Like most disk redundancy systems, the concern usually is the amount of time it takes to recover, wherein you are vulnerable to another failure. I would assume that is also the concern here.
On Wed, Jul 1, 2015 at 5:54 PM, Nate Curry <cu...@mosaicatm.com> wrote: > 4TB is too much to lose? Why would it matter if you lost one 4TB with the > redundancy? Won't it auto recover from the disk failure? > > Nate Curry > On Jul 1, 2015 6:12 PM, "German Anders" <gand...@despegar.com> wrote: > >> I would probably go with less size osd disks, 4TB is to much to loss in >> case of a broken disk, so maybe more osd daemons with less size, maybe 1TB >> or 2TB size. 4:1 relationship is good enough, also i think that 200G disk >> for the journals would be ok, so you can save some money there, the osd's >> of course configured them as a JBOD, don't use any RAID under it, and use >> two different networks for public and cluster net. >> >> *German* >> >> 2015-07-01 18:49 GMT-03:00 Nate Curry <cu...@mosaicatm.com>: >> >>> I would like to get some clarification on the size of the journal disks >>> that I should get for my new Ceph cluster I am planning. I read about the >>> journal settings on >>> http://ceph.com/docs/master/rados/configuration/osd-config-ref/#journal-settings >>> but that didn't really clarify it for me that or I just didn't get it. I >>> found in the Learning Ceph Packt book it states that you should have one >>> disk for journalling for every 4 OSDs. Using that as a reference I was >>> planning on getting multiple systems with 8 x 6TB inline SAS drives for >>> OSDs with two SSDs for journalling per host as well as 2 hot spares for the >>> 6TB drives and 2 drives for the OS. I was thinking of 400GB SSD drives but >>> am wondering if that is too much. Any informed opinions would be >>> appreciated. >>> >>> Thanks, >>> >>> *Nate Curry* >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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