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Thanks Robert! Any thoughts on where that service or script resides? I would have thought it would be in the systemd folder but no joy.<br class="">
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<div class="" style="text-align: -webkit-auto; orphans: 2; widows: 2;"><i class=""><font face="Marion" size="4" class=""><br class="Apple-interchange-newline">
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<div class="" style="text-align: -webkit-auto; orphans: 2; widows: 2;"><font color="#800000" class=""><font face="Garamond" class=""><span class="" style="font-size: 10.5pt;"><b class=""><i class="">Dav Banks<br class="">
</i></b></span></font></font><font size="1" class=""><font face="Times New Roman" class=""><span class="" style="font-size: 9pt;">School of Architecture<br class="">
University of Virginia<br class="">
Campbell Hall, Rm 138<br class="">
(o) 434.243.8883<br class="">
(e) <a href="x-msg://236/davbanks@virginia.edu" class="">dav.banks@virginia.edu</a></span></font></font></div>
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<blockquote type="cite" class="">
<div class="">On Jul 23, 2019, at 4:06 AM, Robert Altnoeder <<a href="mailto:robert.altnoeder@linbit.com" class="">robert.altnoeder@linbit.com</a>> wrote:</div>
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<div class="">On 7/22/19 6:34 PM, Banks, David (db2d) wrote:<br class="">
<blockquote type="cite" class="">Is there a way to delay the loading of DRBD resources until after the underlying block system has made the devices available?<br class="">
<br class="">
I’ve looked in systemd but didn’t see any drbd services and wanted to ask before monkeying with that.<br class="">
</blockquote>
<br class="">
There must be some service or script somewhere that starts it, because<br class="">
DRBD itself does not automatically start resources when the kernel<br class="">
module is loaded.<br class="">
<br class="">
<blockquote type="cite" class="">After reboot DRBD starts before the zfs volumes that is use are available so I have to do a 'drbdadm adjust all’ each time. I’d like it to just wait until the zfs-mount.service is done.<br class="">
</blockquote>
<br class="">
Another question is whether that will actually be good enough to<br class="">
reliably start the DRBD resources. It may work sometimes, maybe even<br class="">
often, and then sometimes it may fail, because many of the base OS<br class="">
components such as udev, which makes various storage devices available,<br class="">
have countless race conditions. In other words, I suspect that the<br class="">
zfs-mount.service may finish successfully before the ZFS devices are<br class="">
actually usable or visible in the /dev filesystem.<br class="">
You may need to either add a delay (which still only increases the<br class="">
chance that it will work, but does not guarantee it) or add some custom<br class="">
programming to wait for the devices to be created in the /dev filesystem<br class="">
and to actually start working (e.g., try opening one and see whether<br class="">
that works).<br class="">
<br class="">
br,<br class="">
Robert<br class="">
<br class="">
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