You don't really need to worry about log/journalled file systems with regard to fragmenting. Bear in mind that XFS is a fully 64-bit file system and was designed from day one to address 9 exabytes!

Now, there are nice things applicable to Mythtv that XFS has or could be taken advantage of:

- Huge single file size. We're talking 16 or 64 terabye file sizes on even the oldest implementation on Linux.

- XFS supports "realtime" allocation. Rather than using the normal tree structure, you can create a subvolume that is better suited to the predictability that realtime A/V applications require. I suspect that SGi (the originators of XFS) did this so they had a file system capabile of serious Video-on-Demand (VoD) applications for cable companies.


-marc

On Mon, 13 Dec 2004, Chris Petersen wrote:

Should I be performing some type of defragmentation on my LVM? The drive
seems to be thrashing around quite a bit more recently and fragmentation
comes to mind from my windows experience.

afaik, none of the *nix filesystems need to be defragmented. they're all pretty good about keeping fragmentation down below 1%.


"thrashing around" could just be the filesystem shuffling things around to prevent fragmentation. or maybe they just hit some kind of "full" threshhold that ends up with more noisy operations.

-Chris
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