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Some of the best networking experiences when running RAC on AIX

Some of the best networking experiences when running RAC on AIX

1. Oracle recommends using Etherchannel to configure Nic binding, and Nic binding in master / slave mode is recommended. Master / master (Active/Active) mode is not recommended because the master / slave mode is more stable. Note: starting from 11.2.0.2, Redundant Interconnect with Highly Available IP (HAIP) has been added to Oracle's cluster software Grid Infrastructure (GI) to achieve high availability and load balancing of cluster private networks. In other words, with HAIP, you can achieve redundancy of private network NICs without using Nic binding (for more information about HAIP, please refer to the introduction to Redundant Interconnect with Highly Available IP (HAIP)).

2. Another recommendation of Oracle for networks is to use Jumbo Frames, which can be enabled if the network card and switch support a size of 9000 MTU. MTU (Maximum Transmission Unit) refers to the largest network transmission unit, and the default is generally 1500 bytes. Since the data transferred between RAC instances may be at 2K to 64K or greater, when the MTU is 1500, it will cause the data to be split up and have an impact on performance. After starting Jumbo Frames, the MTU can reach 9000 bytes, which reduces the number of times the data is split. For more information, refer to the MOS documentation:

Recommendation for the Real Application Cluster Interconnect and Jumbo Frames (Note 341788.1)

3. If some parameters of the network are not set properly, wait events such as "gc cr multi block request" may occur. If you find that this wait event is high in AWR, you need to check whether the settings of the UDP parameters udp_sendspace and udp_recvspace meet the following requirements:

For AIX:

O set udp_sendspace > = [(DB_BLOCK_SIZE * DB_FILE_MULTIBLOCK_READ_COUNT) + 4096], but not less than 65536.

O set udp_sendpace with a udp_recvspace of 4 to 10 times

O because sb_max must be > = udp_recvspaceIf, you may need to increase the value of sb_max (default is 1048576)

O if the parameter setting of udp is unreasonable, "socket buffer overflows" may be generated. If this value is not 0, you need to increase udp_recvspace:

Netstat-s | grep "socket buffer overflows"

4. CRS and RAC do not require which protocol the switch uses, but if Etherchannel is used, as long as the protocol is compatible and stable with Etherchannel.

There are some network requirements in the following documentation:

Minimum Software Versions and Patches Required to Support Oracle Products on IBM Power Systems (Note 282036.1)

10 Gigabit Ethernet

. LACP timeout: Use the "long timeout" switch setting for the amount of time to wait

Before sending LACPDUs.

Flow control: Enable flow control at the switch port and on the server side ports

(using HMC) for the 10GE adapter or 10GE HEA configuration.

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