[gpfsug-discuss] AFM and Un-named orphed files

[IBM Spectrum Scale]

>Basic query, "What is an orphaned file?"

Orphan file have inode allocated but not initialized. Orphan entries are 
created during the readdir on the AFM fileset, and they get repaired 
(inode initialization) during the subsequent lookup.

>we get a list of "orphaned" "unnamed" entries pointing to the root of the 
fileset 200 plus times. Does anyone know what this might mean? 

Please ignore all the entries with fileset root path, these are false 
postives generated by the policy. We will fix this in future releases.


Regards, The Spectrum Scale (GPFS) team

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From:   "Peter Childs" <p.childs at qmul.ac.uk>
To:     "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>
Date:   05/24/2022 12:45 AM
Subject:        [EXTERNAL] [gpfsug-discuss] AFM and Un-named orphed files
Sent by:        "gpfsug-discuss" <gpfsug-discuss-bounces at gpfsug.org>



We are attempting to use AFM again, We are attempting to use it do do a 
quick migration between two GPFS file systems. Hence should only be using 
it for a few weeks.

https://www.ibm.com/docs/en/spectrum-scale/5.1.0?topic=afm-data-migration-by-using-migration-enhancements


Within a Read-Only Fileset, we are attempting to ensure that the cache is 
as complete as possible before we plan a date to switch over.

using checkUncached

mmafmctl fs1 checkUncached -j RO-1

we get a list of "orphaned" "unnamed" entries pointing to the root of the 
fileset 200 plus times. Does anyone know what this might mean? 

Basic query, "What is an orphaned file?"

My basic testing says they disappear once we switch to Local Update. so I 
suspect they may have something to do with "open or changed files on the 
source", which should go away once we have stopped work and are able to 
switch over. 

We're looking to get the final step in Local Update done in one go, (ie 
never start work in local update mode), flush the fileset and switch afm 
off hopefully getting the whole job done fairly quickly.


Peter Childs

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