Hi Mark, Yes my reads are consistently slower. I have testes both Random and Sequential and various block sizes. Thanks Pankaj -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Mark Nelson Sent: Monday, March 30, 2015 1:07 PM To: ceph-users@xxxxxxxxxxxxxx Subject: Re: SSD Journaling On 03/30/2015 03:01 PM, Garg, Pankaj wrote: > Hi, > > I'm benchmarking my small cluster with HDDs vs HDDs with SSD Journaling. > I am using both RADOS bench and Block device (using fio) for testing. > > I am seeing significant Write performance improvements, as expected. I > am however seeing the Reads coming out a bit slower on the SSD > Journaling side. They are not terribly different, but sometimes 10% slower. > > Is that something other folks have also seen, or do I need some > settings to be tuned properly? I'm wondering if accessing 2 drives for > reads, adds latency and hence the throughput suffers. Hi, What kind of reads are you seeing the degradation with? Is it consistent with different sizes and random/seq? Any interesting spikes or valleys during the tests? > > Thanks > > Pankaj > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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