Re: [foxboro] Convert a Foxboro P91 Server from a P91 Dell Power Edge 2800 to a new Dell Power Edge 2900
- From: Corey R Clingo <corey.clingo@xxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 24 Feb 2009 07:46:33 -0600
I'm curious -- with any of these solutions, is there any concern about
consistency of the backups when doing them online? I see 2 potential
issues:
1. Single-file inconsistency -- files being backed up while being written,
leaving the backup copy corrupt. Windows has Volume Shadow Copy for this,
but I believe applications have to be written to take advantage of it (and
I'm guessing most of Foxboro's aren't).
2. Multiple-file inconsistency -- one file not "matching" another file
because they were backed up at different times while an application using
both of them was writing to them.
The scary thing about this to me is that it may only bite you 1 time in
100. It must still be an issue for some, as some (large) applications we
use that are constantly writing data to disk have "write pause" or
buffering options to allow you to run backups on consistent file sets.
Corey Clingo
BASF Corp.
"Larsen, Ed" <ed.larsen@xxxxxxxxxxxxxxxx>
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02/19/2009 08:21 PM
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Re: [foxboro] Convert a Foxboro P91 Server from a P91 Dell Power Edge 2800
to a new Dell Power Edge 2900
Tom,
Your synopsis is correct. Although on rare occasion it would be
convenient to backup a box without loading the backup software, it
hasn't been an issue for me.
All of the Invensys P90, P91, and P92 come with the Dell restore cd. One
of the first things I do on the boxes we receive is to make sure BESR is
installed. Configure it to back up to our servers and I never worry
about it being backed up again. Operators never even know the backup is
being made.
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