I am referring to primary space management. When I say " dsns are not being migrated often enough' I meant to say that the dsns in the storage group are not ALL being migrated when SP is run. To fix the problem I migrate the volume - HSEND MIGRATE VOLUME(RPM105 MIGRATE(0)) - and lots of space is now available. Is the cause related to the thresholds settings? What could I do instead of having to migrate the volume? Should I lower the Allocation/Migration Threshold from 85 to 40? Thanks
________________________________ From: retired mainframer <[email protected]> To: [email protected] Sent: Sunday, June 9, 2013 1:49:18 PM Subject: Re: DFHSM QUESTION : Allocation/migration Threshold: High . . 95 (1-99) Low . . 80 (0-99) What do you mean by often enough? A dataset cannot be migrated repeatedly. A dataset can go from ML0 to ML1 only once and then from ML1 to ML2 only once. With the appropriate settings for management class, it can go directly from ML0 to ML2 but still only once. Are you concerned about primary space management or interval migration? The thresholds are used to determine if HSM should consider the datasets on the pack for migration. It is still the management class settings which determine if a dataset is eligible to be migrated. If you read the manual, you will learn that the low threshold (not high) determines if datasets on a volume should be considered for migration. To help you resolve your question, we need the following data collected from the active ACDS immediately after the situation occurs: The complete ISMF storage group display for the storage group. The ISMF (or D SMS) volume display for the storage group. The ISMF (or QuickRef) display for the volume showing usage percent. The LISTCAT output showing the management class for a "skipped" dataset. The complete ISMF management class display for that class. A listing (such as 3.4) showing dataset attributes such as volume and last reference date. :>: -----Original Message----- :>: From: IBM Mainframe Discussion List [mailto:[email protected]] On :>: Behalf Of willie bunter :>: Sent: Sunday, June 09, 2013 8:26 AM :>: To: [email protected] :>: Subject: DFHSM QUESTION : Allocation/migration Threshold: High . . 95 :>: (1-99) Low . . 80 (0-99) :>: :>: Good Day, :>: :>: I have a problem with primary ML0 SMS managed pool which for some reason :>: the dsns are not being migrated often enough. The setup is as follows : :>: Allocation/migration Threshold : High 85 (1-100) Low . . :>: 1 (0-99) :>: Alloc/Migr Threshold Track-Managed: High 85 (1-100) Low . . :>: 1 (0-99) :>: Guaranteed Backup Frequency . . . . . . NOLIMIT (1 to 9999 or :>: NOLIMIT) :>: BreakPointValue . . . . . . . . . . . . (0-65520 or :>: blank) :>: :>: If I lower the Allocation/migration Threshold High to 55 would that do :>: the trick when Space management runs? :>: :>: Thanks. :>: :>: ---------------------------------------------------------------------- :>: For IBM-MAIN subscribe / signoff / archive access instructions, :>: send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
