Re: RFC: how to handle iscsi (and fcoe / zfcp) in rescue mode ?

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On 04/07/2010 05:27 PM, Hans de Goede wrote:
> We need to do something to make iscsi driver which need to be brought up
> manually available in rescue mode before we search for a / to rescue.
> 
> There are 2 options:
> 
> 1) Add some text mode UI stuff to do this
> 2) Make rescue mode graphical, and make rescue mode
>    go through the filter UI.
> 
> I think in the long run we will want to do 2). But I guess that is too late
> RHEL-6, so that we need to do 1) there.
> 
> Any input / comments is appreciated. I'll try to make some time
> to work on 1) (if no-one yells no) in the next few days.

Having an "Add zFCP" dialog in text mode would be nice. :)
Realistically, on s390, we have early DASD activation in linuxrc.s390
and this did work with the latest RHEL6 compose I had access to. We also
have FCP_*="..." boot options. However, they are currently only
activated late in storage/zfcp.py. If that could be triggered for rescue
mode as well, then we would have at least a workaround for all disk
types on s390 and that would be great.

> About 2). I think this is the logical and best thing to do in the
> long run, given that we are already doing kms even in rescue mode,
> we are already making rescue mode dependent on having working graphics,
> so I don't see any big blockers here.

2) won't work if you only have serial lines or even line-mode terminals.
With the last RHEL6 compose I had access to, rescue mode worked fine on
s390 since it does not yet seem to depend on a frame buffer or the like
and I think this dependency should never happen. Otherwise you would
also need to support early network configuration to provide VNC/X11.

Steffen

Linux on System z Development

IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294


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