On 09/29/2014 03:58 AM, Dan Van Der Ster wrote:
Hi Emmanuel,
This is interesting, because we’ve had sales guys telling us that those Samsung
drives are definitely the best for a Ceph journal O_o !
Our sales guys or Samsung sales guys? :) If it was ours, let me know.
The conventional wisdom has been to use the Intel DC S3700 because of its
massive durability.
The S3700 is definitely one of the better drives on the market for Ceph
journals. Some of the higher end PCIE SSDs have pretty high durability
(and performance) as well, but cost more (though you can save SAS bay
space, so it's a trade-off).
Anyway, I’m curious what do the SMART counters say on your SSDs?… are they
really failing due to worn out P/E cycles or is it something else?
Cheers, Dan
On 29 Sep 2014, at 10:31, Emmanuel Lacour <elac...@easter-eggs.com> wrote:
Dear ceph users,
we are managing ceph clusters since 1 year now. Our setup is typically
made of Supermicro servers with OSD sata drives and journal on SSD.
Those SSD are all failing one after the other after one year :(
We used Samsung 850 pro (120Go) with two setup (small nodes with 2 ssd,
2 HD in 1U):
1) raid 1 :( (bad idea, each SSD support all the OSDs journals writes :()
2) raid 1 for OS (nearly no writes) and dedicated partition for journals
(one per OSD)
I'm convinced that the second setup is better and we migrate old setup
to this one.
Thought, statistics gives 60GB (option 2) to 100 GB (option 1) writes per day
on SSD on a not
really over loaded cluster. Samsung claims to give 5 years warranty if
under 40GB/day. Those numbers seems very low to me.
What are your experiences on this? What write volumes do you encounter,
on wich SSD models, which setup and what MTBF?
--
Easter-eggs Spécialiste GNU/Linux
44-46 rue de l'Ouest - 75014 Paris - France - Métro Gaité
Phone: +33 (0) 1 43 35 00 37 - Fax: +33 (0) 1 43 35 00 76
mailto:elac...@easter-eggs.com - http://www.easter-eggs.com
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