Thank you guys , this answers my query
Cheers Vickey On Thu, Aug 13, 2015 at 8:02 PM, Bill Sanders <[email protected]> wrote: > I think you're looking for this. > > http://ceph.com/docs/master/man/8/rbd/#cmdoption-rbd--order > > It's used when you create the RBD images. 1MB is order=20, 512 is > order=19. > > Thanks, > Bill Sanders > > > On Thu, Aug 13, 2015 at 1:31 AM, Vickey Singh <[email protected] > > wrote: > >> 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 <[email protected]> wrote: >> >>> > -----Original Message----- >>> > From: ceph-users [mailto:[email protected]] On Behalf >>> Of >>> > Dominik Zalewski >>> > Sent: 12 August 2015 14:40 >>> > To: [email protected] >>> > 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 >>> [email protected] >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >> >> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >
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