zfs "arc_summary" command missing?

[JakeFrosty]

It seems in my Proxmox-VE ZFS/EFI installation the arc_summary command is missing, is this the result of an update?

Here's my package list

proxmox-ve: 9.1.0 (running kernel: 6.17.4-2-pve)
pve-manager: 9.1.6 (running version: 9.1.6/71482d1833ded40a)
proxmox-kernel-helper: 9.0.4
proxmox-kernel-6.17: 6.17.13-2
proxmox-kernel-6.17.13-2-pve-signed: 6.17.13-2
proxmox-kernel-6.17.13-1-pve-signed: 6.17.13-1
proxmox-kernel-6.17.9-1-pve-signed: 6.17.9-1
proxmox-kernel-6.17.4-2-pve-signed: 6.17.4-2
proxmox-kernel-6.14: 6.14.11-6
proxmox-kernel-6.14.11-6-pve-signed: 6.14.11-6
proxmox-kernel-6.14.11-5-pve-signed: 6.14.11-5
proxmox-kernel-6.14.11-4-pve-signed: 6.14.11-4
proxmox-kernel-6.14.11-3-pve-signed: 6.14.11-3
proxmox-kernel-6.14.11-1-pve-signed: 6.14.11-1
proxmox-kernel-6.14.8-2-pve-signed: 6.14.8-2
amd64-microcode: 3.20251202.1~bpo13+1
ceph-fuse: 19.2.3-pve1
corosync: 3.1.10-pve1
criu: 4.1.1-1
dnsmasq: 2.91-1
frr-pythontools: 10.4.1-1+pve1
ifupdown2: 3.3.0-1+pmx12
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-5
libproxmox-acme-perl: 1.7.0
libproxmox-backup-qemu0: 2.0.2
libproxmox-rs-perl: 0.4.1
libpve-access-control: 9.0.5
libpve-apiclient-perl: 3.4.2
libpve-cluster-api-perl: 9.1.1
libpve-cluster-perl: 9.1.1
libpve-common-perl: 9.1.8
libpve-guest-common-perl: 6.0.2
libpve-http-server-perl: 6.0.5
libpve-network-perl: 1.2.5
libpve-rs-perl: 0.11.4
libpve-storage-perl: 9.1.0
libspice-server1: 0.15.2-1+b1
lvm2: 2.03.31-2+pmx1
lxc-pve: 6.0.5-4
lxcfs: 6.0.4-pve1
novnc-pve: 1.6.0-3
proxmox-backup-client: 4.1.4-1
proxmox-backup-file-restore: 4.1.4-1
proxmox-backup-restore-image: 1.0.0
proxmox-firewall: 1.2.1
proxmox-kernel-helper: 9.0.4
proxmox-mail-forward: 1.0.2
proxmox-mini-journalreader: 1.6
proxmox-offline-mirror-helper: 0.7.3
proxmox-widget-toolkit: 5.1.8
pve-cluster: 9.1.1
pve-container: 6.1.2
pve-docs: 9.1.2
pve-edk2-firmware: 4.2025.05-2
pve-esxi-import-tools: 1.0.1
pve-firewall: 6.0.4
pve-firmware: 3.18-1
pve-ha-manager: 5.1.1
pve-i18n: 3.6.6
pve-qemu-kvm: 10.1.2-7
pve-xtermjs: 5.5.0-3
qemu-server: 9.1.4
smartmontools: 7.4-pve1
spiceterm: 3.4.1
swtpm: 0.8.0+pve3
vncterm: 1.9.1
zfsutils-linux: 2.4.0-pve1

any ideas why it may have disappeared? any alternative to check arc stats other than the webui?

 

[cheiss]

arc_summary is part of the zfsutils-linux package, which seems to be correctly installed.

What error do you get exactly when trying to run it?

 

[Onslow]

is this the result of an update?

Yes.
Now arc_summary is named zarcsummary .
And, BTW, arcstat is renamed zarcstat .

The details end explanation:

O

[SOLVED] Post in thread 'No zfstools in the latest kernel 6.17.9-1-pve'

Feb 5, 2026

At https://packages.debian.org/forky/amd64/zfsutils-linux/filelist I can see there are /usr/bin/zarcstat and /usr/bin/zarcsummary

Maybe those were renamed in the newer version?
What about man zarcstat ?

P.S.
Indeed.

https://metadata.ftp-master.debian.org/changelogs//contrib/z/zfs-linux/zfs-linux_2.4.0-1_changelog

zfs-linux (2.4.0-1~exp1) experimental; urgency=medium

* New upstream version 2.4.0.
...
* Rename arcstat and arc_summary to zarcstat and zarcsummary.
- no longer conflicts with nordugrid-arc-client (closes: #1063457).
-...

• Onslow

•