> Hi all > > I'm building a small ceph cluster with 3 nodes (my first ceph cluster). > Each Node with one System Disk, one Journal SSD Disk and one SATA OSD > Disk. > > My question is now should I use Desktop or Enterprise SATA Drives? > Enterprise Drives have a higher MTBF but the Firmware is actually build for > RAID Controllers > which have different timing. WD calls that TELR, Seagate Error Recovery > Control (ERC). > In case of an error, they make shure the RAID Controller doesn't throw them > out of the array after short time. Do you mean that the RAID controller _does_ through them out after a very short time? > Desktop Drives can try seconds to minutes until they give up. > Can Rados/Ceph handle such long time without get answer from the Drive? > Will the Node then marked bad/out from the cluster? > Your users might not like the delays. For a single disk it makes sense to retry for a while to try and give the user their data. For RAID it makes no sense. Fail immediately and eject the disk and don't make delays. I wonder if those settings can be tweaked at all? James _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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