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Im a very new admin(intern) without anyone to show me the job. The company i work for use rsnaphot to do their backups. Here's their filesystem (CentOs) :

Filesystem Size Used Avail Use% Mounted on /dev/sda3 184G 140G 35G 81% / tmpfs 2.3G 0 2.3G 0% /lib/init/rw udev 2.3G 212K 2.3G 1% /dev tmpfs 2.3G 0 2.3G 0% /dev/shm /dev/sda1 4.6G 156M 4.2G 4% /boot /dev/sda4 33G 176M 31G 1% /tmp /dev/sdb1 1.8T 1.8T 0 100% /media/backupInterne /dev/sdd1 917G 470G 401G 54% /media/Data

The sdb1 disk is used to do a backup of sdd1 disk. The rsnapshot schedule is like that :

hourly : 24 daily : 30 weekly : 4 monthly :12

When i saw the full disk, i went to see if any errors were appearing in the logs, but nothing. In fact, every cron job is happening as if nothing was wrong. How is that even possible?

Thank you

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1 Answer 1

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I can think of two possibilities here.

  1. Linux filesystems with their default configuration have a certain percentage (5% I believe) of space "reserved" for the root user. If rsnapshot is being run as root, it actually has more space available than tools will report.
  2. If there are not many changes happening, the vast majority of rsnapshot's work is accomplished using links, which don't take up disk space.
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  • Thanks! Found out how much real space was left (yikes!) and my boss just calm down a little :) Commented Dec 6, 2013 at 19:40
  • @littleadmin - You're welcome! So it was #1 that applied to your circumstance, correct? Commented Dec 6, 2013 at 19:41
  • Yes, i totally forgot about that reserved space. Thanks again Commented Dec 6, 2013 at 19:44
  • @littleadmin - You're welcome! Glad I could help. Commented Dec 6, 2013 at 20:03

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