Operatins System .ISO copied to RAM

[culdasergiu]

Hello everybody,

I have a cluster with three nodes, and it seems that on the first node, when I want to copy an iso image the RAM usage increase with the size of the .iso image.
Can anyone tell me from where this issue cames?
I want also to mention that on the other two nodes the issue doesn't appear.

 

[oguz]

hi,

* how are you copying the ISO image?

* where are you copying the ISO image?

EDIT:

* how much ram increase?

 

[culdasergiu]

I'm copy the image using WinSCP and the destination is on /tao-storagecluster (it's a zfs pool) folder

EDIT: If I copy an .iso image with 8gb size, the memory ram increase with 8GB (so the ram increase with the size of the copied file), if i delete the .iso image the memory decrease

 

[oguz]

If I copy an .iso image with 8gb size, the memory ram increase with 8GB (so the ram increase with the size of the copied file), if i delete the .iso image the memory decrease

is memory freed again when the copy operation is completed?

 

[culdasergiu]

is memory freed again when the copy operation is completed?

Unfortunately not, just if i reboot the node. or if i run : echo 3 > /proc/sys/vm/drop_caches

 

[culdasergiu]

Does anyone have an idea what can I do?

 

[sg90]

It will be ZFS caching the file : https://www.zfsbuild.com/2010/04/15/explanation-of-arc-and-l2arc/

When the Ram is requested for something else the cache memory should be returned, however you can tune how much ZFS will use for ARC within the RAM.

 

[culdasergiu]

It will be ZFS caching the file : https://www.zfsbuild.com/2010/04/15/explanation-of-arc-and-l2arc/

When the Ram is requested for something else the cache memory should be returned, however you can tune how much ZFS will use for ARC within the RAM.

Thanks for reply sg90.
Do you have an idea how to properly set the memory cache size?

 

[t.lamprecht]

Do you have an idea how to properly set the memory cache size?

https://pve.proxmox.com/wiki/ZFS_on_Linux#_limit_zfs_memory_usage