Geom striped mirrors questions

[Arne Wörner]

--- Tony Holmes <tony at crosswinds.net> wrote:
> I am trying to set up a RAID 10 data array using 12 identical 33gb scsi
> disks. 2 are being kept for spares
> 
> First I set up a single slice on each disk using:
> 
> fdisk -I -1 /dev/da{0,1,2,3,4,5,6,7,8,9,10,11,12,13}
>
What is this good for?

> Jul 21 08:06:57 db kernel: GEOM_STRIPE: Disk mirror/dm0 attached to ds0.
> Jul 21 08:06:57 db kernel: GEOM_STRIPE: Cannot add disk mirror/dm0c to ds0
> (error=17).
> Jul 21 08:06:57 db kernel: GEOM_STRIPE: Disk mirror/dm1 attached to ds0.
>
I would interpret this as follows:
gstripe takes dm0 and dm1 into its ds0...
When it sniffed at dm0c it saw, that it has the same meta data as dm0, which
results in error number (errno) 17 (EEXISTS /usr/include/errno.h)...

Resolution:
You should delete the fdisk meta data in the beginning (first 63 sectors) of
each disk for "cosmetic" reasons, because:
1. It is not used...
2. It creates unnecessary warnings...

:)

-Arne


       
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