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@xxxxxxxxxxxxxx www.PerformAir.com -----Original Message----- From: Frank Schilder [mailto:frans@xxxxxx] Sent: Wednesday, June 24, 2020 9:15 AM To: Marc Roos; paul.emmerich Cc: bknecht; ceph-users; s.priebe Subject: 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@xxxxxxxxxxxxxxxxx> Sent: 24 June 2020 18:08:49 To: Frank Schilder; paul.emmerich Cc: bknecht; ceph-users; s.priebe Subject: RE: 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. _______________________________________________ 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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