They are virtual 3490s in a 3494 VTS from IBM. To anticipate some likely questions. They are SMS managed. The DATACLAS assigned to all virtual 3490s has COMPACTION=YES specified in it. The messages indicate that they are compressed. Eg:
IEC705I TAPE ON 0601,205917,SL,COMP,PPRI100D,PS060.JS010,PRIPG.GRP.GCRLCHKS.PREBKUP.G2885V00,MEDIA2 <before conversion> IEC205I FVROUT0,PPRI100D,PS060,FILESEQ=1, COMPLETE VOLUME LIST, 305 DSN=PRIPG.GRP.GCRLCHKS.PREBKUP.G2883V00,VOLS=264066,264094,266057, TOTALBLOCKS=270716 </before> <after conversion> IEC205I FVROUT0,PPRI100D,PS060,FILESEQ=1, COMPLETE VOLUME LIST, 301 DSN=PRIPG.GRP.GCRLCHKS.PREBKUP.G2885V00, VOLS=205917,272723,217801,270266,207012,211973,274660,216448, VOLS=227706,213369,206060,TOTALBLOCKS=3326908 </after> The conversion job does a Faver backup, followed by an IDCAMS EXPORT. The stats: IEC205I FVROUT0,EXP00152,FAVER,FILESEQ=1, COMPLETE VOLUME LIST, 835 DSN=GVBPN.PRIPV.PR.GCRLCHKS,VOLS=265418,292061,265898, TOTALBLOCKS=270620 IEC205I OUTFILE,EXP00152,EXPORT,FILESEQ=1, COMPLETE VOLUME LIST, 655 DSN=EXPPN.PRIPV.PR.GCRLCHKS, VOLS=230343,230359,266156,252995,230627,267258,233365,267150, VOLS=267698,229245,277722,TOTALBLOCKS=2058408 -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Pommier, Rex R. > Sent: Wednesday, September 14, 2011 8:54 AM > To: [email protected] > Subject: Re: SMS compressed VSAM datasets > > From 3 output tapes to 12? What kind of tape drives are you using? > > Rex > > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of McKown, John > Sent: Wednesday, September 14, 2011 8:18 AM > To: [email protected] > Subject: Re: SMS compressed VSAM datasets > > Given that the most obvious difference is that what used to > take 3 output tapes is now going to 12 output tapes, the > "slow down" is due to the number of bytes being written to > tape. The bytes read from disk seem be about the same because > the number of cylinders taken by the VSAM dataset is the > same. The "problem" is that Faver is expanding the compressed > bytes in the SMS case but not in the Data Accelerator case. > We are talking to CA about why Faver expands the compressed > bytes when the dataset is SMS compressed instead of just > "sucking it up" using something like a "read track" CCW which > I think would bypass the SMS decompression. > > BTW - Faver is working exactly as it is documented to work in > the Faver manual. We just don't like it. <shrug> > > -- > John McKown > Systems Engineer IV > IT > > Administrative Services Group > > HealthMarkets(r) > > 9151 Boulevard 26 * N. Richland Hills * TX 76010 > (817) 255-3225 phone * > [email protected] * www.HealthMarkets.com > > Confidentiality Notice: This e-mail message may contain > confidential or proprietary information. If you are not the > intended recipient, please contact the sender by reply e-mail > and destroy all copies of the original message. > HealthMarkets(r) is the brand name for products underwritten > and issued by the insurance subsidiaries of HealthMarkets, > Inc. -The Chesapeake Life Insurance Company(r), Mid-West > National Life Insurance Company of TennesseeSM and The MEGA > Life and Health Insurance Company.SM > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List > > [mailto:[email protected]] On Behalf Of Staller, Allan > > Sent: Wednesday, September 14, 2011 7:50 AM > > To: [email protected] > > Subject: Re: SMS compressed VSAM datasets > > > > 1) I would increase bufnum before bufsize.... > > 2) Compress the output... > > > > HTH, > > > > <snip> > > This is a weird question, but I've been directed to ask it. We are > > converting some VSAM datasets which currently use BMC's Data > > Accelerator > > compression to use SMS compression instead. This is a financial > > decision. We use CA-Faver to do our VSAM backups. Faver > states in its > > manual that it will unload the VSAM data to its archive in > > uncompressed > > form. I guess this is because Faver "knows" it is SMS > compressed. When > > the data was compressed via Data Accelerator, Faver was > > unaware that it > > was compressed, and so did not interface with Data Accelerator to > > uncompress the data. This meant that the data on the tape was > > in a very > > compressed form. Which is not true with SMS compression. > The result of > > this difference is that our backups are taking much longer. > > Which was a > > surprise to all and is causing concern. So my question out > > there is "any > > ideas on what I can do to make run faster"? So far, the only > > suggestion > > from CA is to increase the BUFSIZE on the dump. But I don't > think this > > is going to reduce the run time significantly. > > </snip> > > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: GET > IBM-MAIN INFO > > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > The information contained in this e-mail may contain > confidential and/or privileged information and is intended > for the sole use of the intended recipient. If you are not > the intended recipient, you are hereby notified that any > unauthorized use, disclosure, distribution or copying of this > communication is strictly prohibited and that you will be > held responsible for any such unauthorized activity, > including liability for any resulting damages. As > appropriate, such incident(s) may also be reported to law > enforcement. If you received this e-mail in error, please > reply to sender and destroy or delete the message and any > attachments. Thank you. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
