Cheers Corin,
You're the man! I was able to take your simplest suggestion and it worked
great: I changes the c, h, and s on hda. I rebooted and it didn't stick,
but I changed them again, and creatd my partitions same as hdc. After exiting
fdisk and restarting fdisk, the partition table was still there but I got
warnings about partitions not ending on cylinder boundaries. A quick reboot
later and dmesg reports the same drive parameters and everything works great!
Thanks for the brilliant and speedy response! Both of my RAID1's are currently
happily adding their mirrors!
David
On Thu, Jun 28, 2001 at 02:20:15PM +0100, Corin Hartland-Swann wrote:
>
> Hi David,
>
> On Thu, 28 Jun 2001, David Nedved wrote:
> > I have two identical IDE hard drives in my system that I am in the process of
> > building a RAID1 on, and for some reason they have different CHS... I built
> > the RAID1 on hdc, with hda as a failed-drive, and I would like to make the
> > same partitions on hda then hotadd them, but with the different geometries I
> > can't get the partions exactly the right size. This is an Asus TX97 board,
> > and these drives are each master on their IDE bus with no other drives.
>
> I have encountered this problem a number of times before. I think someone
> once explained why this happens (even with identical drives), but I'm
> afraid I've forgotten it.
>
> I do, however, have a couple of possible solutions:
>
> > hda: 58633344 sectors (30020 MB) w/2048KiB Cache, CHS=3649/255/63
> > hdc: 58633344 sectors (30020 MB) w/2048KiB Cache, CHS=58168/16/63
>
> First, let's pick one of the geometries... take the first one.
>
> > I'm hoping that there's something I can do in LILO involving either the
> > linear command or something else that I only partly understand that can
> > cause them to be recognized the same.
>
> After using Linux for near on five years, I have finally discovered the
> bootparam(7) man page. I previously thought that all that lilo/kernel
> command line stuff was undocumented voodoo, and it was surprising to find
> most of it is actually documented.
>
> Anyway, if you add to the append line/kernel command line "hda=3649,255,63
> hdc=3649,255,63" then they will both be beaten into submission to share
> geometries.
>
> IIRC you may also be able to just set the geometry on hdc to the same as
> hda when you partition it in fdisk (see the eXpert menu), and then the
> kernel picks it up automatically from the partition table, but YMMV.
>
> Hope this helps,
>
> Corin
>
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