Gluster users - Mar 2017 - Proposal to deprecate replace-brick for "distribute only" volumes

Hi,

In the last few releases, we have changed replace-brick command such
that it can be called only with "commit force" option. When invoked,
this is what happens to the volume:

a. distribute only volume: the given brick is replaced with a empty
brick with 100% probability of data loss.
b. distribute-replicate: the given brick is replaced with a empty
brick and self heal is triggered. If admin is wise enough to monitor
self heal status before another replace-brick command, data is safe.
c. distribute-disperse: same as above in distribute-replicate

My proposal is to fully deprecate replace-brick command for
"distribute only" volumes. It should print out a error "The right
way
to replace brick for distribute only volume is to add brick, wait for
rebalance to complete and remove brick" and return a "-1".

Thoughts?

Thanks,
Raghavendra Talur

Makes sense.

On Thu, 16 Mar 2017 at 06:51, Raghavendra Talur <rtalur at redhat.com>
wrote:
> Hi,
>
> In the last few releases, we have changed replace-brick command such
> that it can be called only with "commit force" option. When
invoked,
> this is what happens to the volume:
>
> a. distribute only volume: the given brick is replaced with a empty
> brick with 100% probability of data loss.
> b. distribute-replicate: the given brick is replaced with a empty
> brick and self heal is triggered. If admin is wise enough to monitor
> self heal status before another replace-brick command, data is safe.
> c. distribute-disperse: same as above in distribute-replicate
>
> My proposal is to fully deprecate replace-brick command for
> "distribute only" volumes. It should print out a error "The
right way
> to replace brick for distribute only volume is to add brick, wait for
> rebalance to complete and remove brick" and return a "-1".
>
> Thoughts?
>
> Thanks,
> Raghavendra Talur
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>
-- 
--Atin
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.gluster.org/pipermail/gluster-users/attachments/20170316/719d8426/attachment.html>