MULTIPATH made easy

Deducting Shelves

Not able to deduct newly attached shelves:

        slot 0: Fibre Channel Target Host Adapter 0c

        slot 0: Fibre Channel Target Host Adapter 0c

Make sure you enable the Fibre channel host Adapter.

fcadmin config -t initiator 0c

fcadmin config -t initiator 0d

you need a REBOOT for the changes to take effect and the disk shelves will be recognised by the filers.

Multipathing on Filers

All the filers in our environment are multipathed. Requirement of Multipathing:

System requirements

Multipath storage for active/active configurations is available only on the following storage system models:

FAS900 series
FAS2020 and FAS2050 systems
FAS30xx series
FAS3140 and FAS3170
FAS6000 series
SA200
SA300
SA600

Active/active configuration-type requirements

Multipath Storage is available for the following types of active/active configurations:

· Standard active/active configurations
· Mirrored active/active configurations
· Stretch Metro Clusters

Your active/active configuration must be installed and fully operational. Your configuration testing should include successful failover and giveback.

Note: Fabric-attached MetroClusters have redundant disk paths by default; no special configuration is necessary.

Disk shelf requirements

Multipath Storage for active/active configurations is available for only the following combinations of disk shelves and modules:

DS14mk2 FC or DS14mk4 FC disk shelves with ESH2 or ESH4 modules
DS14mk2 AT disk shelves with RoHS-compliant AT-FCX modules


Best practice recommendation

If any loop in your active/active configuration is cabled for Multipath Storage, every loop should be cabled for Multipath Storage. This is the recommended best practice.

Note: If you have a mixed configuration in which some loops are cabled for Multipath Storage and some are not, the system displays a configuration error message when you boot the system or when a disk on a loop that is cabled for Multipath becomes single-pathed.