Also check your maximum filesize for the storage pool.  If the clients
contain a file that exceeds the maximum file size then the data will go to
the next storage pool which is probably tape.
Jim Sporer

At 03:51 PM 4/4/2001 -0400, you wrote:

Do a "q stg"  when this happens and see what the "Pct Util" and Pct Migr"
is for the disk storage pools in question.  If Pct Util is anywhere near
say 90% when a bunch of clients are sending data then some of them WILL
start trying to go directly to tape.

Why you say?  Example: you have 10GB storage pool that is 90% full.  2
clients each start to send a new 1 GB file.  Immeadiately the Pct Util
would be theoretically 110% as space is allocated for the size of the
file, but it will take some time for the file to be completely transfered.

So one of them will not be able to get it's space as we can't be over 100%
and it will therefore attempt to go directly to tape.   Ciomplictate this
with many clients and many different size files (And probably a few fudge
factors) and you will get these results.

We have seen backups start to go to tape when our stg pool was about 90% +
full with a handfull of clients sending 2GB files.

If you are getting about 90% full anytime then you probably need to either:

1.  Spread out the backups so not as many machines are going to the server
at once.

2. Increase the disk space available to the disk storage pools that are
being filled.


David B. Longo
System Administrator
Health First, Inc.
3300 Fiske Blvd.
Rockledge, FL 32955-4305
PH      321.434.5536
Pager  321.634.8230
Fax:    321.434.5525
david.longo AT health-first DOT org


>>> rdearm1 AT UIC DOT EDU 04/04/01 03:01PM >>>
I run my backups at night around 10:30pm.  I have around 50 servers doing
incrementals concurrently at this time.  I noticed that about half are
experiencing MEDIAW when I do a "q session".  They seem to be waitng to for
a tape to load in my library for them to write to but the storage pool that
these clients write to first is disk based then when it fills to 90% it
should migrate to tape.  My question is, if they are suppose to be going to
disk storage pool first and it isn't full then why are they waiting for
tape.  Which is what I am assuming is happening.

Thanks
Richard
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