Hello, Looking at using 2 x 960GB SSD's (SM863) Reason for larger is I was thinking would be better off with them in Raid 1 so enough space for OS and all Journals. Instead am I better off using 2 x 200GB S3700's instead, with 5 disks per a SSD? Thanks, Ashley -----Original Message----- From: Christian Balzer [mailto:chibi@xxxxxxx] Sent: 13 July 2016 01:12 To: ceph-users@xxxxxxxxxxxxxx Cc: Wido den Hollander <wido@xxxxxxxx>; Ashley Merrick <ashley@xxxxxxxxxxxxxx> Subject: Re: SSD Journal Hello, On Tue, 12 Jul 2016 19:14:14 +0200 (CEST) Wido den Hollander wrote: > > > Op 12 juli 2016 om 15:31 schreef Ashley Merrick <ashley@xxxxxxxxxxxxxx>: > > > > > > Hello, > > > > Looking at final stages of planning / setup for a CEPH Cluster. > > > > Per a Storage node looking @ > > > > 2 x SSD OS / Journal > > 10 x SATA Disk > > > > Will have a small Raid 1 Partition for the OS, however not sure if best to do: > > > > 5 x Journal Per a SSD > > Best solution. Will give you the most performance for the OSDs. RAID-1 will just burn through cycles on the SSDs. > > SSDs don't fail that often. > What Wido wrote, but let us know what SSDs you're planning to use. Because the detailed version of that sentence should read: "Well known and tested DC level SSDs whose size/endurance levels are matched to the workload rarely fail, especially unexpected." > Wido > > > 10 x Journal on Raid 1 of two SSD's > > > > Is the "Performance" increase from splitting 5 Journal's on each SSD worth the "issue" caused when one SSD goes down? > > As always, assume at least a node being the failure domain you need to be able to handle. Christian > > Thanks, > > Ashley > > _______________________________________________ > > 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/Rakuten 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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