How to install ASMLib on Oracle Linux 7 with Unbreakable Enterprise Kernel (UEK)

Oracle Corp. has released Oracle Linux 7 23rd of July 2014.
In the meantime Oracle Corp. is supporting Oracle Linux 7 for both Oracle 11g release 2 and Oracle 12c release 1.

I have not found detailed steps to install ASMLib for Oracle Linux 7 in the Oracle documentation. The Oracle Database Installation Guide 12c Release 1 (12.1) for Linux has some documentation but the example references Red Hat Entreprise Linux 5.

Linux configuration

I have used Oracle Linux 7.0 with VirtualBox 4.3.20 to install ASMLib on Oracle Linux 7. I have installed Oracle Linux with many default settings but I have configured 2 network interfaces:

  • the first one is attached to NAT and is used to have Internet access from Linux virtual machine (VM).
  • the second one is attached to Host-Only Adapter and is used by SSH to connect to Linux VM.

All steps have been run with root user account. Default kernel used by Oracle Linux 7 is UEK:

# uname -a
Linux ol7twsa.localdomain 3.8.13-35.3.1.el7uek.x86_64 #2 SMP Wed Jun 25 15:27:43 PDT 2014 x86_64 x86_64 x86_64 GNU/Linux

I have found easier to configure network interfaces from command line in Linux console rather than using the GUI during Linux installation especially for routing. I have used following steps ( is Linux VM IP address and is my internet box IP address).

First I have modified network interface configuration files:

# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
# cat /etc/sysconfig/network-scripts/ifcfg-enp0s8

I have brought both network interfaces up:

# ifup enp0s3
# ifup enp0s8

And I have checked IP addresses and internet connectivity:

# ip addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:63:38:de brd ff:ff:ff:ff:ff:ff
    inet brd scope global enp0s3
    inet6 fe80::a00:27ff:fe63:38de/64 scope link
       valid_lft forever preferred_lft forever
3: enp0s8:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:19:7f:a8 brd ff:ff:ff:ff:ff:ff
    inet brd scope global enp0s8
    inet6 fe80::a00:27ff:fe19:7fa8/64 scope link
       valid_lft forever preferred_lft forever
# ip route
default via dev enp0s3  proto static  metric 1024 dev enp0s3  proto kernel  scope link  src dev enp0s8  proto kernel  scope link  src
# ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_seq=1 ttl=50 time=53.8 ms
64 bytes from ( icmp_seq=2 ttl=50 time=52.6 ms
--- ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 52.611/53.216/53.821/0.605 ms

I have also disabled SELinux otherwise ASMLib may not restart after rebooting and you may find following strange messages in /var/log/oracleasm:

Creating /dev/oracleasm mount point: mkdir: cannot create directory '/dev/oraclesm': Permission denied
Unable to create mount point /dev/oracleasm

I have disabled SELinux with following /etc/selinux/config:

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.

and I have rebooted Linux VM.

ASM device configuration

My host system is my Windows 8.1 PC: I have created a 10 GB VirtualBox disk for the ASM device:

>vboxmanage createhd --filename ol7twsa.sata.1.vdi --size=10240 --format VDI --variant fixe
Disk image created. UUID: 9ba8edeb-eeb3-4871-91cc-b6379c1ca754

I tried to attach this disk to the VirtualBox machine with the command line interface but it failed:

>vboxmanage storageattach ol7twsa --storagectl "SATA" --port 1 --device 0 --type hdd --medium ol7twsa.sata.1.vdi
VBoxManage.exe: error: Code E_FAIL (0x80004005) - Unspecified error (extended info not available)
VBoxManage.exe: error: Context: "AttachDevice(Bstr(pszCtl).raw(), port, device, DeviceType_HardDisk, pMedium2Mount)" at
line 744 of file VBoxManageStorageController.cpp

VirtualBox shows that the disk is attached to Linux VM but I had to detach the disk, attach it again with GUI and to reboot the Linux VM to see the corresponding Linux device:

# ls -al /dev/sdb*
brw-rw----. 1 root disk 8, 16 Jan 17 19:43 /dev/sdb

I have created a disk partition with fdisk:

# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x74577cf0.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519):
Using default value 20971519
Partition 1 of type Linux and of size 10 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

# ls -al /dev/sd*
brw-rw----. 1 root disk 8,  0 Jan 17 19:43 /dev/sda
brw-rw----. 1 root disk 8,  1 Jan 17 19:43 /dev/sda1
brw-rw----. 1 root disk 8,  2 Jan 17 19:43 /dev/sda2
brw-rw----. 1 root disk 8, 16 Jan 17 19:44 /dev/sdb
brw-rw----. 1 root disk 8, 17 Jan 17 19:44 /dev/sdb1

