Why are you writing a 19GB dataset to the VTS? The VTS is designed to handle small datasets, usually a few 100MB and at most what you can fit on one 3490 cartridge. To do this backup the VTS will have to mount 19+ scratch volumes. The VTS will also need space on the VTS disk cache for such a large dataset, so you could have the VTS spending time trying to offload data from the disk cache to the 3590 stacking tapes. This could be slowing down your backup. What else is happening on the VTS when you are doing this backup? Which model of VTS do you have?
Adolph Kahan GlassHouse Systems Inc. 416-229-2950 Ext 304 -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]] On Behalf Of Schaub Joachim Paul ABX-PROD-ZH Sent: Friday, April 12, 2002 4:49 AM To: [EMAIL PROTECTED] Subject: TSM DB Fullbackup 19GB takes 4 hours on OS/390 VTS Dear *SM Gurus The TSM DB Fullbackup (19GB) takes about 4 hours on OS/390 with VTS. I haven't found any descriptions for parallelisation, eg. maxpr or mountp. Is it in the tec. nature, the DB will be backed up in sequenz? tia Joachim ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Joachim Paul Schaub Abraxas Informatik AG Beckenhofstrasse 23 CH-8090 Z�rich Schweiz / Switzerland Telefon: +41 (01) 259 34 41 Telefax: +41 (01) 259 42 82 E-Mail: mailto:[EMAIL PROTECTED] Internet: http://www.abraxas.ch ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
