Gluster users - Mar 2015 - Need advice: GlusterFS replicated on arrays with different speed!!!

Hi,

Please I need some advice.

We have two iSCSI disk arrays, the first with 16 (2.5") disks, 600Go SAS
10K each, the second 5 (3.5") disks, 4To SATA 7200 each.

is it wise to configure GlusterFS replicated volumes upon arrays with
different speed?

Thanks in advance.
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----- Original Message -----
> From: "wodel youchi" <wodel.youchi at gmail.com>
> To: "gluster-users" <gluster-users at gluster.org>
> Sent: Thursday, March 12, 2015 6:15:20 PM
> Subject: [Gluster-users] Need advice: GlusterFS replicated on arrays with
different speed!!!
> 
> Hi,
> 
> Please I need some advice.
> 
> We have two iSCSI disk arrays, the first with 16 (2.5") disks, 600Go
SAS 10K
> each, the second 5 (3.5") disks, 4To SATA 7200 each.
> 
> is it wise to configure GlusterFS replicated volumes upon arrays with
> different speed?
I would try to match similar speed drives in replicated pairs.  When you create
the volume do something like:

gluster v create testvol transport tcp replica 2 node1:/fast node2:/fast
node3:/slow node4:/slow

I can't think of anything functionally that would cause a problem, you would
only write as fast as your slowest brick in the pair though.  I see something
similar when a disk in my RAID goes bad and starts running in degraded mode. 
Things work you are just limited to the speed of the slowest brick in the
replicated pair.

-b
 
> Thanks in advance.
> 
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