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Operating Systems Linux Red Hat How to resize filesystem by resizing the LUN without impact to applications.? Post 302830011 by Just Ice on Sunday 7th of July 2013 09:33:34 PM
Old 07-07-2013
you can change the filesystem while it is running but you are asking for a disaster to happen ... essentially, you will be creating files and then messing up the filesystem underneath it ... it would be similar to jumping into a sand pit expecting a fairly solid spot but getting quick sand instead ...

i strongly advise against resizing filesystems while they are running or in use but if you really want to try it -- try testing the process you envision on a "disposable" server with LVM enabled and confirm if the risks involved are acceptable ...
 

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

NAME
quotaon, quotaoff -- turn filesystem quotas on and off SYNOPSIS
quotaon [-g] [-u] [-v] filesystem ... quotaon [-g] [-u] [-v] -a quotaoff [-g] [-u] [-v] filesystem ... quotaoff [-g] [-u] [-v] -a DESCRIPTION
quotaon announces to the system that disk quotas should be enabled on one or more filesystems. quotaoff announces to the system that the specified filesystems should have any disk quotas turned off. The filesystems specified must have entries in /etc/fstab and be mounted. quotaon expects each filesystem to have quota files named quota.user and quota.group which are located at the root of the associated file system. These defaults may be overridden in /etc/fstab. By default both user and group quotas are enabled. Available options: -a If the -a flag is supplied in place of any filesystem names, quotaon/quotaoff will enable/disable all the filesystems indicated in /etc/fstab to be read-write with disk quotas. By default only the types of quotas listed in /etc/fstab are enabled. -g Only group quotas listed in /etc/fstab should be enabled/disabled. -u Only user quotas listed in /etc/fstab should be enabled/disabled. -v Causes quotaon and quotaoff to print a message for each filesystem where quotas are turned on or off. Specifying both -g and -u is equivalent to the default. FILES
quota.user at the filesystem root with user quotas quota.group at the filesystem root with group quotas /etc/fstab filesystem table SEE ALSO
quota(1), libquota(3), fstab(5), edquota(8), quotacheck(8), repquota(8) HISTORY
The quotaon command appeared in 4.2BSD. BSD
December 11, 1993 BSD
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