backup: Warning: Cannot fgetxattr: Operation not supported

[MSerg]

Hi.
I got a lot of that strings:
...
INFO: tar: root: Warning: Cannot fgetxattr: Operation not supported
INFO: tar: .razor: Warning: Cannot fgetxattr: Operation not supported
INFO: tar: .w3m: Warning: Cannot fgetxattr: Operation not supported
INFO: tar: .cache: Warning: Cannot fgetxattr: Operation not supported
INFO: tar: mc: Warning: Cannot fgetxattr: Operation not supported
...
in the backup logs.

As I can understand it regards to tar parameter --attr. What's wrong? How to fix that? I disabled acl for containers zfs subvolumes because it broke sockets permissions. Is it a cause?

 

[MSerg]

Yep. It's definitely because acltype==noacl but any aclinherit values brakes permission for sockets (for example: Dovecot /var/spool/postfix/private/auth must be 644 but zfs acl inherits 600 from parent directory).

Somebody has any ideas how to fix that?

 

[MSerg]

Well.
After I move all data from VM's subvolumes, recreate the zfs pool (I had need exclude one slow HDD from it), set acltype==noacl and move the data back these warnings in the backup log are gone. I don't know why but tar just stopped complaining about fgetxattr. I guess because in the first time the data were copied to zfs with posix acl... I don't know. If somebody can explain more professionally I will be glad, for me it's solved now.