Disk/Tape Request Size Questions

[stone]

What limits exist on the size of single transfers
to/from disk and tape (tape block size) in the Unix
world, and elsewhere.

What effects on performance are there for using larger
size transfers (i.e. do other requests pay a penalty
while a large transfer is being serviced)?

What are appropriate limits (if any)?

For example our system (Arete A1000 SYS V.2.2) currently
supports up to 16k for tape blocks and up to 256k for disk transfers.

David Stone
Arete Systems
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