What I have noticed over the years (in AIX environments) is that TSM spreads the load out across its direct access volumes. Say you have 9 logical volumes across 3 physical and you have 3 inbound client sessions... TSM will spread that inbound traffic across 3 of its (locical) volumes. If you have 3 logical volumes per physical volumes, the inbound work might be going all to the same physical volume. So there is a possibility of a slight performance problem by having multiple logical volumes per physical volume, I say slight because I very rarely see small numbers of inbound sessions (or activity) on the tsm servers. If you resize to a 1 logical per physical, you might see a slight increase in performance... just my 2 cents worth based on general observations over the past 7 years.
Dwight -----Original Message----- From: David Browne [mailto:[EMAIL PROTECTED]] Sent: Monday, January 13, 2003 8:19 AM To: [EMAIL PROTECTED] Subject: We are running TSM 4.2.2.0 on OS390/2.10 and we are in the process of replacing our mod 3 dasd with mod 9's. Currently I have a disk storagepool with a mixture of mod 3 and mod 9 dasd volumes, however when I define my dasd storage pool volumes I sized them as mod 3. I also have my database volumes broken in to mod 3 size volumes if they reside on a mod 9. My question is will I see a performance issue if I resize all of my storage pool volumes and database volumes to a full mod 9 in size?
