ACFS Support with Oracle Unbreakable Enterprise Linux Kernel

ACFS Support with Oracle Unbreakable Enterprise Linux Kernel

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In September 2010 Oracle introduced an own Unbreakable Enterprise Linux kernel based on the version 2.6.32. For more information see Oracle White Paper http://www.oracle.com/us/technologies/linux/uek-for-linux-177034.pdf

The installation of the new Oracle kernel is very easy. All you need is to install the oracle-linux RPM:

vm213:~ # yum install oracle-linux

Loaded plugins: rhnplugin, security
Setting up Install Process
Resolving Dependencies
--> Running transaction check
...

Dependencies Resolved

================================================================================================================
Package                     Arch           Version                             Repository                 Size
================================================================================================================
Installing:
oracle-linux                noarch         5.0.0-7.el5                         ol5_x86_64_latest         2.7 k
Installing for dependencies:
busybox                     x86_64         1:1.2.0-7.el5                       ol5_x86_64_latest         1.2 M
kernel-uek                  x86_64         2.6.32-100.26.2.el5                 ol5_x86_64_latest          25 M
kernel-uek-firmware         noarch         2.6.32-100.26.2.el5                 ol5_x86_64_latest         1.0 M
kexec-tools                 x86_64         1.102pre-126.0.1.el5_6.4            ol5_x86_64_latest         593 k
latencytop                  x86_64         0.5-2.el5                           ol5_x86_64_latest          32 k
net-snmp                    x86_64         1:5.3.2.2-9.0.1.el5_5.1             ol5_x86_64_latest         718 k
net-snmp-perl               x86_64         1:5.3.2.2-9.0.1.el5_5.1             ol5_x86_64_latest         197 k
net-snmp-utils              x86_64         1:5.3.2.2-9.0.1.el5_5.1             ol5_x86_64_latest         188 k
ql2xxx-firmware             noarch         1.01.01-0.2.el5                     ol5_x86_64_latest         442 k
reflink                     x86_64         0.1.0-1                             ol5_x86_64_latest          24 k

Transaction Summary
================================================================================================================
Install      11 Package(s)
Upgrade       0 Package(s)

Total download size: 29 M
Is this ok [y/N]: y
Downloading Packages:
(1/11): oracle-linux-5.0.0-7.el5.noarch.rpm                                              | 2.7 kB     00:00    
(2/11): reflink-0.1.0-1.x86_64.rpm                                                       |  24 kB     00:00    
(3/11): latencytop-0.5-2.el5.x86_64.rpm                                                  |  32 kB     00:00    
(4/11): net-snmp-utils-5.3.2.2-9.0.1.el5_5.1.x86_64.rpm                                  | 188 kB     00:00    
(5/11): net-snmp-perl-5.3.2.2-9.0.1.el5_5.1.x86_64.rpm                                   | 197 kB     00:00    
(6/11): ql2xxx-firmware-1.01.01-0.2.el5.noarch.rpm                                       | 442 kB     00:01    
(7/11): kexec-tools-1.102pre-126.0.1.el5_6.4.x86_64.rpm                                  | 593 kB     00:01    
(8/11): net-snmp-5.3.2.2-9.0.1.el5_5.1.x86_64.rpm                                        | 718 kB     00:01    
(9/11): kernel-uek-firmware-2.6.32-100.26.2.el5.noarch.rpm                               | 1.0 MB     00:02    
(10/11): busybox-1.2.0-7.el5.x86_64.rpm                                                  | 1.2 MB     00:03    
(11/11): kernel-uek-2.6.32-100.26.2.el5.x86_64.rpm                                       |  25 MB     00:58    
...

Complete!

But after server reboot a surprise. You cannot mount your ACFS filesystems! The reason –> Oracle kernel modules have not been loaded

grid@vm213:~/ [grid] uname -a
Linux vm213 2.6.32-100.26.2.el5 #1 SMP Tue Jan 18 20:11:49 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

grid@vm213:~/ [grid] acfsdriverstate -orahome $ORACLE_HOME supported
ACFS-9459: ADVM/ACFS is not supported on this OS version: '2.6.32-100.26.2.el5'
ACFS-9201: Not Supported

It's a pity! At least on database servers using ACFS we cannot use the new kernel. According to BUG 10185375 the new kernel will be supported with the next patch set 11.2.0.3. The only solution now is to install and activate the latest Red Hat compatible kernel

grid@vm213:~/ [grid] uname -a
Linux vm213 2.6.18-238.1.1.0.1.el5 #1 SMP Thu Jan 20 23:52:48 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

grid@vm213:~/ [grid] acfsdriverstate -orahome $ORACLE_HOME version
ACFS-9325:     Driver OS kernel version = 2.6.18-8.el5(x86_64).
ACFS-9326:     Driver Oracle version = 100804.1.

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