Re: [External] Re: Vtoc and index sizing based on Mods
There are still some minor issues involved w/vvds, etc. placement, but there are very moinr, and for most volumes will make zero difference. -Original Message- From: IBM Mainframe Discussion List On Behalf Of Pommier, Rex Sent: Monday, July 6, 2020 10:18 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [External] Re: Vtoc and index sizing based on Mods [CAUTION: This Email is from outside the Organization. Unless you trust the sender, Don’t click links or open attachments as it may be a Phishing email, which can steal your Information and compromise your Computer.] Hi Peter, I don't think anybody answered this question. With modern (read: emulated) boxes I've been told the location of the VTOC/VTOCIX/VVDS don't matter anymore. Back in the SLED days I was a stickler for placing the VTOC & IX 1/3 of the way into the volume, right next to each other to try to minimize head movement. Now, with it all placed on "smoke and mirrors", and with huge cache sizes, the location doesn't matter, so I place them right at the beginning of the volumes so that I have the largest possible contiguous free space - at least until the first dataset on the volume is deleted. :-) Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Peter Sent: Saturday, July 4, 2020 11:22 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [External] Re: Vtoc and index sizing based on Mods Hello Thank you so much How do we determine the location of vtoc and index ? Is it possible to place all the mod 27 in same location of cylinder and tracks ? On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, wrote: > It depends > > If the volume would have one dataset on it, like my SPOOL Volumes, > then they are very small > > If like in my TSO Pool there are lots of tiny (15 track or less) then > I make them huge. > > So it all depends on > > What the intent of the volume is (1 dataset vs Many Datasets) What > size the volume is (Mod3/9/27/54/EAV) > > You will see an error message when the VTOC or VTOIX is too small. > > > > Hope this helps > > Lizette > > > -Original Message- > From: IBM Mainframe Discussion List On > Behalf Of Peter > Sent: Saturday, July 4, 2020 10:12 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Vtoc and index sizing based on Mods > > Hello Group > > Apology for being ignorant. > > Is there a formula or any constraints for initialising a specific dasd > Mod ? > > How do arrive to a specific vtoc and index value while initialising a > dasd ? > > Please help me to understand > > Peter > > -- > 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 > -- 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 ::DISCLAIMER:: The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distri
Re: [External] Re: Vtoc and index sizing based on Mods
Hi Peter, I don't think anybody answered this question. With modern (read: emulated) boxes I've been told the location of the VTOC/VTOCIX/VVDS don't matter anymore. Back in the SLED days I was a stickler for placing the VTOC & IX 1/3 of the way into the volume, right next to each other to try to minimize head movement. Now, with it all placed on "smoke and mirrors", and with huge cache sizes, the location doesn't matter, so I place them right at the beginning of the volumes so that I have the largest possible contiguous free space - at least until the first dataset on the volume is deleted. :-) Rex -Original Message- From: IBM Mainframe Discussion List On Behalf Of Peter Sent: Saturday, July 4, 2020 11:22 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [External] Re: Vtoc and index sizing based on Mods Hello Thank you so much How do we determine the location of vtoc and index ? Is it possible to place all the mod 27 in same location of cylinder and tracks ? On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, wrote: > It depends > > If the volume would have one dataset on it, like my SPOOL Volumes, > then they are very small > > If like in my TSO Pool there are lots of tiny (15 track or less) then > I make them huge. > > So it all depends on > > What the intent of the volume is (1 dataset vs Many Datasets) What > size the volume is (Mod3/9/27/54/EAV) > > You will see an error message when the VTOC or VTOIX is too small. > > > > Hope this helps > > Lizette > > > -Original Message- > From: IBM Mainframe Discussion List On > Behalf Of Peter > Sent: Saturday, July 4, 2020 10:12 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Vtoc and index sizing based on Mods > > Hello Group > > Apology for being ignorant. > > Is there a formula or any constraints for initialising a specific dasd > Mod ? > > How do arrive to a specific vtoc and index value while initialising a > dasd ? > > Please help me to understand > > Peter > > -- > 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 > -- 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: Vtoc and index sizing based on Mods
