Specifications

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Cisco SN 5428-2 Storage Router Software Configuration Guide
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Chapter 11 Maintaining and Managing the SN 5428-2 Storage Router
Controlling SCSI Routing Instances in a Cluster
• Some mapped targets are unavailable and all mapped targets are available on another storage router
in the cluster.
• All mapped targets are available, but another storage router in the cluster also has all targets
available and is designated at the primary for the SCSI routing instance.
• The storage router stops receiving heartbeats from another storage router within the cluster.
Note If you need more manual control over where a SCSI routing instance runs, you can turn off failover by
eligibility on a storage router. If a SCSI routing instance fails over to a storage router that is configured
with failover by eligibility turned off, it will continue running on that storage router unless there are no
mapped targets available or a critical resource is unavailable. Normal failover resumes when failover by
eligibility is turned back on for the storage router where the SCSI routing instance is running.
The show scsirouter all failover command (Example 11-9) displays target and resource availability
associated with each storage router in the cluster. The show ha all command (Example 11-10) displays
the status of the failover by eligibility feature.
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).
Example 11-9 Results of “show scsirouter all failover” Command
[SN5428-2A]# show scsirouter all failover
Each [ ] contains node operating characteristics for a scsirouter.
[Instance status, Failover Priority, Eligibility]
Instance Status('M' = Master, ' ' = Slave)
Failover Priority(' ' = none, 'fp' = primary, 'fs' = secondary)
Eligiblity(U = Eligibility has not been initialized
N = None of the configured devices are available or
a configured interface is unavailable
S = Some of the configured devices are available
A = All of the configured devices are available
P = Primary and all of the configured devices are available)
Configured Configured
Configured Failover Failover This Failover
Scsirouter Primary Primary Secondary Node Node List
---------- ---------- ---------- ---------- -------- ----------------
jb1 SN5428-2B none none [ N] [M A]SN5428-2B
jb2 none none none [ A] [M A]SN5428-2B
pad1a none none none [M A] [ S]SN5428-2B
pad1b SN5428-2A none none [M A] [ S]SN5428-2B
pad2a SN5428-2B none none [ S] [M A]SN5428-2B
pad2d SN5428-2B none none [ S] [M A]SN5428-2B
pad3a SN5428-2A none none [M A] [ N]SN5428-2B
Example 11-10 Results of “show ha all” Command
[SN5428-2A]# show ha all
System Name Configuration Status MGMT HA Failover By Eligibility
SN5428-2A CLUSTERED up up up on