Hi, Thank you for the answer. But how fast is the replication from ceph happening? Because if it's not almost instantaneously you will loose some data is the hard drive fails. Does anybody know how fast are the copies written on other OSDs? On Fri, Dec 6, 2013 at 12:31 PM, Wido den Hollander <wido@xxxxxxxx> wrote: > On 12/06/2013 11:00 AM, Cristian Falcas wrote: >> >> Hi all, >> >> What will be the fastest disks setup between those 2: >> - 1 OSD build from 6 disks in raid 10 and one ssd for journal >> - 3 OSDs, each with 2 disks in raid 1 and a common ssd for all >> journals (or more ssds if ssd performance will be an issue) >> >> Mainly, will 1 OSD raid 10 be faster or slower then independent OSDs? >> > > Simply run 6 OSDs without any RAID and one SSD for the journaling. > > Danger is though, if you loose the journal, you loose all OSDs. So better > place two SSDs and then 3 OSDs per journal and make sure that using crush > objects go two OSDs on the different journals. > > You shouldn't use RAID underneath a OSD, let the replication handle all > that. > >> Best regards, >> Cristian Falcas >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > > -- > Wido den Hollander > 42on B.V. > > Phone: +31 (0)20 700 9902 > Skype: contact42on > _______________________________________________ > 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
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