[gpfsug-discuss] mmchfs -k nfs4 impacts?
Losen, Stephen C (scl)
scl at virginia.edu
Mon Aug 29 22:18:15 BST 2022
Hi Jonathan,
Thanks for your reply. I didn't see "-k samba" in the docs. I'll look some more. Also I didn't mention that we also need NFSv4 access and native GPFS, this will not be SMB-only. It will actually be mostly GPFS native. I don't think existing ACLs will be adversely affected. In a test filesystem with "-k all" I set some POSIX ACLs and converted the filesystem to "-k nfs4" and the result looked reasonable. Plus I ran mmgetacl -k nfs4 on numerous files/dirs with POSIX ACLs in our production filesystem and the results looked promising.
Glad to know that switching the filesystem to -k nfs4 won't be a huge performance hit.
Steve Losen
Research Computing
University of Virginia
scl at virginia.edu 434-924-0640
On 8/29/22, 5:07 PM, "gpfsug-discuss on behalf of Jonathan Buzzard" <gpfsug-discuss-bounces at gpfsug.org on behalf of jonathan.buzzard at strath.ac.uk> wrote:
On 29/08/2022 18:52, Losen, Stephen C (scl) wrote:
> Hi,
>
> We want to export SMB shares via Spectrum Scale CES nodes. The
> filesystem has ACL style set to “all” and we must set it to nfs4 with
> mmchfs -k nfs4 . The filesystem currently has millions of files with
> POSIX ACLs. Will this mmchfs command result in any performance impact,
> such as a major rewrite of metadata? Thanks.
>
The operation will complete very quickly. The bigger risk is that your
existing ACL's will go "puff".
As I understand it GPFS stores each different ACL only once and then it
points each file to the ACL. When you change the ACL type they get nuked
from recollection but it is a decade now since I played around with
that. I stick to NFSv4 ACL's since then because well POSIX ACL's are a
bit naff frankly.
I personally would have thought "-k samba" would have been preferable
for your use case mine you ;-)
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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