Hi Wanda!
You have to make a huge difference between VTS solutions and tape emulators.
A tape emulator (like EMC's DL300/700) just emulate a tape device and will
leave the data on disk. No problem here for TSM.
IBM's VTS and other products (like Fujitsu's CentricStor) store the data on
disk and de-stage it to tape later on. The hardware stacks data on tape and
reclaims these tapes in the background. Since TSM als has to reclaim his
tapes, this will have a very negative impact on tape performance because of
fragmentation. You should NOT use such a product for TSM!
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


-----Original Message-----
From: Prather, Wanda [mailto:Wanda.Prather AT JHUAPL DOT EDU]
Sent: Thursday, March 17, 2005 16:52
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Questions for people using Virtual tape libraries


For those of you who have made the leap to Virtual tape libraries:

I don't see any of these devices on the TSM hardware support page;
do you just base your "TSM support" on the device type that the VTL
emulates?

And has anyone run into problems with a VTL that have to be resolved by
the VTL vendor?
Any kind of SCSI errors, or problems other than replacing physical
disks?

Thanks!


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