Hi Mad,
El 09/04/16 a las 14:39, Mad Th escribió:
We have a 3 node proxmox/ceph cluster ... each with 4 x4 TB disks
Are you using 3-way replication? I guess you are. :)
1) If we want to add more disks , what are the things that we need to
be careful about?
Will the following steps automatically add it to ceph.conf?
ceph-disk zap /dev/sd[X]
pveceph createosd /dev/sd[X] -journal_dev /dev/sd[Y]
where X is new disk and Y is the journal disk.
Yes, this is the same as adding it from web GUI.
2) Is it safe to run different number of OSDs in the cluster, say one
server with 5 OSD and other two servers with 4OSD ? Though we have
plan to add one OSD to each server.
It is safe as long as none of your nodes OSDs are near-full. If you're
asking this because you're adding a new OSD to each node, step by step;
yes, it is safe.
Be prepared for data moving around when you add new disks. (performance
will suffer unless you have tuned some parameters in ceph.conf)
3) How do we safely add the new OSD to an existing storage pool?
New OSD will be used automatically by existing ceph pools unless you
have changed CRUSH map.
Cheers
Eneko
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