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• If you boot from a CSN, an aggregate MIB for the entire cluster is available in /usr/share/

snmp/mibs.

• If you do not boot from a CSN, the MIB is located in the root directory of the DX Storage software

distribution.

2.3.5. Setting Up Network Load Balancing

Although the DX Storage nodes interact with client applications using the HTTP communication

protocol, the nodes are not simple web servers and they have operation behaviors that are different

from traditional web servers. For these reasons, the placement of DX Storage nodes behind an

HTTP load balancer device is not a supported configuration.

During normal operations, a DX Storage node routinely redirects a client to another node within the

cluster. When this happens, the client must be able to make another HTTP request directly to the

node to which they were redirected. Any mechanism that virtualizes the IP addresses of the DX

Storage nodes or tries to control the nodes to which a client connects will interfere with DX Storage

and will create communication errors.

This section discusses how to boot a cluster from the network using Intel's Preboot Execution

Environment (PXE) specification. This is commonly referred to as "network booting" and is

supported by most modern network adapters.

Note

If you boot from a CSN, you can skip this section because PXE booting is already

enabled.

PXE is one way to boot DX Storage nodes. You can also boot nodes from a USB flash drive as

discussed in

Section 4.2, "Configuring DX Storage"

Section 2.5, "Setting Up a Configuration File

To enable a cluster node to PXE boot, you must configure a DHCP server and a TFTP server to

support network booting.

Warning

DX Storage can erase all non-DX Storage data on hosts that are accidentally booted from

the network. When you set up your DHCP server, make sure it provides network booting

information to the correct network hosts only.

Following are the high-level tasks required to set up PXE booting:

Configure your DHCP server with next-server and filename

Configure the TFTP server with PXE bootstrap, configuration, and DX Storage

Set up the nodes' BIOS configurations for network

The following example shows the configuration lines from the Internet Systems Consortium (ISC)

DHCP server that is commonly available on UNIX systems. It shows the use of the next-server

or using a configuration file server as discussed

Server".

parameters.

booting.

files.

Version 5.0

December 2010