Re: [EXTERNAL] Re: Storage questions - mod9, mod27, mod54
Tony, Thank you for setting me straight on the lack of requirement of all volumes in an LCU being the same size. I'm pretty sure my business partner had told me that was a requirement. It may have been a restriction from long ago. Our first emulated device was a DS6800 that was replaced by a DSD8870 then to a DS8910F. Is it possible that was a requirement in the early days of the DS6800 level and we just kept the idea even though the requirement vanished? Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Tony Thigpen Sent: Monday, September 11, 2023 12:21 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] Re: Storage questions - mod9, mod27, mod54 Linda, Really, you need to take those questions to your storage group. There are a lot of variables based on hardware and currently used storage in the DASD subsystem. To fix one incorrect reply, at lease on IBM DS8000, all DASD on the same LCU (FKA 'string') does *not* have to be the same size. It makes it easier for the storage group to manage if they are all the same, but it's not required. The DS8000 allocates storage in Mod-1 slices. You current addresses only have enough slices for their current size. Converting from one size to another requires deleting a volume and redefining it. The rest of the volumes don't have to be touched. There is a limit on how many slices each DS8000 is licensed for. If there are free slices, then the storage group can define you some new volumes to which you will migrate your data to. Then, they can reclaim the original slices. (Note: This leaves 'holes' in the CUU address range and some people don't like that.) Talk to your storage group. They will tell you if they can create new volumes then the data can be migrated. Or, they may require a full back-up and re-load if they don't have free slices in the DS8000. Tony Thigpen Linda Hagedorn wrote on 9/11/23 10:14 AM: > Hi, > > I hope you won't mind a storage question. > > We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, > mod54. > > I'd like to have all mod54's for Db2 and be prepared before going to the > storage folks. > > 1. Is storage virtual nowadays? > 2. Can virtual mod9s and mod27s be reconfigured to mod54s? > 3. Does the reconfiguration require an IPL? > 4. Does the reconfiguration new addressing in IODF? > 5. Is the storage vendor (IBM, EMC, etc.) relevant? Does the hardware > determine or be a factor in merging the mod9s/mod27s, into mod54s? > 6. Is it a given that the volumes must be cleared/emptied before the > reconfiguration happens? > 7. How long does reconfiguration take? > > Is there anything else I should consider before taking this request to the > storage group? > > Any information or advice is appreciated. > > Thank you. Linda Hagedorn > > -- > 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: Storage questions - mod9, mod27, mod54
Linda, Really, you need to take those questions to your storage group. There are a lot of variables based on hardware and currently used storage in the DASD subsystem. To fix one incorrect reply, at lease on IBM DS8000, all DASD on the same LCU (FKA 'string') does *not* have to be the same size. It makes it easier for the storage group to manage if they are all the same, but it's not required. The DS8000 allocates storage in Mod-1 slices. You current addresses only have enough slices for their current size. Converting from one size to another requires deleting a volume and redefining it. The rest of the volumes don't have to be touched. There is a limit on how many slices each DS8000 is licensed for. If there are free slices, then the storage group can define you some new volumes to which you will migrate your data to. Then, they can reclaim the original slices. (Note: This leaves 'holes' in the CUU address range and some people don't like that.) Talk to your storage group. They will tell you if they can create new volumes then the data can be migrated. Or, they may require a full back-up and re-load if they don't have free slices in the DS8000. Tony Thigpen Linda Hagedorn wrote on 9/11/23 10:14 AM: Hi, I hope you won't mind a storage question. We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, mod54. I'd like to have all mod54's for Db2 and be prepared before going to the storage folks. 1. Is storage virtual nowadays? 2. Can virtual mod9s and mod27s be reconfigured to mod54s? 3. Does the reconfiguration require an IPL? 4. Does the reconfiguration new addressing in IODF? 5. Is the storage vendor (IBM, EMC, etc.) relevant? Does the hardware determine or be a factor in merging the mod9s/mod27s, into mod54s? 6. Is it a given that the volumes must be cleared/emptied before the reconfiguration happens? 7. How long does reconfiguration take? Is there anything else I should consider before taking this request to the storage group? Any information or advice is appreciated. Thank you. Linda Hagedorn -- 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: Storage questions - mod9, mod27, mod54
The absolutely easiest way is to use TDMF, FDRPAS, etc., to move your existing volumes to the new larger volumes on the new storage unit. You then run ICKDSF to pick up the new size. If your VTOC size is pretty small you may run out of VTOC entries if you have lots of small datasets on the volume. And if you have lots of free space on some volumes after the move, you can disable new the volumes you want to return until they are empty. TDMF did include software to replicate datasets to a different volume then rename when it is closed. You might consider doing a few EAV volumes for experimenting with then using for your largest storage group. Maybe MOD 108 (128K Cylinders). (And if you do, the Hercules group would like to see backups of a few VTOC records used by EAV high datasets.) On Mon, Sep 11, 2023 at 9:14 AM Linda Hagedorn wrote: > > Hi, > > I hope you won't mind a storage