ASMLib packages installation

The default Oracle Linux 7 setup has the right configuration for YUM repository. Next step was to install oracleasm-support package:

# yum install oracleasm-support
ol7_UEKR3                                                | 1.2 kB     00:00
ol7_latest                                               | 1.4 kB     00:00
(1/5): ol7_UEKR3/x86_64/updateinfo                         |  22 kB   00:00
(2/5): ol7_latest/x86_64/updateinfo                        |  89 kB   00:00
(3/5): ol7_latest/x86_64/group                             | 652 kB   00:01
(4/5): ol7_UEKR3/x86_64/primary                                                   | 5.0 MB  00:00:07
(5/5): ol7_latest/x86_64/primary                                                  | 6.9 MB  00:00:08
ol7_UEKR3                                                                                        122/122
ol7_latest                                                                                     7417/7417
Resolving Dependencies
--> Running transaction check
---> Package oracleasm-support.x86_64 0:2.1.8-3.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

 Package                       Arch               Version                   Repository              Size
 oracleasm-support             x86_64             2.1.8-3.el7               ol7_latest              79 k

Transaction Summary
Install  1 Package

Total download size: 79 k
Installed size: 242 k
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/7Server/ol7_latest/packages/oracleasm-support-2.1.8-3.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Public key for oracleasm-support-2.1.8-3.el7.x86_64.rpm is not installed
oracleasm-support-2.1.8-3.el7.x86_64.rpm                                          |  79 kB  00:00:01
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Importing GPG key 0xEC551F03:
 Userid     : "Oracle OSS group (Open Source Software group) "
 Fingerprint: 4214 4123 fecf c55b 9086 313d 72f9 7b74 ec55 1f03
 Package    : 7:oraclelinux-release-7.0-1.0.3.el7.x86_64 (@anaconda/7.0)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : oracleasm-support-2.1.8-3.el7.x86_64                                                  1/1
Note: Forwarding request to 'systemctl enable oracleasm.service'.
ln -s '/usr/lib/systemd/system/oracleasm.service' '/etc/systemd/system/'
  Verifying  : oracleasm-support-2.1.8-3.el7.x86_64                                                  1/1

  oracleasm-support.x86_64 0:2.1.8-3.el7


Note that a Linux service named oracleasm has been created by yum:

# systemctl is-enabled oracleasm.service

However there is no oracleasm module in Linux kernel:

# lsmod | grep oracleasm

But oracleasm module is on disk for UEK kernel and does not need to be installed or downloaded:

# modinfo oracleasm
filename:       /lib/modules/3.8.13-35.3.1.el7uek.x86_64/kernel/drivers/block/oracleasm/oracleasm.ko
description:    Kernel driver backing the Generic Linux ASM Library.
author:         Joel Becker 
version:        2.0.8
license:        GPL
srcversion:     A311C50149C77E13C360349
intree:         Y
vermagic:       3.8.13-35.3.1.el7uek.x86_64 SMP mod_unload modversions
signer:         Oracle CA Server
sig_key:        C8:F6:00:04:DB:C9:C1:D4:E9:DD:B8:57:24:12:44:BA:7D:A9:55:6C
sig_hashalgo:   sha256
parm:           use_logical_block_size:Prefer logical block size over physical (Y=logical, N=physical [default]) (bool)

ASMLib configuration

I have created dba group and oracle user account:

# groupadd dba
# useradd -G dba oracle

I have loaded ASMLib driver:

# /usr/sbin/oracleasm init
Creating /dev/oracleasm mount point: /dev/oracleasm
Loading module "oracleasm": oracleasm
Configuring "oracleasm" to use device physical block size
Mounting ASMlib driver filesystem: /dev/oracleasm

oracleasm module now has been loaded into Linux kernel:

# lsmod | grep oracleasm
oracleasm              53453  1

and I have configured ASMLib:

# /usr/sbin/oracleasm configure -i
Configuring the Oracle ASM library driver.

This will configure the on-boot properties of the Oracle ASM library
driver.  The following questions will determine whether the driver is
loaded on boot and what permissions it will have.  The current values
will be shown in brackets ('[]').  Hitting  without typing an
answer will keep that current value.  Ctrl-C will abort.

Default user to own the driver interface []: oracle
Default group to own the driver interface []: dba
Scan for Oracle ASM disks on boot (y/n) [y]:
Writing Oracle ASM library driver configuration: done

Testing ASMLib

I have created an ASM disk:

# oracleasm createdisk ASM1 /dev/sdb1
Writing disk header: done
Instantiating disk: done
# oracleasm querydisk ASM1
Disk "ASM1" is a valid ASM disk
# oracleasm listdisks

ASMLib has now been successfully installed and configured.

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