(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@gmail.com> 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@digitalocean.com> 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@gmail.com> 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@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io