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How to create Root aggregate across external shelf during initialization

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Hi everyone,
First time posting here.

On a new FAS2720(9.5P5) and DS212C, I would like to configure ADP using a total of 24 NL-SAS disks.
So, I actually executed the steps 9a and 9b from the boot menu, but a Kernel Panic occurred after executing step 9b.
When a Kernel Panic occured, the following message was displayed.

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Jun 27 17:48:57 [localhost: raid.autoPart.start: notice]: System has started auto-partitioning 6 disks.
Jun 27 17:48:58 [localhost: raid.autoPart.done: notice]: Successfully auto-partitioned 6 of 6 disks.
Unable to create root aggregate: 5 disks specified, but at least 7 disks are required for raid_tec
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According to HWU, FAS2720 can configure ADP with 24 disks.
Is this due to a bug in the product? Or is there any problem with the procedure?

As a side note, I think that it is a problem that occurs only when an external shelf is connected,
because there is no problem in performing the same procedure without connecting DS212C.

 

Could you please help?
Many thanks


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