Hello, > We started having high wait times on the M600s so we got 6 S3610s, 6 M500dcs, and 6 500 GB M600s (they have the SLC to MLC conversion that we thought might work better). Is it working better as you were expecting? > We have graphite gathering stats on the admin sockets for Ceph and the standard system stats. Very cool! > We weighted the drives so they had the same byte usage and let them run for a week or so, then made them the same percentage of used space, let them run a couple of weeks, then set them to 80% full and let them run a couple of weeks. Almost exactly same *byte* usage? I'm pretty interesting to how you realized that. > We compared IOPS and IO time of the drives to get our comparison. What is your feeling about the comparison? > This was done on live production clusters and not synthetic benchmarks. How large is your production the Ceph cluster? Rgds, Shinobu > > Hello, > > On Wed, 24 Feb 2016 22:56:15 -0700 Robert LeBlanc wrote: > > > We are moving to the Intel S3610, from our testing it is a good balance > > between price, performance and longevity. But as with all things, do your > > testing ahead of time. This will be our third model of SSDs for our > > cluster. The S3500s didn't have enough life and performance tapers off > > add it gets full. The Micron M600s looked good with the Sebastian journal > > tests, but once in use for a while go downhill pretty bad. We also tested > > Micron M500dc drives and they were on par with the S3610s and are more > > expensive and are closer to EoL. The S3700s didn't have quite the same > > performance as the S3610s, but they will last forever and are very stable > > in terms of performance and have the best power loss protection. > > > That's interesting, how did you come to that conclusion and how did test > it? > Also which models did you compare? > > > > Short answer is test them for yourself to make sure they will work. You > > are pretty safe with the Intel S3xxx drives. The Micron M500dc is also > > pretty safe based on my experience. It had also been mentioned that > > someone has had good experience with a Samsung DC Pro (has to have both > > DC and Pro in the name), but we weren't able to get any quick enough to > > test so I can't vouch for them. > > > I have some Samsung DC Pro EVOs in production (non-Ceph, see that > non-barrier thread). > They do have issues with LSI occasionally, haven't gotten around to make > that FS non-barrier to see if it fixes things. > > The EVOs are also similar to the Intel DC S3500s, meaning that they are > not really suitable for Ceph due to their endurance. > > Never tested the "real" DC Pro ones, but they are likely to be OK. > > Christian > > > Sent from a mobile device, please excuse any typos. > > On Feb 24, 2016 6:37 PM, "Shinobu Kinjo" <skinjo@xxxxxxxxxx> wrote: > > > > > Hello, > > > > > > There has been a bunch of discussion about using SSD. > > > Does anyone have any list of SSDs describing which SSD is highly > > > recommended, which SSD is not. > > > > > > Rgds, > > > Shinobu > > > _______________________________________________ > > > ceph-users mailing list > > > ceph-users@xxxxxxxxxxxxxx > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > Christian Balzer Network/Systems Engineer > chibi@xxxxxxx Global OnLine Japan/Rakuten Communications > http://www.gol.com/ > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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