PowerScale Gen6/MLK node fails to boot with GEOM start failed

When rebooting a node for any reason, the node fails to come back online. If you attach to the node with a null modem cable, the boot sequence ends with messaging similar to the following:

kldload: acpi_sel0: <System Error Log (SEL) GPE Hook> numa-domain 0 on acpi0
an error occurred while loading module lnv. Please check dmesg(8) for more details.
Early ELF ldconfig path: /lib:/usr/lib:/usr/lib/compat:/usr/local/lib:/usr/likewise/lib:/usr/local/apache2/lib:/usr/local/apache2/bin:/usr/local/lib/compat/pkg:/usr/lib:/usr/likewise/lib:/usr/local/lib/compat/pkg:/usr/local/lib/perl5/5.32/mach/CORE:/usr/local/llvm40/lib
<isi_rc> Executing script hostid
Setting hostuuid: 03000200-0400-0500-0006-0c0000002000.
Setting hostid: 0x0fb9b77f.
Executing GEOM bootdisk startup...
 
GEOM start failed
To prevent a DL situation, contact Dell EMC Customer Support immediately:
United States: 1 800 782 4362 (1 800 SVC 4EMC)
Canada: 1 800 543 4782 (1 800 543 4SVC)
Worldwide Country Code: 1 508 497 7901
 
 
Command Options:
1) Enter recovery shell
2) Continue booting
3) Reboot
option>

If you enter the recovery shell and check the mounted file systems, root is mounted as read-only:

# mount
/dev/mirror/root1 on / (ufs, local, read-only)
devfs on /dev (devfs, local)
#

Checking the boot partitions, you see something similar to:

# gpart list | grep -B9 bootdisk | egrep "uuid|Name|label"|paste - - -
4. Name: da16p4    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid
4. Name: da17p4    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid
4. Name: da18p4    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid
3. Name: da19p4    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid
4. Name: da21p4    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid
2. Name: ada0p2    rawuuid: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx           label: bootdiskid

There is an invalid boot partition on ada0. Gen6/MLK nodes should not have a boot partition on that device.

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