycle's Total Time : 44:57:22 == Total Elapsed Time 146:30:34 == Disk Start Temperature: 37C == Current Disk Temperature: 38C, Update: 3rd WD Red 6TB - seems consistent with the 2nd preclear, though even slower == invoked as: ./preclear_disk.sh -A -c 3 /dev/sdc == WDCWD60EFRX-68MYMN1 WD-WX21D947NSHF == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:31:58 (123 MB/s) == Last Cycle's Zeroing time : 16:16:42 (102 MB/s) == Last Cycle's Post Read Time : 26:38:58 (62 MB/s) == Last Cycle's Total Time : 42:56:39 == Total Elapsed Time 159:15:54 == Disk Start Temperature: 31C == Current Disk Temperature: 35C, Helium 6TB for comparison == HGSTHUS726060ALA640 == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 11:59:36 (138 MB/s) == Last Cycle's Zeroing time : 11:40:15 (142 MB/s) == Last Cycle's Post Read Time : 23:40:32 (70 MB/s) == Last Cycle's Total Time : 35:21:46 == Total Elapsed Time 118:03:47 == Disk Start Temperature: 31C == Current Disk Temperature: 38C, Are such variances typical? (e.g. CPU loads, etc) What's worrying is that a 3rd Red 6TB that I am pre-clearing right now, seems to have an even worse zeroing time (Pre-read + 75% zeroing @ 36 hours elapsed). Despite buying this 3rd drive 3 weeks after the previous one, it still has the same 20th October 2014 manufacturing date. Some other observations: - I've played around using different SATA ports. The preclear was completed on the board's SATA port. - Pre-clearing on the LSI SAS controller stalled once, and another time zeroing slowed down to about 24MB/s. LSI controller had no problems with my existing drives. - Multiple HD Tune benchmark showed no read/write speed anomalies. Starts at about 170+MB/s and steadily drops to about 70MB/s at the end of the drive. Is this a problem? Or am I just looking too much at these pre-clear timings? Full preclear results text in the next post. Thanks!!!
December 20, 201411 yr Author The slower zeroing 6TB in question: ========================================================================1.15 == invoked as: ./preclear_disk.sh -A -c 3 /dev/sdc == WDCWD60EFRX-68MYMN1 == Disk /dev/sdc has been successfully precleared == with a starting sector of 1 == Ran 3 cycles == == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:42:57 (121 MB/s) == Last Cycle's Zeroing time : 17:15:43 (96 MB/s) == Last Cycle's Post Read Time : 27:40:40 (60 MB/s) == Last Cycle's Total Time : 44:57:22 == == Total Elapsed Time 146:30:34 == == Disk Start Temperature: 37C == == Current Disk Temperature: 38C, == ============================================================================ ** Changed attributes in files: /tmp/smart_start_sdc /tmp/smart_finish_sdc ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE Seek_Error_Rate = 100 200 0 ok 0 Temperature_Celsius = 114 115 0 ok 38 No SMART attributes are FAILING_NOW 0 sectors were pending re-allocation before the start of the preclear. 0 sectors were pending re-allocation after pre-read in cycle 1 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 1 of 3. 0 sectors were pending re-allocation after post-read in cycle 1 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 2 of 3. 0 sectors were pending re-allocation after post-read in cycle 2 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 3 of 3. 0 sectors are pending re-allocation at the end of the preclear, the number of sectors pending re-allocation did not change. 0 sectors had been re-allocated before the start of the preclear. 0 sectors are re-allocated at the end of the preclear, the number of sectors re-allocated did not change. ============================================================================ ============================================================================ == == S.M.A.R.T Initial Report for /dev/sdc == Disk: /dev/sdc smartctl 6.2 2013-07-26 r3841 [i686-linux-3.9.11p-unRAID] (local build) Copyright © 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: WDC WD60EFRX-68MYMN1 LU WWN Device Id: 5 0014ee 2b5d1d0ab Firmware Version: 82.00A82 User Capacity: 6,001,175,126,016 bytes [6.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 5700 rpm Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s) Local Time is: Sun Dec 7 23:32:50 2014 SGT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 5564) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 709) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x303d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 204 204 021 Pre-fail Always - 8800 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 10 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 141 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 10 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 6 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 18 194 Temperature_Celsius 0x0022 115 111 000 Old_age Always - 37 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. == ============================================================================ ============================================================================ == == S.M.A.R.T Final Report for /dev/sdc == Disk: /dev/sdc smartctl 6.2 2013-07-26 r3841 [i686-linux-3.9.11p-unRAID] (local build) Copyright © 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: WDC WD60EFRX-68MYMN1 LU WWN Device Id: 5 0014ee 2b5d1d0ab Firmware Version: 82.00A82 User Capacity: 6,001,175,126,016 bytes [6.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 5700 rpm Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s) Local Time is: Sun Dec 14 02:03:24 2014 SGT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 5564) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 709) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x303d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 204 204 021 Pre-fail Always - 8800 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 10 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 288 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 10 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 6 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 23 194 Temperature_Celsius 0x0022 114 111 000 Old_age Always - 38 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 1 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. == ============================================================================
