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How do I determine the block size of an ext3 partition on Linux?

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6 Answers 6

up vote 30 down vote accepted
# tune2fs -l /dev/sda1 | grep -i 'block size'
Block size:               1024

Replace /dev/sda1 with the partition you want to check.

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On x86, a filesystem block is just about always 4KiB - the default size - and never larger than the size of a memory page (which is 4KiB).

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This is the same on every platform, the largest block size is supported by ext2/3 is 4096 bytes. –  Dave Cheney Jun 23 '09 at 10:06
    
Thanks Dave! I learned something today ;-) I originally thought the ext3 blocksize could be 8k on platforms that supported 8k memory pages. –  wzzrd Jun 23 '09 at 12:44
    
Wikipedia says it can be 8k: en.wikipedia.org/wiki/Ext3#Size_limits –  dfrankow Apr 25 '12 at 22:41
    
@dfrankow: if you have 8k memory pages, such as on Alpha hardware, yes. But you do not have those on x86 hardware and that is what I was talking about. –  wzzrd Apr 26 '12 at 8:03
dumpe2fs -h /dev/md2

will output something with:

Block size:               4096
Fragment size:            4096
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dumpe2fs |grep Block

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fdisk will give you this information.

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fdisk does not show the size of a filesystem block. A sector yes, a cylinder yes, but not blocks. –  wzzrd Jun 23 '09 at 6:43

df -h

du-h

fdisk

above 3 command will give size of block in all most all the distro..

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4  
No, they don't. df shows free disk space, du shows disk usage and fdisk show partition information. Neither show the size of a filesystem block. –  wzzrd Jun 23 '09 at 6:41

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