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• USB boot loader example.

Following is an example section of the syslinux.cfg that is contained in the root directory on

the USB flash drive.

label normal

kernel kernel

append initrd=fsimage ramdisk_size=128000 root=/dev/ram0

castor_cfg=http://172.16.1.200/castor/cfg-list.txt

Note

The append command must be entered on a single line. It is shown here on multiple

lines because of space limitations.

• Configuration list file example.

The castor_cfg kernel configuration parameter specifies a file that contains a list of URLs for all

the configuration files that are to be loaded by a DX Storage node. DX Storage configuration files

are evaluated in the order in which they are listed in the configuration list file.

Although DX Storage configuration parameters can be defined multiple times, the last definition is

the only one used. Using redefinitions of parameters, you can layer configuration files so that they

contain generally applicable values for a cluster, a group of similar nodes, and values specific to

one node.

An example configuration list file follows:

http://172.16.1.200/castor/cluster.cfg

http://172.16.1.200/castor/subcluster.cfg

http://172.16.1.200/castor/testnode.cfg

Each of the configuration files in the list file uses the same format as the DX Storage node.cfg

file. See the /caringo/node.cfg.sample in the DX Storage software distribution. For more

information about configuration parameters, see the DX Object Storage Administration Guide.

2.6. Network Devices and Priority

By default, all DX Storage Ethernet network adapters are encapsulated into a redundant bond

interface where one device is active and the others are backups. In this default mode, the first

network device is the preferred one. You can override this behavior in the following situations:

• Network adapter, such as an IPMI card, must be excluded from use

• Preferred network adapter change for network load management

• Bonding of multiple adapters for increased throughput

First, you might need to configure the ports on the switch for the appropriate mode as required by

that mode; these are normally link-aggregation or 802.3ad. DX Storage supports all Linux bonding

driver supported modes.

To override DX Storage's default handling of the network devices, you must edit one of the following

boot configuration files:

• syslinux.cfg if the node is booting from the USB flash drive

Version 5.0

December 2010