[gpfsug-discuss] default owner and group for POSIX ACLs
Simon Thompson
S.J.Thompson at bham.ac.uk
Tue Oct 15 16:41:35 BST 2019
I thought Spectrum Protect didn't actually backup again on a file owner change. Sure mmbackup considers it, but I think Protect just updates the metadata. There are also some other options for dsmc that can stop other similar issues if you change ctime maybe.
(Other backup tools are available)
Simon
On 15/10/2019, 15:31, "gpfsug-discuss-bounces at spectrumscale.org on behalf of Jonathan Buzzard" <gpfsug-discuss-bounces at spectrumscale.org on behalf of jonathan.buzzard at strath.ac.uk> wrote:
On Tue, 2019-10-15 at 12:34 +0000, Paul Ward wrote:
> We are in the process of changing the way GPFS assigns UID/GIDs from
> internal tdb to using AD RIDs with an offset that matches our linux
> systems. We, therefore, need to change the ACLs for all the files in
> GPFS (up to 80 million).
You do realize that will mean backing everything up again...
> We are running in mixed ACL mode, with some POSIX and some NFSv4 ACLs
> being applied. (This system was set up 14 years ago and has changed
> roles over time) We are running on linux, so need to have POSIX
> permissions enabled.
We run on Linux and only have NFSv4 ACL's applied. I am not sure why
you need POSIX ACL's if you are running Linux. Very very few
applications will actually check ACL's or even for that matter
permissions. They just do an fopen call or similar and the OS either
goes yeah or neah, and the app needs to do something in the case of
neah.
>
> What I want to know for those in a similar environment, what do you
> have as the POSIX owner and group, when NFSv4 ACLs are in use?
> root:root
>
> or do you have all files owned by a filesystem administrator account
> and group:
> <ad service account>:<ad fileserver admin group>
>
> on our samba shares we have :
> admin users = @<ad fileserver admin group>
> So don’t actually need the group defined in POSIX.
>
Samba works much better with NFSv4 ACL's.
JAB.
--
Jonathan A. Buzzard Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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