No gmirror in 9.0, now what?

The only "problem" with GPT and gmirror is that gmirror stores its metadata in the last sector. This conflicts with GPT's secondary header. Just define one gmirror per partition.
 

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Developer
michaelrmgreen said:
I was disappointed to discover that gmirror will be incompatible with 9.0 because of the introduction of gpt : http://www.freebsd.org/doc/handbook/geom-mirror.html

The procedure is the problem. GPT partitions can be mirrored: gmirror With Disk Partitions

This article has details of a work-around : http://blather.michaelwlucas.com/archives/1071

What are others, currently using gmirror, going to do?

Mirror the GPT partitions. If you want to mirror the whole drive, just create one GPT partition per drive and mirror those.
 
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