[gpfsug-discuss] gpfs filesets question

[Bryan Banister]

If my memory serves… any move of files between filesets requires data to be moved, regardless of pool allocation for the files that need to be moved, and regardless if they are dependent filesets are both in the same independent fileset.
-Bryan

From: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> On Behalf Of J. Eric Wonderley
Sent: Thursday, April 16, 2020 12:37 PM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: Re: [gpfsug-discuss] gpfs filesets question

[EXTERNAL EMAIL]
Hi Fred:

I do.  I have 3 pools.  system, ssd data pool(fc_ssd400G) and a spinning disk pool(fc_8T).

I want to think the ssd_data_pool is empty at the moment and the system pool is ssd and only contains metadata.
[root at cl005 ~]# mmdf home -P fc_ssd400G
disk                disk size  failure holds    holds              free KB             free KB
name                    in KB    group metadata data        in full blocks        in fragments
--------------- ------------- -------- -------- ----- -------------------- -------------------
Disks in storage pool: fc_ssd400G (Maximum disk size allowed is 97 TB)
r10f1e8            1924720640     1001 No       Yes      1924644864 (100%)          9728 ( 0%)
r10f1e7            1924720640     1001 No       Yes      1924636672 (100%)         17408 ( 0%)
r10f1e6            1924720640     1001 No       Yes      1924636672 (100%)         17664 ( 0%)
r10f1e5            1924720640     1001 No       Yes      1924644864 (100%)          9728 ( 0%)
r10f6e8            1924720640     1001 No       Yes      1924644864 (100%)          9728 ( 0%)
r10f1e9            1924720640     1001 No       Yes      1924644864 (100%)          9728 ( 0%)
r10f6e9            1924720640     1001 No       Yes      1924644864 (100%)          9728 ( 0%)
                -------------                         -------------------- -------------------
(pool total)      13473044480                           13472497664 (100%)         83712 ( 0%)

More or less empty.

Interesting...


On Thu, Apr 16, 2020 at 1:11 PM Frederick Stock <stockf at us.ibm.com<mailto:stockf at us.ibm.com>> wrote:
Do you have more than one GPFS storage pool in the system?  If you do and they align with the filesets then that might explain why moving data from one fileset to another is causing increased IO operations.

Fred
__________________________________________________
Fred Stock | IBM Pittsburgh Lab | 720-430-8821
stockf at us.ibm.com<mailto:stockf at us.ibm.com>


----- Original message -----
From: "J. Eric Wonderley" <eric.wonderley at vt.edu<mailto:eric.wonderley at vt.edu>>
Sent by: gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org>
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Cc:
Subject: [EXTERNAL] [gpfsug-discuss] gpfs filesets question
Date: Thu, Apr 16, 2020 12:32 PM

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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