Limit in FBA volume sizes

[sdl-hercules-390]

Limit in FBA volume sizes

[Fish-Git]

The supported FBA dasd device types and their corresponding sizes are:

                            FBA DEVICES

            BYTES/  BLOCKS/  BLOCKS/   BLOCKS/    BYTES/
DISK TYPE   BLOCK   TRACK    CYLINDER  ACTUATOR   ACTUATOR

3310         512      32       352     125,664    64,339,968
3370-Al/B1   512      62       744     558,000   285,696,000
3370-A2/B2   512      62       744     712,752   364,929,024
9313-1/14    512      96       480     246,240   126,074,880
9332-200     512      73       292     360,036   184,338,432
9332-400     512      73       292     360,036   184,338,432
9332-600     512      73       292     554,800   284,057,600
9335         512      71       426     804,714   412,013,568
9336-10      512      63       315     920,115   471,098,880
9336-20/25   512     111       777   1,672,881   856,515,072
0671         512      63       504     574,560   294,174,720
0671-04      512      63       504     624,456   319,721,472
0671-08      512      63       504     513,072   262,692,864

As you can see none of the supported FBA dasd device types support any size larger than 865MB, nor am I aware of any FBA device type that supports a 3GB device size.

[hugolia]

If you specify the number of blocks in the dasdinit program you can create volumes with larger sizes. You can for example create CKD volumes larger than 3390-9 by simply specifying the number of cylinders. Those bigger volumes can be attached and are managed fine with Hercules.

I am running Hercules with z/VM 6.3 (for educational purposes) and am using 30GB CKD volumes without problem.

I've found a workaround by using volumes created with 20,971,584 blocks, which is a little more than 10GB: see: https://groups.yahoo.com/neo/groups/H390-VM/conversations/topics/12704 (note: sign in to Yahoo required).