Re: mdadm: making a spare actie

[Jon Buckingham <jbuckingham@blueyonder.co.uk>]

[-- Attachment #1: Type: text/plain, Size: 1792 bytes --]

Neil Brown wrote:
> On Thursday June 19, jbuckingham@blueyonder.co.uk wrote:
>> I have also done
>> mdadm /dev/md0 -a /dev/sdb5
>> and this results in a recovery...
>>
>> nas:~ # cat /proc/mdstat
>> Personalities : [raid6] [raid5] [raid4]
>> md0 : active raid5 sdb5[4] sda5[0] sdd5[3] sdc5[2]
>>        733142016 blocks level 5, 64k chunk, algorithm 2 [4/3] [U_UU]
>>        [=>...................]  recovery =  7.3% (17900780/244380672) finish=174.1min speed=21666K/sec
>>
>> unused devices: <none>
>>
>> Which I've been through before, but still ends up as a spare.
> 
> That suggests that it hits some IO error during recovery and aborts.
> 
> Are there any kernel log messages during the time that it is
> recovering?
> 
> NeilBrown
> 
> 
No.
After the "add" completed, and a reboot it seems it is still a
"spare".
Strange.

Then from dmesg:

device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel@redhat.com
md: md0 stopped.
md: bind<sdc5>
md: bind<sdd5>
md: bind<sdb5>
md: bind<sda5>
md: kicking non-fresh sdb5 from array!
md: unbind<sdb5>
md: export_rdev(sdb5)
raid5: automatically using best checksumming function: pIII_sse
    pIII_sse  :  5640.000 MB/sec
raid5: using function: pIII_sse (5640.000 MB/sec)

raid5: device sda5 operational as raid disk 0
raid5: device sdd5 operational as raid disk 3
raid5: device sdc5 operational as raid disk 2
raid5: allocated 4204kB for md0
raid5: raid level 5 set md0 active with 3 out of 4 devices, algorithm 2
RAID5 conf printout:
  --- rd:4 wd:3
  disk 0, o:1, dev:sda5
  disk 2, o:1, dev:sdc5
  disk 3, o:1, dev:sdd5

I am tempted to rebuild the whole thing now, since I have tried
quite a few variations and not solved it. There must be some deeper rooted problem that
is causing this issue on the disk.

Thanks again,

Jon B

[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/x-pkcs7-signature, Size: 3281 bytes --]