(trimming out the dev list and Radoslaw's email) Hello, I think the two critical PRs were: * https://github.com/ceph/ceph/pull/44585 - included in 15.2.16 * https://github.com/ceph/ceph/pull/45655 - included in 15.2.17 I don't have any comments on tweaking those configuration values, and what safe values would be. Josh On Sun, Mar 12, 2023 at 9:43 PM yite gu <yitegu0@xxxxxxxxx> wrote: > > Hello, Baergen > Thanks for your reply. Restart osd in planned, but my version is 15.2.7, so, I may have encountered the problem you said. Could you provide PR to me about optimize this mechanism? Besides that, if I don't want to upgrade version in recently, is a good way that adjust osd_pool_default_read_lease_ratio to lower? For example, 0.4 or 0.2 to reach the user's tolerance time. > > Yite Gu > > Josh Baergen <jbaergen@xxxxxxxxxxxxxxxx> 于2023年3月10日周五 22:09写道： >> >> Hello, >> >> When you say "osd restart", what sort of restart are you referring to >> - planned (e.g. for upgrades or maintenance) or unplanned (OSD >> hang/crash, host issue, etc.)? If it's the former, then these >> parameters shouldn't matter provided that you're running a recent >> enough Ceph with default settings - it's supposed to handle planned >> restarts with little I/O wait time. There were some issues with this >> mechanism before Octopus 15.2.17 / Pacific 16.2.8 that could cause >> planned restarts to wait for the read lease timeout in some >> circumstances. >> >> Josh >> >> On Fri, Mar 10, 2023 at 1:31 AM yite gu <yitegu0@xxxxxxxxx> wrote: >> > >> > Hi all, >> > osd_heartbeat_grace = 20 and osd_pool_default_read_lease_ratio = 0.8 by >> > default, so, pg will wait 16s when osd restart in the worst case. This wait >> > time is too long, client i/o can not be unacceptable. I think adjusting >> > the osd_pool_default_read_lease_ratio to lower is a good way. Have any good >> > suggestions about reduce pg wait time？ >> > >> > Best Regard >> > Yite Gu >> > _______________________________________________ >> > 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
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