Willie,
Actually Zos will attempt to satisfy a Primary allocation in 5 extents or
less.
Explain to your user that expecting to find a volume 2/3s empty in a SMS pool
is unlikely. Suggest to him the following:
//OUTERR DD DSN=DE01.DE0PS$02.XDS1.EXPAND.ERR(+1),unit=(sysda,10),
DISP=(,CATLG,DELETE),
SPACE=(CYL,(300,200),RLSE),
DCB=(MODELDCB,RECFM=FB,LRECL=14126)
Worst case his 2000 cyls get allocated over 10 volumes, that's assuming he
knows how much space he needs. Job runs, everybodys happy.
Or set a couple of volumes in the pool to Quiesce. This will cause these
volumes to act as an overflow for the pool, accepting allocations that can't be
satisfied elsewhere.
________________________________
From: willie bunter [mailto:[EMAIL PROTECTED]
Sent: Fri 4/11/2008 9:31 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Question On Space Allocation
Good Day To All,
My question is regarding the allocation of space on a given storage group
which has 218 volumes. The job failed, due to a "IGD17279I 218 VOLUMES WERE
REJECTED BECAUSE THEY DID NOT HAVE SUFFICIENT SPACE (041A041D)"
To resolve the problem I added 2 disks (3390-9) as a quick fix. I asked the
user to correct the jcl so as to ask for a smaller primary and a larger
secondary. He refuses to do so because in his opinion "the system will search
for a volume that has that much free space in four "chunks" or less. If you ask
for less space in the PRIMARY allocation, the system may choose a volume that
has that much free space, but not enough to overflow into the SECONDARY
allocation, if needed." I was not aware of the fact that the system allocates
the space in chunks. Could anybody confirm this? Also, in the case of the
allocation being done in 4 chunks, does the system allocate the dsn on the same
volume or on other voumes within that particular storage group?
In the case of not heeding my recommendation to reduce the primary allocation
would there be another alternative that I could suggest besides putting the dsn
to tape?
Below is the user's code for the output dsn:
//OUTERR DD DSN=DE01.DE0PS$02.XDS1.EXPAND.ERR(+1),
DISP=(,CATLG,DELETE),
SPACE=(CYL,(2000,250),RLSE),
DCB=(MODELDCB,RECFM=FB,LRECL=14126)
Thanks for your comments and suggestions in advance.
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com <http://mail.yahoo.com/>
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
