Asset ID:	1-72-2188955.1
Update Date:	2016-10-31
Keywords:

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Solution Type  Problem Resolution Sure

Solution  2188955.1 :   Linux OS on Server not starting after configuring Hugepages  

Created from <SR 3-13399665261>

Applies to:

Exadata X4-2 Eighth Rack - Version All Versions and later
Linux OS - Version Oracle Linux 5.10 with Unbreakable Enterprise Kernel [2.6.32] and later
Information in this document applies to any platform.

Symptoms

Server is not starting

Changes

Configuring HugePages

Cause

Huge page value set to high number resulting in kernel panic
  

Solution

Log in as single user mode and restored the old value of vm.nr_hugepages
 

At Exadata booting
1. Press space key
2. Splash screen will display
3. Give password by pressing P
4. Edit the Second line by pressing e
at the end of num insert 1 init=/bin/bash and press
5. Open the console host using putty
a. login to putty session of ILOM
b. start /SP/Console
c. mount -o remount,rw /
6. /etc/sysctl.conf
Remove the commented value
Remove the recently changed huge page setting
7. sysctl -p

Restart the Node 

References

<NOTE:2065029.1> - Exadata node fails to boot "dracut Warning: No root device "block:/dev/disk/by-label/DBSYS" found"
<NOTE:1569485.1> - How To Use Oracle SFTP Services
<NOTE:2003016.1> - OS Bootup on Exadata hangs after GRUB screen, but GUI hostconsole does not show error or accept entry
<NOTE:1547088.2> - How to Upload Files to Oracle Support
<NOTE:166650.1> - Working Effectively With Oracle Support - Best Practices

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