December 20, 201411 yr Author The first Red 6TB ========================================================================1.15 == invoked as: ./preclear_disk.sh -A -c 3 /dev/sde == WDCWD60EFRX-68MYMN1 == Disk /dev/sde has been successfully precleared == with a starting sector of 1 == Ran 3 cycles == == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:21:05 (124 MB/s) == Last Cycle's Zeroing time : 12:07:27 (137 MB/s) == Last Cycle's Post Read Time : 26:19:26 (63 MB/s) == Last Cycle's Total Time : 38:27:52 == == Total Elapsed Time 128:41:48 == == Disk Start Temperature: 33C == == Current Disk Temperature: 37C, == ============================================================================ ** Changed attributes in files: /tmp/smart_start_sde /tmp/smart_finish_sde ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE Temperature_Celsius = 115 119 0 ok 37 No SMART attributes are FAILING_NOW 0 sectors were pending re-allocation before the start of the preclear. 0 sectors were pending re-allocation after pre-read in cycle 1 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 1 of 3. 0 sectors were pending re-allocation after post-read in cycle 1 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 2 of 3. 0 sectors were pending re-allocation after post-read in cycle 2 of 3. 0 sectors were pending re-allocation after zero of disk in cycle 3 of 3. 0 sectors are pending re-allocation at the end of the preclear, the number of sectors pending re-allocation did not change. 0 sectors had been re-allocated before the start of the preclear. 0 sectors are re-allocated at the end of the preclear, the number of sectors re-allocated did not change. ============================================================================ ============================================================================ == == S.M.A.R.T Initial Report for /dev/sde == Disk: /dev/sde smartctl 6.2 2013-07-26 r3841 [i686-linux-3.9.11p-unRAID] (local build) Copyright © 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: WDC WD60EFRX-68MYMN1 LU WWN Device Id: 5 0014ee 2b5aeca78 Firmware Version: 82.00A82 User Capacity: 6,001,175,126,016 bytes [6.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 5700 rpm Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Mon Oct 13 02:08:11 2014 SGT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 3584) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 689) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x303d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 100 253 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 100 253 021 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 3 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 0 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 3 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 0 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 3 194 Temperature_Celsius 0x0022 119 119 000 Old_age Always - 33 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 253 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. == ============================================================================ ============================================================================ == == S.M.A.R.T Final Report for /dev/sde == Disk: /dev/sde smartctl 6.2 2013-07-26 r3841 [i686-linux-3.9.11p-unRAID] (local build) Copyright © 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: WDC WD60EFRX-68MYMN1 LU WWN Device Id: 5 0014ee 2b5aeca78 Firmware Version: 82.00A82 User Capacity: 6,001,175,126,016 bytes [6.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 5700 rpm Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Sat Oct 18 10:49:59 2014 SGT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 3584) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 689) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x303d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 100 253 021 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 3 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 128 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 3 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 0 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 4 194 Temperature_Celsius 0x0022 115 112 000 Old_age Always - 37 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. == ============================================================================ Preclear timings for some of my other drives Red 4TB == WDCWD40EFRX-68WT0N0 == Ran 2 cycles == Using :Read block size = 65536 Bytes == Last Cycle's Pre Read Time : 11:08:48 (99 MB/s) == Last Cycle's Zeroing time : 10:09:10 (109 MB/s) == Last Cycle's Post Read Time : 21:21:27 (52 MB/s) == Last Cycle's Total Time : 31:31:36 == Total Elapsed Time 74:07:24 Red 4TB == WDCWD40EFRX-68WT0N0 == Ran 2 cycles == Using :Read block size = 65536 Bytes == Last Cycle's Pre Read Time : 10:38:06 (104 MB/s) == Last Cycle's Zeroing time : 9:42:59 (114 MB/s) == Last Cycle's Post Read Time : 20:34:27 (54 MB/s) == Last Cycle's Total Time : 30:18:25 == Total Elapsed Time 71:12:00 Red Pro 4TB (trying out for my PC) == WDCWD4001FFSX-68JNUN0 == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 8:28:58 (130 MB/s) == Last Cycle's Zeroing time : 8:40:55 (128 MB/s) == Last Cycle's Post Read Time : 16:43:52 (66 MB/s) == Last Cycle's Total Time : 25:25:46 == Total Elapsed Time 85:11:17
December 20, 201411 yr My motherboard pre-clear times are significantly better than my AOC-SAS2LP times - perhaps 17% better for a full cycle?
