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Filesystems, Disks and Memory
block size
Post 22075 by LivinFree on Tuesday 28th of May 2002 02:43:41 AM
05-28-2002
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When and where does the os block size get set?
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Following is one of the line from df -g command.
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If I execute this command:
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it returns the following value
57441881
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Hello,
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Accordingly a lot of manuals - if you have block size 8KB and trying to write a 1KB file to the block, as result you waste 7KB of the block space. But recently I noticed about Fragments of File Block. In same case if you have File Block 8KB and Fragment size 1KB - you can save your block space,... (6 Replies)
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LEARN ABOUT CENTOS
isosize
ISOSIZE(8) System Administration ISOSIZE(8) NAME
isosize - output the length of an iso9660 filesystem SYNOPSIS
isosize [options] iso9660_image_file DESCRIPTION
This command outputs the length of an iso9660 filesystem that is contained in the specified file. This file may be a normal file or a block device (e.g. /dev/hdd or /dev/sr0). In the absence of any options (and errors), it will output the size of the iso9660 filesystem in bytes. This can now be a large number (>> 4 GB). OPTIONS
-x, --sectors Show the block count and block size in human-readable form. The output uses the term "sectors" for "blocks". -d, --divisor number Only has an effect when -x is not given. The value shown (if no errors) is the iso9660 file size in bytes divided by number. So if number is the block size then the shown value will be the block count. The size of the file (or block device) holding an iso9660 filesystem can be marginally larger than the actual size of the iso9660 filesys- tem. One reason for this is that cd writers are allowed to add "run out" sectors at the end of an iso9660 image. AVAILABILITY
The isosize command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2011 ISOSIZE(8)