On 27. sep. 2017 10:09, Pierre Palussiere wrote:
Hi,
Is anyone know if it’s possible to re install ceph on a host and keep osd without wipe data on them ?
Hope you can help me,
it depends... if you have journal on same drive as osd, you should be
able to eject the drive from a server, connect it to another and udev
should mount and active osd (data will ofcourse move)
i can not see why reinstall of a host would be much different from
moving the disk.
if you have journal on a separate device then you need to move osd and
journal device together. you can also have configuration that makes this
process less automatic.
!BUT! i would not in any way risk reinstalling a host with live osd's.!
I would set all osd's out and let the data remap to other osd's so you
have a temporary replica on other osd's. while reinstalling. the
backfill should be fast since the data is still on disk.
or
I would set crush weight to 0 and drain all osd's off the node before
reinstalling. here the backfill will take longer, since you actualy have
to refill disks.
kind regards
Ronny Aasen
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