What happens when you unplug 1 or more devices from an mdadm RAID array to simulate a failure in Linux Ubuntu/Centos/Debian?


In short the two drives in the array were /dev/sdd and /dev/sde.  The kernel sees they were unplugged and have gone down as you can see below.
mdadm caught the first one being unplugged /dev/sde and disabled the missing drive.  However when the final drive that was part of the array is unplugged it didn't notice at all.  Instead it complains about an IO error later for drives that the kernel knows do not exist anymore.

[45817.162728] ata4: exception Emask 0x10 SAct 0x0 SErr 0x1810000 action 0xe frozen
[45817.162744] ata4: SError: { PHYRdyChg LinkSeq TrStaTrns }
[45817.162757] ata4: hard resetting link
[45817.162763] ata4: nv: skipping hardreset on occupied port
[45817.875776] ata4: SATA link down (SStatus 0 SControl 300)
[45822.876730] ata4: hard resetting link
[45822.876743] ata4: nv: skipping hardreset on occupied port
[45823.188801] ata4: SATA link down (SStatus 0 SControl 300)
[45823.188825] ata4: limiting SATA link speed to 1.5 Gbps
[45828.189782] ata4: hard resetting link
[45828.189796] ata4: nv: skipping hardreset on occupied port
[45828.501840] ata4: SATA link down (SStatus 0 SControl 300)
[45828.501862] ata4.00: disabled
[45828.501889] ata4: EH complete
[45828.501917] ata4.00: detaching (SCSI 4:0:0:0)
[45828.507327] sd 4:0:0:0: [sde] Synchronizing SCSI cache
[45828.507413] sd 4:0:0:0: [sde]
[45828.507419] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[45828.507425] sd 4:0:0:0: [sde] Stopping disk
[45828.507443] sd 4:0:0:0: [sde] START_STOP FAILED
[45828.507448] sd 4:0:0:0: [sde]
[45828.507451] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[45828.513870] md/raid10:md2: Disk failure on sde3, disabling device.
[45828.513870] md/raid10:md2: Operation continuing on 1 devices.
[45828.515601] md/raid1:md0: Disk failure on sde1, disabling device.
[45828.515601] md/raid1:md0: Operation continuing on 1 devices.
[45828.515699] md/raid1:md1: Disk failure on sde2, disabling device.
[45828.515699] md/raid1:md1: Operation continuing on 1 devices.
[45828.550897] RAID1 conf printout:
[45828.550907]  --- wd:1 rd:2
[45828.550914]  disk 0, wo:1, o:0, dev:sde1
[45828.550919]  disk 1, wo:0, o:1, dev:sdd1
[45828.550922] RAID1 conf printout:
[45828.550926]  --- wd:1 rd:2
[45828.550929]  disk 0, wo:1, o:0, dev:sde2
[45828.550933]  disk 1, wo:0, o:1, dev:sdd2
[45828.557889] RAID1 conf printout:
[45828.557891] RAID1 conf printout:
[45828.557898]  --- wd:1 rd:2
[45828.557901]  disk 1, wo:0, o:1, dev:sdd2
[45828.557908]  --- wd:1 rd:2
[45828.557913]  disk 1, wo:0, o:1, dev:sdd1
[45828.564720] RAID10 conf printout:
[45828.564742]  --- wd:1 rd:2
[45828.564749]  disk 0, wo:1, o:0, dev:sde3
[45828.564751]  disk 1, wo:0, o:1, dev:sdd3
[45828.569892] RAID10 conf printout:
[45828.569895]  --- wd:1 rd:2
[45828.569898]  disk 1, wo:0, o:1, dev:sdd3
[45828.584569] md: unbind

