David, You can allocate the stripe chunks using a Guarenteed Space STORCLAS and UNIT COUNT specified in the DTACLAS or JCL. In this case it will always give you stripes equal to the UNIT COUNT with space for each chunk equal to the Primary space requested. My experience is that this is more commonly used in shops that have leveraged striping in a large way.
For Data Rate allocations SMS will not fail the allocation if Primary Space cannot be satisfied. It will try again requesting fewer, larger datasets. You always get the space you want, but not necessarily the throughput (then again, you are asking in multiples of 4MB/sec). Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of David Andrews > Sent: Monday, April 07, 2008 9:09 AM > To: [email protected] > Subject: Re: [IBM-MAIN] Sequential Data Striping > > On Mon, 2008-04-07 at 08:31 -0700, Ron Hawkins wrote: > > If you are using data rate to allocate your stripes > > Isn't that the *only* way to control striping? My notes say you get > one > stripe for every 4MB/sec you specify in Sustained Data Rate. > > (I have STRIPED2, STRIPED4 and STRIPED8 storage classes, with > appropriate SDR values. These are selected from my SC ACS routine > based > on the dataset's &SIZE. Kind of a kluge, but I wanted large datasets > to > be striped in varying degrees, FSVO "large".) > > > you don't always get the number of stripes you requested. > > I haven't seen this, but I have plenty of space. Why does this happen? > > -- > David Andrews > A. Duda and Sons, Inc. > [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 ---------------------------------------------------------------------- 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
