[mythtv-users] RAID BTDT's

Steven Adeff adeffs.mythtv at gmail.com
Sun Apr 2 16:10:25 UTC 2006


On 4/2/06, chris at cpr.homelinux.net <chris at cpr.homelinux.net> wrote:
> On Sat, Apr 01, 2006 at 11:22:16PM +1100, Support [ Ian Ward ] wrote:
> > Anyone who has a large raid-5 array happy with the performance?  I have
> > to look into it, but can transcode be set to use a different disk for
> > it's temporary files ( perhaps a ramdisk for /tmp ) ?
>
> "Large" is in the eye of the beholder.
>
> I'm running with three 160Gb drives.  They were partitioned so that
> hda1 and hdc1 impliment a small RAID-1 (mirrored) /boot partition with
> LILO installed on both MBRs (so that I can just swap the cables if
> hda dies and the system will still boot), hda2, hdc2 and hde1 provide
> swap, and hda3, hdc3 and hde2 make up a RAID-5 root partition (which
> holds *everything*).  I'm running on a 2.8GHz CPU and have 1Gb of RAM
> and the overhead attributable to software RAID is negligible.  The
> only real issue I ever had to face was a problem with IRQ assignments
> for my PCI IDE card for the third drive.  My BIOS insisted on giving
> it the same IRQ as my ethernet card, so it would run just fine until
> I started a playback on a remote machine, at which time the IDE card
> would drop interrupts and panic the kernel.  I solved that problem,
> and now the system is rock solid.
>
> If Myth was capable of spreading the recordings among multiple
> directories then I would probably have used RAID-5 for a much smaller
> root partition and used the remaining space on all three drives as
> separate non-redundant storage.  The concern there is simply
> capacity, not performance.

you could move the recordings using myth_archive_job.pl (I think thats
the script). It should move the actual file to an archive directory of
your choosing and update the db to link to it.

--
Steve


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