[Bugs] [Bug 1375431] [RFE] enable sharding and strict-o-direct with virt profile - /var/lib/glusterd /groups/virt

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1375431

Krutika Dhananjay <kdhananj at redhat.com> changed:

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--- Comment #7 from Krutika Dhananjay <kdhananj at redhat.com> ---
(In reply to Pranith Kumar K from comment #6)
> (In reply to Krutika Dhananjay from comment #5)
> > (In reply to Pranith Kumar K from comment #4)
> > > (In reply to Krutika Dhananjay from comment #3)
> > > > (In reply to SATHEESARAN from comment #1)
> > > > > strict-o-direct also needs to be turned on and remote-dio to be turned off
> > > > > 
> > > > > In total there are 4 options :
> > > > > 
> > > > > features.shard=on
> > > > > cluster.data-self-heal-algorithm=full
> > > > > performance.strict-o-direct=on
> > > > > network.remote-dio=disable
> > > > 
> > > > Just for the record, the option features.shard=on and
> > > > cluster.data-self-heal-algorithm=full will be added to group virt. O-DIRECT
> > > > options will be skipped since not all users might want to use cache=none
> > > > qemu option, and so it is best to configure them separately.
> > > > -Krutika
> > > 
> > > odirect options honour the o-direct flag for open. Does qemu always open
> > > with o-direct even when cache is not set as 'none'?
> > 
> > When cache=none is not used, I believe qemu won't be passing O_DIRECT flag.
> > Now that I remember, there was one more reason Vijay mentioned about a
> > certain ping-timeout issue, which if fixed, we won't need to rely on any of
> > the odirect option (even if cache=none is used by qemu).
> > 
> > -Krutika
> 
> Okay, so what is the plan for the deployments? Are we going to suggest users
> to apply virt-profile and explicitly set remote-dio to off in every
> deployment, considering that cache=none is used by default?

cache=none is used by default? Isn't that a very specific case and confined to
ovirt users alone?

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