filer> lun stats -o -i 1 -c 1 Read Write Other QFull Read Write Average Queue Lun Ops Ops Ops kB kB Latency Length kB 0 2 0 0 0 8 0.50 2.00 0 0 /vol/Vol01/LunA 2 2 0 0 8 8 6.50 2.00 /vol/Vol02/LunB 7 2 0 0 28 8 19.00 1.03 0 0 /vol/Vol03/LunC
This command lists all volumes on the filer and how many ops are processed. One of the columns is called "Partner Ops". If this columns has any number higher than 0 it means that this Lun is receiving data over the wrong filer head and that all data is transferred over the Interlink cable (the one that syncs the nvram of the cache card in the cluster heads). You can resolve this by installing or updating the "host utilities" and/or "the MPIO and letting this tool configure the multi-paths to this storage.
filer> sysconfig -v 2 slot 2: Fibre Channel Target Host Adapter 2a (Dual-channel, QLogic 2432(2462) rev. 2, 64-bit, <ONLINE>) Firmware rev: 4.5.2 FC Nodename:(bb0a098087297fbb) FC Portname: bb:0a:09: :97:29:7f:bb (bb0a098197297fbb) Connection: PTP, Fabric slot 2: Fibre Channel Target Host Adapter 2b (Dual-channel, QLogic 2432(2462) rev. 2, 64-bit, <ONLINE>) Firmware rev: 4.5.2 FC Nodename: (bb0a098087297fbb) FC Portname: bb:0a:09: :97:29:7f:bb (bb0a098297297fbb) Connection: PTP, Fabric
Both "FC Nodename" WWN IDs have the same number (in blue) and the "FC Portname" only differentiate one number with each other (in red). In a Multi-path configuration the only way to differentiate a FC path to a Lun is by looking at the "FC Portname" number.