For z/OS 3.1 Adabas sites I support on Mod 27's, I tend to have 3 volumes to make each system, a RES, DLB and USS volume. The USS volume contains the base Unix datasets (root, etc.), and tends to be 60% used, the RES volume tends to be about 50% used and the DLB volume tends to run close to 90% used.
I have several dataset over-allocated because it makes service a lot easier, so you could probably get by with much less. I use mod 54's for the sites that support them, and even though I "could" put the USS stuff back on the RES volume there, I don't. If you don't over-allocate things (like me), then you will probably have your DLB volume closer to under 80% full. The way I do my maint is to clone these three volumes, changing hte names of the USS datasets slightly, create a new SMP/e zone for them and apply the maintenance, then I can simply IPL with the new volumes and keep the old volumes for a fall-back. So, short story is that you can do it with mod-27's and not have to worry about running out of space. Brian ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
