[mythtv-users] RAID thread

[Jarod C. Wilson]

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On Saturday 24 April 2004 00:50, Nathan Nottingham wrote:
> 	Alas, I'm answering my own thread...
>
> 	But I'm sure others would like to see these results.  I was
> originally using a Asus P4P800 SE motherboard.  Unfortunately, this board
> has 2 IDE buses and my new PCI IDE card is still being shipped.  My wife
> kindly donated her Asus P4P800 Deluxe after a little kicking, screaming,
> and general unrest.  This board is very similar to the SE with the
> important addition of a VIA4610 RAID controller.
>
> 	While the chipset isn't supported in the 2.4.25 kernel it didn't
> take much effort to modify the general PCI drivers to accommodate the new
> bus.
>
> 	DMA was enabled for all drives in both cases.  Nothing fancy with
> hdparm (yet).
>
> #####################################
>
> 2xIDE buses with 4 drives
>
> dvdserver root # cat /proc/mdstat
> Personalities : [raid5]
> read_ahead 1024 sectors
> md0 : active raid5 ide/host0/bus1/target1/lun0/part1[2]
> ide/host0/bus1/target0/lun0/part1[1]
> ide/host0/bus0/target1/lun0/part1[0]
>    488391680 blocks level 5, 128k chunk, algorithm 2 [3/3] [UUU]
>    [>....................]  resync =  3.7% (9119976/244195840)
> finish=231.8min speed=16896K/sec
>
> #####################################
>
>
> 4xIDE buses with 4 drives (32k chunk):
>
> dvdserver root # cat /proc/mdstat
> Personalities : [raid5]
> read_ahead 1024 sectors
> md0 : active raid5
> ide/host2/bus1/target0/lun0/part1[2]
> ide/host2/bus0/target0/lun0/part1[1]
> ide/host0/bus1/target0/lun0/part1[0]
>    488391808 blocks level 5, 32k chunk, algorithm 2 [3/3] [UUU]
>    [==>..................]  resync = 10.3% (25283084/244195904)
> finish=70.6min speed=51648K/sec
>
> #####################################

That looks more like it! Its even a greater than 2x speedup... Thank you, I 
*knew* there were cases where you'd get a monster performance hike. ;-)

- -- 
Jarod C. Wilson, RHCE

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