Automatically reduce to a single PV

I’ve been working with a client who is going through the process of migrating from physical Power 5 servers to a virtualized Power 7 environment with PowerVM. Often referred to as P2V migrations around the IBM office 😛 Due to the I/O limitations in the P5 servers, our only method of migration was to take mksysb/savevg’s of the current servers, create NIM resources out of them, and then restore onto the P7 LPAR’s.

The Power 5 rootvg consisted of two internal disks in a LVM mirror, with the other volume groups backed by either internal disk, or locally attached storage. The Power 7 which we were migrating to had it’s storage provided by a shiny DS8800. Given the boot from SAN solution we had, we no longer required two disks to form the rootvg, as all the mirroring and redundancy was being handled by the SVC’s.
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VIO: Virtual Media Library

The first LPAR that I normally build post VIOS installation is a NIM LPAR. Once you have your NIM server setup, building the rest of your LPAR’s becomes a much simpler task. However, what do you do when there isn’t an existing NIM environment, or you don’t have access to the physical servers to insert a disc to perform the AIX install? This is where the Virtual Media Library comes to the rescue. The Virtual Media Library is a feature of the Virtual I/O Server which allows you to present an ISO image to underlying LPAR’s. The best thing about the Virtual Media Library is that it’s very quick and simple to set up.
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