You are right, I didn't notice before, it only applies for VSAM. Then the limit is 255 extents per component, and you can remove this limit using the "Extent constraint removal" (put a value of "YES" in it)
On Wed, May 4, 2011 at 4:15 AM, ibmnew <[email protected]> wrote: > > Dear > > > > Add'l Volume Amount, This attribute is used during VSAM EOV processing, > and is only applicable to any VSAM multivolume data sets > allocated in the extended format. > > Is it only used for any VSAM multivolume data sets? > > Thanks a lot! > > Best Regards, > > Jason Cai > > > > > 发件人： Gonzalo Cengotita > 发送时间： 2011-05-03 19:25:48 > 收件人： IBM-MAIN > 抄送： > 主题： Re: Add'l Volume Amount > > On Tue, May 3, 2011 at 12:57 PM, ibmnew <[email protected]> wrote: > > Dear > > > > > > >It means that if the dataset is multivolume, when it expands to another > > >volume you can decide wether you want to use the amount of the primary > > >allocation or the amount of the secondary allocation to expand. > > >Suppose you have a dataset created with SPACE=10,5 cylinders > > > > What situation do dataset expands to another volume ? > > > If the dataset is full, it will extent 5 cylinders. > > > > When it extent 5 cylinders,the volume is full. In this situation,does > > dataset expand to another volume? > > > Yes, if the dataset is multivolume > > Then it will : > > > > >If you filled with "primary" value the dataset wil try allocations in > new > > >volumes with 10 cylinders > > >If you filled with "Secondary" value the dataset will try allocations in > > new > > >volumes with 5 cylinders > > > > > > does it mean that if volume isn't full,dataset always extent 5 cylinders > > and if volume is full,dataset always extent 10 cylinders? > > > > Yes, if you fill this field with "Primary" > > > > What is benefit of Add'l Volume Amount ? > > > You could have a large pool of many disks with a lot of fragmentation and > in > this situation, you will prefer "secondary" amount wich is usually less > than > primary. > Keep in mind that the quantity of the allocation must be found all in one > piece, no fragmentation is allowed, so you will get less errors if the > allocation in a new volume try with the lesser value. > (The example would be better if the dataset would have SPACE=2000,50 > cylinders) > Of course all of it depends on the size of the dataset, and the number of > disks, etc > I hope it is clear enough, English is not my mother tongue, too! > Regards > Gonzalo Cengotita > > ---------------------------------------------------------------------- > > 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 > > > -- > Gonzalo Cengotita Quirce > ---------------------------------------------------------------------- > 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 > -- Gonzalo Cengotita Quirce ---------------------------------------------------------------------- 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
