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Efficiency and performance of the cluster interconnect can be increased by using so-called jumbo frames. Ethernet frames come in various sizes, usually limited to 1500 bytes by what is referred to as the maximum transmission unit (MTU). The frame size determines how much data can be transported with a single Ethernet frame the larger the frame, the higher the payload. Storing a larger payload inside an Ethernet frame means that less work must be done on the server and switch, providing more efficient

Figure 4-33. Select the Exceptions tab in the Windows Firewall window. 4. Scroll down through the Programs and Services list on the Exceptions tab until you see Remote Desktop, Windows Home Server Computer Backup, and Windows Home Server Transport Service, as shown in Figure 4-34.

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automatically be registered in Oracle Restart, and it will have a dependency on the ASM disk group(s) it uses. With Oracle Restart, it is finally no longer necessary to modify the database service_name initialization parameter; indeed, it is actually no longer recommended. Instead, database services should be defined using the srvctl add service command. Neither should you use the deprecated CREATE_SERVICE in DBMS_SERVICE procedure. You can query Oracle Restart meta-information much as you can with RAC. Many of the commands mentioned in the Managing Oracle Clusterware section can also be used for Oracle Restart. For example, the crsctl and srvctl command-line utilities support Oracle Restart with a non-clustered subset of their command-line arguments. Troubleshooting Oracle Restart is almost identical to troubleshooting RAC; the daemons started in Oracle Restart use the same log file locations as their RAC counterparts. Thus, the primary location for troubleshooting log files is $GRID_HOME/log/hostname.

Troubleshooting is an art every database administrator should master. When working with Grid Infrastructure, administrators typically find themselves trying to troubleshoot startup and initialization issues. Oracle provides a useful tool to collect troubleshooting information, called diagcollection.sh. It is located on all cluster nodes in $GRID_HOME/bin/diagcollection.sh. When called, this tool creates zip files that you can analyze yourself or attach to a service request. Since Oracle 10.2, a central location is available for almost all log files related to the operation of Clusterware/Grid Infrastructure. This location is at $GRID_HOME/log/hostname. The alerthostname.log file is usually the first point of call in case of problems. SCAN listeners comprise one exception to this rule; their log files are stored in the ADR. The ADR_BASE for the SCAN listeners is either $GRID_HOME/log/ or $ORACLE_BASE/diag/. The following sections provide more detail about ways to troubleshoot problems.

Startup issues in RAC are usually caused by a change in the hardware setup and configuration, and they can sometimes be difficult to diagnose. For example, changes to routers and firewalls on the network layer can have a negative impact on the health of the cluster. Operating system upgrades should also not be underestimated. A simple upgrade of the running kernel can have devastating effects for a system using ASMLib if the system administrator forgets to install the matching kernel modules. In our experience, the most common startup problem in Clusterware prior to version 11.2 issues concerned permissions on the raw (block) devices for the OCR and voting disk. Oracle 11.2 addresses this problem by storing OCR and voting disks in ASM. Should the cluster stack not start after a reboot or after stopping the cluster stack on a node, then there are a few locations to look for errors. Oracle s cluster verification tool recommends the following settings for the OCR when block devices are used: Owner: the account under which Clusterware/Grid Infrastructure was installed Group: oinstall Permissions: 0640

5. Select each one in turn and then click the Edit button. The Remote Desktop service is shown in Figure 4-35, the Windows Home Server Computer Backup program is shown in Figure 4-36, and the Windows Home Server Transport Service is shown in Figure 4-37.

Similarly, the following settings are expected for the voting files:

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