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On 04/28/2014 01:30 AM, Chalcogen
wrote:
Hi everyone,
I have trouble understanding the following behavior:
Suppose I have a replica 2 volume 'testvol' on two servers,
server1 and server2, composed of server1:/bricks/testvol/brick
and server2:/bricks/testvol/brick. Also, suppose it contains a
good number of files.
Now, assume I remove one of the two bricks, as:
root@server1~# gluster volume remove-brick testvol replica 1
server1:/bricks/testvol/brick
Now, I unmount and delete the logical volume supporting the
brick and then recreate it (with a different size), and mount it
the same way as it was mounted before (at /brick/testvol/).
Then, I re-add it as:
root@server1~# gluster volume add-brick testvol replica 2
server1:/bricks/testvol/brick
I observe that the brick on server1 does not contain any of the
data that was in the volume.
root@server1~# ls /bricks/testvol/brick
root@server1~#
This is all right by me, since glusterfs
needs some time to discover and sync files that are absent on
the brick of server1. In fact, if I leave the setup undisturbed
for 15 minutes to half an hour, I find that all data appears
within the brick of server1, just as you would expect. Also, if
I wish to speed up the process, I simply do a ls -Ra on the
directory where the volume is mounted, and all files sync onto
server1's brick. This is also very much as expected.
However, during the period where data on server1's brick is not
available, if you query the heal info for the volume, gluster
cli reports that 'Number of entries' is '0', and that too all of
'info', 'heal-failed', and 'split-brain'. This is what becomes a
bit of a trouble for me. Fact is, we are attempting to automate
the monitoring of our glusterfs volumes, and we depend upon heal
info alone to decide whether data on server1 and server2 are in
sync.
Could somebody, therefore, help me with the following questions?
a) Which files exactly show up in heal info?
The files which are healed either by the
self-heal daemon or by the gluster heal commands.
b) What exactly should I look to monitor if we
are to ascertain that data on our servers are in sync?
After adding a new replica brick, you need to
run a full heal (gluster volume heal <vol-name> full). Then
the results will show up in the heal info output.
Thanks a lot for your responses!
Anirban
P.s. I am using glusterfs 3.4.2 over linux kernel version
2.6.34.
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