How can I find the filesystem block size?

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dumpe2fs

DUMPE2FS(8)						      System Manager's Manual						       DUMPE2FS(8)

NAME

       dumpe2fs - dump filesystem information

SYNOPSIS

       dumpe2fs [ -bfhixV ] [ -ob superblock ] [ -oB blocksize ] device

DESCRIPTION

       dumpe2fs prints the super block and blocks group information for the filesystem present on device.

       dumpe2fs is similar to Berkeley's dumpfs program for the BSD Fast File System.

OPTIONS

       -b     print the blocks which are reserved as bad in the filesystem.

       -ob superblock
	      use  the	block  superblock  when  examining the filesystem.  This option is not usually needed except by a filesystem wizard who is
	      examining the remains of a very badly corupted filesystem.

       -oB blocksize
	      use blocks of blocksize bytes when examining the filesystem.  This option is not usually needed except by a filesystem wizard who is
	      examining the remains of a very badly corupted filesystem.

       -f     force  dumpe2fs to display a filesystem even though it may have some filesystem feature flags which dumpe2fs may not understand (and
	      which can cause some of dumpe2fs's display to be suspect).

       -h     only display the superblock information and not any of the block group descriptor detail information.

       -i     display the filesystem data from an image file created by e2image, using device as the pathname to the image file.

       -x     print the detailed group information block numbers in hexadecimal format

       -V     print the version number of dumpe2fs and exit.

BUGS

       You need to know the physical filesystem structure to understand the output.

AUTHOR

       dumpe2fs was written by Remy Card <Remy.Card@linux.org>.

AVAILABILITY

       dumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.

SEE ALSO

       e2fsck(8), mke2fs(8), tune2fs(8)

E2fsprogs version 1.32						   November 2002						       DUMPE2FS(8)

AIX