Hi,
I'd like to follow up with discussion about concurrent usage iscsiadm tool. It 
was discussed here about year ago, with suggestion not to use it concurrently 
[1]. On the other hand, comment [2] says it should be fine. Is the an agreement 
in open-iscsi community if the concurrent usage of iscsiadm is safe or not? If 
it's not safe, is there any bug for open-iscsi describing the issue and 
potential problems if iscsiadm is used concurrently?

The motivation why I'm popping up this again is that in oVirt project [3] we 
use a lock before calling iscsiadm to make sure it's not run in parallel. This 
causes us various issues (see e.g. BZ #1787192 [2]) and we'd like to get rid 
off this lock.

I run several thousands tests with our typical usage of iscsiadm [4], running 
iscsiadm in parallel and haven't spot any issue so far. This suggests removing 
the lock can be safe, but of course my tests could be just a pure luck. So 
before removing this lock from our code base, I'd like to know your thoughts 
about it.

Thanks
Vojta

[1] https://groups.google.com/g/open-iscsi/c/OHOdIm1W274/m/9l5NcPQHBAAJ
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1787192#c18
[3] https://www.ovirt.org/
[4] https://github.com/oVirt/vdsm/blob/master/tests/storage/stress/
initiator.py

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