Proxmox Showing RAM Usage High

[sujan-inspheris]

Hello, I have setup a new proxmox of a latest version 7.4-3 and migrated the VM from the older proxmox in which the RAM USage was showing perfectly fine of about 40 GB but after migrating the same VM to a new one it is showing the high RAM usage. Please help me to solve the problem how that can be minimized so that i can use all the rescources.I have attached the screenshot from both terminal and console of details to show the RAM usage.

Thanks

 

[Neobin]

Please provide the full output from the PVE-host in code-tags each of:

• arc_summary -s arc
• free -h

 

[pille99]

i have noticed the same, just for single VMs. the VM 1GB use, in the Summary of the VM shows 10GB use.

 

[sujan-inspheris]

Please provide the full output from the PVE-host in code-tags each of:

• arc_summary -s arc
• free -hT

The output is:

ZFS Subsystem Report                            Wed Apr 19 09:06:04 2023
Linux 5.15.104-1-pve                                          2.1.9-pve1
Machine: sd-176475 (x86_64)                                   2.1.9-pve1

ARC status:                                                      HEALTHY
        Memory throttle count:                                         0

ARC size (current):                                   100.1 %   94.5 GiB
        Target size (adaptive):                       100.0 %   94.4 GiB
        Min size (hard limit):                          6.2 %    5.9 GiB
        Max size (high water):                           16:1   94.4 GiB
        Most Frequently Used (MFU) cache size:         47.5 %   42.8 GiB
        Most Recently Used (MRU) cache size:           52.5 %   47.3 GiB
        Metadata cache size (hard limit):              75.0 %   70.8 GiB
        Metadata cache size (current):                  7.5 %    5.3 GiB
        Dnode cache size (hard limit):                 10.0 %    7.1 GiB
        Dnode cache size (current):                   < 0.1 %    1.5 MiB

ARC hash breakdown:
        Elements max:                                              14.5M
        Elements current:                             100.0 %      14.5M
        Collisions:                                                 3.8M
        Chain max:                                                     7
        Chains:                                                     2.4M

ARC misc:
        Deleted:                                                      15
        Mutex misses:                                                544
        Eviction skips:                                                9
        Eviction skips due to L2 writes:                               0
        L2 cached evictions:                                     0 Bytes
        L2 eligible evictions:                                  28.4 GiB
        L2 eligible MFU evictions:                      6.1 %    1.7 GiB
        L2 eligible MRU evictions:                     93.9 %   26.7 GiB
        L2 ineligible evictions:                                 2.8 Gi

and output of free -h:

               total        used        free      shared  buff/cache   available
Mem:           188Gi       141Gi        17Gi        54Mi        29Gi        45Gi
Swap:          8.8Gi          0B       8.8Gi

 

[Chris]

Hi,
please note that ZFS can use up to 50% of memory for ARC by default. Please consult our docs [0] (especially section 3.8.8) regarding ZFS and how to limit ARC usage.

[0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_zfs

 

[killmasta93]

to limit the arc,

nano /etc/modprobe.d/zfs.conf

# Min 2048MB / Max 4096 MB Limit with 32 gigs of ram
options zfs zfs_arc_min=2147483648
options zfs zfs_arc_max=4294967296

then update-initramfs -u

and reboot

 

[sujan-inspheris]

The summary of RAM Usage is as per the use now. Thank you all for the help.