On Tue, 2004-05-11 at 15:03, Stephen Frazier wrote:
> Over the years since there first pure RAID-5 box STK has made many
> incremental improvements.
You must be thinking of something else. STK discontinued the Nordique
("pure RAID-5 box") for ESCON a very long time ago.
> The improvements have been in the areas of
> reliability by adding additional parity to the original RAID-5. The
> compression algorithms that they added have helped capacity.
The compression feature is part of the Log-Structured-File (LSF) system,
and is not a bolt-on for RAID-5. LSF makes this and other things
possible, such as snapshot copy and virtual volumes. One of my favorite
little pluses is what the marketing guys call "self tuning" -- you don't
have to worry anymore about volume placement and hot array drawers. The
subsystem handles it.
My point throughout is that LSF is a *very* different beast from one's
garden-variety RAID box, and that referring to STK DASD as "RAID-5" is
little more descriptive than saying it contains hard drives.
--
David Andrews
A. Duda and Sons, Inc.
[EMAIL PROTECTED]
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