Our DASD people have asked if they can replace our 3390-3 size DASD
volumes with 3390-9's. My tentative answer is that most of the volumes
that contain minidisks can be moved, if the new DASD has PAV. CP areas
such as paging should remain on 3390-3. Our SFS servers have
3338-cylinder minidisks, one per volume. My initial thought is that I
could put 3 of them on a 3390-9 with two PAV aliases, and the SFS server
could do one I/O to each minidisk at the same time, just like it can
when the minidisks are on separate volumes.
In the recent "dasd 3390 -27" thread, Kris Buelens said, "For SFS though
(and probably DB2) PAV is maybe of limited help: a given SFS server will
start only one I/O to all its minidisks on the same disk." Is that
really true? Does an SFS server look at the real devices or volsers
that its minidisks are on, and only start an I/O to one minidisk on a
volume at a time?
Dennis O'Brien
The three R's of Windows problem resolution: Retry, Reboot, Reinstall.
