Forcing a disk rescan after %pre

[Dag Wieers]

On Thu, 2 Oct 2008, John Summerfield wrote:

> Dag Wieers wrote:
>>  We are integrating some pre-install scripts. One of the things we have now
>>  is that in the %pre phase the HW RAID controller is tested for "Virtual
>>  disks" and if none are found it will create a RAID config depending on the
>>  number of disks found.
>>
>>  The problem is that even when we created the RAID, restarted the RAID
>>  driver and created the device node (fdisk -l shows the new disk). Anaconda
>>  does not know about the new disk, likely because the scan for disks
>>  happened before.
>>
>>  I found a file /tmp/scsidisks and also rewrite that file, but still
>>  Anaconda does not update its view of the system after the %pre.
>>
>>  Does someone know how we can make Anaconda understand that we created a
>>  disk in the %pre ?
>
> I'm a little puzzled. Years ago (RHL 7.x I think) I used to initialise disks 
> in %pre with various incantations of dd and fdisk (one can pipe commands into 
> fdisk). That worked fine, and I'm pretty sure I created new partitions. fdisk 
> forces partition tables to be reread.
>
> Of course, it's possible anaconda has been broken since then:-)

This is not partitioning disks. This is in fact creating a /dev/sda where 
previously there was no local disk in the %pre.

-- 
--   dag wieers,  dag at wieers.com,  http://dag.wieers.com/   --
[Any errors in spelling, tact or fact are transmission errors]