Hello from the future!
Today I was doing a replace-brick and found that the docs are still out of date. Then I found this very relevant thread of mine from four years ago. Now I've successfully replaced a brick on a distribute-replicate volume (with no manual shenanigans like killing bricks, setting xattrs, etc). I have sent a pull request to update Gluster Docs: https://github.com/gluster/glusterdocs/pull/782
Cheers!
On Wed, Jun 12, 2019 at 2:00 PM Ravishankar N <ravishankar@xxxxxxxxxx> wrote:
On 12/06/19 1:38 PM, Alan Orth wrote:
Yes, right now, heal info showing no files is the indication. A new command for pending heal time estimation is something that is being worked upon. See https://github.com/gluster/glusterfs/issues/643Dear Ravi,
Thanks for the confirmation—I replaced a brick in a volume last night and by the morning I see that Gluster has replicated data there, though I don't have any indication of its progress. The `gluster v heal volume info` and `gluster v heal volume info split-brain` are all looking good so I guess that's enough of an indication.
One question, though. Immediately after I replaced the brick I checked `gluster v status volume` and I saw the following:
Task Status of Volume volume
------------------------------------------------------------------------------
Task : Rebalance
ID : a890e99c-5715-4bc1-80ee-c28490612135
Status : not started
I did not initiate a rebalance, so it's strange to see it there. Is Gluster hinting that I should start a rebalance? If a rebalance is "not started" shouldn't Gluster just not show it at all?
`replace-brick` should not show rebalance status. Not sure why you're seeing it. Adding Nithya for help.
Regarding the patch to the documentation: absolutely! Let me just get my Gluster back in order after my confusing upgrade last month. :PGreat. Please send the PR for the https://github.com/gluster/glusterdocs/ project. I think docs/Administrator Guide/Managing Volumes.md is the file that needs to be updated.
-Ravi
Thanks,
On Tue, Jun 11, 2019 at 7:32 PM Ravishankar N <ravishankar@xxxxxxxxxx> wrote:
On 11/06/19 9:11 PM, Alan Orth wrote:
No, all these very steps are 'codified' into the `replace brick commit force` command via https://review.gluster.org/#/c/glusterfs/+/10076/ and https://review.gluster.org/#/c/glusterfs/+/10448/. You can see the commit messages of these 2 patches for more details.Dear list,
In a recent discussion on this list Ravi suggested that the documentation for replace-brick¹ was out of date. For a distribute–replicate volume the documentation currently says that we need to kill the old brick's PID, create a temporary empty directory on the FUSE mount, check the xattrs, replace-brick with commit force.
Is all this still necessary? I'm running Gluster 5.6 on CentOS 7 with a distribute–replicate volume.
You can play around with most of these commands in a 1 node setup if you want to convince yourself that they work. There is no need to form a cluster.
[root@tuxpad glusterfs]# gluster v create testvol replica 3 127.0.0.2:/home/ravi/bricks/brick{1..3} force
[root@tuxpad glusterfs]# gluster v start testvol
[root@tuxpad glusterfs]# mount -t glusterfs 127.0.0.2:testvol /mnt/fuse_mnt/
[root@tuxpad glusterfs]# touch /mnt/fuse_mnt/FILE
[root@tuxpad glusterfs]# ll /home/ravi/bricks/brick*/FILE
-rw-r--r--. 2 root root 0 Jun 11 21:55 /home/ravi/bricks/brick1/FILE
-rw-r--r--. 2 root root 0 Jun 11 21:55 /home/ravi/bricks/brick2/FILE
-rw-r--r--. 2 root root 0 Jun 11 21:55 /home/ravi/bricks/brick3/FILE
[root@tuxpad glusterfs]# gluster v replace-brick testvol 127.0.0.2:/home/ravi/bricks/brick3 127.0.0.2:/home/ravi/bricks/brick3_new commit force
volume replace-brick: success: replace-brick commit force operation successful
[root@tuxpad glusterfs]# ll /home/ravi/bricks/brick3_new/FILE
-rw-r--r--. 2 root root 0 Jun 11 21:55 /home/ravi/bricks/brick3_new/FILE
Why don't you send a patch to update the doc for replace-brick? I'd be happy to review it. ;-)
HTH,
Ravi
Thank you,
¹ https://docs.gluster.org/en/latest/Administrator Guide/Managing Volumes/
--
Alan Orth
alan.orth@xxxxxxxxx
https://picturingjordan.com
https://englishbulgaria.net
https://mjanja.ch
"In heaven all the interesting people are missing." ―Friedrich Nietzsche
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Alan Orth
alan.orth@xxxxxxxxx
https://picturingjordan.com
https://englishbulgaria.net
https://mjanja.ch
"In heaven all the interesting people are missing." ―Friedrich Nietzsche
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