Ted,

 

> 

> According to our service provider there is. They are

> tendering to replace our entire mainframe DASD farm. And,

> HDS and IBM's sizes to replace are larger by the

> difference between the HIPERVOLUMES and a -1, times the

> number of HYPERVOLUMES.

> -teD

 

What does that mean exactly? 

 

We also support the equivalent of Hipervolumes, which means that once you
have formatted the Array Group to a standard size (you choose the size) the
leftover bit space can also be formatted as a small volume. Great for things
like JES2 Checkpoints, catalogs, RACF Primary, etc. We call the CVS (Custom
Volume Size) and they can be as small as one CYL.

 

Note that with HDS the same size drive will have a different leftover amount
depending on the parity scheme selected (2D+2D, 4D+4D, 3D+P, 4D+P, or
6D+2P).

 

There may be some misunderstanding with your service provider as to the
common formatting sizes (3390-1/2/3/9) and using CVS. The HDS Parity Groups
should be formatted to the largest supported Volume size, and after
formatting completes you change them to whatever you need. 

 

For example, if you have parity group formatted as 3390-3, you can reformat
3 contiguous 3390-3 into 10x1000 CYL volumes plus one 17 CYL volume.

 

Ron

 

 


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