[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]
** Changed in: nova
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1414865
Title:
Lost the sd* devices which belong to the multipath device.
Status in OpenStack Compute (Nova):
Expired
Bug description:
tested environment:
iscsi_use_multipath=True and iscsI volume backed is ZTE KS3200.
The nova compute note connects to KS3200 with four ports. And launch an
instance which boots form a volume.
I see there are four sd* devices belong to the multipath device
"/dev/mapper/mpathc".
[root@opencos170 ~]# multipath -ll
mpathc (3600000e00d280000002800e2000c0000) dm-3 FUJITSU ,ETERNUS_DXL
size=1.0T features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 25:0:0:1 sdf 8:80 active ready running
| `- 24:0:0:1 sdi 8:128 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
|- 22:0:0:1 sdh 8:112 active ready running
`- 23:0:0:1 sde 8:64 active ready running
I disconnect one port of KS3200. And attach a volume to the instance.
Then I see the sdi device lost. There are only three sd* devices.
[root@opencos170 ~]# multipath -ll
mpathc (3600000e00d280000002800e2000c0000) dm-3 FUJITSU ,ETERNUS_DXL
size=1.0T features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 25:0:0:1 sdf 8:80 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
|- 22:0:0:1 sdh 8:112 active ready running
`- 23:0:0:1 sde 8:64 active ready running
I connect the KS3200 port,but the sdi device never appear.
After a lot of repetition of failure,I found the reason is the command
"multipath -r".
If the link between the compute note and the zte KS3200 is broken, the sd*
device lost after execute the command "multipath -r".
If the link is ok, the sd* device appear after execute the command "multipath
-r".
Is the command "multipath -r" necessary when attaching or detaching
volume. Whether can be removed?
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