Thanks Nick for your suggestion. Can you also tell how i can reduce RBD block size to 512K or 1M , do i need to put something in clients ceph.conf ( what parameter i need to set )
Thanks once again - Vickey On Wed, Aug 12, 2015 at 4:49 PM, Nick Fisk <n...@fisk.me.uk> wrote: > > -----Original Message----- > > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of > > Dominik Zalewski > > Sent: 12 August 2015 14:40 > > To: ceph-us...@ceph.com > > Subject: [ceph-users] Cache tier best practices > > > > Hi, > > > > I would like to hear from people who use cache tier in Ceph about best > > practices and things I should avoid. > > > > I remember hearing that it wasn't that stable back then. Has it changed > in > > Hammer release? > > It's not so much the stability, but the performance. If your working set > will sit mostly in the cache tier and won't tend to change then you might > be alright. Otherwise you will find that performance is very poor. > > Only tip I can really give is that I have found dropping the RBD block > size down to 512kb-1MB helps quite a bit as it makes the cache more > effective and also minimises the amount of data transferred on each > promotion/flush. > > > > > Any tips and tricks are much appreciated! > > > > Thanks > > > > Dominik > > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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