Here is a simple procedure switching from a RDAC/fcparray management mode to a MPIO multipath mode for SAN disks presented from an IBM DSXX00 array.
Verification of the current monopath configuration:
# manage_disk_drivers
1: DS4100: currently RDAC; supported: RDAC/fcparray, MPIO
2: DS4300: currently RDAC; supported: RDAC/fcparray, MPIO
3: DS4500: currently RDAC; supported: RDAC/fcparray, MPIO
4: DS4700/DS4200: currently RDAC; supported: RDAC/fcparray, MPIO
5: DS4800: currently RDAC; supported: RDAC/fcparray, MPIO
Listing of the disks from the array:
# fget_config -vA
---dar0---
User array name = 'CUSTOMERSOFT'
dac0 ACTIVE dac5 ACTIVE
Disk DAC LUN Logical Drive
utm 127
hdisk7 dac5 6 beastie1_oracle
hdisk14 dac5 13 beastie2_datavg
hdisk15 dac0 14 beastie3_datavg
hdisk2 dac0 1 beastie3_rootvg
hdisk3 dac0 2 beastie4_rootvg
hdisk4 dac5 3 beastie5_rootvg
hdisk5 dac5 4 beastie2_rootvg
hdisk6 dac0 5 bakup
hdisk8 dac0 7 customer1
hdisk9 dac0 8 customer3
hdisk10 dac5 9 customer6
hdisk11 dac0 10 customer14
hdisk12 dac5 11 beastie2_db2
hdisk13 dac0 12 beastie3_scheduler
hdisk16 dac0 15 customer9
hdisk17 dac0 16 customer8
Listing of the disks as seen from the operating system:
# lsdev -Cc disk | grep DS
hdisk2 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk3 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk4 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk5 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk6 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk7 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk8 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk9 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk10 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk11 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk12 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk13 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk14 Available 02-00-02 1814 DS4700 Disk Array Device
hdisk15 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk16 Available 00-08-02 1814 DS4700 Disk Array Device
hdisk17 Available 00-08-02 1814 DS4700 Disk Array Device
Switch to a multipath management for the SAN volumes presented from the DS4700/DS4200 arrays:
# manage_disk_drivers -c 4
DS4700/DS4200 currently RDAC/fcparray
Change to alternate driver? [Y/N] Y
DS4700/DS4200 now managed by MPIO
It is necessary to perform a bosboot before rebooting the system in
order to incorporate this change into the boot image.
In order to change to the new driver, either a reboot or a full
unconfigure and reconfigure of all devices of the type changed
must be performed.
Reboot the system:
# bosboot –a
bosboot: Boot image is 39636 512 byte blocks.
# shutdown –Fr
[...]
Verification of the new multipath configuration:
# manage_disk_drivers
1: DS4100: currently RDAC; supported: RDAC/fcparray, MPIO
2: DS4300: currently RDAC; supported: RDAC/fcparray, MPIO
3: DS4500: currently RDAC; supported: RDAC/fcparray, MPIO
4: DS4700/DS4200: currently MPIO; supported: RDAC/fcparray, MPIO
5: DS4800: currently RDAC; supported: RDAC/fcparray, MPIO
Listing of the disks from the array:
# mpio_get_config -vA
Frame id 0:
Storage Subsystem worldwide name: 60ab80016253400009786efca
Controller count: 2
Partition count: 1
Partition 0:
Storage Subsystem Name = 'CUSTOMERSOFT'
hdisk LUN # Ownership User Label
hdisk0 1 A (preferred) beastie3_rootvg
hdisk1 2 A (preferred) beastie4_rootvg
hdisk2 3 B (preferred) beastie5_rootvg
hdisk3 4 B (preferred) beastie2_rootvg
hdisk4 5 A (preferred) bakup
hdisk5 6 B (preferred) beastie1_oracle
hdisk6 16 A (preferred) customer8
hdisk7 7 A (preferred) customer1
hdisk8 8 A (preferred) customer3
hdisk9 9 B (preferred) customer6
hdisk10 10 A (preferred) customer14
hdisk11 11 B (preferred) beastie2_db2
hdisk12 12 A (preferred) beastie3_scheduler
hdisk13 13 B (preferred) beastie2_datavg
hdisk14 14 A (preferred) beastie3_datavg
hdisk15 15 A (preferred) customer9
Listing of the disks as seen from the operating system:
# lsdev -Cc disk | grep DS
hdisk0 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk1 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk2 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk3 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk4 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk5 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk6 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk7 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk8 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk9 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk10 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk11 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk12 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk13 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk14 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk15 Available 06-08-02 MPIO Other DS4K Array Disk
hdisk16 Available 06-08-02 MPIO Other DS4K Array Disk
That’s it.