[CentOS] puzzling md error ?

John R Pierce pierce at hogranch.com
Sun Feb 28 21:03:00 UTC 2010


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




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