>Yes, that's what he mean. We do this since some years, even IBM has this >concept which is called TMM. >We created a large DASD pool, changed the ACS routines to point the >UNIT=CART to this pool (no JCL change necessary) and let HSM migrate to >cartridge. However there are still some very big files going out directly
>to cartridge, because migrating/recalling them would take too much time. >Using this TMM concept saved us to get extra software for tape stacking, >however HSM CPU usage is going up. >Werner Kuehnel I'm familiar with the concept. My understanding of the origin of this thread was that they were looking for free software to take datasets curently on tape and stack them onto new tape technology. While using HSM and even TMM for new datasets would be pretty straight-forward, using them to perform the stacking functions for existing tapes is a bit more complicated - consider existing tapes with stacked datasets. Catalog-control datasets - if even one of the stacked datasets is cataloged, the entire stack can be considered valid - that tape will not go scratch until the last dataset becomes uncataloged and the other uncataloged datasets can still be read and used. Unfortunately, we have customers who know this and have actually used the uncataloged datasets. Now you have to consider how you're going to replace this functionality when moving these datasets to disk. Even if you move them to the new tape technology and stack them with other datasets, you still have to consider how that's going to affect the new tape - will it ever expire? Then there are cycle-controlled datasets, expiration dates, retention periods..... ************************************************************************************** This e-mail message and all attachments transmitted with it may contain legally privileged and/or confidential information intended solely for the use of the addressee(s). If the reader of this message is not the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, forwarding or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately and delete this message and all copies and backups thereof. 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
