Just an aside, as the processes are running, type this command into TSM:

> run q_proc_stats

It will show the transfer rate of each process. There is also a 'run 
r_ses_stats'.

Miles


>>> Patrick.Rainer AT ARZ.CO DOT AT 03-Mar-04 8:35:47 AM >>>
Hello again

Sorry. Maybe my question can be wrong interpreted.
For example:

I have two migration processes from disk stgpool to tape drive.
My diskdrives offer about 20MB/s.
The question:
Is the transferrate of the diskdrives split up for the tape drives to 50%
for each drive? (10MB/s per drive) (Also means 50% per process)
Or uses one drive the full transferrate which is possible for one drive
(15MB/s) and the other drive only gets the rest (5MB/s)?

My problem -> 5MB/s means permanent Stop-and-Go-mode for one drive.
I would like to hear, that the TSM-server splits up the transferrate. This
means each migration process/job uses 10MB/s.

Thank you.

Best regards

Patrick



Karel Bos <Karel.Bos AT NUON DOT COM>
Gesendet von: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

03.03.2004 15:04
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"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


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Re: 2 LTO-Drives Load-Balancing






TSM is not load-balancing on a drive level. TSM will use multiple drives
on
a job level.

Regards,

Karel

-----Oorspronkelijk bericht-----
Van: Patrick Rainer [mailto:Patrick.Rainer AT ARZ.CO DOT AT]
Verzonden: woensdag 3 maart 2004 14:41
Aan: ADSM-L AT VM.MARIST DOT EDU
Onderwerp: 2 LTO-Drives Load-Balancing


Hello TSM users, a.a.o.o


I searched the mailinglist archive and the discussion forum, but did not
found a solution for my problem.
We are using TSM 5.2.2.1 for library evaluation. We are testing a HP
MSL5030 with two LTO1 drives.
Our disks provide a datarate of about 20MB/s.
LTO1 supports a datarate of maximum 15MB/s and starts STOP-and-GO-Mode at
about 7MB/s.
My question:
Is the TSM-Server balancing the load of the two drives?
That means: Every drive gets about 10MB/s
Or gets one drive 15 MB/s and the other only 5 MB/s?

We tried to analyze this load, but it isn't that simple. The only way is
to calculate the load out of the transfered bytes and the needed time.
How is it possible to monitor the load of one drive?
(HP told us, we shoud check if the LED's are blinking slow or fast ?!?)

Any ideas??


Best regards

Patrick