Hervey, I did this at a previous site but it was a very small system. My entire ML2 environment fit quite nicely on 10 mod54 volumes with room to spare. I also had the luxury of being able to perform a complete full volume backup of my entire DASD subsystem (including the ML2 volumes) every night - to a single 3592 tape (well, 2 including the duplex volume). If you are much bigger than that, you will run into various pitfalls like Lizette has mentioned, including where do you go when you start running out of space on your ML2 pool, how do you back your ML2 up (or do you not back it up and hope that it is only unneeded data that somebody is afraid to delete), what is your site's purpose for using ML2, and so on.
In the case of my previous job, the ML2 data was pretty much restricted to older GDG generations that were spun off more as a convenience than anything else. Due to the more transitory nature of my ML2 environment, it made sense to put it to disk and eliminate the constant churning of ML2 tape recycling. If you are using yours for more long-term storage where you don't have a constant churn, tape may still be the best bet, and possibly making more use of ML1 for the short-term migration needs might better fit your environment. Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Hervey Martinez Sent: Tuesday, November 18, 2014 9:13 AM To: [email protected] 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:[email protected]] On Behalf Of George Rodriguez Sent: Tuesday, November 18, 2014 9:39 AM To: [email protected] 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 < [email protected]> 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 [email protected] with the message: INFO IBM-MAIN > -- *Disclaimer: *Under Florida law, e-mail addresses are public records. If you do not want your e-mail address released in response to a public records request, do not send electronic mail to this entity. Instead, contact this office by phone or in writing. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] 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 '[email protected]'. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN The information contained in this message is confidential, protected from disclosure and may be legally privileged. If the reader of this message is not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any disclosure, distribution, copying, or any action taken or action omitted in reliance on it, is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
