Urgent: High cpu usage in Proxmox ve 4 with ZFS

[biifer]

I tried the tip of limiting the amount of zfs_acr_max memory.

lab:~$ cat /etc/modprobe.d/zfs.conf
options zfs zfs_arc_max=4299967296

I tried to run "update-initramfs -u" after the change but that didn't seem to make any difference. After a reboot though, the load dropped.



(Then there was a DNS issue, preventing the statistics form reaching the Nagios server, but that's another story...)

 

[Erk]

I tried the tip of limiting the amount of zfs_acr_max memory.



I tried to run "update-initramfs -u" after the change but that didn't seem to make any difference. After a reboot though, the load dropped.

View attachment 3123

(Then there was a DNS issue, preventing the statistics form reaching the Nagios server, but that's another story...)

update-initramfs -u doesn't do anything until you reboot after it, it's a modification to the boot ram disk.

 

[dragonslayr]

Ok, so this begs the question, I assume it's usually better to leave the default setting of 1/2 your ram rather than limit it like this. Is this not the general consensus?

 

[Erk]

Ok, so this begs the question, I assume it's usually better to leave the default setting of 1/2 your ram rather than limit it like this. Is this not the general consensus?

There is no real consensus, you have to examine what the ARC is using the RAM for an work out your settings based on that. This blog explains how http://www.cuddletech.com/blog/pivot/entry.php?id=979