Hello,
One initiator is accessing 2 TGT instances on 2 hosts where the same
block device is shared among them (actually an RBD volume). The
configuration is as follow:
TGT1:
<target iqn.2017-08.storage:rbd0-1>
direct-store /dev/rbd0
write-cache off
</target>
TGT2:
<target iqn.2017-08.storage:rbd0-2>
direct-store /dev/rbd0
write-cache off
</target>
On the initiator, when multipath is configured with
'path_grouping_policy "multibus"' and formated in ext4, the fsck fails
systematically. The output of "multipath -ll" in the MP device :
360000000000000000e00000000010001 dm-17 IET,VIRTUAL-DISK
size=93G features='1 retain_attached_hw_handler' hwhandler='0' wp=rw
`-+- policy='service-time 0' prio=1 status=active
|- 11:0:0:1 sds 65:32 active ready running
`- 12:0:0:1 sdt 65:48 active ready running
I not some errors when tgt start :
read capacity (16): pass through os error: Inappropriate ioctl for device
READ CAPACITY (16) failed: Sense category: -1, try '-v' option for more
information
I cannot reproduce this issue with 'path_grouping_policy "failover"',
nor whit LIO as iSCSI target and 'path_grouping_policy "multibus"'. On
TGT hosts, the rbd cache is disabled ("rbd cache = false").
Did I miss something ? Any enlightenment in order to debug further will
be welcomed.
Debian Stretch
kernel 4.9.65
tgtd 1.0.69
multipath-tools 0.6.4
open-iscsi 2.0-874
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