RE: CACHE BATT EXP 90 DAYS???

Mirroring was introduced on the "D" series with V1R3.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

"i" comes before "p", "x" and "z"
e gads

Our system's had more names than Elizabeth Taylor!

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com
http://www.as400connection.com




"Chuck Lewis"
<chuck.lewis@lees
upply.net> To
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06/04/2007 02:40 Subject
PM RE: CACHE BATT EXP 90 DAYS???


Please respond to
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Ah, the days of mirroring. We had a great system like that a LONG time ago
where I used to work. I think it was on a F series AS/400 of memory serves
and it saved our butts a couple of time. But that ended up going away and
to
RAID on an upgrade where cold hard $$$'s were involved. I never felt as
confident after that :-)

Chuck

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Larry Bolhuis
Sent: Monday, June 04, 2007 2:22 PM
To: Midrange Systems Technical Discussion
Subject: Re: CACHE BATT EXP 90 DAYS???

We are seeing large systems go to Mirroring more and more but even some
small systems. The problem of course is that as you increase the number
of loops, buses, cards, power supplies and drives you statistically
increase the chances of a failure. It's also normally true that the
larger the system the more people there are that depend on it and
therefore the cost for it to be down is higher. So it becomes more and
more important to mirror (correctly I might add!) than to RAID your
disks as the systems get larger. You don't reduce the chance of a
failure but you reduce the chances that a failure will hurt. Poorly done
mirroring only costs you more hardware and affords little additional
protection.

- Larry

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