Simple formulae: * # VTOC tracks = (max # datasets you want to have on the volume + max # datasets with > 3 extents + max # EAS datasets + 5) / 50. * # VTOCIX tracks = (max # datasets + 5) / 21; I'd let SMS take care of the VVDS; it can grow if needed. Things that should go without saying (because they're obvious): 1. If you don't know the inputs, then you'll have to estimate, or guess. 2. It's much better to make the VTOC & IX bigger than necessary than too small. sas On Mon, Jul 6, 2020 at 7:01 AM R.S. wrote: > W dniu 04.07.2020 o 19:12, Peter pisze: > > Hello Group > > > > Apology for being ignorant. > > > > Is there a formula or any constraints for initialising a specific dasd > Mod ? > > > > How do arrive to a specific vtoc and index value while initialising a > dasd ? > > > > Please help me to understand > > > > > > There is no formula. No *simple* formula. VTOC and VTOCIX size depends > on data you plan to keep on the volume. > Big number of small datasets will occupy more VTOC space. Single large > dataset will take very little space. > > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Vtoc and index sizing based on Mods
W dniu 04.07.2020 o 19:12, Peter pisze: Hello Group Apology for being ignorant. Is there a formula or any constraints for initialising a specific dasd Mod ? How do arrive to a specific vtoc and index value while initialising a dasd ? Please help me to understand There is no formula. No *simple* formula. VTOC and VTOCIX size depends on data you plan to keep on the volume. Big number of small datasets will occupy more VTOC space. Single large dataset will take very little space. Solution? If you don't know to much about datasets just use your "defaults". What defaults? I would suggest to start from values used by IBM in ServerPac Installation. Note: nowadays DASD is much cheaper than in the past. You may be more generous for VTOC. -- Radoslaw Skorupka Lodz, Poland == Jeśli nie jesteś adresatem tej wiadomości: - powiadom nas o tym w mailu zwrotnym (dziękujemy!), - usuń trwale tę wiadomość (i wszystkie kopie, które wydrukowałeś lub zapisałeś na dysku). Wiadomość ta może zawierać chronione prawem informacje, które może wykorzystać tylko adresat.Przypominamy, że każdy, kto rozpowszechnia (kopiuje, rozprowadza) tę wiadomość lub podejmuje podobne działania, narusza prawo i może podlegać karze. mBank S.A. z siedzibą w Warszawie, ul. Senatorska 18, 00-950 Warszawa,www.mBank.pl, e-mail: kont...@mbank.pl. Sąd Rejonowy dla m. st. Warszawy XII Wydział Gospodarczy Krajowego Rejestru Sądowego, KRS 025237, NIP: 526-021-50-88. Kapitał zakładowy (opłacony w całości) według stanu na 01.01.2020 r. wynosi 169.401.468 złotych. If you are not the addressee of this message: - let us know by replying to this e-mail (thank you!), - delete this message permanently (including all the copies which you have printed out or saved). This message may contain legally protected information, which may be used exclusively by the addressee.Please be reminded that anyone who disseminates (copies, distributes) this message or takes any similar action, violates the law and may be penalised. mBank S.A. with its registered office in Warsaw, ul. Senatorska 18, 00-950 Warszawa,www.mBank.pl, e-mail: kont...@mbank.pl. District Court for the Capital City of Warsaw, 12th Commercial Division of the National Court Register, KRS 025237, NIP: 526-021-50-88. Fully paid-up share capital amounting to PLN 169.401.468 as at 1 January 2020. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Vtoc and index sizing based on Mods
...and if it's an SMS volume, you also need to concern yourself about VVDS size. On Sun, 5 Jul 2020 at 12:56, Mike Schwab wrote: > Here are the VTOC sizes needed for volumes full of 1 track datasets. > > https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.ickug00/ick40744.htm > > > On Sun, Jul 5, 2020 at 4:22 AM Peter wrote: > > > > Hello > > > > Thank you so much > > > > How do we determine the location of vtoc and index ? Is it possible to > > place all the mod 27 in same location of cylinder and tracks ? > > > > On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, > > wrote: > > > > > It depends > > > > > > If the volume would have one dataset on it, like my SPOOL Volumes, then > > > they are very small > > > > > > If like in my TSO Pool there are lots of tiny (15 track or less) then I > > > make them huge. > > > > > > So it all depends on > > > > > > What the intent of the volume is (1 dataset vs Many Datasets) > > > What size the volume is (Mod3/9/27/54/EAV) > > > > > > You will see an error message when the VTOC or VTOIX is too small. > > > > > > > > > > > > Hope this helps > > > > > > Lizette > > > > > > > > > -Original Message- > > > From: IBM Mainframe Discussion List On > Behalf > > > Of Peter > > > Sent: Saturday, July 4, 2020 10:12 AM > > > To: IBM-MAIN@LISTSERV.UA.EDU > > > Subject: Vtoc and index sizing based on Mods > > > > > > Hello Group > > > > > > Apology for being ignorant. > > > > > > Is there a formula or any constraints for initialising a specific dasd > Mod > > > ? > > > > > > How do arrive to a specific vtoc and index value while initialising a > dasd > > > ? > > > > > > Please help me to understand > > > > > > Peter > > > > > > -- > > > 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 > > > > > > > -- > > 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 > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Vtoc and index sizing based on Mods
