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Isolating problems in a multi-operating system environment

We have a storage subsystem Compaq (now Hewlett-Packard) RA8000, which is connected to few HP Unix mission-critical servers through a Compaq 7 port SAN hub. In addition, we have a Windows 2000 machine attached to the same storage subsystem, though not through the hub. It's connected directly to the HSG80 controller of RA8000.

In the past few days, we have started having problems on one of HP Unix machines. The system becomes unresponsive and fails to give access to any volumes configured on the storage system. After we restart, the problem resolves for a while, but then crops up again.

Please let me know if there are any known issues with this architecture, or any possible solutions to our situation.

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First, dump the hub and get a switch. That will help with isolation and with performance. Next, examine your configuration and must sure you've got the Selective Presentation Manager run to set it up correctly. This is a LUN manager that assigns LUN masking and allegiance to identify which servers and see which volumes. Yes, they can resource share, just set it up correctly.

This was first published in July 2004

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