December 21, 201411 yr Author Heh looks like its gonna take 72 full hours to finish a preclear cycle (with pre-read)
December 21, 201411 yr I think it just depends on the system and how busy it is, plus the options you invoke preclear with. My first took 69.5 hours while my second took ~72. ========================================================================1.15 == invoked as: ./preclear_disk.sh -c 1 -w 32768 -r 32768 -b 1000 /dev/sdh == WDCWD60EFRX-68MYMN1 xxxxxxxxxxxxxxxxxx == Disk /dev/sdh has been successfully precleared == with a starting sector of 1 == Ran 1 cycle == == Using :Read block size = 32768 Bytes == Last Cycle's Pre Read Time : 21:25:09 (77 MB/s) == Last Cycle's Zeroing time : 12:19:57 (135 MB/s) == Last Cycle's Post Read Time : 35:46:00 (46 MB/s) == Last Cycle's Total Time : 69:32:05 == == Total Elapsed Time 69:32:05
December 22, 201411 yr Author Switchman I think you might be on to something - my first preclear was done while I was away on vacation, hence absolutely no other activity such as Plex.
December 25, 201411 yr Author Heh 3rd WD 6TB finished preclear, on Christmas. MERRY CHRISTMAS!!! == invoked as: ./preclear_disk.sh -A -c 3 /dev/sdc == WDCWD60EFRX-68MYMN1 WD-WX21D947NSHF == Ran 3 cycles == Using :Read block size = 8388608 Bytes == Last Cycle's Pre Read Time : 13:31:58 (123 MB/s) == Last Cycle's Zeroing time : 16:16:42 (102 MB/s) == Last Cycle's Post Read Time : 26:38:58 (62 MB/s) == Last Cycle's Total Time : 42:56:39 == Total Elapsed Time 159:15:54 == Disk Start Temperature: 31C == Current Disk Temperature: 35C,
December 25, 201411 yr I've seen fairly notable differences on pre-clears as well. While they're not CPU-intensive operations, nevertheless the bus activity is notably different based on just how much activity is going on with the other disks. So if the pre-clear is the only activity, it'll likely be appreciably faster than if there is a lot of UnRAID activity ... or even if you have multiple pre-clears going on at the same time. ... in short -- I don't think there's anything to worry about Have a Great Christmas
December 25, 201411 yr Author Thanks, gary!! Heh I can't wait for the 10TBs to become available. 2-week preclears FTW!!! MERRY CHRISTMAS!
December 25, 201411 yr ... Heh I can't wait for the 10TBs to become available ... Capacity is a never-ending quest !! ... I still remember just how large I thought my first hard drive was => a 26MB Seagate 14" drive for the bargain price of $4500 (1 10% discount off it's retail price) That's "only" $173,076.923.08 per TB !!
December 25, 201411 yr Author Whoah!!! $4,500 is a princely sum! And not even accounting for today's value after inflation, heh. My first was a 1.2Gb Quantum. The guy said "you can put everything you want inside!!!"
