> -----Original Message-----
> From: Norback, Jan [mailto:Jan.Norback AT ATOSORIGIN DOT COM]

> Tom,
> We have just upgraded from V2.7 to V3.2.0.6 in the weekend (I
> guess your
> 3.4.0.6 is a typo).

Yup. It was a bad weekend that carried over to Monday :-)

> Our HW is similar with Gbit (one), AIX 4.3.3 and ESS. We am
> not using the
> new option SORT_FILE. I tested with different MULTIPLEXING
> and ended with 5
> as the best value for performance (probably depends on the
> layout of the
> filesystem in the ESS). 2 streams.

I was doing 6-way multiplexing; I'm about to start backing this down to see
if anything changes. I was tape-speed limited (I can't get better than 15
MB/sec per tape drive, and I think this is an S7A I/O layout limitation). I
was seeing 60 MB/sec on 4 tape drives and 70 MB/sec with 5; with 5 tape
drives in use the S7A that runs TSM is REAL busy. I suspect we need to go to
'jumbo' frames on the gig ethernet.

I'm also thinking the new TDP is doing too much work with the
rl-compression, because the source S7A is running at 100% cpu utilization
(an 8-way box). But with my tape I/O limitation, turning off rl-compression
puts me back to the same wall-clock backup times :-(


I've a question in to Germany on this, and just got back the email that they
got my question. I'd call support, but we're still trying to get the PA
support contract put together.

Tom Kauffman
NIBCO, Inc