Re: [SPAM] Changing pg_num => RBD VM down !

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I had the same issue a few days ago. I was increasing the pg_num of one
pool from 512 to 1024 and all the VMs in that pool stopped. I came to
the conclusion that doubling the pg_num caused such a high load in ceph
that the VMs were blocked. The next time I will test with small
increments.


On 12:38 Sat 14 Mar     , Florent B wrote:
> Hi all,
> 
> I have a Giant cluster in production.
> 
> Today one of my RBD pools had the "too few pgs" warning. So I changed
> pg_num & pgp_num.
> 
> And at this moment, some of the VM stored on this pool were stopped (on
> some hosts, not all, it depends, no logic)
> 
> All was running fine for months...
> 
> Have you ever seen this ?
> What could have caused this ?
> 
> Thank you.
> 
> 
> _______________________________________________
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> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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