File System size vs VSAM LDS allocation size

There is a difference between file system size (df command, zfsadm aggrinfo command output) vs VSAM LDS allocation size (LISTCAT command output).

Understanding Allocation size and file system size

Log file
Records metadata changes. By default, its size is 1% of the disk size. However, it will never be smaller than 14 blocks and it will never be larger than 16,384 blocks (128 MB).
Bitmap
Lists the blocks that are free on disk. The file size depends on the size of the aggregate.
Aggregate File System List
Describes the file systems that are contained in the aggregate. For compatibility mode aggregates it is usually only one 8-KB block.
8K Blocks
zFS File System allocation is based on 8K blocks, therefore z/OS zFS is able to allocate 6 blocks in 1 track, it means that 90 8 Blocks in 1 cylinder.
Convert to track count to bytes
49152 Bytes in 1 track
6* 8192 < 56664 < 7 * 8192 <--- Unable to allocate 7 or more 8KBloks in 1 track.
So 15 tracks in 1 clylinder so allocate 90 8Kblocks per 1 cylinder.
We can convert from tracks or cylinders to bytes:

90 * 8 Kblocks /cilinder = 90 * 8192 bytes = 737280 Bytes = 720 KB / cilinder => 720KB / Clylinder
6 * 8 KBlocks / track = 6 * 8192 bytes = 49152 Bytes = 48 KB / track          =>  48KB / track

cf) Normal dataset allocation
56664 Bytes in 1 track
56664 * 15 = 849960 = 830.0390625 = about 830KB / Cylinder

File system size vs VSAM size
49152 : 56664 --> 56664 / 49152 = 1.15283203125, VSAM allocation size is about 15% greater than file system size.

References

zfsadm fsinfo
https://www.ibm.com/docs/en/zos/2.4.0?topic=commands-zfsadm-fsinfo
zfsadm aggrinfo
https://www.ibm.com/docs/en/zos/2.4.0?topic=scd-df-display-amount-free-space-in-file-system
df
https://www.ibm.com/docs/en/zos/2.4.0?topic=scd-df-display-amount-free-space-in-file-system
LISTCAT
https://www.ibm.com/docs/en/zos/2.4.0?topic=subcommands-listcat-command
HI-U-RBA is almost file system size, you can confirm HI-U-RBA / 8192 converting to 8K blocks.
https://www.ibm.com/docs/en/zos/2.4.0?topic=aggregates-dynamically-growing-compatibility-mode-aggregate