December 25, 201411 yr Yes, that was $4500 1980 dollars => the equivalent of $13,672.80 in 2014 dollars => so in today's dollars that was $525,876,923.09 per TB !!!!! A 2TB drive would cost over a billion dollars at that rate !! ... I think the price of storage has dropped a bit since I bought that drive :)
December 25, 201411 yr ... Just for grins, this is the drive (the 26MB version) I bought way back when: http://www.vintagecomputer.net/CISC367/Byte%20March%201981%20Ad%20-%20Morrow%2026%20MB%20Hard%20disk%20system.pdf
December 26, 201411 yr ... Just for grins, this is the drive (the 26MB version) I bought way back when: http://www.vintagecomputer.net/CISC367/Byte%20March%201981%20Ad%20-%20Morrow%2026%20MB%20Hard%20disk%20system.pdf Looks like the date of that Byte Magazine was March 20, 1981. Is that correct? If so, that was about the time that I purchased my first computer--- A Radio Shack Color Computer with 16KB of memory and a cassette tape deck for data and program storage. I can't remember the cost but it was north of $350!
December 26, 201411 yr Looks like the date of that Byte Magazine was March 20, 1981. Is that correct? If so, that was about the time that I purchased my first computer--- A Radio Shack Color Computer with 16KB of memory and a cassette tape deck for data and program storage. I can't remember the cost but it was north of $350! Sounds about right. I was thinking it was 1980 when I bought the disk, but it must have been 1981. By '81 I was on about my 6th or 7th computer -- Altair, IMSAI, North Star, Digital Group, Heathkit H11, Cromemco ... all of which were in the 2-3 thousand range. PC's were an expensive hobby in the 70's ... I remember buying a 16K memory board for well over a thousand dollars. And when you figure what those numbers are in today's dollars, it was a REALLY expensive hobby !! Haha out of curiosity, how long did that hard disk last? It never died -- I eventually gave it away (~1990 or so) to a collector who had a bunch of old S-100 gear.
December 26, 201411 yr Looks like the date of that Byte Magazine was March 20, 1981. Is that correct? If so, that was about the time that I purchased my first computer--- A Radio Shack Color Computer with 16KB of memory and a cassette tape deck for data and program storage. I can't remember the cost but it was north of $350! Sounds about right. I was thinking it was 1980 when I bought the disk, but it must have been 1981. By '81 I was on about my 6th or 7th computer -- Altair, IMSAI, North Star, Digital Group, Heathkit H11, Cromemco ... all of which were in the 2-3 thousand range. PC's were an expensive hobby in the 70's ... I remember buying a 16K memory board for well over a thousand dollars. And when you figure what those numbers are in today's dollars, it was a REALLY expensive hobby !! Haha out of curiosity, how long did that hard disk last? It never died -- I eventually gave it away (~1990 or so) to a collector who had a bunch of old S-100 gear. I remember lusting after those kits as a poor college student. After college my job involved making Commodore PETs do lab data collection, and I took one of those home to play with for my first computer. 8K RAM, cassette tape, and built-in monochrome CRT. Don't remember the exact cost but I think it was under $1000.
December 26, 201411 yr Yes, a PET was well under $1000 ... by the time they came out the PC hobby was rapidly switching to an off-the-shelf commercial product lineup with prices WAY below what the early adopter hobbyists had paid. I was spending FAR more than I could really afford on my hobby, but I was "hooked" -- and I had a 2nd job that I worked primarily to cover the expenses of my hobby I spent almost a year's income (at the 2nd job) on that hard drive in 1981 !! [but I really wanted one ] Sometime in that same time frame I bought a NEC Spinwriter printer that also cost close to $4000 !! My first printer had been a 9-pin dot matrix that was about $800 as a KIT that you had to put together (in ~ 1978).
December 27, 201411 yr Author Heh, in contrast, today a raspberry pi costs just a few cups of Starbucks!
December 27, 201411 yr Yes, if you've been doing this long enough, today's PCs seem just about free For what I once paid for a 16KB memory card (~ $1400) you can buy one heck-of-a-system today ... I just built my wife a new PC with a Core i7-4790, 16GB of RAM, a 500GB SSD and 3TB aux drive; a 23" touch screen monitor, and a few other goodies and spent a good bit less than that !! And that was $1400 1977 dollars !!
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