Our change rate on email servers averages about 33% daily. We use
Groupwise, so I don't know if that's the difference, or if our users
just don't email as heavily.
Troy Frank
Network Services
University of Wisconsin Medical Foundation
608.829.5384
>>> rogerd AT UIC DOT EDU 6/4/2004 12:43:49 PM >>>
I'm going to post this to the whole list, because it is so dramatic.
The
only question that matters here is, "Is it an email inbox? yes or no."
If the answer is Yes, the daily change rate approaches 100%.
Roger Deschner University of Illinois at Chicago rogerd AT uic DOT edu
On Fri, 4 Jun 2004, Steve Harris wrote:
>Hi All,
>
>I'm trying to size TSM servers for some small remote sites that we
have. In the past, with more primitive products, one of the issues has
been getting staff in these locations - generally nurses - to physically
change tapes. For that reason, and to avoid the cost of a library, I'm
looking at a disk primary pool and tape copypool, with db back ups up
the wire to a "mother" site.
>
>I've written a program that models the TSM backup and expiry process.
Some assumptions are a small daily update rate, but a file changed
yesterday is 50% likely to be changed today and 25% if it was changed in
the last week. I realize in the real world that there are weekly and
monthly cycles too, but I've left them out for the model for
simplicity.
>
>With a 1% daily change rate, 35 day retention and no compression, I'll
need 5.7 times the original data space (thats steady state average +3
standard deviations), but the number is quite sensitive to the daily
rate of change
>
>1% 5.7
>1.25% 6.5
>1.5% 7.1
>1.75% 7.9
>2% 8.6
>2.5% 9.8
>3% 10.7
>5% 13.2
>10% 16.9
>
>At the moment, I don't back up any File servers, so I have no idea
what a usual rate of change might be.
>
>First, can anyone comment on my assumptions.
>
>Second, can anyone share change rates for file servers with a normal
load of office workers creating word processing docs, spreadsheets, etc.
I understand that Netware changes attributes in situations where Windows
does not, so if you could say which type of OS you are using that would
be handy too.
>
>Rather than flood the list, email direct to me at
steve_harris AT health.qld.gov DOT au and I'll summarize.
>
>
>Thanks
>
>Steve Harris
>AIX and TSM Admin
>Queensland Health,
>Brisbane Australia
>
>
>
>
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