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Operating Systems AIX logical volume partially mirrored Post 302206620 by bakunin on Wednesday 18th of June 2008 05:53:58 AM
Old 06-18-2008
The paging space (at least one paging space) should remain on rootvg, as this is the volume group activated and mounted first on boot time. The machine needs to hve access to at least one paging space during boot.

You could delete the other swapspaces and create them anew on some SAN disk. Notice that all swap spaces should be of equal size: AIX uses them in a round-robin-schema. If you want to make the swap faster create more swapspaces and put all but one of them on the SAN storage. Do NOT create one big swap on the SAN and a small one in the rootvg, as is oftenly seen.

If the Websphere LV should be on rootvg or not is a matter of taste: some claim, that binaries should go along with the OS and only data should be on SAN storage. Others claim that binaries should reside with the data they work on.

In your case it is still not clear where the error comes from, as aside from the error everything looks normal. Maybe the error report (issue "errpt" and "errpt -a" respectively) might tell you something.

If you can, back up the LV, delete it and create it anew, then restore the data. Another possibility would be to backup the LV, create a new LV somewhere else, restore the data to it, then umount the original and mount the new one - takes 1 minute and an application restart.

Don't care if this is a production machine when proposing a downtime: if the management of the data center hasn't provided for some maintenance downtime then the management has made a GRAVE CONCEPTUAL error - it is well known that machines do not run for an infinite time - period. So it is their fault, not yours. You are just pointing it out. They may wince and they may whine, but in the end you'll get your downtime.

bakunin
 

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info(4) 						     Kernel Interfaces Manual							   info(4)

NAME
info - diskless client configuration information file DESCRIPTION
The file is a POSIX shell sourceable file which contains parameter definitions used at boot time. Typically, it will be an empty file and default values will be used for all parameters. Following is the list of parameters which can be defined in the file: Specifies the IP address of the client's private root server. If this is not specified, the client's private root server defaults to the boot server. Specifies the pathname to the client's private root on the private root server. If this is not specified, the client's private root path defaults to Specifies the NFS mount options to mount the client's private root from the private root server. If this is not specified, the mount options default to Specifies the NFS mount options to mount the client's directory from the boot server. If this is not specified, the mount options default to Specifies whether NFS should be configured as primary swap. (NOTE: In order to swap to NFS, a diskless kernel must be configured with tunable parameter set to 1.) If a diskless machine has a local swap disk and swap to NFS is not desired, the parameter should be set to the value of 1 and the diskless kernel should be configured without setting to 1. If this parameter is not specified in the file and the kernel tunable parameter is set to 1, then NFS will be configured as primary swap. If not set, this parameter defaults to a value of 1, and results in the removal of all swapfiles above the configured swap minimum (swap is specified in the client's when a disk- less client boots. This ensures that extraneous swapfiles at boot time are removed, thus freeing disk space. If is set to 0 in the file, removal of extra swapfiles is disabled. This may result in faster boot times due to the time savings in creating additional swap files. The file resides in the same directory as the client's kernel () on the boot server and is retrieved at boot time using command. By default, when a diskless client is created, an empty file is placed in the client's kernel directory. This ensures that all parameters revert to their default values (see above). If the file is not present, this is an error. EXAMPLES
An example file is shown below: FILES
info(4)
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