Hi!
Here are some tips that I received this week from a StorageTek Engineer.
The final recommendation for server size that he made was the same that the
Tivoli Engineer had provided without having to go through the entire
exercise of tracking all servers, their disk size requirements, databases,
etc.
The official rule of thumb on sizing is 10Mhz for per each MB/sec's for the
backup solution. So if you had 10 9840B's drives (each with native transfer
rate of 19 MB's) and had the network matched on the front end to match the
required data rate that would equal 190MB/sec. I assume 2:1 compression
which would then be 380 MB/sec or 3800Mhz of Cpu. Just remember this is to
build so there isn't a bottleneck, having less will work, but you wont get
the best performance that is possible. Usually the network is a limiting
bottleneck like GB ethernet is about 60 MB/sec and if you only have one, it
doesnt matter how many tape drives I have because the best rate I can get
to
the drives is 60MB/sec or 600 Mhz worth of CPU's.
Brenda Collins
ING - Americas Infrastructure Services
(612) 342-3839 (Phone)
[EMAIL PROTECTED]
"Farren Minns"
<fminns@WILEY. To: [EMAIL PROTECTED]
CO.UK> cc:
Sent by: Subject: TSM and Capacity Planning
"ADSM: Dist
Stor Manager"
<[EMAIL PROTECTED]
IST.EDU>
04/09/2002
10:56 AM
Please respond
to "ADSM: Dist
Stor Manager"
Hello again TSMers
I am currently in the process of preparing a capacity planning document for
our TSM set-up so that I can at least try to estimate when our Server will
become pushed to its limits.
I was wondering who else has done this recently and if there are any good
sources of inf. on the net that may be of help to me.
At the moment we have TSM Server 3.7.3.8 running on a Sun Solaris E250
(400Mhz, 1GB memory). We have 28 client running on Solaris, OS/2, NT and
one Linux for good measure. We have one 3494 tape library housing two 3590
tape drives (J Tapes - 20Gb compress, 10 uncompressed).
I can easily work out approx. how many tapes we are going to need; how much
free space we have in the library; how much disk space we may need for the
database, log etc. But the thing I need help with is figuring out how much
client data we can back up within a certain window. All clients seem to
have different rates at which they can process data; some machines are
remote; some use compression etc. etc. etc. I'm am quite new to this and
would be interested in other peoples experiences in doing this kind of
thing.
I guess there are so many questions that to sit here and type them all
would be foolish. I'm more interested in finding out what the crucial
questions I should be asking are (are you still with me, I know I'm
rambling now).
Also, I'm interested in learning more about the tuneable parameters within
TSM (Server and Client); what sort of things I could do to improve data
throughput, database performance, tape performance etc.
Basically, any help, pointers etc regarding this type of thing would be
very much appreciated.
Thanks very much
All the best
Farren Minns - Trainee Solaris and TSM system admin
John Wiley & Sons
