HPP Enterprises P4000 SAN - Manual (Page 14)

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have configured a single host in a resource pool, you can scale up with additional hosts to enhance
VM availability.
The sample SRs configured below utilize the iSCSI volumes described in the previous section.
Guidelines are provided for the following tasks:
 Synchronizing time between XenServer hosts
 Setting up networks and configuring network bonding
 Connecting to iSCSI volumes in the SR iSCSI Storage Repositories that will be created utilizing the
HP StorageWorks iSCSI volumes created in the previous section
 Creating a VM on the SR and best practices implemented ensuring that each virtual machine
maximizes its available iSCSI storage bandwidth
The section ends with a summary.
Synchronizing time
A server’s BIOS provides a local mechanism for accurately recording time; in the case of a XenServer
host, its VMs also use this time.
By default, XenServer hosts are configured to use local time for time stamping operations.
Alternatively, a network time protocol (NTP) server can be used to manage time for a management
group rather than relying on local settings.
Since XenServer hosts, VMs, applications, and storage nodes all utilize event logging, it is considered
a best practice – particularly when there are multiple hosts – to synchronize time for the entire
virtualized environment via an NTP server. Having a common time-line for all event and error logs can
aid in troubleshooting, administration, and performance management.
Note
Configurations depend on local resources and networking policy.
NTP synchronization updates occur every five minutes.
If you do not set the time zone for the management group, Greenwich
Mean Time (GMT) is used.
NTP for HP StorageWorks P4000 SAN
NTP Server configuration can be found on a Management Group’s Time tab. Common time for all
event and error logs can aid in troubleshooting, administration, and performance management. A
preferred NTP Server of 0.pool.ntp.org is used in this example shown in Figure 5.