Open File Limits¶
When using MAGS with a remote linux system, you always have to keep in mind that there are defined present limits for simultaneous open files. In some environments, when having a large number of parallel backup jobs started by a MAGS instance, these limits can be reached, which will lead to performance degradation.
System settings¶
Here are examples on how to check the current system configuration and how to change it, if needed:
[root@linuxhost ~]# cat /proc/sys/fs/file-max
104733000
or…
[root@linuxhost ~]# sysctl -a|grep fs.file-max
fs.file-max = 104733000
Setting a new value:
sysctl -w fs.file-max=999500
This will only persist until the next reboot. To set it permanently:
vi /etc/sysctl.conf
Add the following line at the end:
fs.file-max=999500
Then, either log out and in again or issue sysctl -p
to change the current settings.
User settings¶
To check the user file limit settings, issue:
[root@linuxhost ~]# cat /etc/security/limits.conf
root soft nofile 999500
root hard nofile 999500
mags soft nofile 999500
mags hard nofile 999500
Or for a specific user:
[root@linuxhost ~]# ulimit -n
999500
[root@linuxhost ~]# su - mags
Last login: Tue Jan 25 10:14:26 CET 2022 on pts/6
[mags@linuxhost ~]$ ulimit -n
999500
These can then be edited by issuing:
vi etc/security/limits.conf
Then, log out and in again.