On Fri, Dec 13, 2019 at 11:49:50PM +0100, Oscar Segarra wrote:
Hi,
I have recently started working with Ceph Nautilus release and I have
realized that you have to start working with LVM to create OSD instead
of the "old fashioned" ceph-disk.
In terms of performance and best practices, as far as I must use LVM I
can create volume groups that joins or extends two or more physical
disks. In this scenario (many disks for server) where ceph-volume is
manatory, It still remains the rule of one OSD for each physical
device? or I can reduce the number of OSDs?
That is hard to answer generically. ceph-volume will not create multi-disk
volumes. One disk, one OSD is still the recommendation afaik.
However there are certainly scenarios where multi-disk OSDs are sensible. For
example if you have a machine that has _a lot_ of disks attached but lacks CPU
and RAM to run as many OSDs as disks, it can make sense to deploy one OSD on
multiple disks.
Thanks in advance,
Óscar
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