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Top Forums UNIX for Advanced & Expert Users Physical disk IO size smaller than fragment block filesystem size ? Post 302768839 by jim mcnamara on Saturday 9th of February 2013 08:43:26 PM
Old 02-09-2013
Suppose you open a file and write one byte to the file. You close the file. close() is required to update filesystem metadata, and sync the data in the file.

open() already allocated the minimum number of blocks specified as a filesystem parameter for minimum blocks per file/inode.

Those i/o's are very likely metadata (inode and directory) updates. What else is there left to do?
 

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

NAME
dumpe2fs - dump ext2/ext3/ext4 filesystem information SYNOPSIS
dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device DESCRIPTION
dumpe2fs prints the super block and blocks group information for the filesystem present on device. Note: When used with a mounted filesystem, the printed information may be old or inconsistent. OPTIONS
-b print the blocks which are reserved as bad in the filesystem. -o superblock=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 corrupted filesystem. -o blocksize=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 corrupted 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). -g display the group descriptor information in a machine readable colon-separated value format. The fields displayed are the group number; the number of the first block in the group; the superblock location (or -1 if not present); the range of blocks used by the group descriptors (or -1 if not present); the block bitmap location; the inode bitmap location; and the range of blocks used by the inode table. -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>. It is currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>. AVAILABILITY
dumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net. SEE ALSO
e2fsck(8), mke2fs(8), tune2fs(8). ext4(5) E2fsprogs version 1.44.1 March 2018 DUMPE2FS(8)
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