User guide

10. KNOWN ISSUES

10.1 RHEL5X/SLES10X

10.1.1 INFINIBAND SCSI DEVICES THAT DISAPPEAR AND COME BACK ARE NOT ADDED TO

MULTIPATH DEVICE MAPS (INFINIBAND ONLY)

Description:

IBSRP changes the host number of the SRP host thereby causing the sysfs path of the device to

change. For example LUN 13 = host:bus:target:lun = 6:0:0:13 before the paths fail and then

LUN 13 = 7:0:0:13 after the paths come back. Multipath caches the sysfs entries for devices to

prevent repeated path lookups. When a device disappears and then comes back with a

different host, multipath tries to look up the device using cached (and now incorrect) path.

Hence multipath fails to add the device-to-device map.

Solution (RHEL5x):

Install updated multipath provided by RedHat. Multipath >= 0.4.7-46 fixes this problem.

Workaround (SLES10x):

Manually trigger multipath to reload dev maps by either issuing multipath -r or multipath

<device-WWN>.

10.2 SLES 10X

10.2.1 CERTAIN MULTIPATH COMMANDS COMPLAIN ABOUT DEPRECATED PRIO_CALLOUT

Description:

Certain versions of multipath print the following warning:

Using deprecated prio_callout '/sbin/mpath_prio_sfa10k /dev/%n' (controller setting)

Example:

360001ff077548000000000db8e400019 dm-9 DDN,S2A 6620

[size=16G][features=1 queue_if_no_path][hwhandler=0]

\_ round-robin 0 [prio=100][enabled]

\_ 6:0:0:25 sdae 65:224 [active][ready]

sdaj: Using deprecated prio_callout '/sbin/mpath_prio_alua /dev/%n' (controller setting)

Please fixup /etc/multipath.conf

Workaround:

Ignore the warnings.