Dell DX6004S Руководство по началу работы - Страница 13

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Dell DX6004S Руководство по началу работы
• 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.

2.4. Setting Up PXE Booting

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"
in
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:
1.
Configure your DHCP server with next-server and filename
2.
Configure the TFTP server with PXE bootstrap, configuration, and DX Storage
3.
Set up the nodes' BIOS configurations for network

2.4.1. Setting Up the DHCP Server for PXE Booting

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
Copyright © 2010 Caringo, Inc.
All rights reserved
or using a configuration file server as discussed
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parameters.
booting.
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Version 5.0
December 2010