SANRAD V-Switch manual Working with Scsi Storage Devices, Maintaining Cluster Communications

Working with SCSI Storage Devices

The V-Switch default SCSI bus ID is 7. If your storage cluster includes SCSI storage devices, one of the V-Switch’s default SCSI bus ID must be changed. They cannot both be 7 on the same SCSI bus. Use the CLI command pscsi set busid to change the SCSI bus ID on one of the V-Switches.

pscsi set busid

SWITCH PARAMETER DEFINITION STATUS EXAMPLE

-if	INTERFACE	STORAGE PORT	MANDATORY
		NUMBER/ALIAS
-id	ID	PSCSI ID NUMBER	MANDATORY
		BETWEEN 0 AND 15

pscsi3

12

Example

pscsi set busid if pscsi3 –id 12

Maintaining Cluster Communications

Once a V-Switch knows that it has a neighbor, it begins sending out a regular keep alive signal to its neighbor that it is on-line. The V-Switch also begins listening for the keep alive signal from its neighbor. The keep alive signal is transmitted through all connecting paths between each neighbor. Thus, if one path fails, the remaining path(s) will still carry the keep alive signal.

If a specified time period passes without a keep alive signal from the neighbor, a suspicious interval, measured in seconds, is entered. The V- Switch suspects that its neighbor has gone off-line and begins preparing to activate the neighbor IP addresses to take over volume exposure.

If a keep alive signal is received during the suspicious interval, the timer is reset and the V-Switch continues to function as usual. If a keep alive signal is not received by the end of the suspicious interval, a dead interval is entered. At the end of the dead interval, the neighboring V-Switch is considered off-line, the failover process is initiated and the on-line V-Switch actives the neighbor IP addresses and takes over volume exposure.

Use the CLI command cluster show to view the keep alive parameters of a cluster.

cluster show

Last Keep Alive	KeepAlive Int(s) Susp Int(s) Dead Int(s)
1	2	6	10

78 SANRAD V-Switch User Manual