[Gluster-users] Shard Volume testing (3.7.5)

[Anuradha Talur]

----- Original Message -----
> From: "Lindsay Mathieson" <lindsay.mathieson at gmail.com>
> To: "Krutika Dhananjay" <kdhananj at redhat.com>
> Cc: "gluster-users" <gluster-users at gluster.org>
> Sent: Wednesday, October 28, 2015 1:08:33 PM
> Subject: Re: [Gluster-users] Shard Volume testing (3.7.5)
> 
> 
> On 28 October 2015 at 17:03, Krutika Dhananjay < kdhananj at redhat.com > wrote:
> 
> 
> 
> So sharding also helps with better disk utilization in distributed-replicated
> volumes for large files (like VM images).
> ..
> 
> There are other long-term benefits one could reap from using sharding: for
> instance, for someone who might want to use tiering in VM store use-case,
> having sharding will be beneficial in terms of only migrating the shards
> between hot and cold tiers, as opposed to moving large files in full, even
> if only a small portion of the file is changed/accessed. :)
> 
> 
> Interesting points, thanks.
> 
> 
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> 
> Yes. So Paul Cuzner and Satheesaran who have been testing sharding here have
> reported better write performance with 512M shards. I'd be interested to
> know what you feel about performance with relatively larger shards (think
> 512M).
> 
> Seq Read speeds basically tripled, and seq writes improved to the limit of
> the network connection.
> 
> OK. And what about the data heal performance with 512M shards? Satisfactory?
> 
> 
> Easily satisfactory, a bit slower than the 4MB shard but still way faster
> than a full multi GB file heal :)
> 
> 
> Something I have noticed, is that the heal info (gluster volume heal
> <datastore> info) can be very slow to return, as in many 10's of seconds -
> is there a way to speed that up?
> 
Yes, there is a way to speed it up. Basically the process of finding out
whether a file needs heal or not takes some time, leading to slow heal info.
This decision making can be done in a faster way. I'm working on the approach
and will send a patch in the coming days.
> It would be every useful if there was a command that quickly gave
> summary/progress status, e.g "There are <X> shards to be healed"
> 
> 
> --
> Lindsay
> 
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-- 
Thanks,
Anuradha.