Max. size of pageds?
Hello, While moving to 3390-9 devices, I want to enlarge our pageds, but am not sure of the limits. >From OW54255 I found that the maximum size is now 4GB, if SADUMP must be able to process it. >From z/OS V1R3.0 DFSMS Access Method Services for Catalogs: 17.1.1 I read that the maximum size is 16M slots, so 64 GB. Is this correct? So I should limit a pageds to half a 3390-9? Kees. ** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. ** -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
>From OW54255 I found that the maximum size is now 4GB, if SADUMP must be able to process it. >From z/OS V1R3.0 DFSMS Access Method Services for Catalogs: 17.1.1 I read that the maximum size is 16M slots, so 64 GB. I remember some APARS (sorry don't have the numbers) dealing with LARGE page ds's. Check IBM link for more info... HTH, -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
"Vernooy, C.P. - SPLXM" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Hello, > > While moving to 3390-9 devices, I want to enlarge our pageds, but am not > sure of the limits. > > From OW54255 I found that the maximum size is now 4GB, if SADUMP must be > able to process it. > From z/OS V1R3.0 DFSMS Access Method Services for Catalogs: 17.1.1 I read > that the maximum size is 16M slots, so 64 GB. The current limit is 4GB. Thanks, Mark Thomen Catalog/IDCAMS/VSAM Development -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
So we'll most likely be asking customers to have MORE page packs (and for ASM to have to manage them) for a while. This assertion based on my view (driven by a little experience) that it's a rather good idea to be able to sustain dumping those large address spaces we're getting used to having. Martin Martin Packer, MBCS CITPMartin Packer/UK/IBM 020-8832-5167 in the UK (+44) (MOBX 273643, Internal 7-325167, Mobile 07802-245584) "Las cosas de palacio van despacio" External Blog: http://www-128.ibm.com/developerworks/blogs/dw_blog.jspa?blog=476 Internal Blog: http://barney.adtech.internet.ibm.com/pilot/weblogs/comments/[EMAIL PROTECTED] -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
"Mark Thomen" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>. .. > > > > > > > > "Vernooy, C.P. - SPLXM" <[EMAIL PROTECTED]> wrote in message > news:<[EMAIL PROTECTED]>... > > Hello, > > > > While moving to 3390-9 devices, I want to enlarge our pageds, but am not > > sure of the limits. > > > > From OW54255 I found that the maximum size is now 4GB, if SADUMP must be > > able to process it. > > From z/OS V1R3.0 DFSMS Access Method Services for Catalogs: 17.1.1 I read > > that the maximum size is 16M slots, so 64 GB. > > The current limit is 4GB. > > Thanks, > Mark Thomen > Catalog/IDCAMS/VSAM Development > Thanks Mark, so the 16MB slot limit is a limit that cannot be reached in practice yet. Kees. ** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. ** -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
"Martin Packer" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>. .. > So we'll most likely be asking customers to have MORE page packs (and for > ASM to have to manage them) for a while. This assertion based on my view > (driven by a little experience) that it's a rather good idea to be able to > sustain dumping those large address spaces we're getting used to having. > > Martin > Martin, you need an optimal mix of both: many and large pageds. I was exploring the limits of the latter, which appears to be 4GB. Kees. ** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. ** -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
I know customers need both large and many. My point is that if you follow my VERY INFORMAL ROT that memory should be matched by 1 x -1.5 x paging space then we get into large numbers of 4GB (a fortiori smaller) paging data sets. I'm not sure what the implications of that are, other than noting that PAV support for ASM must help. (And I actually assume that "in the old days" when paging was last something to really worry about ASM was quite capable of driving many streams of I/O (even if one did have to be careful about page data set placement). In the p$%*ing contest my social circle includes a customer with both a 96GB machine and a 90GB machine. Anybody yet in a position to p$%* higher up the wall? :-) In any case I expect those sizes to be dwarfed, going forward. Admittedly these aren't "single LPAR" machines but that doesn't really detract from my observation.; Cheers, Martin Martin Packer, MBCS CITPMartin Packer/UK/IBM 020-8832-5167 in the UK (+44) (MOBX 273643, Internal 7-325167, Mobile 07802-245584) "Las cosas de palacio van despacio" External Blog: http://www-128.ibm.com/developerworks/blogs/dw_blog.jspa?blog=476 Internal Blog: http://barney.adtech.internet.ibm.com/pilot/weblogs/comments/[EMAIL PROTECTED] -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Max. size of pageds?
"Vernooy, C.P. - SPLXM" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > "Mark Thomen" <[EMAIL PROTECTED]> wrote in message > news:<[EMAIL PROTECTED]>. > . > > > > > > > > > > > > > > > > "Vernooy, C.P. - SPLXM" <[EMAIL PROTECTED]> wrote in message > > news:<[EMAIL PROTECTED]>... > > > Hello, > > > > > > While moving to 3390-9 devices, I want to enlarge our pageds, but am not > > > sure of the limits. > > > > > > From OW54255 I found that the maximum size is now 4GB, if SADUMP must be > > > able to process it. > > > From z/OS V1R3.0 DFSMS Access Method Services for Catalogs: 17.1.1 I > read > > > that the maximum size is 16M slots, so 64 GB. > > > > The current limit is 4GB. > > > > Thanks, > > Mark Thomen > > Catalog/IDCAMS/VSAM Development > > > > Thanks Mark, so the 16MB slot limit is a limit that cannot be reached in > practice yet. That's correct, at the moment. I remember an RCF to correct this, but I don't see the change in the 1.6 doc - must be in the 1.7 doc. Thanks, Mark Thomen Catalog/IDCAMS/VSAM Development -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
