Re: I'm looking at the files being journaled . . . .

Hello James,

Am 06.02.2025 um 23:08 schrieb James H. H. Lampert via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx>:

I'm looking at the files being journaled, in one particular journal, on a customer box. And I'm seeing some things that have me scratching my head.

This particular journal is tied to 7222 members in 2092 files. And a good many of these files are logicals of physical files that are themselves journaled.

What is the point of journaling logicals, when the based-on physical is itself journaled? Wouldn't that result in an awful lot of redundant entries?

There are two kinds of journaling:
- Access Path
- Physical file changes

It's perfectly valid to journal a (keyless) PF for changes, and LFs for quick AP recovery. As always, "it depends".

If you want the most speedy recovery after a power outage or the likes, you want to journal everything. But at the tradeoff of possible runtime performance degradation.

Not sure if this still stands a fact check with modern machines being equipped with SSDs or NVMe, though. Both of my allegations, about runtime performance, and speedy recovery when a abnormal IPL is processed.

:wq! PoC