Re: rebalance near full osd

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Hello,

On Tue, 12 Apr 2016 09:46:55 +0100 (BST) Andrei Mikhailovsky wrote:

> I've done the ceph osd reweight-by-utilization and it seems to have
> solved the issue. However, not sure if this will be the long term
> solution.
>
No.
As I said in my reply, use "crush reweight" to permanently adjust weights.
reweight-by-utilization is a band-aid and not permanent, see:
http://cephnotes.ksperis.com/blog/2014/12/23/difference-between-ceph-osd-reweight-and-ceph-osd-crush-reweight

More OSDs may or may not result in a better uniformity, the 30% difference
you're seeing is definitely at the far end of what one would expect with
Ceph.

Christian

> Thanks for your help
> 
> Andrei
> 
> ----- Original Message -----
> > From: "Shinobu Kinjo" <shinobu.kj@xxxxxxxxx>
> > To: "Andrei Mikhailovsky" <andrei@xxxxxxxxxx>
> > Cc: "Christian Balzer" <chibi@xxxxxxx>, "ceph-users"
> > <ceph-users@xxxxxxxxxxxxxx> Sent: Friday, 8 April, 2016 01:35:18
> > Subject: Re:  rebalance near full osd
> 
> > There was a discussion before regarding to the situation where you are
> > facing now. [1]
> > Would you have a look, if it's helpful or not for you.
> > 
> > [1]
> > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-February/007622.html
> > 
> > Cheers,
> > Shinobu
> 


-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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