[DRBD-user] DRBD - Remounting filesystem read-only

[Lars Ellenberg]

/ 2006-10-20 11:46:22 -0200
\ Fábio J. Bonatto:
> Please, i have DRBD desactivate in my server...But yesterday
> i had a problem.... my /home directory was mounted in read-only...
> 
> 
> /dev/drbd2            220G  1,1G  207G   1% /home --> EXT3
> 
> My DRBD Version::: Centos 4.3
> drbd-0.7.21-1.c4
> and
> kernel-module-drbd-2.6.9-42.0.3.ELsmp-0.7.21-1.c4
> 
> Oct 19 23:24:08 firewall kernel: attempt to access beyond end of device
> Oct 19 23:24:08 firewall kernel: drbd2: rw=0, want=466616336, limit=466554560
> Oct 19 23:24:08 firewall kernel: EXT3-fs error (device drbd2): read_inode_bitmap: Cannot read inode bitmap - block_group = 17
> 80, inode_bitmap = 58327041
> Oct 19 23:24:08 firewall kernel: Aborting journal on device drbd2.
> Oct 19 23:24:08 firewall kernel: EXT3-fs error (device drbd2) in ext3_new_inode: IO failure
> Oct 19 23:24:08 firewall kernel: EXT3-fs error (device drbd2) in ext3_create: IO failure
> Oct 19 23:24:13 firewall kernel: ext3_abort called.
> Oct 19 23:24:13 firewall kernel: EXT3-fs error (device drbd2): ext3_journal_start_sb: Detected aborted journal
> Oct 19 23:24:13 firewall kernel: Remounting filesystem read-only
> 
> Now i Re-mounted... it´s ok.
> 
> Any knows what it happened?

#!/bin/bash
  drbd=drbd2
  read _ _ c _ _ s < <(
  	tune2fs -l /dev/$drbd |
  	grep -E "^Block (size|count)" |
  	 tee /dev/stderr | tr '\n' ' ');
  es=$[c*s>>10];
  echo "ext3: thinks it is $es kB (== $c * $s /1024)";
  
  read _ _ ds _ < <(grep -w $drbd /proc/partitions);
  echo "$drbd thinks it is $ds kB (from /proc/partitions)";
  [[ $es == $ds ]] || echo "you got a problem ..."
# ---

if you "got a problem", maybe you did mkfs on /dev/whatever instead of
/dev/drbd2, and you are using 'internal' meta data, and you did not
shrink the file system before using it with drbd...

-- 
: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
: Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :
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