Yes I tried that first, but it seems from the testing I’ve done, the attributes 
I want are not accessible from the policy engine in 5.1.9. Co-pilot suggests 
they maybe in 5.2.x
Which we cant go to until we’ve converted from TCT to AFM, which is what I need 
this for.

Kindest regards,
Paul

Paul Ward
TS Infrastructure Architect
Natural History Museum
T: 02079426450
E: [email protected]<mailto:[email protected]>
[cid:[email protected]]

From: gpfsug-discuss <[email protected]> On Behalf Of Jan-Frode 
Myklebust
Sent: 23 December 2025 21:50
To: gpfsug main discussion list <[email protected]>
Subject: Re: [gpfsug-discuss] help/ advice with external helper apps for ILM 
policy engine

Policy engine can use xattrs using something like "WHERE 
xattr('user.xattrname') LIKE 'value'".

I don't currently have any TCT systems available to check, but are there no 
xattrs you could use a xattr like above to figure out which pool it's in? Use 
f.ex. "mmlsattr -L -d filename" to check which xattrs are set for a given file.



  -jf
On Tue, Dec 23, 2025 at 11:19 AM Paul Ward 
<[email protected]<mailto:[email protected]>> wrote:
Hi,

has anyone written external helper apps for the ILM policy engine.

we are running TCT, planning to move files from on-premise COS to AWS, but I 
need to detect which cloudpool the files are currently in.
The policy engine doesn’t appear to be able to access the extended file 
attributes indicating which cloudpool a migrated file is in.
So I am trying to use an external helper script, but execution of the policy 
seems to stall at the point it should use the helper script.

I will also need to use a help app to move the files from COS to AWS as the 
mmcloudgateway CLI will recall then migrate, but the policy engine detects the 
files are already migrated so refuses to ‘migrate’ them again.
I plan to call the CLI version

Any advice?

Kindest regards,
Paul

Paul Ward
TS Infrastructure Architect
Natural History Museum
T: 02079426450
E: [email protected]<mailto:[email protected]>
[cid:[email protected]]

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