Map In Use Multipath
Rhel Multipath Map In Use
(FC on Red Hat Enterprise Virtualization Hypervisor 6.2) The output looks similar to the following when you have ALUA enabled and are using Red Hat Enterprise Virtualization Hypervisor 6.2: # multipath -ll36b5a776b3f2d7035505a6f dm-0 NETAPP,LUNsize=60G features='3 queueifnopath pginitretries 50' hwhandler='1 alua' wp=rw -+- policy='round-robin 0' prio=50 status=active - 4:0:0:0 sda 8:0 active ready running `- 5:0:0:0 sdc 8:32 active ready running`-+- policy='round-robin 0' prio=10 status=enabled - 4:0:1:0 sdb 8:16 active ready running`- 5:0:1:0 sdd 8:48 active ready running. (iSCSI and clustered Data ONTAP) If the storage system is running clustered Data ONTAP and using iSCSI, the output looks similar to the following: # multipath -ll366676c703f2d6c36506138 dm-0 NETAPP,LUN C-Modesize=25G features='1 queueifnopath' hwhandler='1 alua' wp=rw -+- policy='round-robin 0' prio=50 status=active `- 8:0:0:0 sdc 8:32 active ready running`-+- policy='round-robin 0' prio=10 status=enabled - 9:0:0:0 sdd 8:48 active ready running - 7:0:0:0 sdb 8:16 active ready running`- 10:0:0:0 sde 8:64 active ready running. (iSCSI on Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 11 SP1 or later) The output looks similar to the following when you are using iSCSI with either Red Hat Enterprise Linux 6 or SUSE Linux Enterprise Server 11 with SP1 or later: # multipath -ll3334b63326f37 dm-3 NETAPP,LUNsize=9.0G features='1 queueifnopath' hwhandler='0' wp=rw`-+- policy='round-robin 0' prio=2 status=active - 4:0:0:1 sdc 8:32 active ready running`- 3:0:0:1 sdb 8:16 active ready running. To check what DM-Multipath settings arecurrently in use on a Linux host, you must run the followingcommands.
Multipath Effect
New 'remove retries' multipath configuration value If a multipath device is temporarily in use when multipath tries to remove it, the remove will fail. It is now possible to control the number of times that the 'multipath' command will retry removing a multipath device that is busy by setting the 'removeretries' configuration value.