[Gluster-users] Max recommended brick size of 100 TB

[Niels de Vos]

On Fri, Feb 06, 2015 at 05:06:38PM +0000, ML mail wrote:
> Hello,
> 
> I read in the Gluster Getting Started leaflet
> (https://lists.gnu.org/archive/html/gluster-devel/2014-01/pdf3IS0tQgBE0.pdf)
> that the max recommended brick size should be 100 TB.
> 
> Once my storage server nodes filled up with disks they will have in
> total 192 TB of storage space, does this mean I should create two
> bricks per storage server node?
> 
> Note here that these two bricks would still be on the same controller
> so I don't really see the point or advantage of having two 100 TB
> bricks instead of one single brick of 200 TB per node. But maybe
> someone can explain the rational here?

This is based on the recommendation that RHEL has for maximum size of
XFS filesystems. They might have adjusted the size with more  recent
releases, though.

However, having multiple bricks per server can help with other things
too. Multiple processes (one per brick) could handle more clients at the
same time. Depending on how you configure your RAID for the bricks, you
could possibly reduce the performance loss while a RAID-set gets rebuild
after a disk loss.

Best practise seems to be to use 12 disks per RAID-set, mostly RAID10 or
RAID6 is advised.

HTH,
Niels
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