[Gluster-devel] 2 way with Arbiter degraded behavior

[Manoj Pillai]

On Wed, Feb 21, 2018 at 9:13 PM, Jeff Applewhite <japplewh at redhat.com>
wrote:

> Hi All
>
> When you have a setup with 2 way replication + Arbiter backed by two
> large RAID 6 volumes what happens when there is a disk failure and
> rebuild in progress in one of those RAID sets from a client
> perspective?
>
> Does the FUSE client know how to prioritize the quicker disk (the RAID
> set that is not in rebuild)?  If not could it be made smart in this
> way? I ask because with large disks, rebuild priority could be set to
> very fast on the controller card if Gluster can auto detect or in some
> way work around the relatively slow performance from one of two
> backends. The likelihood of having rebuilds in progress on two
> different raid sets on two different servers is very low.
>
> Another way to state this is "is there some advantage we can gain from
> having double replication (RAID 6 + Gluster file replication)?"
>
> Thanks,
>
>
> Jeff Applewhite
>

I opened an issue sometime back  with this and some other scenarios in
mind:  https://github.com/gluster/glusterfs/issues/363.

-- Manoj

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