[openstack-dev] [tc] [all] OpenStack moving both too fast and too slow at the same time

Sean McGinnis sean.mcginnis at gmx.com
Fri May 5 21:37:30 UTC 2017

On Fri, May 05, 2017 at 04:17:29PM -0400, Jonathan Proulx wrote:
> On Fri, May 05, 2017 at 02:04:43PM -0600, John Griffith wrote:
> :On Fri, May 5, 2017 at 11:24 AM, Chris Friesen <chris.friesen at windriver.com>
> :> Cinder theoretically supports LVM/iSCSI, but if you actually try to use it
> :> for anything stressful it falls over.
> :>
> :
> :​Oh really?​
> :
> :​I'd love some detail on this.  What falls over?
> I'm a bit out of date on this personally, but we ditched all iSCSI a
> few years ago becasue we found it generally flaky on Linux. We we were
> motly using Equallogic SAN both for OpenStack and stand alone servers
> but saw same issues with some other targets as well.
> So I wonder if this is a Cinder issue or just a Linux issue.
> What we saw fall over was any slight network bump would permanently
> drop conenct to backing storage requiring reset.  But as I say this
> was decidedly not a Cinder issue.
> -Jon

Yeah, Cinder doesn't get in the data path, so it wouldn't be Cinder itself.

LVM will configure the iSCSI target, but then that is all in the Linux and
distro package realm.

Same for iSCSI initiator. But since we have a lot of external storage,
besides LVM, that uses the Linux iSCSI initiator, that makes me want to
point fingers at it being an environment issue with the network or something
interfering with the traffic.

At any rate, if you do see issues with the way Cinder is configuring any of
that, please do let us know.

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