If you get the error "/dev/zero: No space left on device" in the apache error.log on a OpenVZ virtual machine, then the shared memory size in the xcache.ini is too high or the xcache.mm_path is set wrong.

Edit the file /etc/php5/conf.d/xcache.ini

vi /etc/php5/conf.d/xcache.ini

and check the mm_path. On a OpenVZ virtual machine it should be set to "/tmp/xcache" as /dev/zero might not work correctly in a virtual machine:

xcache.mmap_path = "/tmp/xcache"

Then restart apache2:

/etc/init.d/apache2 restart

and check if the error has been resolved.

If the roor still occurs after some time, you will have to reduce the xcache.size.

Edite the xcache.ini file:

vi /etc/php5/conf.d/xcache.ini

and set xcache.size to e.g. 8 MB

xcache.size  =                8M

Then restart apache2:

/etc/init.d/apache2 restart

How to solve the PHP XCache error: /dev/zero: No space left on device
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