backup slow

[jjiyuie]

I have a proxmoxback server,

node is zfs,has a vm 500g hardisk,

wehen backup , it's read all data,from 0 to 500g,not use any zfs snapshot function????

take too long time?

any help?

 

[jjiyuie]

may I need chang vm hardisk storage config?

 

[UdoB]

wehen backup , it's read all data,from 0 to 500g

Only if this VM has been rebootet since the last backup: yes. It needs to read all the data blocks to check if one is different from the backuped version.

If the VM was continuously running since the last update it knows already which blocks are changed and only these have to be read from source and be transferred to the PBS. (Using "dirty bitmaps".)

not use any zfs snapshot function????

Correct. The integrated backup functionality is independent of the underlying filesystem/block device for the virtual disks. (It uses the Qemu-integated snapshot capabilities to get a consistent state.)

 

[jjiyuie]

Only if this VM has been rebootet since the last backup: yes. It needs to read all the data blocks to check if one is different from the backuped version.

If the VM was continuously running since the last update it knows already which blocks are changed and only these have to be read from source and be transferred to the PBS. (Using "dirty bitmaps".)


Correct. The integrated backup functionality is independent of the underlying filesystem/block device for the virtual disks. (It uses the Qemu-integated snapshot capabilities to get a consistent state.)

thanks, I Hope it can use zfs snap fucntions. I hava many vm, they just run for a few hours,evey day.