What you can do is adjust your ML1 / ML2 threshold size and Small Dataset Set Packing size. Increase them and more datasets go to ML1. Decrease them and they go to ML2. Adjust number of ML1 volumes as needed and you have the capacity for.
When we got out VTAPE system, the ML2 recalls were faster than the dasd recalls, so we went down to the bare minimum (VTOC backups). We implements a threshold of 1MB ML1 50KB SDSP and have a few Mod 3s in use. Cut way down on the number of datasets written and volumes to recycle. On Tue, Nov 18, 2014 at 11:11 AM, Hervey Martinez <hervey.marti...@custserv.com> wrote: > Lizette, > > I don't know what is the driving force for this since we converted to a VTS > and been using it about 2 years; my manager asked about it and I said, I > don't think it can be done then started thinking about housekeeping such as > recycling and thought I'd ask. > > Regards, > > Hervey > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Lizette Koehler > Sent: Tuesday, November 18, 2014 10:27 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: HSM ML2 on disk > > Hervey > > What is driving the need to move from TAPE to DASD? > Which is less cost - Tape or Dasd? Going to dasd will require lots of dasd > over time. With tape you can stick it on a shelf. On DASD you can only buy > more Which has the High Availability that you need? > How stable is your DASD vs. TAPE > > If you lose you "disk" file of a tape then you lose everything. If a tape > cartridge goes bad, it may be possible to recover it any way. > > We went pure tapeless in my shop. Recalls and migrations are faster (much > faster). But I am needing to add more storage perhaps faster than I did when > I just had to purchase tapes. > There is less wasted space on virtual tape. I have 300GB tape files defined. > But if a file is only 100KB then that is all that is used. I no longer > waste a whole 300GB tape. > > Hope this helps. > > Lizette > > >> -----Original Message----- >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] >> On Behalf Of Hervey Martinez >> Sent: Tuesday, November 18, 2014 8:13 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: HSM ML2 on disk >> >> Yes, right now we do have a VTS that emulates a 3590 tape but we are >> looking at using ECKD to house the traditional ML2 files that historically >> have been on tape. >> >> Regards, >> >> Hervey >> >> >> -----Original Message----- >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] >> On Behalf Of George Rodriguez >> Sent: Tuesday, November 18, 2014 9:39 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: HSM ML2 on disk >> >> Hi Hervey, >> >> I sort of did that, except that my ML2 was moved to my VTL (Virtual Tape >> Library). >> Very smooth transition. Even the recall was very fast... >> >> >> *George Rodriguez* >> *Specialist II - IT Solutions* >> *IT Enterprise Applications* >> *PX - 47652* >> *(561) 357-7652 (office)* >> *(561) 707-3496 (mobile)* >> *School District of Palm Beach County* >> *3348 Forest Hill Blvd.* >> *Room B-251* >> *West Palm Beach, FL. 33406-5869* >> *Florida's Only A-Rated Urban District For Eight Consecutive Years* >> >> On Tue, Nov 18, 2014 at 9:17 AM, Hervey Martinez < >> hervey.marti...@custserv.com> wrote: >> >> > Just wondering if any of you out there have converted your >> > Mainframe's HSM >> > ML2 from tape to disk? If so, what are the pitfalls? A quick search >> > of Google did not yield much; so, just wondering if anybody has done this. >> > >> > Regards, >> > >> > Hervey >> > Storage Administrator >> > >> > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email to > lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > Please be alert for any emails that may ask you for login information or > directs you to login via a link. If you believe this message is a phish or > aren't sure whether this message is trustworthy, please send the original > message as an attachment to 'phish...@timeinc.com'. > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