Here are the VTOC sizes needed for volumes full of 1 track datasets. https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.ickug00/ick40744.htm On Sun, Jul 5, 2020 at 4:22 AM Peter wrote: > > Hello > > Thank you so much > > How do we determine the location of vtoc and index ? Is it possible to > place all the mod 27 in same location of cylinder and tracks ? > > On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, > wrote: > > > It depends > > > > If the volume would have one dataset on it, like my SPOOL Volumes, then > > they are very small > > > > If like in my TSO Pool there are lots of tiny (15 track or less) then I > > make them huge. > > > > So it all depends on > > > > What the intent of the volume is (1 dataset vs Many Datasets) > > What size the volume is (Mod3/9/27/54/EAV) > > > > You will see an error message when the VTOC or VTOIX is too small. > > > > > > > > Hope this helps > > > > Lizette > > > > > > -Original Message- > > From: IBM Mainframe Discussion List On Behalf > > Of Peter > > Sent: Saturday, July 4, 2020 10:12 AM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Vtoc and index sizing based on Mods > > > > Hello Group > > > > Apology for being ignorant. > > > > Is there a formula or any constraints for initialising a specific dasd Mod > > ? > > > > How do arrive to a specific vtoc and index value while initialising a dasd > > ? > > > > Please help me to understand > > > > Peter > > > > -- > > 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 > > > > -- > 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: Vtoc and index sizing based on Mods
The input to ICKDSF when you format the volume. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Peter [dbajava...@gmail.com] Sent: Sunday, July 5, 2020 12:22 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Vtoc and index sizing based on Mods Hello Thank you so much How do we determine the location of vtoc and index ? Is it possible to place all the mod 27 in same location of cylinder and tracks ? On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, wrote: > It depends > > If the volume would have one dataset on it, like my SPOOL Volumes, then > they are very small > > If like in my TSO Pool there are lots of tiny (15 track or less) then I > make them huge. > > So it all depends on > > What the intent of the volume is (1 dataset vs Many Datasets) > What size the volume is (Mod3/9/27/54/EAV) > > You will see an error message when the VTOC or VTOIX is too small. > > > > Hope this helps > > Lizette > > > -Original Message- > From: IBM Mainframe Discussion List On Behalf > Of Peter > Sent: Saturday, July 4, 2020 10:12 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Vtoc and index sizing based on Mods > > Hello Group > > Apology for being ignorant. > > Is there a formula or any constraints for initialising a specific dasd Mod > ? > > How do arrive to a specific vtoc and index value while initialising a dasd > ? > > Please help me to understand > > Peter > > -- > 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 > -- 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: Vtoc and index sizing based on Mods
Hello Thank you so much How do we determine the location of vtoc and index ? Is it possible to place all the mod 27 in same location of cylinder and tracks ? On Sat, 4 Jul, 2020, 9:44 PM Lizette Koehler, wrote: > It depends > > If the volume would have one dataset on it, like my SPOOL Volumes, then > they are very small > > If like in my TSO Pool there are lots of tiny (15 track or less) then I > make them huge. > > So it all depends on > > What the intent of the volume is (1 dataset vs Many Datasets) > What size the volume is (Mod3/9/27/54/EAV) > > You will see an error message when the VTOC or VTOIX is too small. > > > > Hope this helps > > Lizette > > > -Original Message- > From: IBM Mainframe Discussion List On Behalf > Of Peter > Sent: Saturday, July 4, 2020 10:12 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Vtoc and index sizing based on Mods > > Hello Group > > Apology for being ignorant. > > Is there a formula or any constraints for initialising a specific dasd Mod > ? > > How do arrive to a specific vtoc and index value while initialising a dasd > ? > > Please help me to understand > > Peter > > -- > 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 > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Vtoc and index sizing based on Mods
It depends If the volume would have one dataset on it, like my SPOOL Volumes, then they are very small If like in my TSO Pool there are lots of tiny (15 track or less) then I make them huge. So it all depends on What the intent of the volume is (1 dataset vs Many Datasets) What size the volume is (Mod3/9/27/54/EAV) You will see an error message when the VTOC or VTOIX is too small. Hope this helps Lizette -Original Message- From: IBM Mainframe Discussion List On Behalf Of Peter Sent: Saturday, July 4, 2020 10:12 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Vtoc and index sizing based on Mods Hello Group Apology for being ignorant. Is there a formula or any constraints for initialising a specific dasd Mod ? How do arrive to a specific vtoc and index value while initialising a dasd ? Please help me to understand Peter -- 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: Vtoc and index sizing based on Mods
IBM guidelines are to support a volume filled with minimum sized datasets (1 track / 21 cylinders EAV). https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.ickug00/ick40743.htm On Sat, Jul 4, 2020 at 5:12 PM Peter wrote: > > Hello Group > > Apology for being ignorant. > > Is there a formula or any constraints for initialising a specific dasd Mod ? > > How do arrive to a specific vtoc and index value while initialising a dasd ? > > Please help me to understand > > Peter > > -- > 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
