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(a)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 Risø Campus
Bygning 109, rum S14
________________________________________
From: Marc Roos <M.Roos(a)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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