Mar 012012

We always use QLogic Fibre Channel Switches for our SAN installation. These switches have some options to increase throughput and decrease spikes during large file transfers, namely I/O Stream Guard and Device Scan.

It’s quite important to set this options correct for a good overall performance of the SAN regardless of the used software (XSan, metaSAN, HyperFS, …).

Here’s what you have to use:

Initiators (your clients)

I/O Stream Guard: Enabled
Device Scan: Disabled

Target (your RAIDs)

I/O Stream Guard: Disable
Device Scan: Enabled

Apple also posted a KB article a few years ago about this topic.

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