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My first guess would be the 2778 and 6718s are holding you back.  Their
cache & disk speed pale in comparison to the new stuff.  The controller
in particular as the 2778 has 26MB write cache and no read cache vs. the
2780's 1GB write & 757MB (w/compression) read caches.  Cache can make a
huge difference.

Also, the 2778/6818 are 80MB/sec SCSI while the 4326s are 160MB/sec.
Not an issue for an individual drive as modern single drives don't
sustain that high of a transfer rate but the 80 & 160MB numbers are the
max combined for the entire chain.

Other factors would include:
- differing drive sizes/platter densities between the 18 & 35GB disks
- PCI vs. PCI-X buses in the drawers
- 10K vs. 15K makes a difference in latency.
- system RAM; was it increased?  Are pool allocations comparable?
- if the old system was CPU/RAM-contrained, you may have also been
DASD-constrained but just not known about it.  With CPU raised, it's
possible you eliminated one constraint just to bump in to another.

Unless you're using multiple ASPs to isolate your production files to
the 15K drives & new controllers, your older tech is very likely holding
you back.


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