On Fri, Jan 30, 2004 at 07:48:19PM +0200, Martti Kuparinen wrote:
> Hi!
> 
> I'm updating our RAID-1 documenation to match -current's new tricks
> but I got few problems...
> 
> I have two identical 120 GB disks on my server (NetBSD/i386 1.6ZI):
> 
> # dmesg | grep wd
> wd0 at atabus0 drive 0: <IC35L120AVV207-1>
> wd0: drive supports 16-sector PIO transfers, LBA48 addressing
> wd0: 115 GB, 239340 cyl, 16 head, 63 sec, 512 bytes/sect x 241254720 sectors
> wd0: 32-bit data port
> wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
> wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA data transfers)
> wd1 at atabus1 drive 0: <IC35L120AVV207-1>
> wd1: drive supports 16-sector PIO transfers, LBA48 addressing
> wd1: 115 GB, 239340 cyl, 16 head, 63 sec, 512 bytes/sect x 241254720 sectors
> wd1: 32-bit data port
> wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
> wd1(viaide0:1:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA data transfers)
> 
> I've configured RAID-1 for everything but I still have something wrong in
> wd0's disklabel as a kernel crash dump will corrupt /home (raid0e).
> 
> With the configuration below, I went to DDB by pressing Ctrl+Alt+Esc and
> typed sync. After reboot the raid0e had a corrupted super-block. So I
> assume the crash dump overwrites raid0e's beginning.
> 
> I used the old method to calculate the real offset of raid0b
> 
> # dc
> 241254657	# wd0a
> 241254528	# raid0d
> -p
> 129		# size of internal RAID structures
> 
> 63		# offset of wd1a
> 129		# size of internal RAID structures
> +
> 16777216	# size of raid1a
> +p
> 16777408	# offset of swap within wd0
> 
> But this is wrong somehow. What am I doing wrong?

This looks good, and I find the same value using another way to compute it.
If you create on wd0 a partition starting at 192, can you mount
it and find the same value as raid0a ?

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--