[45828.584599] md: unbind

[45828.601887] md: export_rdev(sde2)
[45828.606689] md: unbind

[45828.609925] md: export_rdev(sde1)
[45828.625934] md: export_rdev(sde3)
[45853.787165] ata3: exception Emask 0x10 SAct 0x0 SErr 0x1910000 action 0xe frozen
[45853.787181] ata3: SError: { PHYRdyChg Dispar LinkSeq TrStaTrns }
[45853.787194] ata3: hard resetting link
[45853.787199] ata3: nv: skipping hardreset on occupied port
[45854.502904] ata3: SATA link down (SStatus 0 SControl 300)
[45859.503897] ata3: hard resetting link
[45859.503910] ata3: nv: skipping hardreset on occupied port
[45859.815936] ata3: SATA link down (SStatus 0 SControl 300)
[45859.815959] ata3: limiting SATA link speed to 1.5 Gbps
[45864.816953] ata3: hard resetting link
[45864.816970] ata3: nv: skipping hardreset on occupied port
[45865.128991] ata3: SATA link down (SStatus 0 SControl 300)
[45865.129016] ata3.00: disabled
[45865.129049] ata3: EH complete
[45865.129082] ata3.00: detaching (SCSI 3:0:0:0)
[45865.134492] sd 3:0:0:0: [sdd] Synchronizing SCSI cache
[45865.134606] sd 3:0:0:0: [sdd]
[45865.134612] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[45865.134618] sd 3:0:0:0: [sdd] Stopping disk
[45865.134638] sd 3:0:0:0: [sdd] START_STOP FAILED
[45865.134643] sd 3:0:0:0: [sdd]
[45865.134647] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK


[46361.713303] Buffer I/O error on device md2, logical block 0
[46361.713321] Buffer I/O error on device md2, logical block 1
[46361.713333] Buffer I/O error on device md2, logical block 2
[46361.713343] Buffer I/O error on device md2, logical block 3
[46361.713352] Buffer I/O error on device md2, logical block 0
[46361.713374] Buffer I/O error on device md2, logical block 177343231
[46361.713383] Buffer I/O error on device md2, logical block 177343231
[46361.713479] Buffer I/O error on device md2, logical block 0
[46361.713491] Buffer I/O error on device md2, logical block 1
[46361.713500] Buffer I/O error on device md2, logical block 2


See below it believes the last drive (sdd) to be unplugged is still plugged in!


Personalities : [raid10] [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
md0 : active raid1 sdd1[2]
      20955008 blocks super 1.2 [2/1] [_U]
   
md1 : active raid1 sdd2[1]
      2097088 blocks [2/1] [_U]
   
md2 : active raid10 sdd3[2]
      709372928 blocks super 1.2 512K chunks 2 far-copies [2/1] [_U]
      bitmap: 0/6 pages [0KB], 65536KB chunk

 


Tags:

unplug, devices, mdadm, raid, array, simulate, linux, ubuntu, centos, debian, dev, sdd, sde, kernel, unplugged, disabled, didn, complains, io, ata, exception, emask, sact, serr, xe, serror, phyrdychg, linkseq, trstatrns, resetting, nv, skipping, hardreset, occupied, sata, sstatus, scontrol, limiting, gbps, detaching, scsi, synchronizing, cache, hostbyte, did_bad_target, driverbyte, driver_ok, disk, start_stop, md, disabling, continuing, conf, printout, wd, rd, wo, unbind, export_rdev, dispar, buffer, plugged, personalities, linear, multipath, active, _u, chunks, copies, bitmap, kb, chunk,

Latest Articles

  • Aruba/HP/Dell IAP Wireless Controller Common Default Passwords
  • Debian, Mint Ubuntu how to remove package and associated config files
  • Linux Grub not booting the intended kernel solution in Debian, Mint, Ubuntu how to specify which kernel to boot by default
  • QEMU KVM Keyboard Problems Not Working Right Repeating Characters, Ctrl+C Copy and Paste not working right when using PS2 mouse in guests Solution
  • Linux how to compile binary with static sharedobjects embedded instead of dynamic to use on multi-distributions and avoid glibc compatiblity issues
  • /bin/sh: msgfmt: not found error solution on Linux Compilation Ubuntu Debian Mint Centos
  • Mikrotik RouterOS CHR/ISO Basic and Quick Setup Howto Guide
  • qemu 4 compilation options
  • CentOS 7 8 PXEBoot Netinstall Not Working Solution "Pane is dead "new value non-exisetnt xfs filesystem is not valid as a default fs type"
  • CentOS 6 EOL yum repo won't work Error: Cannot find a valid baseurl for repo: base Solution
  • CentOS 7 8 How To Disable SELinux
  • Wordpress How To Add Featured Image To Post in Hueman Theme
  • kdenlive full reset how to erase all config files
  • CentOS 7 8 yum error Trying other mirror. To address this issue please refer to the below wiki article
  • Microsoft Teams Linux - Calendar Doesn't Work Missed Meetings!
  • Scanner not working in Linux Ubuntu Fedora Mint Debian over the network? Use sane-airscan!
  • How To Boot, Install and Run Windows 2000 on QEMU-KVM
  • bash cannot execute permission denied
  • Huion and Wacom Tablets How To Install in Linux Mint / Ubuntu and make the stylus work properly
  • ffmpeg how to cut certain parts of video out