Hi there...
I hope someone can offer some help with the following problem..
Server Tivoli Storage Manager for MVS V5 R2 L2.0
84 clients - mixture of Windows, Netware, AIX, Lotus Notes, Solaris.
Disk Pool IBM 3390-3 Mainframe Disks
Tape Pool IBM 3590-E Magstar x4 2x fibe channels to drives
We back up around 220 Gb of data to the disk pool overnight, then migrate
(with cacheing on) to cartridge in the morning.
On 2nd of this month, the average speed of the migration from disk to
cartridge plummeted by almost 10 Gb/Hour, then by another 4 Gb/H the
following day.
It has since averaged under 20 Gb/Hour, when previously (before 2nd August)
it was 35 Gb/H.
All other major Tivoli functions (expiration, reclamation) seem to be
constant in duration. We do not collocate (yet).
Two large mail (Lotus Notes) server go straight to cartridge, and are
unchanged in duration (ave. 27Gb/hour running together)
All other non-Tivoli backups to cartridge are also unchanged in duration.
The Tivoli server performance group has not been changed, so is getting the
same CPU.
I have had to add another migration process to ensure it finishes before
the cartridge drives are needed for the evening batch, but with only four
drives,
this is causing contention.
I can think of no changes to Tivoli that would have caused the loss of
transfer speed. Has anyone else encountered such a thing?
The ADSM-L archives offer nothing specific for this problem, so I am
wondering if it is a Tivoli issue at all.
Thanks,
Jim Duncan
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