Hi Timofey,
assuming that you have more than one OSD hosts and that the replicator
factor is equal (or less) to the number of the hosts why don't you just
change the crushmap to host replication?
You just need to change the default CRUSHmap rule from
step chooseleaf firstn 0 type osd
to
step chooseleaf firstn 0 type host
I believe that this is the easiest way to do have replication across
OSD nodes unless you have a much more "sophisticated" setup.
Regards,
George
Hi list,
i had experiments with crush maps, and I've try to get raid1 like
behaviour (if cluster have 1 working osd node, duplicate data across
local disk, for avoiding data lose in case local disk failure and
allow client working, because this is not a degraded state)
(
in best case, i want dynamic rule, like:
if has only one host -> spread data over local disks;
else if host count > 1 -> spread over hosts (rack o something
else);
)
i write rule, like below:
rule test {
ruleset 0
type replicated
min_size 0
max_size 10
step take default
step choose firstn 0 type host
step chooseleaf firstn 0 type osd
step emit
}
I've inject it in cluster and client node, now looks like have get
kernel panic, I've lost my connection with it. No ssh, no ping, this
is remote node and i can't see what happens until Monday.
Yes, it looks like I've shoot in my foot.
This is just a test setup and cluster destruction, not a problem, but
i think, what broken rules, must not crush something else and in
worst
case, must be just ignored by cluster/crushtool compiler.
May be someone can explain, how this rule can crush system? May be
this is a crazy mistake somewhere?
--
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