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Full Discussion: du and dfspace reporting
Operating Systems SCO du and dfspace reporting Post 302699851 by hicksd8 on Wednesday 12th of September 2012 11:51:04 AM
Old 09-12-2012
@jlliagre......thanks for the help here.

My understanding is (correct me if I'm wrong) that df (what we all look at as sysadmins to see how full filesystems are) regards all disk sectors (blocks) allocated as unavailable (which they are).

One file may contain, say, 4 bytes, but occupy the minimum 512 bytes (1 block), therefore the discrepancy can be huge if there are a lot of small files. The larger the files (eg. big Oracle dB) will mean occupied blocks and actual file bytes used look closer.

The df tells you filesystem occupied blocks but du is basically adding up file sizes which will be different.

Anyone disagree with that? Useful discussion this!!
 

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quot_vxfs(1M)															     quot_vxfs(1M)

NAME
quot_vxfs: quot - summarize ownership on a VxFS file system SYNOPSIS
filesystem ... DESCRIPTION
displays the number of 1024-byte blocks in the specified VxFS filesystem that are currently owned by each user. filesystem is either the name of the directory on which the file system is mounted or the name of the device containing the file system. Options recognizes the following options: Specifies file system type. Generate a report for all mounted file systems. Report file system size instead of user statistics. The option generates histogram statistics in 3-column format: Column 1: File size in blocks. Sizes are listed in ascending order up to 499 blocks per file. Files occupying 499 or more blocks are counted together on a single line as 499-block files, but column 3 is based on actual number of blocks occupied. Column 2: Number of files of size indicated in column 1. Column 3: Cumulative total blocks occupied by files counted in current plus all preceding lines. The option overrides the and options. Display the number of files and space occupied by each user. Calculate the number of blocks in the file based on file size rather than actual blocks allocated. The option does not account for sparse files (files with holes in them). Accept ncheck(1M) data as input. The following pipeline will produce a list of all files and their owners: Display three columns containing the number of blocks not accessed in the last 30, 60, and 90 days. Validate the command line options, but do not execute the command. If the options specified are valid, echoes the complete command line. If the options specified are not valid, it prints an error message. Operands recognizes the following operand: filesystem Name of the directory on which the VxFS file system is mounted or the name of the device containing the file system.. EXAMPLES
The following examples show the output of using various options. AUTHOR
Disk Quotas were developed by the University of California, Berkeley, Sun Microsystems, Inc., and HP. FILES
Mounted file system table Password file (contains user names). SEE ALSO
du(1), find(1), ls(1), fstyp(1M), mount(1M), ncheck(1M), quot(1M), repquota(1M), quota(5). quot_vxfs(1M)
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