+1 for sTec, I'm using sTec ZeusRAM devices (expensive, small capacity - 8GB) but if write latency is important.. 4x OSDs (3TB 7200rpm SATA) to each ZeusRAM for our scenario. \\Chris ----- Original Message ----- From: "Charles 'Boyo" <charlesboyo@xxxxxxxxx> To: "Mark Nelson" <mark.nelson@xxxxxxxxxxx> Cc: ceph-users@xxxxxxxxxxxxxx Sent: Tuesday, 23 July, 2013 4:27:07 AM Subject: Re: SSD recommendations for OSD journals On Mon, Jul 22, 2013 at 7:10 PM, Mark Nelson <mark.nelson@xxxxxxxxxxx> wrote: > On 07/22/2013 01:02 PM, Oliver Fuckner wrote: >> Good evening, >> >> >> >> On the second look you see that they use 4 Sandisk X100 SSDs in RAID5 >> and those SSDs only have 80TBytes Write Endurance each... that makes me >> nervous. > > I'm less interested in the nvdrive, and more interested in the nvram. > with 8GB of RAM you could reasonably do journals for 24 OSDs and it's > backed by 32GB of flash for power failure. Only questions are whether > or not the board itself is reliable (though hopefully it would be no > less reliable than a traditional SAS controller), and whether or not the > super capacitor can be trusted. > > Of course cost could be an issue... > Barring the cost, sTec solutions have proven reliable for me. Check out the s1122 with 1.6 TB capacity and 90PB write endurance: http://www.stec-inc.com/products/s1120-pcie-accelerator/ Charles _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |