[gpfsug-discuss] GPFS magic options for Samba
Jez Tucker
Jez.Tucker at rushes.co.uk
Thu May 10 08:39:09 BST 2012
If you're on 3.4.0-13, can you confirm the operation of DMAPI Windows mounts.
Any serious issues?
> -----Original Message-----
> From: gpfsug-discuss-bounces at gpfsug.org [mailto:gpfsug-discuss-
> bounces at gpfsug.org] On Behalf Of Jonathan Buzzard
> Sent: 09 May 2012 23:58
> To: gpfsug main discussion list
> Subject: Re: [gpfsug-discuss] GPFS magic options for Samba
>
> Jonathan Buzzard wrote:
> >
> > Not documented, but I believe there are four ;-)
> >
> > allowSambaCaseInsensitiveLookup
> > syncSambaMetadataOps
> > cifsBypassShareLocksOnRename
> > cifsBypassTraversalChecking
> >
>
> Just add to this I believe there are some more, mostly because they are
> between the first two and last two in mmchconfig Korn shell file
>
> They are
>
> allowSynchronousFcntlRetries
> allowWriteWithDeleteChild
>
> Not sure what the first one does, but the second one I am guessing allows
> you to write to a folder if you can delete child folders and would make
> GPFS/Samba follow Windows schematics closer. Over the coming days I
> hope to play around with some of these options and see what they do.
>
> Also there is an undocumented option for ACL's on mmchfs (I am working on
> 3.4.0-13 here so it's not even 3.5) so that you can do
>
> mmchfs test -k samba
>
> and then
>
> [root at krebs1 bin]# mmlsfs test
> flag value description
> ------------------- ------------------------
> -----------------------------------
> -f 32768 Minimum fragment size in bytes
> -i 512 Inode size in bytes
> -I 32768 Indirect block size in bytes
> -m 1 Default number of metadata
> replicas
> -M 2 Maximum number of metadata
> replicas
> -r 1 Default number of data
> replicas
> -R 2 Maximum number of data
> replicas
> -j cluster Block allocation type
> -D nfs4 File locking semantics in
> effect
> -k samba ACL semantics in effect
> -n 32 Estimated number of nodes
> that will mount file system
> -B 1048576 Block size
> -Q user;group;fileset Quotas enforced
> none Default quotas enabled
> --filesetdf no Fileset df enabled?
> -V 12.07 (3.4.0.4) Current file system version
> 11.05 (3.3.0.2) Original file system version
> --create-time Fri Dec 4 09:37:28 2009 File system creation time
> -u yes Support for large LUNs?
> -z yes Is DMAPI enabled?
> -L 4194304 Logfile size
> -E no Exact mtime mount option
> -S no Suppress atime mount option
> -K always Strict replica allocation
> option
> --fastea yes Fast external attributes
> enabled?
> --inode-limit 1427760 Maximum number of inodes
> -P system;nearline Disk storage pools in file
> system
> -d
> gpfs19nsd;gpfs20nsd;gpfs21nsd;gpfs22nsd;gpfs23nsd;gpfs24nsd Disks in file
> system
> -A yes Automatic mount option
> -o none Additional mount options
> -T /test Default mount point
> --mount-priority 0 Mount priority
>
>
> Not entirely sure what samba ACL's are mind you. Does it modify NFSv4
> ACL's so they follow NTFS schematics more closely?
>
>
> JAB.
>
> --
> Jonathan A. Buzzard Tel: +441382-386998
> Storage Administrator, College of Life Sciences
> University of Dundee, DD1 5EH
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