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ceph: add a bit to OSD replacement

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2019-11-06 18:50:11 +01:00
parent c998bdf2b4
commit af6f59f49f
1 changed files with 9 additions and 4 deletions
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pveceph.adoc
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@ -719,12 +719,20 @@ pveceph pool destroy NAME
Ceph maintenance
----------------
Replace OSDs
~~~~~~~~~~~~
One of the common maintenance tasks in Ceph is to replace a disk of an OSD. If
a disk is already in a failed state, then you can go ahead and run through the
steps in xref:pve_ceph_osd_destroy[Destroy OSDs]. Ceph will recreate those
copies on the remaining OSDs if possible.
copies on the remaining OSDs if possible. This rebalancing will start as soon
as an OSD failure is detected or an OSD was actively stopped.
NOTE: With the default size/min_size (3/2) of a pool, recovery only starts when
`size + 1` nodes are available. The reason for this is that the Ceph object
balancer xref:pve_ceph_device_classes[CRUSH] defaults to a full node as
`failure domain'.
To replace a still functioning disk, on the GUI go through the steps in
xref:pve_ceph_osd_destroy[Destroy OSDs]. The only addition is to wait until
@ -750,9 +758,6 @@ pveceph osd destroy <id>
Replace the old disk with the new one and use the same procedure as described
in xref:pve_ceph_osd_create[Create OSDs].
NOTE: With the default size/min_size (3/2) of a pool, recovery only starts when
`size + 1` nodes are available.
Run fstrim (discard)
~~~~~~~~~~~~~~~~~~~~
It is a good measure to run 'fstrim' (discard) regularly on VMs or containers.