I’m looking at 4TB Intel DC P4510 for data drives running BlueStore with WAL, 
DB and data on the same drives.  Has anyone had any good / bad experiences with 
them?  As Intel’s new data centre NVMe SSD it should be fast and reliable but 
then I would have thought the same about the DC S4600 drives which currently 
seem best to avoid…


> On 11 Jul 2018, at 11:57, Paul Emmerich <paul.emmer...@croit.io> wrote:
> Hi,
> we‘ve no long-term data for the SM variant.
> Performance is fine as far as we can tell, but the main difference between 
> these two models should be endurance.
> Also, I forgot to mention that my experiences are only for the 1, 2, and 4 TB 
> variants. Smaller SSDs are often proportionally slower (especially below 
> 500GB).
> Paul
> Robert Stanford <rstanford8...@gmail.com>:
>> Paul -
>>  That's extremely helpful, thanks.  I do have another cluster that uses 
>> Samsung SM863a just for journal (spinning disks for data).  Do you happen to 
>> have an opinion on those as well?
>> On Wed, Jul 11, 2018 at 4:03 AM, Paul Emmerich <paul.emmer...@croit.io> 
>> wrote:
>> PM/SM863a are usually great disks and should be the default go-to option, 
>> they outperform
>> even the more expensive PM1633 in our experience.
>> (But that really doesn't matter if it's for the full OSD and not as 
>> dedicated WAL/journal)
>> We got a cluster with a few hundred SanDisk Ultra II (discontinued, i 
>> believe) that was built on a budget.
>> Not the best disk but great value. They have been running since ~3 years now 
>> with very few failures and
>> okayish overall performance.
>> We also got a few clusters with a few hundred SanDisk Extreme Pro, but we 
>> are not yet sure about their 
>> long-time durability as they are only ~9 months old (average of ~1000 write 
>> IOPS on each disk over that time).
>> Some of them report only 50-60% lifetime left.
>> For NVMe, the Intel NVMe 750 is still a great disk
>> Be carefuly to get these exact models. Seemingly similar disks might be just 
>> completely bad, for
>> example, the Samsung PM961 is just unusable for Ceph in our experience.
>> Paul
>> 2018-07-11 10:14 GMT+02:00 Wido den Hollander <w...@42on.com>:
>> On 07/11/2018 10:10 AM, Robert Stanford wrote:
>> > 
>> >  In a recent thread the Samsung SM863a was recommended as a journal
>> > SSD.  Are there any recommendations for data SSDs, for people who want
>> > to use just SSDs in a new Ceph cluster?
>> > 
>> Depends on what you are looking for, SATA, SAS3 or NVMe?
>> I have very good experiences with these drives running with BlueStore in
>> them in SuperMicro machines:
>> - SATA: Samsung PM863a
>> - SATA: Intel S4500
>> - SAS: Samsung PM1633
>> - NVMe: Samsung PM963
>> Running WAL+DB+DATA with BlueStore on the same drives.
>> Wido
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