[CentOS] puzzling md error ?

Eero Volotinen eero.volotinen at iki.fi
Sun Feb 28 21:15:09 UTC 2010


2010/2/28 John R Pierce <pierce at hogranch.com>:
> this has never happened to me before, and I'm somewhat at a loss.  got a
> email from the cron thing...
>
>    /etc/cron.weekly/99-raid-check:
>
>    WARNING: mismatch_cnt is not 0 on /dev/md10
>    WARNING: mismatch_cnt is not 0 on /dev/md11
>
>
> ok, md10 and md11 are each raid1's made from 2 x 72GB scsi drives, on a
> dell 2850 or something dual single-core 3ghz server.
>
> these two md's are in turn a striped LVM volume group
>
> dmesg shows....
>
>    md: syncing RAID array md10
>    md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
>    md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
>    md: using 128k window, over a total of 143374656 blocks.
>    md: syncing RAID array md11
>    md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
>    md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
>    md: using 128k window, over a total of 143374656 blocks.
>    md: md10: sync done.
>    RAID1 conf printout:
>     --- wd:2 rd:2
>     disk 0, wo:0, o:1, dev:sdc1
>     disk 1, wo:0, o:1, dev:sdd1
>    md: md11: sync done.
>    RAID1 conf printout:
>     --- wd:2 rd:2
>     disk 0, wo:0, o:1, dev:sde1
>     disk 1, wo:0, o:1, dev:sdf1
>
> I'm not sure what thats telling me.  the last thing prior to this in
> dmesg was when I added a swap to this vg last week.
>
>
> and mdadm --detail shows...
>
> # mdadm --detail /dev/md10
> /dev/md10:
>        Version : 0.90
>  Creation Time : Wed Oct  8 12:54:48 2008
>     Raid Level : raid1
>     Array Size : 143374656 (136.73 GiB 146.82 GB)
>  Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
>   Raid Devices : 2
>  Total Devices : 2
> Preferred Minor : 10
>    Persistence : Superblock is persistent
>
>    Update Time : Sun Feb 28 04:53:29 2010
>          State : clean
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>  Spare Devices : 0
>
>           UUID : b6da4dc5:c7372d6e:63f32b9c:49fa95f9
>         Events : 0.84
>
>    Number   Major   Minor   RaidDevice State
>       0       8       33        0      active sync   /dev/sdc1
>       1       8       49        1      active sync   /dev/sdd1
> # mdadm --detail /dev/md11
> /dev/md11:
>        Version : 0.90
>  Creation Time : Wed Oct  8 12:54:57 2008
>     Raid Level : raid1
>     Array Size : 143374656 (136.73 GiB 146.82 GB)
>  Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
>   Raid Devices : 2
>  Total Devices : 2
> Preferred Minor : 11
>    Persistence : Superblock is persistent
>
>    Update Time : Sun Feb 28 11:49:45 2010
>          State : clean
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>  Spare Devices : 0
>
>           UUID : be475cd9:b98ee3ff:d18e668c:a5a6e06b
>         Events : 0.62
>
>    Number   Major   Minor   RaidDevice State
>       0       8       65        0      active sync   /dev/sde1
>       1       8       81        1      active sync   /dev/sdf1
>
>
>
> I don't see anything wrong here ?
>
> lvm shows no problems I detect either...
>
> # vgdisplay vg1
>  Volume group "vgdisplay" not found
>  LV             VG   Attr   LSize  Origin Snap%  Move Log Copy%  Convert
>  glassfish      vg1  -wi-ao 10.00G
>  lv1            vg1  -wi-ao 97.66G
>  oradata        vg1  -wi-ao 30.00G
>  pgdata         vg1  -wi-ao 25.00G
>  pgdata_lss_idx vg1  -wi-ao 20.00G
>  pgdata_lss_tab vg1  -wi-ao 20.00G
>  swapper        vg1  -wi-ao  3.00G
>  vmware         vg1  -wi-ao 50.00G
>
>
> # pvdisplay /dev/md10 /dev/md11
>  --- Physical volume ---
>  PV Name               /dev/md10
>  VG Name               vg1
>  PV Size               136.73 GB / not usable 2.31 MB
>  Allocatable           yes
>  PE Size (KByte)       4096
>  Total PE              35003
>  Free PE               1998
>  Allocated PE          33005
>  PV UUID               oAgJY7-Tmf7-ac35-KoUH-15uz-Q5Ae-bmFCys
>
>  --- Physical volume ---
>  PV Name               /dev/md11
>  VG Name               vg1
>  PV Size               136.73 GB / not usable 2.31 MB
>  Allocatable           yes
>  PE Size (KByte)       4096
>  Total PE              35003
>  Free PE               2560
>  Allocated PE          32443
>  PV UUID               A4Qb3P-j5Lr-8ZEv-FjbC-Iczm-QkC8-bqP0zv

maybe this helps: http://www.arrfab.net/blog/?p=199

--
Eero


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