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Shery
Asked: 2021-12-03 14:31:43 +0800 CST

Limiting ARC Size for the proposed system

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I have a pool of 5 x enterprise 12Gps SSD that I use for internal storage for a proxmox server. This pool is used to stand up VMs and containers. The problem is that it is eating up a lot of my available RAM which is 192G! Here is the summary: enter image description here

As you can see the Max size is 94.4GiB!!!

My question is: What should be the optimal value for this? and how to change it?

This is my production server and I want to be 100% sure of the process. (I already looked here but my server is also not honouring the arc size :( )

Any help or suggestions would be highly appreciated!

zfs zfsonlinux proxmox memory-usage

1 Answers

  1. You can persistently reduce the ARC size by doing the following.

    Edit or add a file named

    /etc/modprobe.d/zfs.conf

    Add a line as follows. This example line is for 1 gig of memory. So multiply the number by the number of gigs you want it to be sized.

    options zfs zfs_arc_max=1073741824

    After saving the file run the command

    update-initramfs -u -k all

    Then reboot to apply the changes.

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