Hi everyone,
We have a distributed Gluster volume on five bricks over two
servers (first server running gluster 3.4.2, second server
running gluster 3.5.1, both running Fedora 20)
Starting last week, doing a file listing on the mounted
volume shows many files with the same name appearing twice (and
they are listed with the same inode). Doing a search for these
files, I have found 290,000 of them!!
If I do a listing of these files on the bricks themselves, it
looks like most are link files (du will show the file on the
first server as 0 bytes, and the sticky bit set). The file is
fine on the second server. Unfortunately, running "getfattr -m -
-e hex -d" on the file shows NO gluster-related attributes and I
believe this is why both files appear in the listing. The files
cannot be read by any programs as it is trying to read the link
file. I assume the metadata became corrupted. This is a
production server so we really need to know:
1. How did this happen, and how can we prevent it going
forward? There was a server crash a week ago and I believe that
was the cause.
2. How can we heal the Gluster volume/bricks and link files.
If there is some straightforward way of restoring the link file
pointer I can write a script to do it, obviously doing this
manually will be impossible.
Thanks very much for any and all help - much appreciated!
Regards,
Tom
> Hi everyone, we have noticed some extremely odd
behaviour with our
> distributed Gluster volume where duplicate files (same
name, same or
> different content) are being created and stored on
multiple bricks. The only
> consistent clue is that one of the duplicate files has
the sticky bit set. I
> am hoping someone will be able to shed some light on why
this is happening
> and how we can restore the volume as there appear to be
hundreds of such
> files. I will try to provide as much pertinent
information as I can.
>
> We have a 130TB Gluster volume consisting of two 20TB
bricks on server1, and
> three 40TB bricks on a server2 which were added at a
later date (and
> rebalancing was done). The volume is mounted on server1,
and accessed only
> through this server but by many users. Both servers went
down due to power
> loss several days ago after which this problem was first
noticed. We ran a
> rebalance command on the volumes, this has not fixed the
problem.
>
>
> Gluster volume info:
> Volume Name: safari
> Type: Distribute
> Volume ID: d48d0e6b-4389-4c2c-8fd1-cd2854121eda
> Status: Started
> Number of Bricks: 5
> Transport-type: tcp
> Bricks:
> Brick1: server1:/data/glusterfs/safari/brick00/brick
> Brick2: server1:/data/glusterfs/safari/brick01/brick
> Brick3: server2:/data/glusterfs/safari/brick02/brick
> Brick4: server2:/data/glusterfs/safari/brick03/brick
> Brick5: server2:/data/glusterfs/safari/brick04/brick
>
>
> Size information:
> /dev/sdc 37T 16T 22T 42% /data/glusterfs/safari/brick02
> /dev/sdd 37T 16T 22T 42% /data/glusterfs/safari/brick03
> /dev/sde 37T 17T 21T 45% /data/glusterfs/safari/brick04
> /dev/md126 11T 7.7T 2.8T 74%
/data/glusterfs/safari/brick00
> /dev/md124 11T 8.0T 2.5T 77%
/data/glusterfs/safari/brick01
> server2:/safari 130T 63T 68T 48% /sar
>
>
> Example 1:
> -Two files with the same name exist in one directory
> -They have different contents and attributes
> -A file listing on the mounted volume shows the same
inode
> -The newer file has sticky bit set
> -Neither file is corrupted, they can both be viewed by
using the absolute
> path (on the bricks)
>
> File listing on the mounted volume
> 13036730497538635177 -rw-rw-r-T 1 jon users 924 Dec 15
10:42 RSLC_tab
> 13036730497538635177 -rw-rw-r-- 1 jon users 418 Mar 18
2013 RSLC_tab
>
> Listing of the files on the bricks:
> 8925798411 -rw-rw-r-T+ 2 jon users 924 Dec 15 10:42
>
/data/glusterfs/safari/brick00/brick/complete/shm/rs2/ottawa/mf6_asc/stack_org/RSLC_tab
> 51541886672 -rw-rw-r--+ 2 1002 users 418 Mar 18 2013
>
/data/glusterfs/safari/brick02/brick/complete/shm/rs2/ottawa/mf6_asc/stack_org/RSLC_tab
>
>
> Example 2:
> -Two files with the same name exist in one directory
> -They have the same content and attributes
> -No sticky bit is set when looking at file listing on the
mounted volume
> -Sticky bit is set for one while when looking at file
listing on the bricks
> -Files are corrupted
>
> File listing on the mounted volume:
> 13012555852904096080 -rw-rw-r-- 1 tom users 2393848 Dec 8
2013
> ifg_lr/20130226_20130813.diff.phi.ras
> 13012555852904096080 -rw-rw-r-- 1 tom users 2393848 Dec 8
2013
> ifg_lr/20130226_20130813.diff.phi.ras
>
> Listing of the files on the bricks:
> 17058578 -rw-rw-r-T+ 2 tom users 2393848 Dec 13 17:11
>
/data/glusterfs/safari/brick00/brick/rsc/rs2/calgary/u22_dsc/stack_org/ifg_lr/20130226_20130813.diff.phi.ras
> 57986922129 -rw-rw-r--+ 2 1010 users 2393848 Dec 8 2013
>
/data/glusterfs/safari/brick02/brick/rsc/rs2/calgary/u22_dsc/stack_org/ifg_lr/20130226_20130813.diff.phi.ras
>
>
> Additionally, only some files in this directory are
duplicated. The
> duplicated files are corrupted (can not be viewed as
Raster images: the
> original file type)
> The files which are not duplicated are not corrupted.
>
> File command: (notice duplicate and singleton files)
> ifg_lr/20091021_20100218.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
> ifg_lr/20091021_20101016.diff.phi.ras: data
> ifg_lr/20091021_20101016.diff.phi.ras: data
> ifg_lr/20091021_20101109.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
> ifg_lr/20091021_20101203.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
> ifg_lr/20091021_20101227.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
> ifg_lr/20091021_20110120.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
> ifg_lr/20091021_20110213.diff.phi.ras: data
> ifg_lr/20091021_20110213.diff.phi.ras: data
> ifg_lr/20091021_20110309.diff.phi.ras: data
> ifg_lr/20091021_20110309.diff.phi.ras: sticky data
> ifg_lr/20091021_20110402.diff.phi.ras: Sun raster image
data, 1208 x 1981,
> 8-bit, RGB colormap
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