Hello, David.

Have a look at the 'fcstat' command recently introduced into AIX.  This
will output an unpleasant bunch of data, but some nice scripting can
isolate the FC SCSI Traffic Input Bytes and Output Bytes lines for the
desired HBA, even if the HBA doesn't have disk on it.  A loop, fcstat |
grep | awk, sleep , and a subtraction will give you bytes/second
numbers.  Heck, it'll even give you cool stuff like IP over FC bytes if
you use it.


________________________________
Alex Paschal
Storage Solutions Engineer
MSI Systems Integrators
________________________________

Your Business.  Better.



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
David Bronder
Sent: Friday, February 27, 2009 12:34 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Tape performance (was: Re: Preferred TSM Platform)

Wanda Prather wrote:
>
> And there is NO instrumentation in Windows to give you any idea
whatever
> about what is going on performance-wise on a bus with tape drives
attached.

Unfortunately, there doesn't seem to be any real instrumentation in AIX
about tape drive performance, either.  None of the standard AIX tools
seem to give tape-related information (e.g. iostat or nmon), either for
the tape drives themselves or for the buses or adapters the drives are
connected to (unless there is also disk behind those buses or adapters).
(Speaking only of FC drives, since the last time I used SCSI tape drives
years ago, I never tried to get that data.)

So far, neither IBMers nor business partners I've talked to have been
able to identify a way of collecting that kind of data, either.  The
best
ideas I've been able to come up with are manual timing tests (measure
the
time to transfer a known volume of data, whether within TSM or
externally)
or to look at stats on the fibre ports on the SAN switches (assuming one
has that kind of access to the switches).

If anyone can tell me differently, I'd love to hear about it.  Even if
(especially if?) it's something dead simple or obvious that I've been
missing.

=Dave  (sticking with AIX for TSM for the forseeable future)

--
Hello World.                                    David Bronder - Systems
Admin
Segmentation Fault                                     ITS-SPA, Univ. of
Iowa
Core dumped, disk trashed, quota filled, soda warm.
david-bronder AT uiowa DOT edu


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