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Old 10-12-2014, 09:09 AM   #1
stf92
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Size of a block in ext2?


Hi: I formatted a partition with 'mke2fs -c -v -L<label>', and I did not take notice of the output messages. What can the block size be resulting from that command?
 
Old 10-12-2014, 09:25 AM   #2
jamesf
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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
 
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Old 10-12-2014, 09:30 AM   #3
stf92
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I also got 'Block size: 4096'. Thank you. Has the fs to be unmounted before running tune2fs -l?
 
Old 10-12-2014, 09:47 AM   #4
jamesf
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For -l, no.
 
2 members found this post helpful.
Old 10-12-2014, 10:03 AM   #5
stf92
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Thanks again.
 
  


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