[dm-devel] Q: md-RAID1 creation with I/O error (attempt to access beyond end of device)

[Ulrich Windl]

Hi,

not an iSCSI question, but maybe here's the right audience: I had sucessfully created a RAID1 using mdadm, multipath, iSCSI and some SAN storage on SLES10 SP3+Updates on x86_64. When I tried to do the same thing on a comparable machine, the RAID could not be created, because something tried to access the disk at a bad position. I reapeated the attempt with another set of disks of the same size, and it also failed.

Details:
# mdadm --verbose --create /dev/md5 --raid-devices=2 --level=raid1 --bitmap=internal --assume-clean /dev/mapper/EVA1_L232_host05 /dev/mapper/EVA2_L232_host05
mdadm: /dev/mapper/EVA1_L232_host05 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Thu Oct 21 12:26:18 2010
mdadm: /dev/mapper/EVA2_L232_host05 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Thu Oct 21 12:26:18 2010
mdadm: size set to 31457216K
Continue creating array? y
mdadm: RUN_ARRAY failed: Input/output error
mdadm: stopped /dev/md5
hostname:~ # tail -24 /var/log/messages                                         Oct 21 12:28:05 hostname kernel: md: md5 stopped.
Oct 21 12:28:07 hostname kernel: md: md5 stopped.
Oct 21 12:29:46 hostname kernel: md: bind<dm-21>
Oct 21 12:29:46 hostname kernel: md: bind<dm-14>
Oct 21 12:29:46 hostname kernel: raid1: raid set md5 active with 2 out of 2 mirrors
Oct 21 12:29:46 hostname kernel: md5: bitmap file is out of date (0 < 1) -- forcing full recovery
Oct 21 12:29:46 hostname kernel: md5: bitmap file is out of date, doing full recovery
Oct 21 12:29:46 hostname kernel: attempt to access beyond end of device
Oct 21 12:29:46 hostname kernel: dm-14: rw=8, want=62914568, limit=62914560
Oct 21 12:29:46 hostname kernel: attempt to access beyond end of device
Oct 21 12:29:46 hostname kernel: dm-21: rw=8, want=62914568, limit=62914560
Oct 21 12:29:46 hostname kernel: md5: bitmap initialized from disk: read 15/16 pages, set 489472 bits, status: -5
Oct 21 12:29:46 hostname kernel: md5: failed to create bitmap (-5)
Oct 21 12:29:46 hostname kernel: md: pers->run() failed ...
Oct 21 12:29:46 hostname kernel: md: md5 stopped.
Oct 21 12:29:46 hostname kernel: md: unbind<dm-14>
Oct 21 12:29:46 hostname kernel: md: export_rdev(dm-14)
Oct 21 12:29:46 hostname kernel: md: unbind<dm-21>
Oct 21 12:29:46 hostname kernel: md: export_rdev(dm-21)

hostname:~ # mdadm --query -X /dev/mapper/EVA2_L232_host05
mdadm: WARNING: bitmap file is not large enough for array size 62914432!

        Filename : /dev/mapper/EVA2_L232_host05
           Magic : 6d746962
         Version : 4
            UUID : c522ab5a:24f292a0:0b3d7356:64ade12a
          Events : 0
  Events Cleared : 0
           State : Out of date
       Chunksize : 64 KB
          Daemon : 5s flush period
      Write Mode : Normal
       Sync Size : 31457216 (30.00 GiB 32.21 GB)
          Bitmap : 489472 bits (chunks), 489472 dirty (100.0%)
hostname:~ # mdadm --query -X /dev/mapper/EVA1_L232_host05
mdadm: WARNING: bitmap file is not large enough for array size 62914432!

        Filename : /dev/mapper/EVA1_L232_host05
           Magic : 6d746962
         Version : 4
            UUID : c522ab5a:24f292a0:0b3d7356:64ade12a
          Events : 0
  Events Cleared : 0
           State : Out of date
       Chunksize : 64 KB
          Daemon : 5s flush period
      Write Mode : Normal
       Sync Size : 31457216 (30.00 GiB 32.21 GB)
          Bitmap : 489472 bits (chunks), 489472 dirty (100.0%)

"blockdev --getsize" reports "62914560" for each LUN being used.

Regards,
Ulrich