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List:       ceph-users
Subject:    [ceph-users] Re: High ceph_osd_commit_latency_ms on Toshiba MG07ACA14TE HDDs
From:       <DHilsbos () performair ! com>
Date:       2020-06-24 17:17:28
Message-ID: 0670B960225633449A24709C291A525243749B8C () COM01 ! performair ! local
[Download RAW message or body]

All;

This conversation has been fascinating.

I'm throwing my hat in the ring, though I know almost nothing about systemd...

Completely non-portable, but...
Couldn't you write a script to issue the necessary commands to the desired drives, \
then create a system unit that calls it before OSD initialization?

Thank you,

Dominic L. Hilsbos, MBA 
Director - Information Technology 
Perform Air International, Inc.
DHilsbos@PerformAir.com 
www.PerformAir.com



-----Original Message-----
From: Frank Schilder [mailto:frans@dtu.dk] 
Sent: Wednesday, June 24, 2020 9:15 AM
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 can remember reading this before. I was hoping you maybe had some
> setup with systemd scripts or maybe udev.

Yeah, doing this on boot up would be ideal. I was looking really hard into tuned and \
other services that claimed can do it, but required plugins or other stuff did/does \
not exist and documentation is close to non-existent.

After spending a couple of days I gave up and went with the simple script-command \
version.

If you come across something that allows easy configuration of this at boot-time, \
please let me know.

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

________________________________________
From: Marc Roos <M.Roos@f1-outsourcing.eu>
Sent: 24 June 2020 18:08:49
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

> 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.

I can remember reading this before. I was hoping you maybe had some
setup with systemd scripts or maybe udev.



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