From: admin <vondra@homeatcloud.cz>
To: linux-hotplug@vger.kernel.org
Subject: Dangling UDEV links after removing FC LUNs
Date: Sat, 03 Dec 2016 16:20:05 +0000 [thread overview]
Message-ID: <20161203162005.Horde.7B1kAhbyMfoGECiY5wzO_1J@owncloud.homeatcloud.cz> (raw)
Dear list,
we're using Q-Logic QLE2562 Fibre Channel adapters (qla2xxx driver) against a HPE 3PAR 7400c storage array in an OpenStack environment. The OpenStack 3PAR driver manages volume attachments from the array to the servers. There is 4 path multipath to every volume.
As the LUNs are removed, sometimes udev does not remove all links, particularly in /run/udev/links and /dev/disk/by-path. The symptoms are multiple records in one by-path directory under /run/udev/links, broken links to no longer attached luns in dev/disk/by-path and links between wrong LUNs and scsi devices there. I'm getting "multipathd: udev trigger error" in syslog.
OpenStack relies on these links. When another volume is attached using a LUN that has these leftover links and it happens that it is the first of the 4 paths, OpenStack incorrectly identifies the volume and attaches the same volume to multiple instances, leading to data loss.
What could be causing this behavior?
Ubuntu version 14.04
Linux version Ubuntu 4.4.0-47.68~14.04.1-generic 4.4.24
udev 204-5ubuntu20.19
Thanks for any troubleshooting tips, Tomas Vondra
next reply other threads:[~2016-12-03 16:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-03 16:20 admin [this message]
2016-12-03 17:14 ` Dangling UDEV links after removing FC LUNs Greg KH
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