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If your netbook is like mine, you don t have a whole lot of LCD screen real estate. Net book screens are small to begin with, so it s a good idea to keep the viewable area you do have be as clean as possible. You might have seen special screen wipes available for sale at computer stores. They come in little packages of 10 or 15 wipes for $5. Are they serious In a pinch, you can use a soft cotton cloth lightly dipped in distilled water to remove smudges and fingerprints. Never use tap water the minerals in the water can damage your screen and leave a white residue that won t appear right away. Also, be careful not to press hard on the screen surface, and be sure to wipe in only one direction; simply wipe and let the water do the work. Oh, and it s easier to see smudges when the netbook is turned off. If you re as proud of your little netbook as I am of mine, give the screen an occasional cleaning nothing is more embarrassing than having someone borrow your netbook to check email or sport scores and complain about the smears and smudges.

Owner: the account under which Clusterware/Grid Infrastructure was installed Group: oinstall Permissions: 0640

Figure 4-36. Click Change Scope to change the scope for the Windows Home Server Computer Backup program.

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How you should set the permissions and user/group attributes depends on how you defined the devices in the first place. That said, the most commonly used scripts to do this are udev or the /etc/rc.local scripts. Clusters configured to use GNS will not start completely until communication with the DHCP and DNS servers is established. A good first indication of the status of the cluster node is the output from the crsctl check crs command. Typically, you define your troubleshooting strategy based on its output. The following output shows what the command should return for a healthy cluster node: [oracle@london1 ~]$ $GRID_HOME/crsctl check crs CRS-4638: Oracle High Availability Services is online CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online Several possible problems can be reported at this stage, including the following: CRS-4639: Could not contact Oracle High Availability Services CRS-4535: Cannot communicate with Cluster Ready Services CRS-4530: Communications failure contacting Cluster Synchronization Services daemon CRS-4534: Cannot communicate with Event Manager

Systematic troubleshooting of Grid Infrastructure follows a bottom-up approach because the resources have clearly defined dependencies (please refer to the Startup Sequence section for more information about the starting Grid Infrastructure in general). The generic troubleshooting document Oracle provides to resolve such issue is My Oracle Support note 1050908.1 How to Troubleshoot Grid Infrastructure Startup Issues ; the following sections are loosely modeled on that support note.

The first daemon to start in a Grid Infrastructure environment is OHAS. This process relies on the init process to invoke /etc/init.d/init.ohasd, which starts /etc/rc.d/init.d/ohasd, which in turn executes $GRID_HOME/ohasd.bin. Without a properly working ohasd.bin process, none of the other stack components will start. The entry in /etc/inittab defines that /etc/init.d/init.ohasd is started at runlevels 3 and 5. Runlevel 3 in Linux usually brings the system up in networked, multi-user mode; however, it doesn t start X11. Runlevel 5 is normally used for the same purpose, but it also starts the graphical user interface. If the system is at a runlevel other than 3 or 5, then ohasd.bin cannot be started, and you need to use a call to init to change the runlevel to either 3 or 5. You can check /var/log/messages for output from the scripts under /etc/rc.d/init.d/; ohasd.bin logs information into the default log file destination at $GRID_HOME/log/hostname in the ohasd/ohasd.log subdirectory. The administrator has the option to disable the start of the High Availability Services stack by calling crsctl disable crs. This call updates a flag in /etc/oracle/scls_scr/hostname/root/ohasdstr. The file

6. For each service, click the Change Scope button to launch the Change Scope dialog box, shown in Figure 4-38.

contains only one word, either enable or disable, and no carriage return If set to disable, then /etc/rcd/initd/ohasd will not proceed with the startup Call crsctl start crs to start the cluster stack manually in that case Many Grid Infrastructure background processes rely on sockets created in /var/tmp/oracle You can check which socket is used by a process by listing the contents of the /proc/pid/fd directory, where pid is the process id of the program you are looking at In some cases, permissions on the sockets can become garbled; in our experience, moving the oracle directory to a safe location and rebooting solved the cluster communication problems Another reason ohasdbin might fail to start: the file system for $GRID_HOME could be either corrupt or otherwise not mounted Earlier, it was noted that ohasdbin lives in $GRID_HOME/bin.

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