On 08/15/2013 10:05 PM, David Gibbons wrote:
Hi There,
I'm currently testing Gluster for possible production use. I haven't
been able to find the answer to this question in the forum arch or in
the public docs. It's possible that I don't know which keywords to
search for.
Here's the question (more details below): let's say that one of my
bricks "fails" -- /not/ a whole node failure but a single brick
failure within the node. How do I replace a single brick on a node and
force a sync from one of the replicas?
I have two nodes with 5 bricks each:
gluster> volume info test-a
Volume Name: test-a
Type: Distributed-Replicate
Volume ID: e8957773-dd36-44ae-b80a-01e22c78a8b4
Status: Started
Number of Bricks: 5 x 2 = 10
Transport-type: tcp
Bricks:
Brick1: 10.250.4.63:/localmnt/g1lv2
Brick2: 10.250.4.65:/localmnt/g2lv2
Brick3: 10.250.4.63:/localmnt/g1lv3
Brick4: 10.250.4.65:/localmnt/g2lv3
Brick5: 10.250.4.63:/localmnt/g1lv4
Brick6: 10.250.4.65:/localmnt/g2lv4
Brick7: 10.250.4.63:/localmnt/g1lv5
Brick8: 10.250.4.65:/localmnt/g2lv5
Brick9: 10.250.4.63:/localmnt/g1lv1
Brick10: 10.250.4.65:/localmnt/g2lv1
I formatted 10.250.4.65:/localmnt/g2lv5 (to simulate a "failure").
What is the next step? I have tried various combinations of removing
and re-adding the brick, replacing the brick, etc. I read in a
previous message to this list that replace-brick was for planned
changes which makes sense, so that's probably not my next step.
You must first check if the 'formatted' brick
10.250.4.65:/localmnt/g2lv5 is online using the `gluster volume status`
command. If not start the volume using `gluster volume start
<VOLNAME>force`. You can then use the gluster volume heal command which
would copy the data from the other replica brick into your formatted brick.
Hope this helps.
-Ravi
Cheers,
Dave
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