[Lustre-discuss] e2fsck

[Robin Humble]

On Fri, Feb 20, 2009 at 02:10:50PM -0700, Andreas Dilger wrote:
>On Feb 19, 2009  20:42 -0500, Robin Humble wrote:
>> in 5 out of 6 e2fsck's I do after an OSS crash, I get one free blocks
>> count wrong and often a bitmap in a group that wants to be corrected.
>> 
>> is this normal?
>> or is it an ldiskfs or an e2fsck bug?
>
>Do you have the "MMP" feature enabled?

no, MMP is off.

there is a small chance that this is the first time the partitions have
been fsck'd since MMP was turned off though - I can't be sure about that.

we have MMP off because when e2fsck or tune2fs crashes (eg. out of
memory, or when tune2fs goes recursively looking for journal devices
that don't exist) then it makes the MMP'd partition unusable.

cheers,
robin


>> rhel5 x86_64
>> e2fsprogs-1.40.11.sun1-0redhat
>> kernel-lustre-smp-2.6.18-92.1.10.el5_lustre.1.6.6
>> 
>> cheers,
>> robin
>> 
>> [root at sox2 ~]# e2fsck -f /dev/md5
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> Block bitmap differences:  -107639
>> Fix<y>? yes
>> 
>> Free blocks count wrong for group #3 (19179, counted=19180).
>> Fix<y>? yes
>> 
>> Free blocks count wrong (8199819, counted=8199820).
>> Fix<y>? yes
>> 
>> 
>> system-OST0001: ***** FILE SYSTEM WAS MODIFIED *****
>> system-OST0001: 133986/3055616 files (1.2% non-contiguous),
>> 4007188/12207008 blocks
>> [root at sox2 ~]# e2fsck -f /dev/md6
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> home-OST0001: recovering journal
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> Free blocks count wrong for group #3 (23432, counted=23433).
>> Fix<y>? yes
>> 
>> Free blocks count wrong (131098913, counted=131098914).
>> Fix<y>? yes
>> 
>> 
>> home-OST0001: ***** FILE SYSTEM WAS MODIFIED *****
>> home-OST0001: 26848/33513472 files (2.4% non-contiguous),
>> 2934270/134033184 blocks
>> [root at sox2 ~]# e2fsck -f /dev/md7
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> apps-OST0001: recovering journal
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> Free blocks count wrong for group #3 (23432, counted=23433).
>> Fix<y>? yes
>> 
>> Free blocks count wrong (34865220, counted=34865221).
>> Fix<y>? yes
>> 
>> 
>> apps-OST0001: ***** FILE SYSTEM WAS MODIFIED *****
>> apps-OST0001: 45904/9166848 files (3.9% non-contiguous),
>> 1794027/36659248 blocks
>> [root at sox2 ~]#
>> [root at sox2 ~]# e2fsck -f /dev/md15
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> system-OST0000: recovering journal
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> Free blocks count wrong for group #3 (20647, counted=20648).
>> Fix<y>? yes
>> 
>> Free blocks count wrong (8115827, counted=8115828).
>> Fix<y>? yes
>> 
>> 
>> system-OST0000: ***** FILE SYSTEM WAS MODIFIED *****
>> system-OST0000: 134002/3055616 files (1.2% non-contiguous),
>> 4091180/12207008 blocks
>> [root at sox2 ~]# e2fsck -f /dev/md16
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> home-OST0000: recovering journal
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> 
>> home-OST0000: ***** FILE SYSTEM WAS MODIFIED *****
>> home-OST0000: 26831/33513472 files (2.1% non-contiguous),
>> 2951394/134033184 blocks
>> [root at sox2 ~]# e2fsck -f /dev/md17
>> e2fsck 1.40.11.sun1 (17-June-2008)
>> apps-OST0000: recovering journal
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> Free blocks count wrong for group #3 (3046, counted=3047).
>> Fix<y>? yes
>> 
>> Free blocks count wrong (34976431, counted=34976432).
>> Fix<y>? yes
>> 
>> 
>> apps-OST0000: ***** FILE SYSTEM WAS MODIFIED *****
>> apps-OST0000: 45798/9166848 files (3.7% non-contiguous),
>> 1682816/36659248 blocks
>> 
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>
>Cheers, Andreas
>--
>Andreas Dilger
>Sr. Staff Engineer, Lustre Group
>Sun Microsystems of Canada, Inc.