And should I mention that in another CEPH installation we had samsung 850 pro 128GB and all of 6 ssds died in 2 month period - simply disappear from the system, so not wear out...
Never again we buy Samsung :)
On Aug 25, 2015 11:57 AM, "Andrija Panic" <andrija.panic@xxxxxxxxx> wrote:First read please:
http://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/We are getting 200 IOPS in comparison to Intels3500 18.000 iops - those are constant performance numbers, meaning avoiding drives cache and running for longer period of time...
Also if checking with FIO you will get better latencies on intel s3500 (model tested in our case) along with 20X better IOPS results...We observed original issue by having high speed at begining of i.e. file transfer inside VM, which than halts to zero... We moved journals back to HDDs and performans was acceptable...no we are upgrading to intel S3500...
Best
any details on that ?
On Tue, 25 Aug 2015 11:42:47 +0200, Andrija Panic
<andrija.panic@xxxxxxxxx> wrote:
> Make sure you test what ever you decide. We just learned this the hard way
> with samsung 850 pro, which is total crap, more than you could imagine...
>
> Andrija
> On Aug 25, 2015 11:25 AM, "Jan Schermer" <jan@xxxxxxxxxxx> wrote:
>
> > I would recommend Samsung 845 DC PRO (not EVO, not just PRO).
> > Very cheap, better than Intel 3610 for sure (and I think it beats even
> > 3700).
> >
> > Jan
> >
> > > On 25 Aug 2015, at 11:23, Christopher Kunz <chrislist@xxxxxxxxxxx>
> > wrote:
> > >
> > > Am 25.08.15 um 11:18 schrieb Götz Reinicke - IT Koordinator:
> > >> Hi,
> > >>
> > >> most of the times I do get the recommendation from resellers to go with
> > >> the intel s3700 for the journalling.
> > >>
> > > Check out the Intel s3610. 3 drive writes per day for 5 years. Plus, it
> > > is cheaper than S3700.
> > >
> > > Regards,
> > >
> > > --ck
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> >
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@xxxxxxxxxxxxxx
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >
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