RE: Old Topic I'm Sure

["Roy Luce" <lwl@xxxxxxxxxxxxx>]

Tom:

In the three shift operation mode the value of a mirrored disk configuration
can not be over stated.

In the way of background:  In a mirrored disk environment the software
responsible for the disk writes records to 2 spindles simultaneously,
mirroring the live files.  At some point the mirror-ing operation is
discontinued, tape backups are performed and the mirroring resumed.  When
resumed the mirroring process "catches up" with the live updates and then
remains in sync until the mirror is broken again.

Mirrored disk subsystems require specialized software and generally come
from third parties.  Datafort is one supplier, IBM supplies Shark disks
arrays and of course EMC has the capability.  I don't know if any of these
suppliers work with the AS400/iSeries machines.

For more than you'd ever want to know do a Google search on "Mirrored disk".


Roy Luce

Main:   847-540-9635
Cell:   847-910-0884
Fax:    208-330-9032
Email:  lwl@ix.netcom.com

-----Original Message-----
From: mapics-l-admin@midrange.com [mailto:mapics-l-admin@midrange.com]On
Behalf Of Shrader, Patrick
Sent: Tuesday, October 29, 2002 11:25 AM
To: mapics-l@midrange.com
Subject: RE: Old Topic I'm Sure

Tom,

Speaking as someone who just finished a complete reload of my system due to
a failed hard drive, I was very thankful that I have daily backups. Just
this weekend, after 38 hours of restore time, we only lost ten minutes worth
of transactions (thankfully).

3 shift operations come to a complete halt when the system is down. I
suggest that you immediately install a high-availability system (MIMIX or
similar) or schedule some downtime to get a good save on a regular, and
frequent, basis.

Patrick


-----Original Message-----
From: Tom Wood [mailto:TomW@fortrecoveryindustries.com]
Sent: Tuesday, October 29, 2002 10:45 AM
To: mapics-l@midrange.com
Subject: Old Topic I'm Sure


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All,



I apologize if this is an old topic, but what are those of you doing for
reliable nightly MAPICS or other data backups for 3-shift operations, with
no offshift systems support?  Currently, I only do a MAPICS backup weekly
and a library backup nightly ... however during my nightly backups some
files are skipped because they are in use.  This is an area I have been
somewhat lax in and need to get better before I get stung.



Any suggestions/hints are appreciated.



Tom

IS Manager

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