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I have an array of 4 identical 1.5TB WD drives (3 data, 1 parity).  One is likely failing and I'm just going to replace.  I have found the exact same drive still for sale but it would be likely refurbished or old stock that has been sitting around for years.

 

Is there any concern with replacing the failed data drive with different brand, model, RPM? (all current drives are 5400RPM).  Also, 1.5TB is a bit difficult to come across.   I know i could use a 2TB but only be able to use as much as my parity drive size but is there any other issues with that?

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15 minutes ago, rgeorge123 said:

Is there any concern with replacing the failed data drive with different brand, model, RPM?

None, most users have miscellaneous drives in the same array.

 

16 minutes ago, rgeorge123 said:

I know i could use a 2TB but only be able to use as much as my parity drive size but is there any other issues with that?

None again, if the drive you need to replace is not parity you can use the parity swap procedure:

 

https://wiki.lime-technology.com/The_parity_swap_procedure

 

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Here is the smartctl report.  I was getting warning about the overall array and especially this disk for current pending sectors and offline uncorrectable.  I also see a big number in the multi zone error rate section.  Maybe it would be ok with a preclear but not a big deal to spend the money on a new 4TB parity drive and be prepared for the future.

 

smartctl 6.5 2016-05-07 r4318 [x86_64-linux-4.9.30-unRAID] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Green
Device Model:     WDC WD15EADS-00P8B0
Serial Number:    WD-WCAVU0290298
LU WWN Device Id: 5 0014ee 0ac4f4923
Firmware Version: 01.00A01
User Capacity:    1,500,301,910,016 bytes [1.50 TB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Wed Nov 29 11:30:43 2017 EST
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:  (0x85)	Offline data collection activity
					was aborted by an interrupting command from host.
					Auto Offline Data Collection: Enabled.
Self-test execution status:      ( 121)	The previous self-test completed having
					the read element of the test failed.
Total time to complete Offline 
data collection: 		(35100) 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: 	 ( 400) minutes.
Conveyance self-test routine
recommended polling time: 	 (   5) minutes.
SCT capabilities: 	       (0x303f)	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   193   179   021    Pre-fail  Always       -       5316
  4 Start_Stop_Count        0x0032   095   095   000    Old_age   Always       -       5007
  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   015   015   000    Old_age   Always       -       62069
 10 Spin_Retry_Count        0x0032   100   100   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       -       88
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       61
193 Load_Cycle_Count        0x0032   183   183   000    Old_age   Always       -       53041
194 Temperature_Celsius     0x0022   116   100   000    Old_age   Always       -       34
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       44
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       5
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   129   110   000    Old_age   Offline      -       14253

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       90%     62069         1930242132
# 2  Short offline       Completed: read failure       90%     62068         1930242132
# 3  Short offline       Completed: read failure       90%     61995         1930242132

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.

 

Edited by rgeorge123
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