[root@isengard ~]# mdadm --detail /dev/md3
/dev/md3:
Version : 1.2
Creation Time : Mon Jul 28 23:31:31 2014
Raid Level : raid10
Array Size : 7813531648 (7451.56 GiB 8001.06 GB)
Used Dev Size : 1953382912 (1862.89 GiB 2000.26 GB)
Raid Devices : 8
Total Devices : 8
Persistence : Superblock is persistent
Update Time : Mon Oct 27 21:45:02 2025
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Name : isengard.loc:3 (local to host isengard.loc)
UUID : 99f0389f:dbf75cb3:c841340e:33f62841
Events : 4879327
Number Major Minor RaidDevice State
0 8 16 0 active sync set-A /dev/sdb
9 8 112 1 active sync set-B /dev/sdh
2 8 32 2 active sync set-A /dev/sdc
3 8 0 3 active sync set-B /dev/sda
4 8 96 4 active sync set-A /dev/sdg
8 8 48 5 active sync set-B /dev/sdd
6 8 64 6 active sync set-A /dev/sde
7 8 80 7 active sync set-B /dev/sdf
[root@isengard ~]#
[root@isengard ~]#
[root@isengard ~]#
[root@isengard ~]#
[root@isengard ~]# smartctl -a /dev/sdb
smartctl 5.43 2016-09-28 r4347 [x86_64-linux-2.6.32-754.6.3.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Red
Device Model: WDC WD20EFRX-68AX9N0
Serial Number: WD-WMC300507991
LU WWN Device Id: 5 0014ee 6ad81e667
Firmware Version: 80.00A80
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ACS-2 (revision not indicated)
Local Time is: Mon Oct 27 21:45:11 2025 EDT
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: (27720) 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: ( 280) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x70bd) 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 177 175 021 Pre-fail Always - 4150
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 30
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 001 001 000 Old_age Always - 99499
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 - 30
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 29
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 0
194 Temperature_Celsius 0x0022 118 109 000 Old_age Always - 29
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.