It's not probable but not impossible that 4 disks died in 6 months. Crazy though. One of the other drives shows partial smart errorrs. When I try to format it in a pool I think it's giving errors. Or something preventing formatting in the pool. That one prompts this on smartctl @Tower:~# smartctl -x /dev/sdb
smartctl 7.5 2025-04-30 r5714 [x86_64-linux-6.12.54-Unraid] (local build)
Copyright (C) 2002-25, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor:
Product: OOS22000G
Revision: OOS1
Compliance: SPC-5
User Capacity: 22,000,969,973,760 bytes [22.0 TB]
Logical block size: 512 bytes
Physical block size: 4096 bytes
LU is fully provisioned
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Logical Unit id: 0x5000c500da7b0e93
Serial number: 00009JGJ
Device type: disk
Transport protocol: SAS (SPL-4)
Local Time is: Fri Feb 27 09:58:30 2026 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Enabled
Read Cache is: Enabled
Writeback Cache is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Format status indicates no format since manufacture
Current temperature = 29
Lifetime maximum temperature = 34
Lifetime minimum temperature = 20
Maximum temperature since power on = 34
Minimum temperature since power on = 20
Relative humidity = 0
Lifetime maximum relative humidity = 0
Lifetime minimum relative humidity = 0
Maximum relative humidity since power on = 0
Minimum relative humidity since power on = 0
Manufactured in week 46 of year 2023
Specified cycle count over device lifetime: 50000
Accumulated start-stop cycles: 1955
Specified load-unload count over device lifetime: 600000
Accumulated load-unload cycles: 3811
Elements in grown defect list: 0
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 0 3 0 3 3 0.028 0
write: 0 0 0 0 0 21.067 0
Non-medium error count: 0
scsiPrintPendingDefectsLPage Failed [device not ready]
[GLTSD (Global Logging Target Save Disable) set. Enable Save with '-S on']
SMART Self-test log
Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ]
Description number (hours)
# 1 Background long Failed in segment --> - 12962 336190904 [0x3 0x11 0x0]
# 2 Background long Failed in segment --> - 12785 336190904 [0x3 0x11 0x0]
# 3 Background short Completed - 12284 - [- - -]
# 4 Background long Aborted (device reset ?) - 2310 - [- - -]
# 5 Background long Aborted (device reset ?) - 2271 - [- - -]
# 6 Background long Aborted (by user command) - 2271 - [- - -]
Long (extended) Self-test duration: 114660 seconds [31.9 hours]
Background scan results log
Status: no scans active
Accumulated power on time, hours:minutes 13238:19 [794299 minutes]
Number of background scans performed: 0, scan progress: 0.00%
Number of background medium scans performed: 0
# when lba(hex) [sk,asc,ascq] reassign_status
1 7452:29 0000000119aad0b8 [3,11,0] Recovered via rewrite in-place
2 7452:29 0000000119aad0c0 [3,11,0] Recovered via rewrite in-place
3 7452:30 0000000119aad0c8 [3,11,0] Recovered via rewrite in-place
4 7452:30 0000000119aad0d0 [3,11,0] Recovered via rewrite in-place
5 7452:30 0000000119aad0d8 [3,11,0] Recovered via rewrite in-place
6 7452:30 0000000119aad0e0 [3,11,0] Recovered via rewrite in-place
7 7452:30 0000000119aad0e8 [3,11,0] Recovered via rewrite in-place
8 7452:30 0000000119aad0f0 [3,11,0] Recovered via rewrite in-place
9 7452:30 0000000119aae0c8 [3,11,0] Recovered via rewrite in-place
10 7500:39 0000000119aad738 [3,11,0] Recovered via rewrite in-place
11 7500:39 0000000119aad748 [3,11,0] Recovered via rewrite in-place
12 7500:39 0000000119aad750 [3,11,0] Recovered via rewrite in-place
13 7500:39 0000000119aad758 [3,11,0] Recovered via rewrite in-place
