Compression is nice, but many VTLs take a large performance hit doing compression.
The killer feature of VTLs is data de-duplication, which is beginning to be available. Orville L. Lantto Storage Consultant GlassHouse Technologies, Inc. 200 Crossing Boulevard Framingham, MA 01702 [EMAIL PROTECTED] www.glasshouse.com -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Mark Stapleton Sent: Monday, December 11, 2006 2:08 PM To: [email protected] Subject: Re: [ADSM-L] Survey Question for Virtual Tape Users: What Vendors are you using for Virtual Tape? From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Roger Deschner >I keep hearing it said, that if you're going to buy a great big disk >array for TSM, that it works better if you let TSM know it has disks >(DEVCLASS=FILE), than if you lie and try to tell it they are virtual >tapes. The problem with this being, of course, that you get no compression of data--the big advantage of VTL and the purpose of the VTL layer. -- Mark Stapleton ([EMAIL PROTECTED]) Senior TSM consultant
