HSM ML2 on disk
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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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 < hervey.marti...@custserv.com> 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 lists...@listserv.ua.edu 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
There is a thread (and yes it is Mine) on IBM MAIN Archives https://listserv.ua.edu/cgi-bin/wa?A2=ind1408&L=IBM-MAIN&P=R53605&I=-3&X=FED 837FA3AD00EC1A4&d=No+Match%3BMatch%3BMatches This discussion was on HSM and DASD ML2 One commenter provided this While control unit storage tiering may be considered as a replacement to HSM processing for smaller environments, such a recommendation is an over simplification of the need for a comprehensive ILM strategy to properly manage data in middle-to-large environments. At the various conferences that I attend each year, this concept was originally discussed when cu tiering was first introduced, but after discussions, all three vendors see the value of HSM ILM and cu tiering being used together to create a powerful solution as opposed trying to select one over another. Each tiering technique, hardware and software, has strengths and weaknesses. Using each technique to its strengths provides tremendous opportunity as we move forward with managing the significant growth of data that we are seeing. In z/OS V2R1, DFSMS introduced its initial Storage Tiering solution. This offering lays the framework for z/OS's long term strategy to provide various ILMs solutions so that clients can implement the ILM solution that works best for them. An integral part of this strategy is to move away from ML1 and move toward an L0 - Ln, ML2 solution. Tape is still clearly the best storage media for long-term data archiving, and all three vendors will agree to that. I am currently working with clients to move to an L0 - Ln, ML2 environment, and it is exciting to see the opportunities that exist by integrating software and hardware tiering into a single, powerful ILM strategy. I'm more than happy to meet with clients to discuss the V2R1 DFSMS Storage Tiering solution and discuss the opportunities that it provides to exploit the strengths of the two types of tiering. Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Hervey Martinez > Sent: Tuesday, November 18, 2014 7:18 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: HSM ML2 on disk > > 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
Sorry about the wrap, here is the tinyurl http://tinyurl.com/prpqnee Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Lizette Koehler > Sent: Tuesday, November 18, 2014 8:02 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: HSM ML2 on disk > > There is a thread (and yes it is Mine) on IBM MAIN Archives > https://listserv.ua.edu/cgi-bin/wa?A2=ind1408&L=IBM-MAIN&P=R53605&I=- > 3&X=FED > 837FA3AD00EC1A4&d=No+Match%3BMatch%3BMatches > > This discussion was on HSM and DASD ML2 > > One commenter provided this > > While control unit storage tiering may be considered as a replacement to HSM > processing for smaller environments, such a recommendation is an over > simplification of the need for a comprehensive ILM strategy to properly manage > data in middle-to-large environments. At the various conferences that I attend each > year, this concept was originally discussed when cu tiering was first introduced, but > after discussions, all three vendors see the value of HSM ILM and cu tiering being > used together to create a powerful solution as opposed trying to select one over > another. Each tiering technique, hardware and software, has strengths and > weaknesses. Using each technique to its strengths provides tremendous > opportunity as we move forward with managing the significant growth of data that > we are seeing. In z/OS V2R1, DFSMS introduced its initial Storage Tiering solution. > This offering lays the framework for z/OS's long term strategy to provide various > ILMs solutions so that clients can implement the ILM solution that works best for > them. An integral part of this strategy is to move away from ML1 and move toward > an L0 - Ln, ML2 solution. Tape is still clearly the best storage media for long-term > data archiving, and all three vendors will agree to that. I am currently working with > clients to move to an L0 - Ln, ML2 environment, and it is exciting to see the > opportunities that exist by integrating software and hardware tiering into a single, > powerful ILM strategy. I'm more than happy to meet with clients to discuss the > V2R1 DFSMS Storage Tiering solution and discuss the opportunities that it provides > to exploit the strengths of the two types of tiering. > > > Lizette > > > > -Original Message- > > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > > On Behalf Of Hervey Martinez > > Sent: Tuesday, November 18, 2014 7:18 AM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: HSM ML2 on disk > > > > 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of George Rodriguez Sent: Tuesday, November 18, 2014 9:39 AM To: IBM-MAIN@LISTSERV.UA.EDU 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 < hervey.marti...@custserv.com> 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 lists...@listserv.ua.edu 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 lists...@listserv.ua.edu 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 'phish...@timeinc.com'. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
