Ubuntu
bcache-tools package

  1. Bug #1887558
  2. Comment #17

Comment 17 for bug 1887558

Revision history for this message
Christian Ehrhardt  (paelzer) wrote : Re: Multipath JBOD storage devices are not shown via /dev/mapper but each path as a single device.

Hey,
Thorsten was so kind to reach out and ask for help, this is a tricky situation.

The issue seems to be outlined, of bdev udev rules being greedy and grabbing all devices before multipath service kicks in.

Sadly there isn't a great proposal or solution yet.
Nor have I read about an easy way to reproduce.

Discussions seem to happen in MM ~maas-bcache-tools-jbod-multipath-bug but I haven't joined that yet.

In regard to testing I'd expect a modified variant of my multipath/tgt autopkgtest should work using iscsi to create multiple paths to the same disk - which we then can set up as bcache and check the behavior (without having full systems deployed via maas).

tagging it for server team to have a look but until there is a breakthrough to find an approach I'm unsure about progress expectations.