question. > > We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, > mod54. > > I'd like to have all mod54's for Db2 and be prepared before going to the > storage folks. > > 1. Is storage virtual nowadays? > 2. Can virtual mod9s and mod27s be reconfigured to mod54s? > 3. Does the reconfiguration require an IPL? > 4. Does the reconfiguration new addressing in IODF? > 5. Is the storage vendor (IBM, EMC, etc.) relevant? Does the hardware > determine or be a factor in merging the mod9s/mod27s, into mod54s? > 6. Is it a given that the volumes must be cleared/emptied before the > reconfiguration happens? > 7. How long does reconfiguration take? > > Is there anything else I should consider before taking this request to the > storage group? > > Any information or advice is appreciated. > > Thank you. Linda Hagedorn > > -- > 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: Storage questions - mod9, mod27, mod54
Answers below. W dniu 11.09.2023 o 16:14, Linda Hagedorn pisze: Hi, I hope you won't mind a storage question. We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, mod54. I'd like to have all mod54's for Db2 and be prepared before going to the storage folks. 1. Is storage virtual nowadays? Of course, YES. It have been virtual for decades. 2. Can virtual mod9s and mod27s be reconfigured to mod54s? Well, yes and no. No - you cannot automagically say "englarge my volume", even if you are Harry Potter. Yes - you can change your DASD array, i.e. destroy all the volumes on given RAID group and re-create another bunch o volumes, larger ones. Details depend on you disk vendor, your needs, capacity, etc. (theoretically enlarge on the fly is also possible, but.. usually not) 3. Does the reconfiguration require an IPL? No, but it requires at least offline to your volumes. Note, you can even buy new disk system and start using it without the IPL. 4. Does the reconfiguration new addressing in IODF? Usually yes - you will have less bigger volumes. 5. Is the storage vendor (IBM, EMC, etc.) relevant? Does the hardware determine or be a factor in merging the mod9s/mod27s, into mod54s? Yes, every supplier has it's own way of disk system management. No, the factor is the same - you simply cut the space in GB. 6. Is it a given that the volumes must be cleared/emptied before the reconfiguration happens? Yes, your disks will be destroyed. All of them? No. 7. How long does reconfiguration take? Hours to months, depending on details. Is there anything else I should consider before taking this request to the storage group? You should start from that point. Just talk to them. -- Radoslaw Skorupka Lodz, Poland -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: [EXTERNAL] Storage questions - mod9, mod27, mod54
Hi Linda, "A question"??? I see 9 of them! LOL I intermixed my responses below. I'm sure there are others out there who have more current info than I have but thought I'd get the conversation going. Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Linda Hagedorn Sent: Monday, September 11, 2023 9:14 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] Storage questions - mod9, mod27, mod54 Hi, I hope you won't mind a storage question. We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, mod54. I'd like to have all mod54's for Db2 and be prepared before going to the storage folks. 1. Is storage virtual nowadays? Yes, it's probably been over 20 years since the last "real" 3390 was supported. 2. Can virtual mod9s and mod27s be reconfigured to mod54s?Yes 3. Does the reconfiguration require an IPL? This is a better question for your hardware vendor but I would think not. 4. Does the reconfiguration new addressing in IODF?This is a better question for your hardware vendor but I would think not. We were able to remove some addresses from disk ranges to convert to PAV volumes without having to relabel the remaining volumes so I would think resizing volumes would be similar. 5. Is the storage vendor (IBM, EMC, etc.) relevant? Shouldn't. 5a. Does the hardware determine or be a factor in merging the mod9s/mod27s, into mod54s? No, I've played with EMC, Hitachi, IBMN storage over the years and all have the capability. 6. Is it a given that the volumes must be cleared/emptied before the reconfiguration happens? Unless things have change that I'm not aware of, yes - see below. 7. How long does reconfiguration take? This is a better question for your hardware vendor, but it is going to depend on how many volumes you're creating etc. Is there anything else I should consider before taking this request to the storage group? Again, unless things have changed, I believe the entire string of volumes needs to be the same size. Every time we've wanted to resize a string of volumes we've had to deconfigure the old volumes in the array, sending the storage back to free space, then rebuild the new volumes from free space. Any information or advice is appreciated. Thank you. Linda Hagedorn -- 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
Storage questions - mod9, mod27, mod54
Hi, I hope you won't mind a storage question. We're running zOS 2.4 and have a smattering of volume sizes - mod9, mod27, mod54. I'd like to have all mod54's for Db2 and be prepared before going to the storage folks. 1. Is storage virtual nowadays? 2. Can virtual mod9s and mod27s be reconfigured to mod54s? 3. Does the reconfiguration require an IPL? 4. Does the reconfiguration new addressing in IODF? 5. Is the storage vendor (IBM, EMC, etc.) relevant? Does the hardware determine or be a factor in merging the mod9s/mod27s, into mod54s? 6. Is it a given that the volumes must be cleared/emptied before the reconfiguration happens? 7. How long does reconfiguration take? Is there anything else I should consider before taking this request to the storage group? Any information or advice is appreciated. Thank you. Linda Hagedorn -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
