Alternatives to ACL

[Rwac]

I need to restrict access on a directory so that one group has rwx and one group has ro.

Usually I would implement ACL, but the volume is under *constant* I/O so would adding acl to /etc/fstab and re-mount cause an issue?

If so, I would need an alternative - do any exist?

 

[FirebarUK]

There is a performance hit with ACL's but it's negligible for all but the most demanding apps.

Also, if you were to use tune2fs or put the option into fstab and do a mount -o remount or mount -a - I guess the system should be clever enough to not drop any data (I guess this would depend on cache sizes etc.) during this point. I'm not even sure what state the filesystem goes into during a remount.

 

[Rwac]

Update:

Remounting the device with ACL did not cause any issues and met the requirements perfectly.