[gpfsug-discuss] gpfs filesets question

[Stephen Ulmer]

Is this still true if the source and target fileset are both in the same storage pool? It seems like they could just move the metadata… Especially in the case of dependent filesets where the metadata is actually in the same allocation area for both the source and target.

Maybe this just doesn’t happen often enough to optimize?

-- 
Stephen



> On Apr 16, 2020, at 12:50 PM, Oesterlin, Robert <Robert.Oesterlin at nuance.com> wrote:
> 
> Moving data between filesets is like moving files between file systems. Normally when you move files between directories, it’s simple metadata, but with filesets (dependent or independent) is a full copy and delete of the old data.
>  
>  
> Bob Oesterlin
> Sr Principal Storage Engineer, Nuance
>  
>  
> From: <gpfsug-discuss-bounces at spectrumscale.org <mailto:gpfsug-discuss-bounces at spectrumscale.org>> on behalf of "J. Eric Wonderley" <eric.wonderley at vt.edu <mailto:eric.wonderley at vt.edu>>
> Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Date: Thursday, April 16, 2020 at 11:32 AM
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Subject: [EXTERNAL] [gpfsug-discuss] gpfs filesets question
>  
> I have filesets setup in a filesystem...looks like: 
> [root at cl005 ~]# mmlsfileset home -L
> Filesets in file system 'home':
> Name                            Id      RootInode  ParentId Created                      InodeSpace      MaxInodes    AllocInodes Comment
> root                             0              3        -- Tue Jun 30 07:54:09 2015        0            402653184      320946176 root fileset
> hess                             1      543733376         0 Tue Jun 13 14:56:13 2017        0                    0              0 
> predictHPC                       2        1171116         0 Thu Jan  5 15:16:56 2017        0                    0              0 
> HYCCSIM                          3      544258049         0 Wed Jun 14 10:00:41 2017        0                    0              0 
> socialdet                        4      544258050         0 Wed Jun 14 10:01:02 2017        0                    0              0 
> arc                              5        1171073         0 Thu Jan  5 15:07:09 2017        0                    0              0 
> arcadm                           6        1171074         0 Thu Jan  5 15:07:10 2017        0                    0              0 
>  
> I beleive these are dependent filesets.  Dependent on the root fileset.   Anyhow a user wants to move a large amount of data from one fileset to another.   Would this be a metadata only operation?  He has attempted to small amount of data and has noticed some thrasing.
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