[Novalug] Strange Disk Problem

[Greg F]

correction.  I intended to type raid 10 or raid 1+0.  I was thinking mdadm
will create pairs in raid 1 and LVM will stripe across all mirrors.

On Fri, Sep 10, 2010 at 3:36 PM, Mark Caudill <flakblas at me.com> wrote:

> Firstly, are you really going to try to setup RAID 1 across 12 drives? I'd
> investigate maybe RAID 10. To probe the drives try hdparm (usually in
> /sbin). hdparm -I /dev/sdX gets you a ton of info if I remember correctly.
>
> On Sep 10, 2010, at 3:16 PM, Greg F wrote:
>
> > Guys,
> > I'm stumped on this one and google doesn't seem to be helping.
> >
> > I'm using Ubuntu Server 10.04.1 on a Dell PowerEdge 2950 III with a Sun
> StorageTek PCI Express card and a Sun j4200 disk array with 12x 1TB disks.
> >
> > After performing a clean install the system shows 13 1TB disks attached.
>  How can this be?  Only 12 are connected???  I'm going to be setting up
> mdadm and LVM but was planning RAID 1 which requires an even number of
> disks.
> >
> > Fdisk -l shows 13 disks (/dev/sdb through /dev/sdn)
> > cat /var/log/messages shows 13 disks (/dev/sdb through /dev/sdn)
> > fstab file looks fine
> >
> > If i look in the BIOS for the StorageTek card it shows 12 disks and 1
> storage enclosure connected.
> >
> > This box used to have Windows on it which showed 12 disks, also used to
> have OpenSolaris which showed 12 disks so I'm inclined to think it's not a
> hardware problem.
> >
> > Has anyone ever seen this behavior before?  Seems like it might be a bug.
>
>
> --
> Mark C | flakblas at me.com | http://omgwtfrofl.com
>
>
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