Pete Davis wrote:
What happens if you do cat /dev/video0 > /dev/null instead of movie.mpg.
This
will tell us if it's some hard drive or I/O (dma maybe) issue. At least
that's
my theory.
--Brian
Brian, your theory seems good. The problem doesn't seem to appear when I do
this.
I know Linux doesn't really have defrag utilities because it supposedly
doesn't need them (well, that's not entirely true, I know there's at least
one commercial one). So what can I do here to diagnose the exactly problem
and hopefully fix it?
Pete
What FS is on the linear array ? Is it ext3 ? If it was created with
the default settings it may be having trouble storing large video files.
I believe the default block size is 4K. That consumes a lot of
inodes. It's possible you're running out of inodes on that filesystem.
You could try dumpe2fs and take a look at the free inodes and block size.
You're not going to want to hear this, but you are probably better off
reformatting your video partition with a different FS that is better
suited to large files out of the box like XFS or JFS. EXT3 needs to be
set up differently for the expected workload at format time.
Take a look at 'man mke2fs' and have a look at the -T option. I think
you probably need a filesystem with -Tlargefile or -Tlargefile4 rather
than the default which creates half as many inodes than blocks and sets
the block size to 4K.
Yan
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