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Full Discussion: FileSystems under HACMP
Operating Systems AIX FileSystems under HACMP Post 303008060 by bakunin on Sunday 26th of November 2017 05:57:55 PM
Old 11-26-2017
Quote:
Originally Posted by LoLo92
Actually, in my low-budget Customer environnement, this very HACMP cluster is only configured and used when needed
What do you mean by that? The whole point of a cluster is high-availability. If one of the nodes break the application still runs. If you know in advance when your node breaks you don't a cluster at all (although i don't believe such astute foretelling skills exist).

Quote:
Originally Posted by LoLo92
that's why boths nodes are UNMANAGED for instance.
I don't understand this. "nodes" are the systems taking part in the cluster. They cannot be "unmanaged". They can only have their cluster services started ("joined the cluster") or not.

"Unmanaged" is a state only a resource group can be in.

Quote:
Originally Posted by LoLo92
And what risks you mentioned above could happended when using LVM commands instead of CSPOC ones ?
I thought i described that in pretty detail: you have a cluster for the situations where something has (quite drastically) gone wrong. To make it possible that filesystems, volumes, etc. are taken over safely and started on the other node they share the information about how these FSes, LVs, etc. are built and in which state exactly they are right now. If you make changes to a LV (like increasing its size, etc.) and use normal LVM commands this information will not be propagated to the other nodes because these commands are not cluster-aware. If you use the respective CSPOC commands which indeed are cluster-aware they will do the same as the normal LVM commands but also use the clusters communication services (RSCT) to propagate this changed information to the other nodes immediately.

Again, you can get away with using "learning imports" on the other nodes to make the information consistent again, but why not just use the cluster commands, which do that automatically?

I hope this helps.

bakunin
 

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cmscancl(1m)															      cmscancl(1m)

NAME
cmscancl - gather system configuration information from nodes with Serviceguard installed. SYNOPSIS
cmscancl [-n node_name]... [-s|-o output_file] DESCRIPTION
cmscancl is a configuration report and diagnostic tool intended only for use by HP Support Personnel. It gathers system software and hard- ware configuration information from a list of nodes, or from all the nodes in a cluster. The information that this command displays includes LAN device configuration, network status and interfaces, file systems, LVM configuration, link-level connectivity (HPUX only), IPv4/IPv6 connectivity, and the data from the binary cluster configuration file. This command can be used as a troubleshooting tool or as a data collection tool. This command is a Perl script which gathers system configuration information by executing various OS commands or tools. It uses the cmexec command to gather information from remote nodes. The -n option can be used to specify a list of nodes to be scanned, the nodes to be scanned do not need to be a member of a cluster. If the -n option is not specified, it will scan all the nodes in the local cluster. By default, the output of this command will go to the file /tmp/scancl.out. If the file /tmp/scancl.out already exists, the old file will be saved in /tmp/scancl.out.old. The -o option can be used to redirect output to a specified output file. If the -o option is not specified, output will go to the default output file /tmp/scancl.out. The -s option can be used to direct all output to the screen, instead of to an output file. Options cmscancl supports the following options: -n node_name... Specify the node(s) to be scanned. If this option is not specified and there is a cluster configured, all the nodes in the cluster will be scanned. If this option is not specified and there is no cluster configured, only the local node will be scanned. -o output_file Write configuration information to a specified output file. If this option is not specified, the information will be directed to stdout. -s Display the configuration information to the screen only. This option cannot be used in conjunction with the -o option. The output from this command contains the following information: LAN device configuration (On HP-UX, output from lanscan; On Linux, output from ifconfig) network status and interfaces (output from netstat) file systems (output from mount) LVM configuration (contents of /etc/lvmtab file) LVM physical vg information (contents of /etc/lvmpvg file) link-level connectivity (HP-UX only) (output from linkloop) IPv4/IPv6 connectivity (results from ping (and ping6 on Linux)) binary configuration file data (output from cmviewconf) RETURN VALUE
cmscancl returns the following value: 0 Successful completion. 1 Command failed. EXAMPLES
To gather the configuration information from node1 and node2 and to save the output in file /tmp/scancl.log: cmscancl -n node1 -n node2 -o /tmp/myscancl.log To gather the configuration information from all the nodes in the cluster and save the output to the file: /tmp/scancl.log: cmscancl -o /tmp/myscancl.log To gather the configuration information from all the nodes in the cluster and display the output on the screen: cmscancl -s To gather the configuration information from all the nodes in the cluster and save the output to the file /tmp/scancl.out: cmscancl AUTHOR
cmscancl was developed by HP. SEE ALSO
Linux: cmviewcl(1), mount(8), netstat(8), ping(8), ping6(8) HP-UX: cmviewcl(1m), lanscan(1m), linkloop(1m), mount(1m), netstat(1), ping(1m) Requires Optional Serviceguard Software cmscancl(1m)
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