> -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Rugen, Len > Sent: Monday, April 25, 2016 7:08 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: VIRTUAL TAPE PECULIARITY > > I seem to remember adding a process to re-init tapes at scratch so they > would free VTL space.
Yes, we ran low once and I needed to reinit for awhile. I'm not currently because I do like the option to retrieve even if scratched. Haven't needed it this century :) but nice back pocket feature. > > Len Rugen > > University of Missouri > Division of Information Technology > Systems & Operations - Metrics & Automation Team > > ________________________________________ > From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on > behalf of Gibney, David Allen [gib...@wsu.edu] > Sent: Monday, April 25, 2016 8:23 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: VIRTUAL TAPE PECULIARITY > > It also does depend on the type of VTL. A Luminex MVTi for example, doesn't > reclaim until you write to the scratch tape or reinit it. > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > > On Behalf Of Lizette Koehler > > Sent: Monday, April 25, 2016 9:53 AM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Re: VIRTUAL TAPE PECULIARITY > > > > Virtual tape processing is the similar to physical tape processing. > > Only difference is that virtual tapes are files are on a storage array > > and the physical tapes are square boxes you can tote in your hand. > > > > So you need to determine what are the requirements for a tape to go > > scratch. Once that point in time occurs for scratching the tapes, the > > storage is reclaimed in the tape storage array. As others have > > pointed out, the storage can be reclaimed if the physical storage on > > the Virtual storage array for tape happens (95% for example), it will start > > to > reclaim what it can. > > > > If you have a tape management system like CA1, TLMS, etc.... Then you > > need to find out what their requirements are for scratching the tape. > > It is best if the two environments (tape management system and virtual > > tape system) use a same point in time to scratch tapes. > > > > When we first installed our VTS, we had X days for the VTS and Y days > > for CA1. Needless to say, we got several issues where the tape looked > > like it should be viable but became scratched. We later sync'd the > > two up to 2 days for both. > > > > You also need to know how much physical storage is on the VTS and how > > much is being used. Too little physical storage could cause the VTS > > to start reclaiming tapes that are scratched more quickly. > > > > The relationship between your tape, when it gets scratched and when > > the virtual tape storage system recovers that data will be unique for > > your shop. If you can contact the group responsible for supporting > > your virtual tapes, they can probably give you better answers. > > > > Things to review > > > > 1) What is the tape management system (TMS)? > > > > 2) When does the TMS scratch tapes > > > > 3) When does the VTS scratch tapes > > > > 4) How much storage is on the VTS and how much is being used? > > > > 5) How long do you have after the TMS scratches the tape before the > > VTS reclaims the space? > > > > Next review how your tape dataset is being created. What is the EXPDT > > or RETPD for the dataset? Is it long enough? Do you need to extend > > that timeframe? > > > > > > Lizette > > > > > > > -----Original Message----- > > > From: IBM Mainframe Discussion List > > > [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John Dawes > > > Sent: Monday, April 25, 2016 9:27 AM > > > To: IBM-MAIN@LISTSERV.UA.EDU > > > Subject: Re: VIRTUAL TAPE PECULIARITY > > > > > > Is it safe to say that once a tape goes scratch all the data is deleted? > > > > > > Also, is the same volume serial number - in this case A15886 - is > > > kept and reused? > > > > > > Please bear with me because I am not very familiar with virtual tape > > > processing. > > > > > > > ---------------------------------------------------------------------- > > 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 > > ---------------------------------------------------------------------- > 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
