To improve the performance of Stratus Cloud Availability Services, you can optionally make the following changes to your KVM-FT pair groups. The changes include:
Enabling jumbo frames on each KVM-FT compute node in an FT pair group and the Ethernet switch that connects them.
Change the maximum transmission unit (MTU) from the default of 1500 bytes of payload to the maximum of 9000 bytes. Setting this maximum packet size increases network efficiency by reducing the overall number of packets that each contain networking protocol overhead. (If you want to enable jumbo frames, you must change this setting on each KVM-FT compute and Ethernet switch before the new setting will take effect.)
To improve the performance of Availability Services:
Log on to the management utility for the Ethernet switch that connects the A-links from your KVM-FT compute nodes. Enable jumbo frames on the switch by setting the MTU size to 9000 bytes. If needed, restart the Ethernet switch to enable the new setting. See the documentation for your Ethernet switch for more information.
Switch to the /etc/sysconfig/network-scripts directory:
# cd /etc/sysconfig/network-scripts
List the files in the network-scripts directory to display the ifcfg-device network startup files (for example, ifcfg-eth2). Locate the two ifcfg-device startup files that represent the A-link network interfaces for the compute node.
If the MTU property is already present, change the MTU value to 9000 bytes; otherwise, add a new MTU=9000 line at the bottom of the file. For example:
DEVICE=eth2
HWADDR=A0:36:9F:2A:BD:3C
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
MTU=9000
Repeat step 4 for the second A-link network interface in the compute node.
To apply the network startup changes, restart the compute node, as follows:
# shutdown -r now
In the system BIOS setup utility for the compute node, locate the Power Management properties. If possible, locate a property that controls CPU power and performance. Typically, the default setting throttles CPU performance to save energy. To improve the performance of the KVM-FT compute node, change the value of the property to maximize performance.
BIOS properties vary by manufacturer and model. See the documentation for your system to locate the correct power-saving property, if present.
When the operating system starts, log on to the console of the compute node and display the status of each A-link network interface. Verify that the MTU value is set to 9000. For example, to verify the MTU value for eth2, execute the following command:
# ifconfig eth2 eth2 Link encap:Ethernet HWaddr A0:36:9F:2A:BD:3C inet addr:10.200.11.50 Bcast:10.200.11.255 Mask:255.255.255.0 inet6 addr: fe80::225:90ff:fed9:70aa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:3209 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:147614 (144.1 KiB) TX bytes:468 (468.0 b)
Product Support and Downloads
|
About Stratus
|
Product Documentation (PDF Format)
|
About Help
|