System Loop ? Help !

[Philipp Rusch <Philipp.Rusch@xxxxxxxxxxxx>]

Hello all,
We recently added disks to model 400 with a 6502 in extension box.
Now we have 6x 6606 and 4x 6607 (these are new).
The first two 6606 disks are a mirror pair at MFIOP for the load source
the rest is in two RAID sets.
To add the disk we did stop RAID and mirror, added the new 4  6607s
and started all over again. Went perfectly ... (monday evening)
Tuesday all the day running okay, in the night we do a scheduled IPL
and now the machine is at SRC C600 4257 for hours !

What shall I do ? We need that system ...

Any help much appreciated,

Regards from germany, Philipp Rusch

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