[CentOS] SCSI device not detected after 4.5 update

[Adam Huffman]

On Thu, 31 May 2007, Bob Chiodini wrote:

> 
> 
> Adam Huffman wrote:
> >After updating to Centos 4.5, I found that one of the LUNs on an
> >external SCSI array wasn't being detected.  If I add the device
> >manually after boot
> >
> >echo "scsi add-single-device 0 0 1 1" > /proc/scsi/scsi
> >
> >it is detected.  I can then use the LVM tools to activate it and then
> >mount the LV on the device.
> >
> >It doesn't seem to be kernel related as I rebooted into a 4.4 kernel
> >and the same thing happened.  There's no error message I can see at
> >boot, it just doesn't see the device.
> >
> >It's using a QLogic HBA but with the upstream module, not the
> >out-of-tree QLogic one.  It worked fine under 4.4.
> >
> >I suspect changes to dmsetup and/or multipath.  Has anyone else seen
> >something similar?
> >
> >Adam
> Adam,
> 
> I'm not sure of the why, but this link may help solve the problem.
> Maybe the initrd for the latest kernel was not built with the max_luns
> option.
> 
> http://publib.boulder.ibm.com/infocenter/dsichelp/ds8000ic/index.jsp?topic=/com.ibm.storage.ssic.help.doc/f2c_linuxlunconfig_2hsaga.html
> 
> 
> Read the man page on mkinitrd.   I'd rename the originals before
> rebuilding.  If you're daring, you'll the -f option to mkinitrd to
> rebuild over the originals.
> 

Bob,

Thanks so much for that - it worked a treat.  I wasn't feeling daring so
I renamed the originals and created a new grub entry.

I'll see if there's anything in bugzilla about this and report it if
not.

Thanks again,
Adam

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