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List:       ceph-users
Subject:    [ceph-users] Re: High ceph_osd_commit_latency_ms on Toshiba MG07ACA14TE HDDs
From:       Frank Schilder <frans () dtu ! dk>
Date:       2020-06-24 16:06:02
Message-ID: 9334abd5e13e45c7b661fe98161f2c76 () dtu ! dk
[Download RAW message or body]

Sorry for the spam, but I need to add this disclaimer:

Although it is documented as safe to disable volatile write cache on a disk in use, I \
would probably not do it. The required cache flush might be erroneous in the \
firmware.

Therefore, the method I use will not necessarily apply to OSD set-ups with WAL/DB \
partitions, multiple OSDs per disk and other set-ups where several daemons share the \
same drive. Here, more logic seems warranted. This also means that OSD daemons can \
probably not just do it without checking if a drive is currently in use or not.

Best regards,
=================
Frank Schilder
AIT Risų Campus
Bygning 109, rum S14

________________________________________
From: Frank Schilder <frans@dtu.dk>
Sent: 24 June 2020 18:00:19
To: Marc Roos; paul.emmerich
Cc: bknecht; ceph-users; s.priebe
Subject: [ceph-users] Re: High ceph_osd_commit_latency_ms on Toshiba MG07ACA14TE HDDs

I use the stable ceph/daemon containers and introduced my own startup script for the \
container entrypoint. On the action "disk activate", it does a smartctl on the device \
argument before executing entrypoint.sh.

Best regards,
=================
Frank Schilder
AIT Risų Campus
Bygning 109, rum S14

________________________________________
From: Marc Roos <M.Roos@f1-outsourcing.eu>
Sent: 24 June 2020 17:55:35
To: Frank Schilder; paul.emmerich
Cc: bknecht; ceph-users; s.priebe
Subject: RE: [ceph-users] Re: High ceph_osd_commit_latency_ms on Toshiba MG07ACA14TE \
HDDs

> I run the corresponding smartctl command on every drive just before
OSD daemon start.

How/where did you do this?
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