[gpfsug-discuss] GPFS magic options for Samba

[Jez Tucker]

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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