High memory usage

D

da-alb

Active Member
Jan 18, 2021
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Hi,

I have a host with roughly 90 LXCs and 50 KVMs running. I've calculated the total usage and roughly it's something around 100 GiB, the host has 384 GiB of total ram installed.

I'm having some difficulties on understanding what's happening. After host reboot the total usage seems to be around 100 GiB. I suspect using PBS as a backup method as something to do this issue.

1641229268968.png

Any ideas?

Thanks
 
birdy said:
Only one way to find out:

arc_summary
Click to expand...
Thanks for pointing that out. I totaly forgot about it. Arc size (current) is using half of the total ram. I'm going to reconfigure it, I have a very small pool in mirror mode.

Thanks
 
LnxBil said:
Some of you LX(C) containers use swap instead of RAM, so give them more RAM. Your system is unnecessarily slow because of this. You have ~60 GB free but all swap used? That is a configuration error and has nothing to do with ZFS.
Click to expand...
The containers are not swapping, they have more than enough ram, in fact they are only using 400 MBs each and they have 1 or 2 GB each...
 
But your SWAP is at 100% usage (8191 of 8191 MB) so something is swapping while you still got 61GB RAM available.
You could try to lower the swappiness down to 1, so it is really only used to prevent the OOM killer from triggering.
 
Last edited:
Dunuin said:
But your SWAP is at 100% usage (8191 of 8191 MB) so something is swapping while you still got 61GB RAM available.
You could try to lower the swappiness down to 1, so it is really only used to prevent the OOM killer from triggering.
Click to expand...
I'll try
 
Lowering the arc size cache to a limit of 8 GB the ram usage is now normal. Thank you all
 
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