On 11/07/2012 10:12 AM, Atchley, Scott wrote:
On Nov 7, 2012, at 10:01 AM, Mark Nelson <mark.nelson@xxxxxxxxxxx> wrote:
On 11/07/2012 06:28 AM, Gandalf Corvotempesta wrote:
2012/11/7 Sage Weil <sage@xxxxxxxxxxx>:
On Wed, 7 Nov 2012, Gandalf Corvotempesta wrote:
I'm evaluating some SSD drives as journal.
Samsung 840 Pro seems to be the fastest in sequential reads and write.
The 840 Pro seems to reach 485MB/s in sequential write:
http://www.storagereview.com/samsung_ssd_840_pro_review
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I'm using Intel 510s in a test node and can do about 450MB/s per drive.
Is that sequential read or write? Intel lists them at 210-315 MB/s for sequential write. The 520s are rated at 475-520 MB/s seq. write.
Doh, wrote that too early in the morning after staying all night
watching the elections. :) You are correct, it's the 520, not the 510.
Right now I'm doing 3 journals per SSD, but topping out at about
1.2-1.4GB/s from the client perspective for the node with 15+ drives and
5 SSDs. It's possible newer versions of the code and tuning may
increase that.
What interconnect is this? 10G Ethernet is 1.25 GB/s line rate and I would expect your Sockets and Ceph overhead to eat into that. Or is it dual 10G Ethernet?
Scott
This is 8 concurrent instances of rados bench running on localhost.
Ceph is configured with 1x replication. 1.2-1.4GB/s is the aggregate
throughput of all of the rados bench instances.
TV pointed me at the new Intel DC S3700 which looks like a very
interesting option (the 100GB model for $240).
http://www.anandtech.com/show/6432/the-intel-ssd-dc-s3700-intels-3rd-generation-controller-analyzed
Mark
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