[gpfsug-discuss] question about using compression and snapshots

[Alec]

I don't know if this would help you but I use a mod function on the inode
of the file to break down the workload into smaller batches across the file
system when doing compression and encryption options.

In the policy..   WHERE MOD(INODE,10)<=shares

If you ran your encryption as an mmyapplypolicy -M shares=1
sleep 300
mmyapplypolicy -M shares=2

You'd break your work down into 10 steps with 5 minute rests.  And the
shares would be cumulative so you won't miss any files when you get to 10
it's really doing 1-10.. number of shares can be any arbitrary number.

Hope that helps.

Alec




On Thu, Sep 15, 2022, 9:01 AM Bill Anderson <andersnb at ucar.edu> wrote:

>
>   Hi All,
>
>   We're trying to use both compression and snapshots on our filesystem,
> but find that we can't delete snapshots when compression is running. Since
> compression can take days or longer to run on our large filesystem (80+
> PB), it's making it impractical to use both on our filesystem.
>
>    Has anyone had experience with using both of these features and have
> any tips on their coexistence?
>
>   Thanks!
>
>   Bill
>
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