[gpfsug-discuss] Combine different rules

[david_johnson at brown.edu]

Filesets and storage pools are for the most part orthogonal concepts.  You would sort your users and apply quotas with filesets. You would use storage pools underneath filesets and the filesystem to migrate between faster and slower media. Migration between storage pools is done well by the policy engine with mmapplypolicy.  Moving between filesets is entirely up to you, but the path names will change. Migration within a filesystem using storage pools preserves path names.  

  -- ddj
Dave Johnson

> On Nov 1, 2017, at 6:55 AM, Matthias.Knigge at rohde-schwarz.com wrote:
> 
> Hi at all, 
> 
> I configured a tiered storage with two pools. 
> 
> pool1        >>        fast        >>        ssd 
> pool2        >>        slow        >>        sata 
> 
> First I created a fileset and a placement rule to copy the files to the fast storage. 
> 
> After a time of no access the files and folders should be moved to the slower storage. This could be done by a migration rule. I want to move the whole project folder to the slower storage. 
> 
> If a file in a project folder on the slower storage will be accessed this whole folder should be moved back to the faster storage. 
> 
> The rules must  not run automatically. It is ok when this could be done by a cronjob over night. 
> 
> I am a beginner in writing rules. My idea is to write rules which listed files by date and by access and put the output into a file. After that a bash script can change the attributes of these files or rather folders. 
> 
> This could be done by the mmchattr command. If it is possible the mmapplypolicy command could be useful. 
> 
> Someone experiences in those cases? 
> 
> Many thanks in advance! 
> 
> Matthias
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