Lizette, I saw your initial question on the link you provided but did not see any comments like the one you included below. Regards, Hervey -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Lizette Koehler Sent: Tuesday, November 18, 2014 10:02 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: HSM ML2 on disk There is a thread (and yes it is Mine) on IBM MAIN Archives https://listserv.ua.edu/cgi-bin/wa?A2=ind1408&L=IBM-MAIN&P=R53605&I=-3&X=FED 837FA3AD00EC1A4&d=No+Match%3BMatch%3BMatches This discussion was on HSM and DASD ML2 One commenter provided this While control unit storage tiering may be considered as a replacement to HSM processing for smaller environments, such a recommendation is an over simplification of the need for a comprehensive ILM strategy to properly manage data in middle-to-large environments. At the various conferences that I attend each year, this concept was originally discussed when cu tiering was first introduced, but after discussions, all three vendors see the value of HSM ILM and cu tiering being used together to create a powerful solution as opposed trying to select one over another. Each tiering technique, hardware and software, has strengths and weaknesses. Using each technique to its strengths provides tremendous opportunity as we move forward with managing the significant growth of data that we are seeing. In z/OS V2R1, DFSMS introduced its initial Storage Tiering solution. This offering lays the framework for z/OS's long term strategy to provide various ILMs solutions so that clients can implement the ILM solution that works best for them. An integral part of this strategy is to move away from ML1 and move toward an L0 - Ln, ML2 solution. Tape is still clearly the best storage media for long-term data archiving, and all three vendors will agree to that. I am currently working with clients to move to an L0 - Ln, ML2 environment, and it is exciting to see the opportunities that exist by integrating software and hardware tiering into a single, powerful ILM strategy. I'm more than happy to meet with clients to discuss the V2R1 DFSMS Storage Tiering solution and discuss the opportunities that it provides to exploit the strengths of the two types of tiering. Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Hervey Martinez > Sent: Tuesday, November 18, 2014 7:18 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: HSM ML2 on disk > > 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 lists...@listserv.ua.edu 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 'phish...@timeinc.com'. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
Hervey What is driving the need to move from TAPE to DASD? Which is less cost - Tape or Dasd? Going to dasd will require lots of dasd over time. With tape you can stick it on a shelf. On DASD you can only buy more Which has the High Availability that you need? How stable is your DASD vs. TAPE If you lose you "disk" file of a tape then you lose everything. If a tape cartridge goes bad, it may be possible to recover it any way. We went pure tapeless in my shop. Recalls and migrations are faster (much faster). But I am needing to add more storage perhaps faster than I did when I just had to purchase tapes. There is less wasted space on virtual tape. I have 300GB tape files defined. But if a file is only 100KB then that is all that is used. I no longer waste a whole 300GB tape. Hope this helps. Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Hervey Martinez > Sent: Tuesday, November 18, 2014 8:13 AM > To: IBM-MAIN@LISTSERV.UA.EDU > 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:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of George Rodriguez > Sent: Tuesday, November 18, 2014 9:39 AM > To: IBM-MAIN@LISTSERV.UA.EDU > 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 < > hervey.marti...@custserv.com> 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
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:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Hervey Martinez Sent: Tuesday, November 18, 2014 9:13 AM To: IBM-MAIN@LISTSERV.UA.EDU 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:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of George Rodriguez Sent: Tuesday, November 18, 2014 9:39 AM To: IBM-MAIN@LISTSERV.UA.EDU 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 < hervey.marti...@custserv.com> 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 lists...@listserv.ua.edu 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 lists...@listserv.ua.edu 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 'phish...@timeinc.com'. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
W dniu 2014-11-18 o 15:17, Hervey Martinez pisze: 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. Why on disk? What is your goal? Some thoughts: * If you have enough disk space you can use ML1 and never migrate to ML2. BTDT. * Virtual tape is some kind of disk, so ML2 on virtual tape is actually on disk. Depending on the solution it can be further migrated to real tape, but it not need to. * The pitfalls are always the same: - disk has limited capacity, you cannot simply add some cartridges. - disk used to be more expensive. For large capacities it is more expensive. Over the years the "large" definition is growing up, as well as capacities of tapes and disks. - disk can be replicated using host-independent methods - goodfor DR. - HSM tapes can also be replicated, so why disks? - each HW solution has its EOL (end of live). You will have to migrate the data to next HW. HTH -- Radoslaw Skorupka Lodz, Poland --- Tre tej wiadomoci moe zawiera informacje prawnie chronione Banku przeznaczone wycznie do uytku subowego adresata. Odbiorc moe by jedynie jej adresat z wyczeniem dostpu osób trzecich. Jeeli nie jeste adresatem niniejszej wiadomoci lub pracownikiem upowanionym do jej przekazania adresatowi, informujemy, e jej rozpowszechnianie, kopiowanie, rozprowadzanie lub inne dziaanie o podobnym charakterze jest prawnie zabronione i moe by karalne. Jeeli otrzymae t wiadomo omykowo, prosimy niezwocznie zawiadomi nadawc wysyajc odpowied oraz trwale usun t wiadomo wczajc w to wszelkie jej kopie wydrukowane lub zapisane na dysku. This e-mail may contain legally privileged information of the Bank and is intended solely for business use of the addressee. This e-mail may only be received by the addressee and may not be disclosed to any third parties. If you are not the intended addressee of this e-mail or the employee authorized to forward it to the addressee, be advised that any dissemination, copying, distribution or any other similar activity is legally prohibited and may be punishable. If you received this e-mail by mistake please advise the sender immediately by using the reply facility in your e-mail software and delete permanently this e-mail including any copies of it either printed or saved to hard drive. mBank S.A. z siedzib w Warszawie, ul. Senatorska 18, 00-950 Warszawa, www.mBank.pl, e-mail: kont...@mbank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 025237, NIP: 526-021-50-88. Wedug stanu na dzie 01.01.2014 r. kapita zakadowy mBanku S.A. (w caoci wpacony) wynosi 168.696.052 zote. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
