David,

I run a GigE NIC in my TSM 2-way 6H1 with all SCSI-connected storage.

GigE works very well because most of the sending nodes are on 100 Mbs with
a few larger servers on GigE.  That prevents the recipient - the TSM
server - from being the bottleneck.

The CPU load scales up with the data througput, but using Topas, I have
seen as much as 80 MB/s passing through the NIC during peak backup times.
And while idle % was very low (~1 % or so) the server reported no
difficulties and response time to TSM Admin commands like "Q  PR" was
instantaneous.

Tab Trepagnier
TSM Administrator
Laitram, L.L.C.




"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 11/10/2004
07:14:01 AM:

> >Another option is to bump-up your ethernet... are you already running
> a
> >gigabit ethernet?  We've actually bumped up the TSM server and the
> large
> >unix clients to Gigabit Ethernet, and it improved the throughput of
> the
> >backup.
> >
>
> The 100 meg card in our TSM server is saturated during our backup
> window.  We are exploring moving to a gig ethernet.  Did you see changes
> in your TSM server when you went to the faster speeds?  Higher cpu,
> paging?  What effects did you see in your disk/tape I/O?
>
> David