Thank for you answer! Yes, i use ZFS. Can I fix it somehow? And is it nesesary?
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It is cache. So if you don't need the RAM, using it to cache read operations is a good use of that RAM. Reading from RAM is a LOT quicker than reading data from disk. If you have or set up some external performance monitoring you can also monitor the size and the hit rate of the ARC.
On my personal servers I get a hit ratio of over 99% during normal operations. It drops during backups or when installing software/updates in my VMs.
The first time you ran ARC (in the screenshot) you can see that 77 read operations were done and only 1 was missed and needed access to the disk.
By default, ZFS will use up to 50% of the installed RAM (if needed and available). It will release RAM if other processes need it. If you run into problems because ZFS is not releasing the RAM fast enough, you can limit the ARC size. But don't make it too small as it will reduce the read performance if the data must be read from disk instead of RAM.
On my personal servers I get a hit ratio of over 99% during normal operations. It drops during backups or when installing software/updates in my VMs.
The first time you ran ARC (in the screenshot) you can see that 77 read operations were done and only 1 was missed and needed access to the disk.
By default, ZFS will use up to 50% of the installed RAM (if needed and available). It will release RAM if other processes need it. If you run into problems because ZFS is not releasing the RAM fast enough, you can limit the ARC size. But don't make it too small as it will reduce the read performance if the data must be read from disk instead of RAM.
