On 2013-08-31 11:36, Dzianis Kahanovich wrote:
Johannes Klarenbeek пишет:
1) i read somewhere that it is recommended to have one OSD per disk in a production environment.
is this also the maximum disk per OSD or could i use multiple disks per OSD? and why?
you could use multiple disks for one OSD if you used some striping and abstract the disk (like LVM, MDRAID, etc). But it wouldn't make sense. One OSD writes into one filesystem, that is usually one disk in a production environment. Using RAID under it wouldn't increase neither reliability nor performance drastically.
I see some sense in RAID 0: single ceph-osd daemon per node (but still
disk-per-osd self). But if you have relative few [planned] cores per task on
node - you can think about it.
Raid-0: single disk failure kills the entire filesystem, off-lines the
osd and triggers a cluster-wide resync. Actual raid: single disk failure
does not affect the cluster in any way.
Dima
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