June 30, 201511 yr Since these are still relatively new drives, I thought I'd post my preclear results for the 2 ST8000AS0002 I just installed: : ========================================================================1.15 : == invoked as: ./preclear_disk.sh /dev/sdb : == ST8000AS0002-1NA17Z Z8403xxx : == Disk /dev/sdb has been successfully precleared : == with a starting sector of 1 : == Ran 1 cycle : == : == Using :Read block size = 1000448 Bytes : == Last Cycle's Pre Read Time : 19:44:58 (112 MB/s) : == Last Cycle's Zeroing time : 16:22:29 (135 MB/s) : == Last Cycle's Post Read Time : 37:42:48 (58 MB/s) : == Last Cycle's Total Time : 73:51:20 : == : == Total Elapsed Time 73:51:20 : == : == Disk Start Temperature: 25C : == : == Current Disk Temperature: 37C, " : == : ============================================================================ : ** Changed attributes in files: /tmp/smart_start_sdb /tmp/smart_finish_sdb : ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE : Raw_Read_Error_Rate = 111 100 6 ok 35617992 : Seek_Error_Rate = 73 100 30 ok 21054924 : Spin_Retry_Count = 100 100 97 near_thresh 0 : End-to-End_Error = 100 100 99 near_thresh 0 : Airflow_Temperature_Cel = 63 75 45 near_thresh 37 : Temperature_Celsius = 37 25 0 ok 37 : Hardware_ECC_Recovered = 111 100 0 ok 35617992 : 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 1. : 0 sectors were pending re-allocation after zero of disk in cycle 1 of 1. : 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. : ============================================================================ : ========================================================================1.15 : == invoked as: ./preclear_disk.sh /dev/sdc : == ST8000AS0002-1NA17Z Z8403xxx : == Disk /dev/sdc has been successfully precleared : == with a starting sector of 1 : == Ran 1 cycle : == : == Using :Read block size = 1000448 Bytes : == Last Cycle's Pre Read Time : 19:52:10 (111 MB/s) : == Last Cycle's Zeroing time : 16:32:45 (134 MB/s) : == Last Cycle's Post Read Time : 37:49:29 (58 MB/s) : == Last Cycle's Total Time : 74:15:27 : == : == Total Elapsed Time 74:15:27 : == : == Disk Start Temperature: 26C : == : == 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 : Raw_Read_Error_Rate = 112 100 6 ok 45860856 : Seek_Error_Rate = 73 100 30 ok 21308774 : Spin_Retry_Count = 100 100 97 near_thresh 0 : End-to-End_Error = 100 100 99 near_thresh 0 : Airflow_Temperature_Cel = 62 74 45 near_thresh 38 : Temperature_Celsius = 38 26 0 ok 38 : Hardware_ECC_Recovered = 112 100 0 ok 45860856 : 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 1. : 0 sectors were pending re-allocation after zero of disk in cycle 1 of 1. : 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. : ============================================================================ Those are fine. I "personally" would like to see the temps a "little" lower BUT they are well within manufacturers tolerances for those drives especially at high load. And 40'c is the break point for me so you are good imho. Furthermore, I would have run the disk through 3 cycles and a further long S.M.A.R.T test to gain a stronger degree of assurance that the disks are ok before trusting them with my data. That however is your risk to own - so your call.
June 30, 201511 yr I only wonder why Pre Read was at much faster speed than Post Read? That's normal. There's a different version posted by bjp999 that does the post-read faster (in roughly the same time as the pre-read) ... but the longer post-read is normal for JoeL's script.
June 30, 201511 yr I only wonder why Pre Read was at much faster speed than Post Read? It is normal for the last pass to be slower. Almost 1/2 speed of first pass is about right - unless you're using Brian's "Faster" preclear script. I believe the reason it is slower is that the last pass is a full read AND verify of the zeros written. Not sure if it's read is random too!?
June 30, 201511 yr I only wonder why Pre Read was at much faster speed than Post Read? That's normal. There's a different version posted by bjp999 that does the post-read faster (in roughly the same time as the pre-read) ... but the longer post-read is normal for JoeL's script. Man you're fast!!!
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