2010/7/20 Wahyu Darmawan <[email protected]>:

> The question is, Why should use IBM RDAC for multipath in my RHEL 4

Because your storage vendor told so.

If your question is: "why I need to use an external driver and not the
one provided by Red Hat?" I could speculate that is because you are
using an active/passive configuration (I don't know if the DS4700 is
an active/active or not) and Red Hat 4.x multipath cannot deal with an
active/passive.

> and why
> HP Blade + HP EVA Storage don't use any addition plugins software to keep
> server + storage connection?

More or less the same. With an MSA1000, my only available option was,
some years ago, to upgrade the firmware to a 7.0 release (or
something), which supports an active/active controller; otherwise with
an RHEL 4.x host, I have no option but using the HP provided drivers.

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