Hi,
two years ago I created this tracker:
https://tracker.ceph.com/issues/61861
There was also a thread here on this list:
https://lists.ceph.io/hyperkitty/list/[email protected]/message/RLTF4NTN5KGRSI4LEO43XUGHHP2GTKKO/
We did consider it during a proof of concept once, but I had the
impression that the plugin did not work as expected, and so did OP
from the mentioned thread. So if you asked me, I wouldn't recommend it.
Regards,
Eugen
Zitat von Joachim Kraftmayer <[email protected]>:
Hi Torkil,
I would be interested in your results. It's been a few years since I saw
the LRC plugin in production.
Does anyone else in the ceph community use it?
Joachim
[email protected]
www.clyso.com
Hohenzollernstr. 27, 80801 Munich
Utting | HR: Augsburg | HRB: 25866 | USt. ID-Nr.: DE275430677
Am Mi., 7. Mai 2025 um 21:00 Uhr schrieb Torkil Svensgaard <[email protected]
:
On 07-05-2025 18:16, Anthony D'Atri wrote:
>
>
>> On May 7, 2025, at 5:06 AM, Janne Johansson <[email protected]>
wrote:
>>
>> Den ons 7 maj 2025 kl 10:59 skrev Torkil Svensgaard <[email protected]>:
>>> We are looking at a cluster split between two DCs with the DCs as
>>> failure domains.
>>>
>>> Am I right in assuming that any recovery or backfill taking place
should
>>> largely happen inside each DC and not between them? Or can no such
>>> assumptions be made?
>>> Pools would be EC 4+8, if that matters.
>>
>> Unless I am mistaken, the first/primary of each PG is the one "doing"
>> the backfills, so if the primaries are evenly distributed between the
>> sites, the source of all backfills would be in the remote DC in 50% of
>> the cases.
>
> Are we talking about recovery, or backfill?
I was asking about both
>> I do not think the backfills are going to calculate how it can use
>> only "local" pieces to rebuild a missing/degraded PG piece without
>> going over the DC-DC link even if it is theoretically possible.
>
> The LRC plugin might be able to localize *recovery*, but backfill from
adding OSDs, changing CRUSH rules, etc. would always have to hit both.
Thanks both, I'll take a look at the LRC plugin.
Mvh.
Torkil
>> --
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Torkil Svensgaard
Sysadmin
MR-Forskningssektionen, afs. 714
DRCMR, Danish Research Centre for Magnetic Resonance
Hvidovre Hospital
Kettegård Allé 30
DK-2650 Hvidovre
Denmark
Tel: +45 386 22828
E-mail: [email protected]
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