> Where is it documented?

The description is in the TSM Administrators Guide in the "Using
Magnetic Disk Devices with TSM" chapter (my manuals are old, but this
hasn't changed since the ADSM days).

The important stuff is in the description of DEVTYPE=FILE and
DEVTYPE=DISK options for device classes and storage pools. With
DEVTYPE=FILE, you essentially define the SAN storage as a bunch of files
emulating tapes, and have TSM spool directly to them. TSM doesn't care
about what kind of disk storage the files live on as long as the
operating system can access it. DEVTYPE=FILE volumes can also be used
for database dumps and export/import processing, so if you're
tape-constrained on the Linux guest or you want to use normal 390 tape
drives, this is a partial way to cheat on the TSM stupidity of not
supporting channel-attached tape. 

With DEVTYPE=DISK, you use DEFINE VOLUME, and add the volumes to a
storage group as normal. DEVTYPE=DISK volumes are better suited for
random-access work, but can't be used for database dumps, etc. 

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