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Re: [ADSM-L] Slow connection on one dsmc sel
2007-03-29 08:26:49
Thanks for your reply Richard... sorry for not giving specific details !!
We are backin up directly to disk. At the moment three of the dsmc have
finished. Only one stills !! but very slow comparing to others...
We have check network performance and the net is freely at 80 %, so we
are only using 20 % of our throughput.
Does the TSM client do it best to get the better throughput independly
of how the network is ¿?
Thanks in advance,
Ibán.
Richard Sims wrote:
On Mar 29, 2007, at 5:41 AM, Ibán Bernaldo de Quirós Márquez wrote:
We are running 4 dscm sel -filelist in parallel to reduce processing
time and increase backup time in a node.
The problem is that 3 process are running at a very good speed but
the last one is running very slow, we have check network performance
and seems to be good. Also we have follow the performance tuning
guide to set network parameters on client and server...
Well, we can't offer any evaluation without details...such as whether
there is a disk storage pool receiving the data or number of tape
drives available to the client (MAXNUMMP). It is likely that your
four simultaneous sessions are excessive relative to the server
resources that can be given to that client: check your Activity Log,
or perform Query SESSion as they are running, or process the TSM
accounting records to report where wait times are. If the backups are
going directly to tape, then you have to wait for drives to be
available and tapes to mount - and you may be overly consuming scratch
tapes where TSM will see that the latest Filling tape for that
client/filespace is in use, and will use scratches for additional
sessions.
Richard Sims
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