Lizette, I don't know what is the driving force for this since we converted to a VTS and been using it about 2 years; my manager asked about it and I said, I don't think it can be done then started thinking about housekeeping such as recycling and thought I'd ask. Regards, Hervey -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Lizette Koehler Sent: Tuesday, November 18, 2014 10:27 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: HSM ML2 on disk Hervey What is driving the need to move from TAPE to DASD? Which is less cost - Tape or Dasd? Going to dasd will require lots of dasd over time. With tape you can stick it on a shelf. On DASD you can only buy more Which has the High Availability that you need? How stable is your DASD vs. TAPE If you lose you "disk" file of a tape then you lose everything. If a tape cartridge goes bad, it may be possible to recover it any way. We went pure tapeless in my shop. Recalls and migrations are faster (much faster). But I am needing to add more storage perhaps faster than I did when I just had to purchase tapes. There is less wasted space on virtual tape. I have 300GB tape files defined. But if a file is only 100KB then that is all that is used. I no longer waste a whole 300GB tape. Hope this helps. Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Hervey Martinez > Sent: Tuesday, November 18, 2014 8:13 AM > To: IBM-MAIN@LISTSERV.UA.EDU > 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:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of George Rodriguez > Sent: Tuesday, November 18, 2014 9:39 AM > To: IBM-MAIN@LISTSERV.UA.EDU > 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 < > hervey.marti...@custserv.com> 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 lists...@listserv.ua.edu 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 'phish...@timeinc.com'. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
What you can do is adjust your ML1 / ML2 threshold size and Small Dataset Set Packing size. Increase them and more datasets go to ML1. Decrease them and they go to ML2. Adjust number of ML1 volumes as needed and you have the capacity for. When we got out VTAPE system, the ML2 recalls were faster than the dasd recalls, so we went down to the bare minimum (VTOC backups). We implements a threshold of 1MB ML1 50KB SDSP and have a few Mod 3s in use. Cut way down on the number of datasets written and volumes to recycle. On Tue, Nov 18, 2014 at 11:11 AM, Hervey Martinez wrote: > Lizette, > > I don't know what is the driving force for this since we converted to a VTS > and been using it about 2 years; my manager asked about it and I said, I > don't think it can be done then started thinking about housekeeping such as > recycling and thought I'd ask. > > Regards, > > Hervey > > > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Lizette Koehler > Sent: Tuesday, November 18, 2014 10:27 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: HSM ML2 on disk > > Hervey > > What is driving the need to move from TAPE to DASD? > Which is less cost - Tape or Dasd? Going to dasd will require lots of dasd > over time. With tape you can stick it on a shelf. On DASD you can only buy > more Which has the High Availability that you need? > How stable is your DASD vs. TAPE > > If you lose you "disk" file of a tape then you lose everything. If a tape > cartridge goes bad, it may be possible to recover it any way. > > We went pure tapeless in my shop. Recalls and migrations are faster (much > faster). But I am needing to add more storage perhaps faster than I did when > I just had to purchase tapes. > There is less wasted space on virtual tape. I have 300GB tape files defined. > But if a file is only 100KB then that is all that is used. I no longer > waste a whole 300GB tape. > > Hope this helps. > > Lizette > > >> -Original Message- >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] >> On Behalf Of Hervey Martinez >> Sent: Tuesday, November 18, 2014 8:13 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> 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:IBM-MAIN@LISTSERV.UA.EDU] >> On Behalf Of George Rodriguez >> Sent: Tuesday, November 18, 2014 9:39 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> 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 < >> hervey.marti...@custserv.com> 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 > lists...@listserv.ua.edu 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 'phish...@timeinc.com'. > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: HSM ML2 on disk
Hi, The HSM ML2 Disk support is very basic with no plans to enhance it. For clients who don't want physical tape anymore (for whatever reason), they generally select either a disk-only VTS ML2 or implement all ML1. If you go all ML1, I would recommend implementing ML1 Overflow volumes to help ensure that you have space for larger data sets. For ML1 Overflow volumes, the selection algorithm selects the volume with the least amount of freespace that will contain the data set, in order to maximize the most amount of freespace on the volumes. (Standard ML1 selection chooses the volume with the most freespace which results in volumes getting filled evenly but not leaving any volume with a significant amount of freespace for larger data sets). Evey client that I have talked to that has implemented a large disk-cache VTS is very pleased with the HSM improvements. For large customers and those who need to minimize storage costs, the VTS also has backend physical tape. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
