Dave, Yes I've heard that but have never seen it done without CRQ.
Regards, Hervey -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of O'Brien, David W. (NIH/CIT) [C] Sent: Thursday, October 11, 2012 8:34 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: DFHSM Recalls and Tape Hervey, That is not true, at least not at this shop. HSM routinely queues recalls according to tape volume in order to minimize tape mounts with or without CRQ. Dave O'Brien -----Original Message----- From: Hervey Martinez [mailto:hervey.marti...@custserv.com] Sent: Thursday, October 11, 2012 7:55 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: DFHSM Recalls and Tape If you have CRQ(Common Recall Queue) set up, then HSM will "look ahead" and recall all files that are on the same tape. Also, with CRQ, you can limit which LPARS will perform recalls and limit them in that manner and all recalls will be routed to that LPAR. Otherwise, the recalls happen one at a time in a FIFO manner. Regards, Hervey -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Robert A. Rosenberg Sent: Thursday, October 11, 2012 3:58 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: DFHSM Recalls and Tape At 20:58 -0500 on 10/10/2012, Mike Schwab wrote about Re: DFHSM Recalls and Tape: >When it HSM finishes a recall, it checks the que in order for any >recall on the same tape. When it reaches the end of the que, it >unmounts the tape, and starts recalling the first waiting dataset on >the que. Haven't done as massive a quantity as 10,000 though. > >No sorting of any kind, just checking the que DSN against the list on >the mounted tape. So you are saying that as it reads the tape (after it has recalled a file from the tape) it sees the next file on the tape and checks if it is on the queue. It then either recalls the file (if it is on the queue) or reads the tape to the next file and does the queue check again. From your "no sort" comment, I assume that it does not order the queue based on restore tape volume but just runs the full queue until it finds the dataset name or reaches the end of the queue. If the latter it seems inefficient since if the queue was ordered by volume serial number it could stop the scan once it reached an entry on a different tape. ---------------------------------------------------------------------- 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
