Enhanced Scalability Installation and Administration Guide – SC 6. Press Enter. The system adds these values to the HACMP for AIX ODM and. Product Guide, P/N HACMP for AIX Administration Guide, HACMP for AIX Geographic LVM: Planning and Administration Guide. Selection from Guide to IBM PowerHA SystemMirror for AIX Version [Book] PowerHA SystemMirror · Rolling migration from PowerHA SystemMirror to PowerHA SystemMirror (AIX TL3 or Administration.
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There are a number of possible causes: These simultaneous mount events can also cause a system crash, when the system detects a conflict between data or metadata in the filesystem and the in-memory state of the filesystem.
Per cluster you can see: Using the IP addresses of a guife and the snmpinfo command, you can remotely retrieve cluster status information, and use that information to build a webpage.
Also, the format of the log file is easy to read and identify important information. Then discover the newly added storage by running the cfgmgr command on one of the nodes: Finally, the major number should be set in 6. example below: Now, this may differ for the type of storage used so please make sure to check your storage vendor’s recommendations on this topicbut a good starting point is for example, for disk hdisk4: Hacp may schedule this command through cron to get a regular up to date version.
In AIX and a new feature called “Mount Guard” has been added to prevent simultaneous or concurrent mounts. For that purpose, run the following command on all cluster nodes, administrattion lists the available major numbers: You can download it here: When a filesystem is protected against concurrent mounting, and a second mount administratoon is made you will see this error: Clstat is rather slow with its updates, and sometimes the required clinfo deamon needs restarting in order to get it operational, so this is, well, not perfect.
Guide to IBM PowerHA SystemMirror for AIX Version 7.1.3
Now run “lspv” on both nodes of the cluster, and look at the PVIDs listed. Operation is not allowed because vg is a RAID concurrent volume group.
First, verify that the cluster is in a good state by running: These attributes are stored in the ODM of the AIX system locally, xdministration don’t automatically transfer over to other nodes of the cluster, so you’ll have to set these attributes for all new disks on all cluster nodes. Oracle will log an ORA error when it shuts down the instance due to inconsistent timers.
In the case of SAN storage, please ensure that your storage administrator adds the storage to both nodes of the cluster. The first thing that we’ll need to know is a common majar number that is available on both nodes of a cluster.
To turn off mount guard: The behavior is configured with the -x flag for the xntpd daemon. Mount guard override for filesystem.
The only exception to this is mounting the filesystem read-only, where files or directories can’t be changed. The next step is to create the new volume group s.
Search and compare log files. Then create a file system on the previously defined logical volume: The same option is used with crfs when creating a filesystem. If the time on the reference adminisrtation is behind the time of the system clock, the system clock will be set backwards causing the same time period to be passed twice.
The filesystem is potentially mounted on another node. This is version 9. Do make sure to select guidw correct PVID of one of the disks in the volume group on the first node when importing this volume group on the second node, as you’ll want to make sure both nodes of a PowerHA cluster use the same volume group names. If you run into the following error: Monitor the status for all clusters, sites, nodes, and resource groups in your environment. Commands clstat or cldump will not start if the internet MIB tree is not enabled in snmpdv3.
And when you run “lspv” on the second node after running cfgmgr, you’ll notice that the PVID is already set for all the discovered disks it was set on the first node. The filesystem is potentially mounted on another node After a system crash the filesystem may still have mount flags enabled and refuse to be mounted. In PowerHA version 7.
Guide to IBM PowerHA SystemMirror for AIX Version [Book]
View properties for a cluster such as the PowerHA SystemMirror version, name of sites and nodes, and repository disk information. There are no external admimistration, and it is included is the base PowerHA product. You axministration create additional volume groups, logical volumes and file systems as it pertains to your situation. Next, log in to the other node, and run the cfgmgr command on that node admministration well, so the disks will be discovered on the other node as well.
After enabling the MIB entry above snmp daemon must be restarted with the following commands as shown below: In its default configuration, NTP will periodically update the system time to match a reference clock by resetting the system time on the node.
To check the current running configuration of xntpd for the -x flag: To avoid this issue, system managers should configure the NTP daemon to increment time on the node admihistration until the system clock and the reference clock are in sync this is called “slewing” the clock instead of resetting the time in one large increment. You can download the script here.
UNIX Health Check – PowerHA / HACMP
At this point, the volume group, logical volume and file system have been created. For PowerHA, a new volume group should be configured as concurrent-capable configured by the -C option of the mkvg command. Adminisfration still doesn’t provide an overview in a single look, as the clstat. This may be caused by the volume group being varied on, on the other node. PowerHA version 7 starting with version 7.