Zero Disk Space

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I have a Centos 7 server with ext4 running as a KVM and I want to zero the free disk space. This is so when I backup the KVM the compressed image size is reduced. I saw this command etc.



dd if=/dev/zero of=/zero bs=64k; sync; sync; sync; rm -f /zero


Is there anyway to make this stop when "/" root is 98 percent full?




linux ext4 dd disk




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  • 2




    Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
    – Ulrich Schwarz
    Jun 27 at 14:06










  • I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
    – Matt
    Jun 27 at 14:18










  • Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
    – Matt
    Jun 27 at 19:47














up vote
0
down vote

favorite
1












I have a Centos 7 server with ext4 running as a KVM and I want to zero the free disk space. This is so when I backup the KVM the compressed image size is reduced. I saw this command etc.



dd if=/dev/zero of=/zero bs=64k; sync; sync; sync; rm -f /zero


Is there anyway to make this stop when "/" root is 98 percent full?




linux ext4 dd disk




share|improve this question

















  • 2




    Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
    – Ulrich Schwarz
    Jun 27 at 14:06










  • I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
    – Matt
    Jun 27 at 14:18










  • Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
    – Matt
    Jun 27 at 19:47












up vote
0
down vote

favorite
1









up vote
0
down vote

favorite
1






1





I have a Centos 7 server with ext4 running as a KVM and I want to zero the free disk space. This is so when I backup the KVM the compressed image size is reduced. I saw this command etc.



dd if=/dev/zero of=/zero bs=64k; sync; sync; sync; rm -f /zero


Is there anyway to make this stop when "/" root is 98 percent full?




linux ext4 dd disk




share|improve this question













I have a Centos 7 server with ext4 running as a KVM and I want to zero the free disk space. This is so when I backup the KVM the compressed image size is reduced. I saw this command etc.



dd if=/dev/zero of=/zero bs=64k; sync; sync; sync; rm -f /zero


Is there anyway to make this stop when "/" root is 98 percent full?





linux ext4 dd disk





share|improve this question












share|improve this question




share|improve this question








edited Jun 27 at 14:09









Jeff Schaller

30.8k846104




30.8k846104









asked Jun 27 at 13:14









Matt

143




143







  • 2




    Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
    – Ulrich Schwarz
    Jun 27 at 14:06










  • I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
    – Matt
    Jun 27 at 14:18










  • Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
    – Matt
    Jun 27 at 19:47












  • 2




    Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
    – Ulrich Schwarz
    Jun 27 at 14:06










  • I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
    – Matt
    Jun 27 at 14:18










  • Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
    – Matt
    Jun 27 at 19:47







2




2




Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
– Ulrich Schwarz
Jun 27 at 14:06




Do you have reserved-for-root inodes/blocks set up for the device (often: 10%), and would you be happy if filled to 100%-10%=90%?
– Ulrich Schwarz
Jun 27 at 14:06












I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
– Matt
Jun 27 at 14:18




I am most concerned of the moment disk space is exhausted that some other processes will not be able to write to disk and crash etc.
– Matt
Jun 27 at 14:18












Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
– Matt
Jun 27 at 19:47




Looking at df -k and wanting to know how to get numerical value of percentage of /tmp used in bash script to compare too.
– Matt
Jun 27 at 19:47















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