ノードがパニック状態になり、「Device not found」というエラーでブートできない

環境

問題

• ノードは自動ブートされません。
• "boot_ontap" LOADERで実行した後、システムは起動せず、次のエラーが報告されます。
• ローダーのブート試行時に、次のようなメッセージが表示されます。

LOADER-A> boot_ontap
Could not load fat://boot0/X86_64/freebsd/image1/kernel:Device not found
ERROR: Error booting OS on: 'boot0' file: fat://boot0/X86_64/freebsd/image1/kernel (boot0,fat)
*** command status = Device not found(-6)

LOADER-A> boot_primary
Loading X86_64/freebsd/image1/kernel:Failed: Device not found
Could not load fat://boot0/X86_64/freebsd/image1/kernel: Device not found
*** command status = Device not found(-6)

LOADER-A> boot_backup
Loading X86_64/freebsd/image2/kernel:Failed: Device not found
Could not load fat://boot0/X86_64/freebsd/image2/kernel: Device not found
*** command status = Device not found(-6)

LOADER-A> boot_ontap
Could not load fat://boot0/X86_64/freebsd/image2/kernel:Unknown error
ERROR: Error booting OS on: 'boot0' file: fat://boot0/X86_64/freebsd/image2/kernel (boot0,fat)
*** command status = Unknown error(-62)

LOADER-A> boot_primary
Loading X86_64/freebsd/image2/kernel:Failed: Unknown error
Could not load fat://boot0/X86_64/freebsd/image2/kernel: Unknown error
*** command status = Unknown error(-62)

LOADER-A> boot_backup
Loading X86_64/freebsd/image1/kernel:Failed: Error
Could not load fat://boot0/X86_64/freebsd/image1/kernel: Error
*** command status = Error(-1)

LOADER-A> boot_recovery
Bootable external device not found!
Boot Recovery failed
*** command status = Error(-1)

• ONTAPをネットブートしてインストールするときにも同様のエラーが発生します。例：

Please choose one of the following:
...
(7) Install new software first.
...
Selection (1-9)? 7

super-block backups (for fsck_ffs -b #) at:
192
******* Working on device /dev/ada0 *******
ada0: CAM_CMD_TIMEOUT, retrying (4 retries left)
ada0: CAM_CMD_TIMEOUT, retrying (3 retries left)
Jul 10 15:45:05 [localhost:ata.timeout.retry:notice]: ATA device timeout (ATA TIMEOUT (retrying), Device ada0:  (4 retries left)).
Partitioning of boot device complete
Install Failed.
fdisk: invalid fdisk partition table found
fdisk: WARNING: adjusting start offset of partition 1
   from 288 to 315, to fall on a head boundary
fdisk: WARNING: adjusting size of partition 1 from 33554016 to 33553989
   to end on a cylinder boundary
fdisk: Failed to write MBR. Try to use gpart(8).
fdisk: Failed to write MBR. Try to use gpart(8).
fdisk: Failed to write MBR. Try to use gpart(8).
fdisk: Failed to write MBR. Try to use gpart(8).
newfs_msdos: /dev/ada0s1: No such file or directory
ERROR: Unable to create a filesystem on the boot device.
umount: /mnt: not a file system root directory