When we made the conversion to OS/390 2.6, I actually got to talk to one of
the TSM server developers. It wasn't related to throughput, but I talked to
him about it. According to him, you won't really see a throughput
improvement so much as a reduction in TCP CPU utilization. By coding
directly to the BPX callable services, they are saving the 'translation' of
the TCP requests into the BPX sockets services. He told me that the big
throughput improvements come with the giga-bit Ethernet OSA cards. The
overhead of the Fast Ethernet OSA is what is preventing the thoughput since
the system still sees it as a channel-control unit-device, and still goes
through the whole IOS path. The gig-bit adapters are direct memory
accessible.
My thoughtput is about 10-12 GB/hour. That is testing a NTserver on the same
switch as the OSA card.
Bill Boyer
DSS, Inc.
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of
Mark Brown
Sent: Monday, December 04, 2000 11:48 AM
To: [EMAIL PROTECTED]
Subject: OS/390 2.4 to 2.6 and TSM 3.7 performance.
Hello,
We will be upgrading our os/3909 2.4 system to 2.6 to take
advantage of the newer tcp/ip stack that will hopefully improve
TSM backup/restore transfer rates.
The best I've seen here using a unix 3.7 client to the tsm 3.7 server
running on os/390 was about 1.5 KB/sec (aggregate). We have a 100 MB
connection to our network.
Could someone tell me what kind of performance increase I can expect
to see going to os/390 2.6 with the improved tcp/ip stack??
--
Mark Brown
Operations Supervisor
=====================
Tel ---> 514-398-2321
Fax ---> 514-398-6876
E-mail ---> [EMAIL PROTECTED]
