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Special Forums Hardware Filesystems, Disks and Memory Does unix ever misreport free space? Post 54427 by zazzybob on Friday 13th of August 2004 04:25:59 AM
Old 08-13-2004
Hmm.... Could there be disk quotas in place on your system? Try repquota -v filesystem where filesystem should be replaced (obviously) with something like /tmp. repquota -av will report on all filesystems. To check your own quota, run "quota -v".

I doubt if it's this, but I know that there is a "minfree" value associated with certain UNIX filesystems (which OS are you using?).

This value is normally set to 10% (at least it is under HP-UX), and this space will not be available for use by users. It can be adjusted with tunefs. Lowering the value can reclaim space, but at the con of lowering throughput on the device.

You can check the current setting with "tunefs -v /dev/vg01/lvol1" where /dev/vg01/lvol1 should be replaced with whatever device you're checking.

On our system, we sometimes reduce minfree to 5% when we are backing up our databases, and then increase back to it 10% once the data has been archived off the disk.
 

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REPQUOTA(8)						    BSD System Manager's Manual 					       REPQUOTA(8)

NAME
repquota -- summarize quotas for a file system SYNOPSIS
repquota [-g] [-u] [-v] filesystem ... repquota [-g] [-u] [-v] -a DESCRIPTION
Repquota prints a summary of the disk usage and quotas for the specified file systems. Available options: -a Print the quotas of all the filesystems configured with a quota mount option file at its root. -g Print only group quotas (the default is to print both group and user quotas if they exist). -u Print only user quotas (the default is to print both group and user quotas if they exist). -v Print a header line before printing each filesystem quotas. For each user or group, the current number of files and amount of space (in kilobytes) is printed, along with any quotas created with edquota(8). Only members of the operator group or the super-user may use this command. FILES
Each of the following quota files is located at the root of the mounted filesystem. The mount option files are empty files whose existence indicates that quotas are to be enabled for that filesystem. .quota.user data file containing user quotas .quota.group data file containing group quotas .quota.ops.user mount option file used to enable user quotas .quota.ops.group mount option file used to enable group quotas SEE ALSO
quota(1), quotactl(2), edquota(8), quotacheck(8), quotaon(8) DIAGNOSTICS
Various messages about inaccessible files; self-explanatory. HISTORY
The repquota command appeared in 4.2BSD. 4.2 Berkeley Distribution March 28, 2002 4.2 Berkeley Distribution
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