[ceph-users] Cache Settings

2015-02-07 Thread Nick Fisk
Hi All, Time for a little Saturday evening Ceph related quiz. From this documentation page http://ceph.com/docs/master/rados/operations/cache-tiering/ It seems to indicate that you can either flush/evict using relative sizing (cache_target_dirty_ratio) or absolute sizing (target_max_bytes).

Re: [ceph-users] Cache Settings

2015-02-07 Thread LOPEZ Jean-Charles
Hi Nick it is correct that the ratios are relative to the size directives, target_max_bytes and target_max_objects which ever is crossed first in case they are both set. Those parameters are cache pool specific so you can create multiple cache pools, all using the same OSDs (same CRUSH rule

Re: [ceph-users] Cache Settings

2015-02-07 Thread Nick Fisk
: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Sage Weil Sent: 07 February 2015 20:57 To: Nick Fisk Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] Cache Settings On Sat, 7 Feb 2015, Nick Fisk wrote: Hi All, Time for a little Saturday evening Ceph related quiz