summary -- raid advice

From: Doggy \(tru64\) (tru64dog@yahoo.com)
Date: Thu Jul 04 2002 - 19:27:52 EDT


thanks to the following for their expertise:
Chris Bryant
BrianH@dice.com
Ballowe, Charles
mike broderick
Greg Freemyer
Colin Bull
LHERCAUD@ bouyguestelecom.fr

All gave excellent advice, but I want to point out the
benefits of LSM as
described by Alan
==============================
alan@nabeth.cxo.cpqcorp.net
 

        The main value that LSM brings to such a
configuration is
        the ability to mirror across multiple I/O subsystems.
 That
        removes a particular I/O subsystem as being a single
point
        of failure. With only the HSZ50 subsystem, that's
not a
        useful option. If I/O load is an issue (as opposed
to
        I/O availability), then you should create a 2nd or
even
        3rd Mirror on the HSZ50 and use LSM to stripe the
data
        among units. This may be useful if you have a pair
of
        redundant controllers and distribute the load among
the
        pair. It would probably take a benchmark to be find
out
        for sure if LSM striping is a benefit over controller
        striping.

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