I knew I should have included more details the minute after I hit send.
Our current problem is that our DLT 7000's can not migrate data fast enough
to keep our disk pools filling, even with multiple migration processes
running. So we are getting an IBM 3584 with LTO drives. At that point I
hope to get the 10 - 12 MB/s that I get as the pools fill.
>From that point we will add the Gigabit connections.
Thanks for the note about the Intel box getting 25MB/s, that gives me some
sort of realistic expectation.
Greg Redell
Great-West Life & Annuity Insurance Co.
Phone: 314-525-5877
Email: Gredell AT GWL DOT com
[Insert Maniacal Laugh Here]
"Seay, Paul"
<seay_pd@NAPTH To: ADSM-L AT vm.marist DOT edu
EON.COM> cc:
Sent by: Subject: Re: Gigabit performance
with Win2K
"ADSM: Dist
Stor Manager"
<ADSM-L AT vm DOT mar
ist.edu>
09/12/2002
01:46 AM
Please respond
to "ADSM: Dist
Stor Manager"
Have you determined what the actual problem is. Is it the disk, the
server,
the network, or the tape drive. I would start with what data rate you are
getting right now. If you are getting 8MB+/second, then Gigabit may help,
but if you are getting 2MB/second then you probably will not even notice an
improvement. If the latter is true, you have to isolate where the problem
is. If you are using LTO or DLT type drives, they can go into latch back
and dramatically affect performance if you cannot provide the data fast
enough. That can be because of any component in the process, disk,
network,
server, domino. So, you need to figure out where the pain is first.
What Rob has said is very true. Just because it says Gigabit does not mean
you can get there. The fastest Intel Box we have ever seen is about
25MB/second reading a 100GB database with large blocks connected via SAN to
an IBM Enterprise Storage Server. That is as good as it gets. Whats the
gating fact? The IP packets burn up the CPU. These are 600MHZ XEONs I
believe. The other piece is the electronics on the Gigabit card may not be
able to move the data off the bus that fast so Gigabit just becomes
connectivity not usage. Kind of like putting a light bulb on a 10,000,000
kva circuit. It isn't going to use any more than it can process.
Paul D. Seay, Jr.
Technical Specialist
Naptheon Inc.
757-688-8180
-----Original Message-----
From: Rob Schroeder [mailto:robs AT FAMOUSFOOTWEAR DOT COM]
Sent: Wednesday, September 11, 2002 5:27 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Gigabit performance with Win2K
You're unlikely to get 10x improvement. Your problem will be a combination
of the drivers and the size of the server. You actually need quite a large
server with a good driver and an excellent fibregigabit card to drive true
gigabit. The question is: are you using the bandwidth you have today?
Rob Schroeder
Famous Footwear
608-827-3495 phone
608-662-6495 fax
Greg Redell
<GRedell AT GWL DOT COM> To:
ADSM-L AT VM.MARIST DOT EDU
Sent by: "ADSM: cc:
Dist Stor Subject: Gigabit
performance
with Win2K
Manager"
<[email protected]
.EDU>
09/11/2002 04:05
PM
Please respond to
"ADSM: Dist Stor
Manager"
Hello all,
We are currently looking into upgrading our network to from 100Mb to
gigabit
and our network architecture group wanted to make sure that TSM could use
all that bandwidth if it had it available. My main concern and the main
reason for the upgrade is our Domino servers, can TDP use the extra speed,
or is there too much overhead to let it ramp up to a good pace? Can we
expect TSM to get a 10x throughput increase? I know there is a lot on this
subject on ASDM.org but I did not see any comments on TDP or Win2K
environments.
Our environment is as follows:
The server and nodes are all Win2K SP2
TSM server 4.2.1.0 2x1GHz procs
File server clients 4.2.2.0 varying processors
TDP for Domino 1.1.2
Domino 5.0.8 on 4x550 mhz procs
Any input is helpful.
Greg Redell
Great-West Life & Annuity Insurance Co.
Phone: 314-525-5877
Email: Gredell AT GWL DOT com
[Insert Maniacal Laugh Here]
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