Users Guide
Oracle Failover | Oracle Database Management
176 OMNM 6.5.3 Installation Guide
Example Tune-up
Example setup:
10.17.7.10 cbj-ip-do-orac01-priv
10.17.7.11 cbj-ip-do-orac02-priv
g2: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 4
inet 10.17.7.10 netmask ffff0000 broadcast 10.17.255.255
Tasks before making the change to jumbo frames for example servers g1 and g2:
Verify:
1
Check all devices between databases support jumbo frames.
2
Identify if failover/bonding/teaming is active for your g2 (g1, for example). Modify these as
appropriate.
3
Check with network engineering and system administrators who have activated jumbo frames
before to see if they have any other suggestions.
Steps:
1
Modify
MaxFramSize
in
/kernel/drv/g.conf
to
3
as described below on the man page
for g1 or g2.
Set the upper limit on the maximum MTU size the driver allows. All Intel gigabit adapters
(except the 82542-based Intel PRO/1000 adapter) allow the configuration of jumbo frames.
For an Intel PRO/1000 adapter that is later than 82571, (including 82571), the maximum
MTU accepted by the MAC is 9216. For others, the maximum MTU accepted by the MAC is
16128. Use ifconfig(1M) to configure jumbo frames. Use ifconfig with the adapter instance
and the MTU argument (ifconfig g0 mtu 9216) to configure adapter g0 for the maximum
allowable jumbo frame size.
Allowed values are:
0 Standard ethernet frames with a MTU equal to 1500.
1 Jumbo frames with a maximum MTU of 4010.
2 Jumbo frames with a maximum MTU of 8106.
3 Jumbo frames with a maximum MTU of 16298.
2
Shut down Oracle and CRS with
crsctl stop
on both nodes.
3
Modify the MTU and test on both nodes.
ifconfig g2 mtu 9194
From opposing nodes:
ping -c 2 -M do -s 8972 cbj-ip-do-orac01-priv
ping -c 2 -M do -s 8972 cbj-ip-do-orac02-priv
4
Set the MTU in the
/etc/hostname.g2
file on both nodes
existing options "mtu 9194"
5
Verify setting with
ifconfig -a
after reboots on both nodes, making certain the public
interface and VIPs remain at MTU 1500
6
Restart CRS and services on both nodes.