Products/HA/DellRedHatHALinuxCluster/Storage/PowerVault MD3000/Software

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Dell|Red Hat HA Linux > Storage > PowerVault MD3000 > Software

Contents

Software Installation

This section details the steps to install the required packages and setup a PowerVault MD3000 storage array.

NOTE: Until all software is properly installed, you may experience longer boot times and errors such as the following:

Buffer I/O error on device sdc, logical block 1
end_request: I/O error, dev sdc, sector 8

It is safe to ignore these errors until installation of all software has been completed.

Some of this software is available via the Dell Community Repository. Using the repository will simplify the installation process, as the available software can be installed directly on each node without invoking an interactive user interface within the X Windows System. For information on configuring access to the repository, see the section Installing Dell Community Repositories.

Any software not available on the Dell Community Repository can be obtained from the Dell PowerVault MD3000 Resource CD at support.dell.com.

Prerequisites

The following steps should be completed before installing any software.

Dell PowerVault MD3000 Resource CD

All necessary software is available on the Dell PowerVault MD3000 Resource CD. If you do not have the Resource CD, download the latest ISO image from the Dell Support website at support.dell.com.

Access the contents of the MD3000 Resource CD in one of two ways:

  • Insert the media into a system. If the X Window System is running, the media mounts automatically under the /media mount point and launches the main menu. If the media does not mount automatically or the X Window System is not installed, execute the following command:
[root]# mount /dev/cdrom {/path/to/mount/point/}

where {/path/to/mount/point/} is a directory that is used to access the contents.

  • If you have downloaded the ISO image, it is not necessary to create physical media. Mount the ISO image and access the contents with the following command:
[root]# mount -o loop {ISO filename} {/path/to/mount/point/}

where {/path/to/mount/point/} is a directory that will be used to access the contents.

NOTE: It is highly recommended that the contents of this Resource CD be made available on the network through a file sharing mechanism such as NFS.

DKMS

Some software discussed in these sections are provided in the form of a Dynamic Kernel Module Support (DKMS) package. For more information on DKMS, visit the project page at:linux.dell.com/dkms

RDAC Multi-Path Proxy Driver

Each cluster node has multiple paths to the same virtual disk via the SAS cables. This would typically cause issues as the cluster nodes are able to access the same data through different paths, which could lead to data corruption. However, the Multi-Path Proxy driver (MPP) consolidates all paths to the virtual disks into a pseudo device. This allows the nodes to access the pseudo device instead of a path directly. If a path failure occurs, the MPP driver automatically switches paths, and the node continues to access the same data through the same pseudo device but from the alternate path.

Red Hat Enterprise Linux includes a multipath driver as part of the base operating system with the package device-mapper-multipath. However, Dell provides RDAC Multi-Path Proxy driver that is specific to the PowerVault MD3000 storage array. It is recommended that you use the Dell-specific MPP driver with the Dell|Red Hat HA Linux Cluster.

NOTE: It is still possible to use device-mapper-multipath instead to connect to the PowerVault MD3000, but this is not supported by Dell. For more information on device-mapper-multipath, see the Using Device-Mapper Multipath guide at www.redhat.com/docs/manuals/enterprise/ and Bug 487293 on kernel support for the MD3000. You could then use the /dev/mapper/mpath device that the multipath service creates instead of the MPP software described in this section.

Installation Methods

There are two main methods for installing the required software; only one of these need to be completed.

NOTE: For a more automated solution for configuring your cluster, see dell-config-cluster instead.

Fully Interactive Installation

Fully Interactive Installation - This method requires the X Window System to be running on each node, in addition to some other software requirements for launching the installation applications. Only recommended for small clusters (2-4 nodes) or if installing the software for the first time.

Scriptable Installation

Scriptable Installation - This process does not require the X Window System to be installed on the nodes, and can be easily scripted on multiple nodes.



Dell|Red Hat HA Linux > Storage > PowerVault MD3000 > Software

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