@stormi

I sent a PULL request to the fork source.
https://github.com/xapi-project/sm/pull/576

a573net opened this pull request in xapi-project/sm

closed QNAP product attribute is incorrect #576

I noticed that sr could not unplug after the NBD backup failed.

I'll blurt out the solution. There may be others out there, but I hope it helps someone.
I assume this is because when an NBD backup makes a vbd connection and exits with an error, the vbd connection is not broken.

# xe pbd-unplug uuid=79a53996-60d7-8fc0-1f8b-ba1e30b5d0ce
This operation cannot be performed because this VDI is in use by some other operation
vdi: 41b7ff1a-05be-43db-a592-849f9ab30444 (***************)
operation: 071e6f0b-9670-44b6-b455-b8d1319da28b (***************)

# xe vdi-param-list uuid=071e6f0b-9670-44b6-b455-b8d1319da28b | grep vbd-uuids
               vbd-uuids (SRO): 61a50e07-51c4-3476-d47c-45e756f127fe

Unplug the displayed vbd-uuids.

# xe vbd-unplug uuid=61a50e07-51c4-3476-d47c-45e756f127fe

@stormi, @olivierlambert

Thanks to everyone, I was able to complete it.
Thank you very much!!

Hello,

The QNAP setting in multipath.conf is incorrect. The settings cannot be called correctly because the product attribute is different. It seems to work with default values.

I will feed back my experience to XCP-NG project.

product attribute - [Underbar is incorrect. Space is correct]

/etc/multipath.xenserver/multipath.conf.old

device {
                vendor                  "QNAP"
                product                 "iSCSI_Storage"
        }

/etc/multipath.xenserver/multipath.conf

device {
                vendor                  "QNAP"
                product                 "iSCSI Storage"
        }

I was editing multipath.conf to give priority to multipathing sessions.
I started debugging because the settings didn't apply. You have noticed a difference in the call string "iSCSI Storage".

[16:30 xxxxxxxxx etc]# multipath -ll
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx dm-0 QNAP    ,iSCSI Storage   
size=20T features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=9 status=active
| `- 9:0:0:0  sdb 8:16 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 10:0:0:0 sdc 8:32 active ready running

By replacing the underscore with a space, the setting is now recognized correctly and the session can be given priority.

device {
                vendor                  "QNAP"
                product                 "iSCSI Storage"
                path_grouping_policy    "failover"
                path_selector           "round-robin 0"
                path_checker            readsector0
                prio                    weightedpath
                prio_args               "hbtl 9:0:0:0 9 10:0:0:0 1"
                uid_attribute           ID_SERIAL
        }

My Storage: TS-432PXU-RP
Version: 5.0.0.1828 Build 20211020