Re: [9fans] VIA VT8237 SATA/RAID

[matt <mattmobile@proweb.co.uk>]

thanks to Ex-Cyber for this http://linux-ata.org/faq-sata-raid.html

You're right, it's a fake RAID

I just re-read fs(3) for #k and see interleaving of disks rather than 
mirroring

I shall take a look at that because I'm chasing RAID 0 not RAID 1

or rather I'm chasing I/O speed for CF and not really in plan9 because 
of no firewire, I'm just reporting in :)


>it sounds like plan 9 is not recognizing the via sata "raid".
>from what i've read about this chipset, this is fake raid.
>generally chipsets with fake raid present their drives as
>legacy ata unless you fiddle with the correct registers.  but
>in this case, i'm just guessing.  linux doesn't appear to
>recognize raid mode for the 8237's vt6240, although it
>does set up native mode.
>
>why not compare sd[EF]0/data.  if they are the same and
>you can mount one
>	mount /srv/dos /n/e: /dev/sdE0/data
>then you could use '#k' to do the mirroring in software.
>
>- erik
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>>Hi,
>>
>>I have an MSI K8T NEO2 FIR Motherboard with on-board VT8237 SATA/RAID
>>
>>I connected two SATA drives to it and used the BIOS Raid creator to 
>>create a striped RAID set.
>>
>>When I booted into Plan 9 I didn't get the single striped drive I was 
>>hoping for :
>>
>>--rw-r----- S 0 maht maht    15990784 Mar  5  2006 sdE0/data
>>-lrw------- S 0 maht maht           0 Mar  5  2006 sdE0/raw
>>--rw-r----- S 0 maht maht           0 Mar  5  2006 sdE0/ctl
>>--rw-r----- S 0 maht maht    15990784 Mar  5  2006 sdF0/data
>>-lrw------- S 0 maht maht           0 Mar  5  2006 sdF0/raw
>>--rw-r----- S 0 maht maht           0 Mar  5  2006 sdF0/ctl
>>
>>(yes they are 16Mb drives - they're compact flash in a SATA adapter)
>>
>>I rebooted and formatted them as FAT with Windows to test the striping 
>>which worked fine but but the result in Plan 9 was the same.
>>
>>
>>
>>I have an on-board SiL 3114 SATA/RAID at work so I'll try that one next
>>    
>>
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