HP 3PAR Citrix Implementation Guide

3. To control how often a ping is sent by the iSCSI initiator to the iSCSI target, change the
following parameter.
node.conn[0].timeo.noop_out_interval = [replacement_timeout]
To detect problems quickly in the network, the iSCSI layer sends iSCSI pings to the target. If
the ping times out, the iSCSI layer responds by failing running commands on the path where
the pings failed.
4. Set this parameter to 10 seconds.
node.conn[0].timeo.noop_out_interval = 10
5. To specify the time to wait for a Nop-out response before failing the connection, change the
following parameter: node.conn[0].timeo.noop_out_timeout =
[noop_out_timeout]
6. If the HP 3PAR array is running HP 3PAR OS 3.1.3 or later, set this parameter to 5 seconds:
node.conn[0].timeo.noop_out_timeout = 5
7. To set the host log into the iSCSI nodes every time the iSCSI daemon is started or the host is
rebooted, edit the iSCSI configuration in /etc/iscsi/iscsid.conf and change the values
of the following default settings:
node.startup = automatic
node.conn[0].startup = automatic
NOTE: The node.conn[0] .startup variable is optional and not defined in the default
iscsid configuration file.
Consult Citrix document CTX122852, iSCSI Service (open-iscsi) Startup Best Practices for
XenServer for full details on configuring iSCSI startup on the Host.
For more details, see the Citrix XenServer configuration limits, available at the Citrix Knowledge
Center:
Citrix Knowledge Center
8. To prevent one host from using up all the I/O buffers, you will need to throttle the host I/O
by reducing the node.session.cmds_max and node.session.queue_depth values.
9. Enable any other configuration changes such as CHAP authentication. For details, see
“Configuring CHAP for the iSCSI Host” (page 29).
Configuring Citrix 5.6 or 6.x iSCSI Settings with Device Mapper Multipathing
To configure Citrix 5.6 or 6.x iSCSI settings using Device Mapper multipathing, see “Modifying
the /etc/multipath.conf File for Citrix 5.6 or 6.x” (page 23)
Starting the iSCSI Daemon for Citrix 5.6 or 6.x
To start the iSCSI daemon for the Citrix host, complete the following steps:
1. To start the open-iscsi module, issue the following command:
# service open-iscsi start
Starting iSCSI initiator service: [ OK ]
Setting up iSCSI targets: iscsiadm: No records found!
iscsiadm: no records found!
Configuring Citrix 5.6 or 6.x for iSCSI 27