Re: Performance comparison Alpha ES40 vs Itanium rx3600


"Stephen Hoffman" <Hoff@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:ej2ovr$1fh4$1@xxxxxxxxxxxxxxxx
Syltrem wrote:

The key consideration here involves what factor(s) are currently
limiting your performance, and whether (or not) an Integrity server will
resolve these. If the application environment is pounding on a disk
spindle, for example, then even massive upgrades in processor speed
probably won't help aggregate performance.


It does not have enough memory (but can survive quite well). Having more
would certainly help. It currently has 8GB. Disks are fine. Bottleneck is
mostly CPU speed during heavy use.


It also has Advanced Server (Pathworks) with 500 connections and 50 open
files, and a dozen Progress databases.

IIRC, the Advanced Server product isn't available on OpenVMS I64. The
target Microsoft Windows SMB/CIFS server environment involves an HP port
of the Samba server and its accouterments, and this Samba SMB/CIFS stuff
is AFAIK in field test.


That's ok, we'll keep the Alpha around for some (long) time after installing
the Integrity.

If you want an answer with a degree of certainty (rather than the
guestimates that I or others can provide here), then I might suggest that
there be a prototype attempted. Use one or more of of your
applications -- some sort of a representative sample -- and load it and
test it on the Test Drive system or equivalent HP prototype environment to
see how fast it goes. I'd expect the server will PROBABLY be faster,
though the actual observed aggregate performance could range from GLACIAL
to GONZO, depending on what performance limits exist within your current
configuration. :-)


I'll see if that is feasible. Setting up a database on a remote machine is
not easy and means a lot of GB to transfer even for a small portion of the
data.


The other approach is to bring a local, borrowed or leased test system
on-line, and use that to qualify and to stage the migration. You or
somewhat you designate will be tweaking and/or porting code here after
all, and that's a task best done on a server reserved and dedicated for
testing, for target practice and for porting and development; on a
platform entirely disconnected from a production server and its
environment.


I'll look into this, too.

An XFC cache of 77 MB does not look to be a particularly large cache,
and would look like a potential performance constraint.

I would like the XFC to be larger but...
This machine has been pushed to its limit. That's why we want to change it,
but for what? That's the big question.
The new machine should be able to handle another 100 users and not suffer
from usage peaks (to our normal limit).

How does one usually proceed, when time comes to upgrade a server? It's
easier when you stay on the same platform but now, we have to switch from
Alpha to Itanium...
VAX to Alpha was quite simple too, probably most if not all Alphas were
faster than any model of VAX. The same is not true with Alpha and Itanium
but there is no guidelines.

Thanks for your thoughts
Syltrem


.

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