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 ยท Rolling migration from PowerHA SystemMirror to PowerHA SystemMirror (AIX TL3 or Administration.

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You’re probably familiar with the clstat or the xclstat commands. Do make sure to select the correct PVID of one of adminisrtation 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.

Cannot mount guarded filesystem. The same option is used with crfs when creating a filesystem.

There’s a script which is also easy to use. For example, for disk hdisk77, run: Search and compare log files.

At this time, the storage is properly configured on both nodes, and it is time to add the volume group s to the PowerHA resource group. Also, the format of the log file is easy to read and identify important information. The first thing that we’ll need to know is a common majar number that is available on both nodes of a cluster.

It will also show you where any resource groups are active. Next, log in to the other node, and run the cfgmgr command on that node as well, so the disks will be discovered on the other node as well.

While PowerHA can give concurrent access of volume groups to multiple systems, mounting a JFS2 filesystem on multiple nodes simultaneously will cause filesystem corruption.


These attributes are stored in the ODM of the AIX system locally, and 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.

Guide to IBM PowerHA SystemMirror for AIX Version 7.1.3

Then discover the newly added storage by running the cfgmgr command on one of the nodes: There are a number of possible causes: If the event occurred because of an error or issue in your environment, you can read suggested solutions administratoon fix the problem. Operation is not allowed because vg is a RAID concurrent volume group.

When a filesystem is protected against concurrent mounting, and a second mount attempt is made you will see this error: Now run “lspv” on both nodes of the cluster, and look at the PVIDs listed. For the latest version, check www.

To determine the mount guard state of a filesystem: Finally, the major number should be set in the example below: This is version 9. In AIX and a guied feature called “Mount Guard” has been added to prevent simultaneous or concurrent mounts. Failed retrieving cluster information.

If a filesystem appears to arministration mounted on another server, and the feature is enabled, AIX will prevent mounting on any other server. In its default configuration, NTP will periodically update the system time to match a reference clock by resetting the system time on the node. In this case the guard state can be temporarily overridden by the “noguard” option to the mount command: To check the current running configuration of xntpd for the -x flag: Clstat haacmp rather slow with its updates, and sometimes the required clinfo deamon needs restarting in jacmp to get it operational, so this is, well, not perfect.

First, verify that the cluster is in a good state by running: If the time on the reference clock 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 After a system crash the filesystem may still have mount flags enabled and refuse to be mounted.

UNIX Health Check – PowerHA / HACMP

These simultaneous mount events can also cause a system crash, when the admjnistration detects a conflict between data or metadata in the filesystem and the in-memory state of the filesystem. You can download the script here. There are two ways to enable this MIB sub tree riscclsmuxpd. This may be caused by the volume group being varied on, on the other node. If it continues to be a problem, then stop HACMP on both nodes, export the volume group and re-import the volume group on both nodes, and then restart the cluster.

This article describes how to adninistration a new volume group to an existing resource group of an active PowerHA cluster.

The behavior is configured with the -x flag for the xntpd daemon. 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 guire point is for example, for disk hdisk4: This can be done while the cluster is up and running: PowerHA version 7 starting with version 7.

Commands clstat or cldump will not start if the internet MIB tree is not enabled in snmpdv3. On both adminitration, make sure that the disk attributes are set correctly. The command needed to generate the report is clmgr.

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