Re: Set cache tier pool forward state automatically!

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On Thu, 4 Feb 2016 21:33:10 -0700 Robert LeBlanc wrote:

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> On Thu, Feb 4, 2016 at 8:32 PM, Christian Balzer  wrote:
> > On Wed, 3 Feb 2016 22:42:32 -0700 Robert LeBlanc wrote:
> 
> > I just finished downgrading my test cluster from testing to Jessie and
> > then upgrading Ceph from Firefly to Hammer (that was fun few hours).
> >
> > And I can confirm that I don't see that issue with Hammer, wonder if
> > it's worth prodding the devs about.
> > I sorta dread the time the PG upgrade process will take when going to
> > Hammer on the overloaded production server.
> > But then again, a fix for Firefly is both unlikely and going to take
> > too long for my case anyway.
> 
> There isn't any PG upgrading as part of the Firefly to Hammer process
> that I can think of. If there is, it wasn't long. Setting noout would
> prevent backfilling so only recovery of delta changes would be needed.
> You don't have to reboot the node, just restart the process so it can
> limit the amount of changes to only a minute or two. It's been a long
> time since I did that upgrade that I just may be plain forgetting
> something.
> 
There is, it wasn't particular long on my test cluster, but that one is
tiny compared to the production one and also was under no I/O load during
the restart:
---
2016-02-05 11:51:19.763477 7fa3654cb900 -1 filestore(/var/lib/ceph/osd/ceph-20) FileStore::mount : stale version stamp detected: 3. Proceeding, do_update is set, performing disk format upgrade.
2016-02-05 11:51:20.057585 7fa3654cb900  1 filestore upgrade_to_v2 start
2016-02-05 11:51:20.097837 7fa3654cb900  1 filestore upgrade_to_v2 done
2016-02-05 11:51:21.710174 7fa3654cb900 -1 osd.20 9953 PGs are upgrading
---

In total that initial Hammer OSD startup was about twice as long that with
Firefly before and consecutive Hammer restarts, though in this case that
means just 2-3 seconds more.

Guess there's no avoiding that bullet.

Christian

> I think you are right about the fix not going into Firefly since it
> will EoL this year. Glad to know that it is fixed in Hammer.
> 
> - ----------------
> Robert LeBlanc
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-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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