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 >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > 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. > 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 > 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 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
