Try this command:
Code:
tune2fs -l /dev/XXX
where X is the device and partition number of the partition you're interested in. The block size is listed about halfway down, under 'Block size'.For me, for my root device, it says:
Code:
root@gaz:~# tune2fs -l /dev/sda5
tune2fs 1.42.8 (20-Jun-2013)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 4a251bed-74b5-4aa9-8e65-f1e80650ec08
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 915712
Block count: 3662812
Reserved block count: 183140
Free blocks: 775120
Free inodes: 459727
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 894
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8176
Inode blocks per group: 511
Filesystem created: Sat Jun 11 04:14:51 2011
Last mount time: Tue Oct 7 17:25:33 2014
Last write time: Thu Sep 18 16:51:51 2014
Mount count: 16
Maximum mount count: 21
Last checked: Thu Sep 18 16:51:51 2014
Check interval: 15552000 (6 months)
Next check after: Tue Mar 17 16:51:51 2015
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 20917
Default directory hash: half_md4
Directory Hash Seed: cdcc8d4a-6255-4d4a-8ff9-64fd61e47deb
Journal backup: inode blocks
