HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)

• Ensure that all router are conﬁgured correctly .

• Contact your service provider to check if the circuit has been alternate routed.

• Check to see if thrashing occurs during peak times and not during low volume times. If so, the

circuit may be over subscribed and you may need to increase bandwidth.

NOTE:

An informational event (c22000c) is generated for an open tunnel. No action is required.

Long delays or time-outs on HP–UX

If an HP–UX host has multiple disk devices with failed or no longer presented LUNs behind them, it can

take an increasingly long time to gather host information as the number of disk devices increases. If

an HP–UX host exhibits time-outs on host discovery or failed jobs while waiting for host operations to

complete, take the following actions:

• Check the disk devices showing long time-outs. Secure Pa th can display the status of the disk

devices it is managing. For disk devices not managed by Secure Path, check for I/O time-outs by

running an OS tool such as diskinfo on each disk device.

Remove any disk devices that show long time–outs, if they are no longer needed.

• If the disk devices are intentionally in this state, improve performance by modifying the I/O

time-out set ting for those disks with the pvchange –t command. HP–UX has a default I/O

time-out of 30 seconds for SCSI disks. The pvchange –t command allows you to reduce the

amount of time before a tim e– out on a given disk occurs. Reducing the time–out decreases the

amount of time a host discovery takes.

HP StorageWorks Continuous Access EVA administrator guide