Quantum Scalar i500 Betriebsanweisung PDF herunterladen (Seite 173)

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Chapter 6 Storage Networking

Configuring Data Path Failover

Scalar i500 User’s Guide 154

Configuring Data Path Failover

Data Path Failover provides an alternate data path when a preferred data

path fails. The Data Path Failover functionality is provided as part of the

Storage Networking license and applies to HP LTO-5 Fibre Channel tape

drives only.

HP LTO-5 Fibre Channel tape drives have two Fibre Channel ports. If you

enable data path failover on the tape drive, one port will be used as the

“active port” for data transmission, and the other port will stand by to be

used if the active port fails. If the tape drive loses its Fibre Channel link

with the active port, it will automatically “fail over” and use the standby

port to continue drive operations. The library issues a RAS ticket when

automatic failover occurs. In addition, the library monitors the standby

port and issues a RAS ticket if the standby port does not report a good

Fibre Channel link status.

The library uses Port 1 for data path transmission unless a failover occurs.

Once failover occurs, the library uses Port 2 until failover occurs again or

the library is rebooted. Similarly, if a tape drive configured for data path

failover is the control path for a partition, the host uses Port 1 for media

changer commands unless a failover occurs. Once failover occurs, the

host uses Port 2 until failover occurs again or the library is rebooted.

A tape drive can be configured for both data path failover and control

path failover. If both are configured, the control path will not fail over to

another tape drive unless both ports on the control path tape drive fail.

If desired, you can manually switch the active port (see Forcing Data Path

Failover on page 157).

Note: Performing a drive reset operation is another way to make

Port 1 the active port again, unless the reason Port 2 is active is

due to a forced failover (see Forcing Data Path Failover

page 157). If you forced a failover to Port 2 and then reset the

tape drive, the library and host will continue to use Port 2 until

failover occurs again or the library is rebooted.

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