ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzahq_5.4.0.1/rzahqdisklessbootingoveriscsi.htm

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<title>Diskless booting over iSCSI</title>
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<h4 id="rzahqdisklessbootingoveriscsi">Diskless booting over iSCSI</h4>
<p>All of the iSCSI attached stand alone or IBM&reg; BladeCenter&trade; servers are diskless and require
an xSeries&reg; or IBM BladeCenter iSCSI host bust adapter (HBA) as
a boot device.</p>
<p>Both the i5/OS&trade; remote system configuration and the remote server iSCSI HBA must
be configured before you install or use a new integrated Windows server. See <a href="scrmtsys.htm#scrmtsys">Remote system configuration</a>.</p>
<p>The iSCSI HBA must be configured during the xSeries or IBM BladeCenter boot process using the adapter
CTRL-Q utility. It is recommended that it is configured as part of the initial
server set up. There is a minimal set of parameters required to be configured
in the hosted server iSCSI HBA. These parameters need to be matched to those
parameters configured in the remote system configuration object. The parameters
vary depending on the selected boot mode.</p>
<p>See the <a href="http://www.ibm.com/servers/eserver/iseries/integratedxseries/iscsireadme" target="_blank">iSCSI install
read me first</a>
<img src="www.gif" alt="Link outside the Information Center." />web page for details on how
to configure the hosted system iSCSI HBA as the iSCSI boot device. For details
on how to configure the set of parameters in the remote system configuration
object, see <a href="rzahqchangeremotesysconfig.htm#rzahqchangeremotesysconfig">Change remote system configuration properties</a>.</p>
<p><span class="bold">Enabling the hosted server boot device</span></p>
<p>The iSCSI HBA installed in an xSeries or IBM BladeCenter acts as a boot device during the
boot process, based on the configured parameters.</p>
<p>When the xSeries has only one iSCSI HBA, this adapter needs to be
configured as the boot device. iSCSI boot is enabled by default on all iSCSI
HBAs, but you must configure additional information.</p>
<p>When the xSeries server has multiple iSCSI HBAs installed, only
one of these must be configured as the boot device.</p>
<p>The IBM BladeCenter server iSCSI HBA is a dual port adapter. Only
one port is required to be configured as a boot device.</p>
<p><span class="bold">Boot Modes and Parameters</span></p>
<p>The iSeries&trade; iSCSI solution supports different boot modes. Depending on the
selected boot mode different boot parameters are required to be configured
in the hosted system iSCSI HBA.</p>
<p>The parameters are configured using the adapter CTRL-Q utility. A boot
device must be selected and configured the first time a server is being deployed.
It is recommended that the required parameters are configured as part of this
initial set up process.</p>
<p><span class="bold">Integrated DHCP server</span></p>
<p>The iSCSI attached server uses an integrated DHCP server when it is configured
to use the default or DHCP boot mode. This integrated DHCP server is not a
general purpose server. It is intended to exclusively deploy boot parameters
to the hosted server iSCSI HBA. The server is automatically configured with
the parameters provided in the remote system configuration when a network
server description (NWSD) is varied on. For more information, see <a href="rzahqintegratedhcpserver.htm#rzahqintegratedhcpserver">Integrated DHCP server</a>.</p><img src="deltaend.gif" alt="End of change" /><img src="deltaend.gif" alt="End of change" />
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