Thank you very much!
On Monday 28 April 2014 07:41 AM, Ravishankar N wrote:
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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