RHEL, OL 5.7, 5.8
How to configure Multipath Using Equallogic Host Integration Tool Kit (HIT) & on Linux for Oracle?
What is Equallogic Host Integration Toolkit (HIT)?
The Equallogic Host Integration Toolkit (HIT) is a collection of applications and utilities to simplify the configuration and administration of Dell Equallogic PS Series Storage Arrays.
Host Integration Tools for Linux provides the following features:
Improve I/O performance by intelligently routing I/O directly to the correct PS Series array member, thereby reducing intra-group I/O forwarding.
Initially, let’s see how to configure the equallogic HIT Kit. Download the Hit Kit (1.1) for Linux. If you have a support ID and Password, download from the below link https://support.equallogic.com/support/download.aspx?id=10235
To install HIT Kit for Linux, perform the following steps.
Create a directory in which you will mount ISO image:
# mkdir -p /media/iso –nogpgcheck
Mount the ISO image in the /media/iso directory:
# mount -o loop equallogic-host-tools-version.iso /media/iso
The installation script provides several options for installing under certain conditions. To see these options, enter /media/iso/install --help. To run the installation script for a fresh install, simple enter:
NOTE: The iSCSI RPM should have been installed/ is a per-requisite for the installation to proceed.
Steps to Discover and Configure the Storage:
First the Equallogic storage should be discovered, in-order to discover the Equallogic storage, use the Remote Setup Command Line Interface (RSWCLI).
Discovering a PS Series Array:
# rswcli –discover –detail
Note: For the Discovery command to work, make sure that your host network is configured in the Storage IP range.
Once the PS Array is discovered, group access should be granted to the group that you would like to access. We use the RSWCLI command to grant the group access.
# rswcli --add-group-access --gn groupname --gip groupip
Example #rswcli --add-group-access --gn hitkitgroup --gip 188.8.131.52
The next step is to discover the targets.
# iscsiadm -m discoverydb
Use the Below Command to discover new Targets (after the initial discovery):
# iscsiadm -m discoverydb [-I iface] -p group-IP-address -t st -o new –D
# iscsiadm -m discoverydb -p 184.108.40.206 -t st -o new –D
Logging into a Volume with Multipath I/O:
To login to a volume with multipath we use the ehcmcli commands . These commands are used to simplify login and logout from iSCSI targets. Now let’s see how to login using the ehcmcli commands.
# ehcmcli login --target target_name --portal portal
Note: # ehcmcli status command displays the status of each volume, the paths its used to login and the target names
# ehcmcli login --target iqn.2001-05.com.equallogic:0-290c06-52f7c99c6- 1a2000001aa4f479-myvolume
Login succeeded. Device to mount:
To set a volume for automatic login on the next system startup, use the --login-at-boot option with the ehcmcli login command:
# ehcmcli login --target target [--portal portal] --login-at-boot
Conditions for Configuring Multipath Devices:
1) Certain conditions should be met to successfully to configure multipath devices using HIT Kit for Linux. Use of the multipathd Daemon is not required. Do not run this daemon before configuring multipath devices. Use the following command to disable multipath service.
#chkconfig multipathd off
#service multipathd stop
2) If you must create, delete, or modify the partition table on a volume, use a partition management utility (for example, fdisk) against the EqualLogic DM devices present under.
where volume_name is the name specified at volume creation and p# is the partition number (for example, p1, p2, etc.)
Note:- When configuring, Creating Oracle ASM Disks and when using EqualLogic Hit Kit, Make sure you use the devices under the location /dev/eql/device_name.