X7-2 OS panic repeat after MotherBoard replacement.

Asset ID:	1-72-2394339.1
Update Date:	2018-05-21
Keywords:

Solution Type Problem Resolution Sure

Solution 2394339.1 : X7-2 OS panic repeat after MotherBoard replacement.

Applies to:

Exadata X7-2 Hardware - Version All Versions to All Versions [Release All Releases]
Oracle Server X7-2 - Version All Versions to All Versions [Release All Releases]
Oracle Server X7-2L - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

X7-2 OS got panic repeat after MotherBoard replacement.

[ 13.212080] md: bind<nvme0n1>
[ 13.220642] md/raid0:md306: md_size is 12502458368 sectors.
[ 13.230492] md: RAID0 configuration for md306 - 1 zone
[ 13.239963] md: zone0=[nvme0n1/nvme1n1]
[ 13.247923] zone-offset= 0KB, device-offset= 0KB, size=6251229184KB
[ 13.260843]
[ 13.266173] md306: detected capacity change from 0 to 6401258684416
[ 33.222483] dracut: Assembling MD RAID arrays
[ 33.234973] dracut: Autoassembling MD Raid
[ 74.512934] dracut Warning: No root device "block:/dev/md24p5" found

[ 74.526379] dracut Warning: Boot has failed. To debug this issue add "rdshell" to the kernel command line.
[ 74.541262] dracut Warning: Signal caught!

[ 74.551049] dracut Warning: Boot has failed. To debug this issue add "rdshell" to the kernel command line.
[ 74.566075] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100
[ 74.566075]
[ 74.584482] CPU: 10 PID: 1 Comm: init Not tainted 4.1.12-94.7.8.el6uek.x86_64 #2
[ 74.596995] Hardware name: Oracle Corporation ORACLE SERVER X7-2L/ASM, MB MECH, X7-2L, BIOS 42017100 08/20/2017
[ 74.612703] 0000000000000000 ffff8817d3bafd58 ffffffff816b4c5d ffffffff819704c0
[ 74.625556] ffff882fd1518000 ffff8817d3bafdd8 ffffffff816b49b9 ffff882f00000010
[ 74.638326] ffff8817d3bafde8 ffff8817d3bafd88 ffffffff811096f8 ffff8817d3bafdb8
[ 74.651141] Call Trace:
[ 74.658269] [<ffffffff816b4c5d>] dump_stack+0x63/0x86

Changes

The systemboard was replaced or BIOS was reset to defaults.

Cause

The example panic above indicates that the Linux OS was unable to find/mount the root filesystem. If running Windows, the OS would fail in a similar manner experiencing an "INACCESSIBLE_BOOT_DEVICE" BSOD (Blue Screen of Death, STOP code 0X0000007B)
The X7-2/X7-2L uses two internal SATA M.2 SSD's, which are RAIDable via the Intel RSTe (Rapid Storage Technology Enterprise). After the board is replaced, if the BIOS/UEFI configuration is not restored, or if restoration fails then the onboard controller's mode will revert to the default AHCI (Advanced Host Controller Interface), which is not compatible with the Intel RSTe RAID volume, thus causing the OS to panic/BSOD/etc on boot because it cannot find or mount the root/OS filesystem.

Solution

Change the BIOS SATA setting from AHCI to RAID.
(NOTE - This solution applies ONLY to X7-2/X7-2L's which are running the Linux or Windows OS's. Solaris supports ACHI SATA mode only.

Procedure:
When prompted, press F2 (Or ctrl+e on serial terminal) to enter the BIOS/UEFI setup utility.

On the BIOS Setup Utility screen, select the Advanced tab, select PCH SATA Configuration, and press Enter.

BIOS1

On the PCH SATA Configuration screen, select Configure SATA as.

BIOS2

In the Configure SATA as pop up, select RAID and press Enter.

BIOS3

On the Save and Exit screen, select Save Changes and Exit and press Enter.

Observe POST and confirm that the OS now boots up correctly. If it does not contact the owner of your Oracle Technical Service Request (SR), or open a new Service Request if you do not already have one open.

Please refer Installation Guide for details
https://docs.oracle.com/cd/E72463_01/html/E72440/grobi.html#scrolltoc
Configure RAID Using RSTe

Note:If you follow Installation Guide change SATA setting to RAID, please just follow step 1 ~7 , SKIP step 8~16 (DON’T CREATE RAID AGAIN)

RELATED INFORMATION:
Back Up the BIOS Configuration
https://docs.oracle.com/cd/E37444_01/html/E37446/z40001541481533.html#scrolltoc

Restore BIOS Configuration
https://docs.oracle.com/cd/E37444_01/html/E37446/z40001541481574.html#scrolltoc

References

https://docs.oracle.com/cd/E72463_01/html/E72440/grobi.html#scrolltoc
https://docs.oracle.com/cd/E37444_01/html/E37446/z40001541481533.html#scrolltoc

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