been reading up on the Seagate Constellation ES SED, don’t see anything saying that can be done. I plan to swap one with a spare non-SED I have next week to see if perf goes normal. -Ed > On Aug 8, 2020, at 5:56 AM, Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote: > > > Maybe to obvious suggestion, but what about disabling SED on one of > these drives? > > > -----Original Message----- > Cc: ceph-users@xxxxxxx > Subject: SED drives , poor performance > > Im getting poor performance with 5 of my OSDs, Seagate Constellation ES > SED (1) 10k SAS 2TB 3.5 drives. > disk write latency keeps drifting high , 100ms-230ms on writes. the > other 30 OSDs are performing well. avg latency 10-20ms > > We observe stats via “iostat -xtc 2” on CEPH server. w_await showing > writes to disk latency. > > **anyone else have poor latency on SEDs? > > The disks were included on a server we acquired. Didn’t know they would > be SEDs. > I’ve read that seagate SED vs. non SED shouldn’t perform differently, > but looks like they are awful. All the SEDs are in the newly added CEPH > node. A Dell R510 with H700 raid card. all disks in entire cluster are > R0, direct write to disk, no cache. > The new server and disk control spec out at about 10x the ability and > IOPs of other servers, so I suspect the SEDs. > > -Ed > _______________________________________________ > 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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