Bug#666399: s390-dasd fails to work with >20 devices visible (mostly in LPAR mode)
Hi,
On Wed, Dec 16, 2015 at 02:15:10PM +0100, Hendrik Brueckner wrote:
> Honestly, I would propose a different approach to limit the DASD device
> available to the Debian installer. I believe that typical customer
> environments have set up their LPARs (and z/VM guest virtual machines)
> to limit the number of devices to those required/designated for the LPAR.
>
> Of course, there can be the case where LPARs almost have access to (almost)
> every device. For this case, the solution is to use "cio_ignore" kernel
> parameter. With this kernel parameter you can control the devices that
> are visible to the Linux instance.
>
> For example,
>
> cio_ignore=all,!ipldev,!condev,!0.0.da00-0.0.da10
>
> ignores all devices except the console device, the IPL device, and the
> range of devices from 0.0.da00 to 0.0.da10 that might be DASDs or any
> other devices. Note that you can change the cio_ignore settings at runtime,
> so you can later make additional devices visible.
>
> With this solution, there is no hardcoded limit necessary and the user
> can still see the list of DASDs to be configured.
>
> What do you think?
it'd be nice to see that in the installation manual, I think, so that
it's at least documented.
Kind regards and thanks
Philipp Kern
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