We have seen massive savings - primarily in wall-clock savings - but from what I understand (2nd and 3rd hand):
3490s have a max blksize of 64k; 3590s have a max blksize of 256K If you use virtual tapes - make sure the virtual tapes are defined as 3590s to get the best LBI benefit Chris hoelscher Technology Architect | Database Infrastructure Services Technology Solution Services 123 East Main Street |Louisville, KY 40202 choelsc...@humana.com Humana.com Keeping CAS and Metavance safe for all HUMANAty -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Mark Jacobs Sent: Thursday, August 16, 2012 11:59 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [IBM-MAIN] ADRDSSU Large block performance Really? Our results (full volume dumps) haven't shown any major improvements. Mark Jacobs On 08/16/12 11:54, Scott Barry wrote: > Yes, significant elapsed time improvement, to start. > > Unfortunately, there are instances where someone has hardcoded BLKSIZE= which > overrides the LBI benefits. Consider scaning the tape management catalog, > looking for these improvement opportunities (removing any/all DCB parameter > values). > > Scott Barry > SBBWorks, Inc. > > On Thu, 16 Aug 2012 08:51:27 -0400, Martin, Mike<mike.mar...@ncsecu.org> > wrote: > > >> All, >> >> >> >> We are upgrading to z/OS 1.13 from 1.11. ADRDSSU will now use BSAM and >> blocks of 262k (1.11 used 65k). >> >> >> >> Has anyone seen big benefits in their shop from this change? >> >> >> >> Mike Martin >> >> </PRE>This email may contain confidential and privileged material for the >> sole use of the intended recipient. If you are not the intended recipient, >> please contact the sender and delete all copies. Any review or distribution >> by others is strictly prohibited. Personal emails are restricted by policy >> of the State Employees' Credit Union (SECU). Therefore SECU specifically >> disclaims any responsibility or liability for any personal information or >> opinions of the author expressed in this email. >> >> </P> >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >> > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > -- Mark Jacobs Time Customer Service Tampa, FL ---- The Doctor: You know when grown-ups tell you everything's going to be fine, and you think they're probably lying to make you feel better? Young Amy: Yes. The Doctor: Everything's going to be fine. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN The information transmitted is intended only for the person or entity to which it is addressed and may contain CONFIDENTIAL material. If you receive this material/information in error, please contact the sender and delete or destroy the material/information. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
