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48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
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---
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layout: doc
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title: Out of Memory
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permalink: /doc/out-of-memory/
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redirect_from:
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- /en/doc/out-of-memory/
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- /doc/OutOfmemory/
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- /wiki/OutOfmemory/
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---
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VMs (especially templates) use pre-allocated space. The default private storage max size is 2 GB, but it's very easy to increase as needed. If the disk is completely full, you will get an `Out of disk space` error that may crash your system because Dom0 does not have enough disk space to work. So it's good practice to regularly check disk space usage with the command `df -h` in dom0 terminal.
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A system that's out of space should be able to boot, but may be unable to load a desktop manager. In this case it is possible to login to dom0 terminal with Alt + Ctrl + F2. To recover disk space it may be possible to delete files in a userVM by connecting to the userVM terminal:
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~~~
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qvm-start <VMname>
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sudo xl console <VMname>
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~~~
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If this does not work, check the size of /var/lib/qubes/qubes.xml. If it is zero, you'll need to use one of the file backup (stored in /var/lib/qubes/backup), hopefully you have the current data there. Find the most recent one and place in /var/lib/qubes/qubes.xml instead of the empty file.
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In any case you'll need some disk space to start the VM. Check `df -h` output if you have some. If not, some hints how to free some disk space:
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1. Clean yum cache:
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~~~
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sudo yum clean all
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~~~
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1. Delete .img files of a less important VM, that can be found in
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/var/lib/qubes/appvms/. Then, when the system is working again, cleanup the rest with:
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~~~
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qvm-remove <VMname>
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~~~
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With this method you lose the data of one VM, but it'll work more reliably.
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1. Decrease filesystem safety margin (5% by default):
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~~~
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sudo tune2fs -m 4 /dev/mapper/vg_dom0-lv_root
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~~~
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1. Remove some unneeded files in dom0 home (if you have any, most likely not).
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