Thank you Uwe. That clarifies it. On Sat, Dec 7, 2013 at 5:43 PM, Uwe Grohnwaldt <uwe@xxxxxxxxxxxxx> wrote: > hi, > > you can find the ceph architecture on this page: http://ceph.com/docs/master/architecture/ > > the interessting picture for you may be this one: > http://ceph.com/docs/master/_images/ditaa-54719cc959473e68a317f6578f9a2f0f3a8345ee.png > > your client writes the file to one osd, and before this osd acknowledges your write request, it ensure that it is copied to other osd(s). > > Mit freundlichen Grüßen / Best Regards, > -- > Uwe Grohnwaldt > > ----- Original Message ----- >> From: "Cristian Falcas" <cristi.falcas@xxxxxxxxx> >> To: "Wido den Hollander" <wido@xxxxxxxx> >> Cc: ceph-users@xxxxxxxxxxxxxx >> Sent: Samstag, 7. Dezember 2013 15:44:08 >> Subject: Re: how to set up disks in the same host >> >> 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 >> > _______________________________________________ > 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
 |