[mythtv-users] Software RAID problems - theunspokenmythtvproblem?

[James C. Dastrup]

>for what its worth, I am using 2 firewire "encoders" with a local 7
>drive raid5.  I am using latest ATrpms on FC3.  kernel 2.6.12 smp.
>
> I have had no problems with simultaneous HD recordings (even starting
>at the same time), and the performance seems to be better than my old
>2 drive LVM configuration.
>
>No recording problems at all.  I actually stopped getting glitches in
>my HD records (part due to better RAID performance, part due to no
>longer running commercial detection)
>
 
Interesting you mentioned commercial detection as a source of problems.
I, too, have _almost_ no more problems with HD recording anymore on
my remote (NFS) software raid5 recordings, after I disabled 
commercial detection.
 
I did notice a couple glitches during a show last night. I was a little
surprised, because I haven't see any problems in days.  Afterwards,
I noticed my MRTG monitoring found a spike in CPU at the same time.
I think it was my cron job of backing up the mysql database, which
also backs it up to the same remote NFS server. Guess I should move
it to a better time.

So it seems that NFS storage and/or software raid, although it works,
is  just very sensitive to anything else going on.  Hopefully I can
make it a little more robust with gigabit links and maybe even
hardware raid in the future. But like others, I'm just afraid of hardware
raid in the long run, esp with the questionable ability to replace a 
failed HBA in the future with a compatible one.
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