This sounds interesting because this way the pressure wouldn't be too big if go like 0.1 0.2 OSD by OSD. What I can see how ceph did it, when add the new OSDs, the complete host get the remapped pgs from other hosts also, so the old osds PG number increased by like +50% (which was already overloaded) and slowly rebalance to the newly added osds on the same host. This initial pressure to big. This "misplaced ratio to 1%" I've never tried, let me read a bit, thank you. Istvan ________________________________ From: Eugen Block <eblock@xxxxxx> Sent: Saturday, September 7, 2024 4:55:40 AM To: ceph-users@xxxxxxx <ceph-users@xxxxxxx> Subject: Re: Somehow throotle recovery even further than basic options? Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ I can’t say anything about the pgremapper, but have you tried increasing the crush weight gradually? Add new OSDs with crush initial weight 0 and then increase it in small steps. I haven’t used that approach for years, but maybe that can help here. Or are all OSDs already up and in? Or you could reduce the max misplaced ratio to 1% or even lower (default is 5%)? Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo@xxxxxxxxx>: > Forgot to paste, somehow I want to reduce this recovery operation: > recovery: 0 B/s, 941.90k keys/s, 188 objects/s > To 2-300Keys/sec > > > > ________________________________ > From: Szabo, Istvan (Agoda) <Istvan.Szabo@xxxxxxxxx> > Sent: Friday, September 6, 2024 11:18 PM > To: Ceph Users <ceph-users@xxxxxxx> > Subject: Somehow throotle recovery even further than > basic options? > > Hi, > > 4 years ago we've created our cluster with all disks 4osds (ssds and > nvme disks) on octopus. > The 15TB SSDs still working properly with 4 osds but the small 1.8T > nvmes with the index pool not. > Each new nvme osd adding to the existing nodes generates slow ops > with scrub off, recovery_op_priority 1, backfill and recovery 1-1. > I even turned off all index pool heavy sync mechanism but the read > latency still high which means recovery op pushes it even higher. > > I'm trying to somehow add resource to the cluster to spread the 2048 > index pool pg (in replica 3 means 6144pg index pool) but can't make > it more gentle. > > The balancer is working in upmap with max deviation 1. > > Have this script from digitalocean > https://github.com/digitalocean/pgremapper, is there anybody tried > it before how is it or could this help actually? > > Thank you the ideas. > > ________________________________ > This message is confidential and is for the sole use of the intended > recipient(s). It may also be privileged or otherwise protected by > copyright or other legal rules. If you have received it by mistake > please let us know by reply email and delete it from your system. It > is prohibited to copy this message or disclose its content to > anyone. Any confidentiality or privilege is not waived or lost by > any mistaken delivery or unauthorized disclosure of the message. All > messages sent to and from Agoda may be monitored to ensure > compliance with company policies, to protect the company's interests > and to remove potential malware. Electronic messages may be > intercepted, amended, lost or deleted, or contain viruses. > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx ________________________________ This message is confidential and is for the sole use of the intended recipient(s). It may also be privileged or otherwise protected by copyright or other legal rules. If you have received it by mistake please let us know by reply email and delete it from your system. It is prohibited to copy this message or disclose its content to anyone. Any confidentiality or privilege is not waived or lost by any mistaken delivery or unauthorized disclosure of the message. All messages sent to and from Agoda may be monitored to ensure compliance with company policies, to protect the company's interests and to remove potential malware. Electronic messages may be intercepted, amended, lost or deleted, or contain viruses. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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