grepusr3
New User
Joined: 10 May 2005 Posts: 29
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Maximum allocated blocksize depends on your DASD devices, disk geometry and your record length. The allocation is based on CKD devices. Most modern DASD (Fixed Block Architecture) emulates CKD models. For optimum allocation, try coding BLKSIZE=0 in the DCB when creating your dataset (the system will define the block size for you).
Using BLKSIZE=32760 on a 3390-3 DASD may create a mucho wasted space, since it is not a whole multiple of track size. Try to allocate block size that is when multiplied (factored), it is as close to the Track Size (56,664) as possible.
For BLKZISE=32760, unallocated space per track = (56,664 - 32,760) = 23,904 bytes
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3390 DASD/Disk Information
DASD Model____________ |__3390-2 |____3390-3 |____3390-9 |____3390-27
Track Size in Bytes___ |__56,664 |____56,664 |____56,664 |_____56,664
Tracks per Cylinder___ |______15 |________15 |________15 |_________15
Tracks per Volume_____ |__33,390 |____50,085 |___150,255 |____450,765
Cylinders per Volume__ |___2,226 |_____3,339 |____10,017 |_____30,051
Bytes per Cylinder____ |_849,960 |___849,960 |___849,960 |____849,960
Bytes per Volume______ |_1.89_GB |___2.84_GB |___8.51_GB |___25.53_GB
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-Pelad |
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