On Mon, 6 Oct 2014 14:59:02 +1300 Andrew Thrift wrote: > Hi Mark, > > Would you see any benefit in using a Intel P3700 NVMe drive as a journal > for say 6x Intel S3700 OSD's ? > I don't wanna sound facetious, but buy some, find out and tell us. ^o^ Seriously, common sense might suggest it being advantageous, but all the recent posts of having a SSD journaling for another SSD showed it to be slower than just have the journal on the same OSD SSD. YMMV. Christian > > > On Fri, Oct 3, 2014 at 6:58 AM, Mark Nelson <mark.nelson@xxxxxxxxxxx> > wrote: > > > On 10/02/2014 12:48 PM, Adam Boyhan wrote: > > > >> Hey everyone, loving Ceph so far! > >> > > > > Hi! > > > > > > > >> We are looking to role out a Ceph cluster with all SSD's. Our > >> application is around 30% writes and 70% reads random IO. The plan is > >> to start with roughly 8 servers with 8 800GB Intel DC S3500's per > >> server. I wanted to get some input on the use of the DC S3500. Seeing > >> that we are primarily a read environment, I was thinking we could > >> easily get away with the S3500 instead of the S3700 but I am unsure? > >> Obviously the price point of the S3500 is very attractive but if they > >> start failing on us too soon, it might not be worth the savings. My > >> largest concern is the journaling of Ceph, so maybe I could use the > >> S3500's for the bulk of the data and utilize a S3700 for the > >> journaling? > >> > > > > I'd suggest if you are using SSDs for OSDs anyway, you are better off > > just putting the journal on the SSD so you don't increase the number > > of devices per OSD that can cause failure. In terms of the S3500 vs > > the S3700, it's all a numbers game. Figure out how much data you > > expect to write, how many drives you have, what the expected write > > endurance of each drive is, replication, journaling, etc, and figure > > out what you need! :) > > > > The S3500 may be just fine, but it depends entirely on your write > > workload. > > > > > >> I appreciate the input! > >> > >> Thanks All! > >> > >> > >> _______________________________________________ > >> 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 > > -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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