http://go7cnxivpns4x2trczyaabxwnrz7bwlxjiverkc32o4mjd5npjukpqid.onion/blog/2024-02-22-shrinking-xfs-partition-on-lvm.html
The size of whole XFS partition is data blocks count (1460908544) * block size (4096).
The log is internal, so it resides in the data section. XFS partition is internally split into allocation groups ("AG" in short). Now you may guess what agcount= and agsize= mean. This is what df says about it: raspberrypi3:~ # df -B 4K /mnt/data
Filesystem 4K-blocks Used Available Use% Mounted on
/dev/mapper/icy_box-data 1460386816 286650528 1173736288 20% /mnt/data Number of data...