Hi, thanks for your reply!
Stretch mode is obviously useful with small pools, but with its size of
4 this is a 25% efficiency and we can't afford it (buying 16 PiB raw for
4 PiB net, it's quite hard to justify to budget holders...).
Good to hear that you used such EC setup in prod, thanks for sharing!
Cheers,
F.
On 3/24/23 13:11, Eugen Block wrote:
Hi,
we have multiple customers with such profiles, for example one with k7
m11 for a two-site cluster (in total 20 nodes). The customer is pretty
happy with the resiliency because they actually had multiple outages
of one DC and everything was still working fine. Although there's also
the stretch mode (which I haven't tested properly yet) I can encourage
you to use such a profile. Just be advised to properly test your crush
rule. ;-)
Regards,
Eugen
Zitat von Fabien Sirjean <fsirjean@xxxxxxxxxxxx>:
Hi Ceph users!
I've been proposed an interesting EC setup I hadn't thought about
before.
Scenario is : we have two server rooms and want to store ~4PiB with
the ability to loose 1 server room without loss of data or RW
availability.
For the context, performance is not needed (cold storage mostly, used
as a big filesystem).
The idea is to use EC 8+12 over 24 servers (12 on each server room),
so if we loose 1 room we still have half of the EC parts (10/20) and
are able to loose 2 more servers before reaching the point where we
loose data.
I find this pretty elegant when working on a two-sites context, as
efficiency is 40% (better than 33% three times replication) and the
redundancy is good.
What do you think of this setup ? Did you ever used EC profiles with
M > K ?
Thanks for sharing your thoughts!
Cheers,
Fabien
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