Peter
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Modifying the default configuration for the switch (e.g. rpoolsize &
Modifying the default configuration for the switch (e.g. rpoolsize &
rpoolsize) might certainly help you improve your switch performance (you
may do some ftp or nfs testing to find out), however it will probably
not help you to improve your backup performance since the bottleneck
will still be the ADSM-client's CPU or even the 3590s, never the switch.

Writing directly to disk might be useful for small amounts of data (e.g
archived logs) but I don't think it will help at all for DB data files.
Do not forget that you can write faster to a 3590 than you can to any
disk nowadays (unless it is many disks you are writing to
simultaneously).
I wouldn't even think of getting rid of those 2 sessions writing
directly into the tapes.

I agree with you that those thin nodes are right now a bottleneck.

Best regards.