Manual Failover; Failover As Temporary Move - HP StorageWorks SR2122 User Manual

Maintaining and Managing the Storage Router
Note:
instance does not occur.
Each cluster supports up to 12 active SCSI routing instances. Since each storage
router can also support up to 12 SCSI routing instances, high availability is
ensured for each instance in the cluster (regardless of the division of those
instances between storage routers).

Manual Failover

While failover of SCSI routing instances is automatic, there may be times when
you wish to manually move a SCSI routing instance from one storage router to
another. The move may be temporary, after which the instance will be moved back
to its original location. At other times, you may want to move a SCSI routing
instance permanently to another storage router, ensuring that the instance will
continue running on the specified storage router whenever possible.
As an example cluster scenario, a cluster is composed of two storage routers,
StorageRouterSys1 and StorageRouterSys2. StorageRouterSys1 is currently
running instances, scsi1 and scsi2, and is the primary storage router for both
instances. StorageRouterSys2 is currently running instances, scsi3 and scsi4. The
primary attribute for scsi3 and scsi4 is set to the default setting of none, indicating
no preferred storage router for failover for either instance.

Failover as Temporary Move

Referring to the example cluster scenario just described, the following procedure
moves the SCSI routing instance, scsi1, from its primary, or preferred, storage
router, StorageRouterSys1, to the other storage router on a temporary basis. The
commands in this procedure are issued from a CLI session from storage router,
StorageRouterSys1.
1. enable — Enter Administrator mode.
2. show cluster or show scsirouter scsi1 stats — Verify
3. failover scsirouter scsi1 — Failover SCSI routing instance,
192
If some targets are available but others are not, failover of the SCSI routing
that the instance to be moved, scsi1, is indeed running on storage router,
StorageRouterSys1.
scsi1.
IP Storage Router SR2122-2 User Guide