On Wed, Feb 21, 2018 at 9:13 PM, Jeff Applewhite <japplewh@xxxxxxxxxx> 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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