Re: HSM Recycle command
Hmmm... Well, first of all, "display" doesn't "DO" anything, you need to use the EXECUTE parm instead, plus just doing ML2 won't really help your BACKUPS. You also need to expire the backup volumes via a completely different command. When you say a percent of zero, that only frees up volumes with zero percent used, so if you have 100 volumes with one or two small datasets on them, they will never be freed up. If you say 100 percent, then you will recycle every tape whether they are empty or full (just so you know, that's not a good idea unless you are changing volumes for some reason and need to move it all). I have been at sites that never had expired their backups and one run would release hundreds of thousands of obsolete datasets. You probably need to run the expirebv and recycle commands on a weekly basis. As for what percentage to use, I normally use 25%, but I sometimes use a higher number if there is a reason for it. Most sites are using virtual tape, so unless number of tapes being used is a big deal you really don't need to be overly aggressive. That said, you will probably find that most people use a higher number than 25%, but it's completely up to the person who is taking care of HSM, and how they feel about scheduling the job. Just make sure that whatever ID schedules the job is in the HSM parms to be allowed to do so or you will wonder why nothing ever gets done when you run the job. :) I think if you do a google search you will find a presentation that rocket software (or someone else did) that gives you some rules of thumb and (more importantly) why. Brian -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: [EXTERNAL] HSM Recycle command
Yes, it would then (if you change the DISPLAY to EXECUTE :-) ) migrate any still-valid datasets off tapes at 5% or lower utilization to different tapes, thus emptying the targeted tape and then scratch/recycle them. Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Peter Sent: Monday, July 25, 2022 12:01 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [EXTERNAL] HSM Recycle command Yes with percentage 0 it means to delete the empty tapes (virtual in my case) So to execute (delete) with percentage 5 is fine I believe? On Mon, Jul 25, 2022, 8:58 PM Pommier, Rex wrote: > Hi Peter, > > Does this command even do anything? I'm not an HSM guru but > PERCENTVALID(0) says only process if the tape is empty. Doesn't HSM > automatically recycle empty tapes? If you want to recycle tapes that > are getting close to empty you need to increase the 0. I would try > running it with 5 or 10 with the DISPLAY on to see what quantity of > tapes will get recycled if you actually execute it. > > You have DISPLAY - which I believe tells HSM to only report eligible > tapes, but not do anything with them. I believe you would need to > change that to EXECUTE to have HSM actually do anything with the tapes. > > We have our HSM recycling tapes at 30%. This is a holdover from when > we had a physical library with a limited number of tapes in it. We > could probably lower that number since our VTS is using virtual 3490s > instead of high capacity TS11xx tapes so burning a few virtual tapes > to lower the churn would probably be OK. > > Rex > > -Original Message- > From: IBM Mainframe Discussion List On > Behalf Of Peter > Sent: Monday, July 25, 2022 11:37 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: [EXTERNAL] HSM Recycle command > > Hello > > Just trying to understand the best practices of using HSEND RECYCLE > ML2 DISPLAY PERCENTVALID(0) > > What percentage valid is appropriate or what is best to execute? > > Right now I do with zero but is it ok to do with with little higher > percentage 5 ? > > Peter > > -- > 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 > -- 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: [EXTERNAL] HSM Recycle command
Yes with percentage 0 it means to delete the empty tapes (virtual in my case) So to execute (delete) with percentage 5 is fine I believe? On Mon, Jul 25, 2022, 8:58 PM Pommier, Rex wrote: > Hi Peter, > > Does this command even do anything? I'm not an HSM guru but > PERCENTVALID(0) says only process if the tape is empty. Doesn't HSM > automatically recycle empty tapes? If you want to recycle tapes that are > getting close to empty you need to increase the 0. I would try running it > with 5 or 10 with the DISPLAY on to see what quantity of tapes will get > recycled if you actually execute it. > > You have DISPLAY - which I believe tells HSM to only report eligible > tapes, but not do anything with them. I believe you would need to change > that to EXECUTE to have HSM actually do anything with the tapes. > > We have our HSM recycling tapes at 30%. This is a holdover from when we > had a physical library with a limited number of tapes in it. We could > probably lower that number since our VTS is using virtual 3490s instead of > high capacity TS11xx tapes so burning a few virtual tapes to lower the > churn would probably be OK. > > Rex > > -Original Message- > From: IBM Mainframe Discussion List On Behalf > Of Peter > Sent: Monday, July 25, 2022 11:37 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: [EXTERNAL] HSM Recycle command > > Hello > > Just trying to understand the best practices of using HSEND RECYCLE ML2 > DISPLAY PERCENTVALID(0) > > What percentage valid is appropriate or what is best to execute? > > Right now I do with zero but is it ok to do with with little higher > percentage 5 ? > > Peter > > -- > 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 > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: [EXTERNAL] HSM Recycle command
Hi Peter, Does this command even do anything? I'm not an HSM guru but PERCENTVALID(0) says only process if the tape is empty. Doesn't HSM automatically recycle empty tapes? If you want to recycle tapes that are getting close to empty you need to increase the 0. I would try running it with 5 or 10 with the DISPLAY on to see what quantity of tapes will get recycled if you actually execute it. You have DISPLAY - which I believe tells HSM to only report eligible tapes, but not do anything with them. I believe you would need to change that to EXECUTE to have HSM actually do anything with the tapes. We have our HSM recycling tapes at 30%. This is a holdover from when we had a physical library with a limited number of tapes in it. We could probably lower that number since our VTS is using virtual 3490s instead of high capacity TS11xx tapes so burning a few virtual tapes to lower the churn would probably be OK. Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Peter Sent: Monday, July 25, 2022 11:37 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] HSM Recycle command Hello Just trying to understand the best practices of using HSEND RECYCLE ML2 DISPLAY PERCENTVALID(0) What percentage valid is appropriate or what is best to execute? Right now I do with zero but is it ok to do with with little higher percentage 5 ? Peter -- 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
HSM Recycle command
Hello Just trying to understand the best practices of using HSEND RECYCLE ML2 DISPLAY PERCENTVALID(0) What percentage valid is appropriate or what is best to execute? Right now I do with zero but is it ok to do with with little higher percentage 5 ? Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