14 7500:39 0000000119aad760 [3,11,0] Recovered via rewrite in-place
15 7500:39 0000000119aad768 [3,11,0] Recovered via rewrite in-place
16 7500:39 0000000119aad770 [3,11,0] Recovered via rewrite in-place
17 7500:39 0000000119aad7b8 [3,11,0] Recovered via rewrite in-place
18 7500:39 0000000119aad7c8 [3,11,0] Recovered via rewrite in-place
19 7500:39 0000000119aad7d0 [3,11,0] Recovered via rewrite in-place
20 7500:39 0000000119aad7d8 [3,11,0] Recovered via rewrite in-place
21 7500:39 0000000119aad7e0 [3,11,0] Recovered via rewrite in-place
22 7500:39 0000000119aad7e8 [3,11,0] Recovered via rewrite in-place
23 7500:40 0000000119aad7f0 [3,11,0] Recovered via rewrite in-place
24 7500:40 0000000119aad8c8 [3,11,0] Recovered via rewrite in-place
25 7500:40 0000000119aad8d0 [3,11,0] Recovered via rewrite in-place
26 7500:40 0000000119aad8f0 [3,11,0] Recovered via rewrite in-place
27 7500:41 0000000119aace80 [3,11,0] Recovered via rewrite in-place
28 7500:41 0000000119aacfc0 [3,11,0] Recovered via rewrite in-place
29 7500:43 0000000119aad280 [3,11,0] Recovered via rewrite in-place
30 7500:45 0000000119aadd40 [3,11,0] Recovered via rewrite in-place
31 7500:45 0000000119aadf80 [3,11,0] Recovered via rewrite in-place
32 7503:16 0000000119aad6a8 [3,11,0] Recovered via rewrite in-place
33 7503:16 0000000119aadb58 [3,11,0] Recovered via rewrite in-place
34 7503:18 0000000119aadfb8 [3,11,0] Recovered via rewrite in-place
35 7503:18 0000000119aae1e0 [3,11,0] Recovered via rewrite in-place
36 7506:50 0000000119aae488 [3,11,0] Recovered via rewrite in-place
37 7661:35 0000000119abfc20 [3,11,0] Recovered via rewrite in-place
38 7661:35 0000000119abfc28 [3,11,0] Recovered via rewrite in-place
39 7661:35 0000000119abfc30 [3,11,0] Recovered via rewrite in-place
40 7661:35 0000000119abfc38 [3,11,0] Recovered via rewrite in-place
41 7661:35 0000000119abfc40 [3,11,0] Recovered via rewrite in-place
42 7661:35 0000000119abfc48 [3,11,0] Recovered via rewrite in-place
43 7661:35 0000000119abfc50 [3,11,0] Recovered via rewrite in-place
44 7661:35 0000000119abfc58 [3,11,0] Recovered via rewrite in-place
45 8056:58 0000000161aae200 [3,11,0] Recovered via rewrite in-place
46 8102:03 0000000161aadc38 [3,11,0] Recovered via rewrite in-place
47 8319:06 0000000161aad150 [3,11,0] Recovered via rewrite in-place
48 8497:29 0000000161aaddc8 [3,11,0] Recovered via rewrite in-place
49 8721:25 0000000161aae068 [3,11,0] Recovered via rewrite in-place
50 8770:06 0000000161aacc70 [3,11,0] Recovered via rewrite in-place
Device does not support General statistics and performance logging
Protocol Specific port log page for SAS SSP
relative target port id = 1
generation code = 14
number of phys = 1
phy identifier = 0
attached device type: SAS or SATA device
attached reason: unknown
reason: unknown
negotiated logical link rate: phy enabled; 12 Gbps
attached initiator port: ssp=1 stp=1 smp=1
attached target port: ssp=0 stp=0 smp=0
SAS address = 0x5000c500da7b0e91
attached SAS address = 0x500605b010a1766c
attached phy identifier = 11
Invalid DWORD count = 0
Running disparity error count = 0
Loss of DWORD synchronization count = 22
Phy reset problem count = 0
relative target port id = 2
generation code = 14
number of phys = 1
phy identifier = 1
attached device type: no device attached
attached reason: unknown
reason: unknown
negotiated logical link rate: phy enabled; unknown
attached initiator port: ssp=0 stp=0 smp=0
attached target port: ssp=0 stp=0 smp=0
SAS address = 0x5000c500da7b0e92
attached SAS address = 0x0
attached phy identifier = 0
Invalid DWORD count = 0
Running disparity error count = 0
Loss of DWORD synchronization count = 0
Phy reset problem count = 0