<div dir="auto">I'd create a single raidcheck.service that runs daily and calls a script that itself determines which device to check, e.g. /dev/md$[dayofyear % 16].</div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jul 26, 2020, 22:56 Ian Pilcher <<a href="mailto:arequipeno@gmail.com" target="_blank" rel="noreferrer">arequipeno@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">My NAS has 16 MD RAID devices. I've created a simple service (raidcheck@.service) that will trigger a check of the RAID device identified by the argument. E.g., 'systemctl start raidcheck@md1' will trigger the check of md1 (after checking that no other array is being checked/synced, no arrays are degraded, etc.). It takes 6-8 hours to check one of these arrays, so I want to run one check every night at 23:00. So (picking tonight as an arbitrary starting point) md1 would run tonight, md2 would run tomorrow night, md3 would run the following night ... all the way through md16. Then the cycle would start over with md1. I had thought that I would be able to create 16 separate timers (one for each device), each scheduled to trigger every 16 days at 23:00, starting on a particular day. Looking through the systemd.timer(5) and systemd.time(7) man pages, however, I haven't been able to figure out how to do this. Is it not possible, or am I missing something? -- ======================================================================== In Soviet Russia, Google searches you! ======================================================================== _______________________________________________ systemd-devel mailing list <a href="mailto:systemd-devel@lists.freedesktop.org" rel="noreferrer noreferrer" target="_blank">systemd-devel@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/systemd-devel" rel="noreferrer noreferrer noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/systemd-devel</a> </blockquote></div>