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cPanel's minimal tmp setup is horrific at best. With stuff climbing up there constantly, it should be increased from 512mb to at least a 2-3 gig partition. Here's how to do this:
Step 1: Remove the old tmp space
service httpd stop
service mysql stop
rm -rf /usr/tmpDSK
Step 2, edit the script used to create tmp space
nano /scripts/securetmp
In there, look for
my $tmpdsksize = 512000; # Must be larger than 250000
and replace it with
my $tmpdsksize = 3072000; # Must be larger than 250000
Save (ctrl-X , then y when asked), and reboot the server
shutdown -r now
The system will adjust temp sizes when it comes back up.
For whatever reason, unmounting tmp is close to impossible, even if mysql and http aren't running. Your best bet is to follow the above (which I've done many times and never had a problem with)
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