[Gluster-users] Safely remove one replica

[John Gardeniers]

Hi Atin,

On 25/06/15 14:34, Atin Mukherjee wrote:
>
> On 06/25/2015 10:01 AM, John Gardeniers wrote:
>> Hi Atin,
>>
>> On 25/06/15 14:24, Atin Mukherjee wrote:
>>> On 06/25/2015 03:07 AM, John Gardeniers wrote:
>>>> No takers on this one?
>>>>
>>>> On 22/06/15 14:37, John Gardeniers wrote:
>>>>> Until last weekend we had a simple 1x2 replicated volume, consisting
>>>>> of a single brick on each peer. After a drive failure screwed the
>>>>> brick on one peer we decided to create a new peer and swap the bricks.
>>>>> Running "gluster volume replace-brick gluster-rhev
>>>>> dead_peer:/gluster_brick_1 new_peer:/gluster_brick_1 commit force".
>>> Did replace brick succeeded? Ideally if you run replace brick commit
>>> force, that can result into data loss until and unless you explicitly
>>> take care of it.
>> No, replace brick failed. Gluster wanted both the old and new servers
>> connected and refused to proceed without them.
> Why are the nodes not connected? If that's the case you should look into
> that first. Even in this situation remove brick would fail. Checking
> glusterd log files might give you some clue?

The new node was connected but the old (dead) node wasn't. No way could 
I get gluster to replace the brick. Having tight time constraints and an 
overwhelming desire to have a second node I increased the replica count 
using the new node. Now I'd like to clean things up by removing the dead 
one.

>>>>> After trying for some time and not wishing to rely on a single peer we
>>>>> added kari as an additional replica with "gluster volume add-brick
>>>>> gluster-rhev replica 3 new_peer:/gluster_brick_1 force".
>>>>>
>>>>> Can we now *safely* remove the dead brick and revert back to replica 2?
>>> If the earlier replace brick didn't happen, then you can go for
>>> remove-brick start followed by commit once the status is completed. But
>>> double check the data as well.
>> Thanks, I'll try it over a weekend.
>>
>>>>> regards,
>>>>> John
>>>>>
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>>
>>