I really advise removing the bastards becore they die...no rebalancing hapening just temp osd down while replacing journals...
What size and model are yours Samsungs?
We also just started having our 850 Pros die one after the other after about 9 months of service. 3 down, 11 to go... No warning at all, the drive is fine, and then it's not even visible to the machine. According to the stats in hdparm and the calcs I did they should have had years of life left, so it seems that ceph journals definitely do something they do not like, which is not reflected in their stats.QHOn Wed, Aug 26, 2015 at 7:15 AM, 10 minus <t10tennn@xxxxxxxxx> wrote:hthThe performance was better than our old setup so it was good enough.We did not run any synthetic benchmark since we had a specific use case.When we compared with Intel SSDs I think it was 3700 they were shade slower for our workload and considerably cheaper.Hi ,We got a good deal on 843T and we are using it in our Openstack setup ..as journals .
They have been running for last six months ... No issues .On Tue, Aug 25, 2015 at 12:07 PM, Andrija Panic <andrija.panic@xxxxxxxxx> wrote:We have some 850 pro 256gb ssds if anyone interested to buy:)
And also there was new 850 pro firmware that broke peoples disk which was revoked later etc... I'm sticking with only vacuum cleaners from Samsung for now, maybe... :)
On Aug 25, 2015 12:02 PM, "Voloshanenko Igor" <igor.voloshanenko@xxxxxxxxx> wrote:To be honest, Samsung 850 PRO not 24/7 series... it's something about desktop+ series, but anyway - results from this drives - very very bad in any scenario acceptable by real life...Possible 845 PRO more better, but we don't want to experiment anymore... So we choose S3500 240G. Yes, it's cheaper than S3700 (about 2x times), and no so durable for writes, but we think more better to replace 1 ssd per 1 year than to pay double price now.2015-08-25 12:59 GMT+03:00 Andrija Panic <andrija.panic@xxxxxxxxx>: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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> >
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> > ceph-users mailing list
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> >
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