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