For what it's worth the STK devices we were using were VERY old. They dug up the
old dasd for our linux/390 Proof of Concept. Since our POC last year we have
finally migrated to newer hand me downs from the zOS folks. The devices we were on
then are no longer supported by STK though they were some kind of 9393's. The
point here is that performance on the old STK devices was better than the
relatively new SAN. Plus we had the benefits of detailed stats on I/O from ESAMON.
But the SAN is the corporate standard.
Linux/390 can do both.
David Andrews wrote:
> 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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