finding the (biggest) bottle neck

From: Jack Patteeuw (jjpatteeuw_at_nospam.net)
Date: 05/02/05 

Date: Mon, 02 May 2005 02:38:33 GMT

I have just recently gotten back into VMS after 10 years on the "dark
side" (Tru64 and Solaris).

The biggest problem we have with our mixed VAX (3 - 7630)/Alpha (1 -
GS140) cluster is backups. Full backups can take over 14 hours using
ABS/MDMS.

All disk are on one CI, with HSJ40 and HSJ50 controllers. Most are
JBOD, but we want to RAID 5 some, which I know will probably slow disk I/O.

All tape (TZ88's) are on another CI using a different HSJ50. The
previous Sys Admin says adding more tape drives to the process did not
improve thing (we are only using 4-6, but have 12 available)

We have an extremely limited budget, so I need to figure out where to
get the "most bang for the buck" with any upgrade. My gut says, upgrade
the tapes to TZ89, but I need some proof. Or would we get more
performance out of a HSJ80 on the disks ?

I need suggestions on how to measure the "capacity" of each CI as well
as the throughput of the HSJ's and the processors themselves.

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