Hi Christian,
On Fri, 30 Jan 2015 01:22:53 +0200 Georgios Dimitrakakis wrote:
Urged by a previous post by Mike Winfield where he suffered a
leveldb
loss
I would like to know which files are critical for CEPH operation
and
must
be backed-up regularly and how are you people doing it?
Aside from probably being quite hard/disruptive to back up a monitor
leveldb, it will also be quite pointless, as it constantly changes.
I can understand that about leveldb. But besides that are there any
other files that can be backed up just in case?
This is why one has at least 3 monitors on different machines that
are on
different UPS backed circuits and storing things on SSDs that are
also
power failure proof.
And if a monitor gets destroyed like that, the official fix suggested
by
the Ceph developers is to re-create it from scratch and let it catch
up to
the "good" monitors.
That being said, aside from a backup of the actual data on the
cluster
(which is another challenge), one wonders if in Mike's case a "RBD
FSCK"
of sorts can be created that is capable of restoring things based on
the
actual data still on the OSDs.
So if I understand correctly if one loses the monitors then all the
data cannot be
accessed even if they still exist on the OSDs?
Is there a feature like that that can get the data that still exist on
the OSDs?
Christian
All the best,
George
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