I would only do this on a clean install (and these directions are for that). The order of these steps is important to avoid corruption. The concept behind this procedure and “work around” is that instead of mirroring the entire disk, you use gmirror to mirror each of your partitions. Note: Instructions on rebuiling a gmirror with this kind of setup are at the bottom under Testing & Replacing A Failed Disk. This is because both GEOM (the provider for gmirror) and GPT write meta data at the end of the disk. īy default gmirror and the GPT partitioning scheme do not get along. Note: These instructions have been verified to work for FreeBSD 9.1, FreeBSD 9.2, FreeBSD 10.0, FreeBSD 10.1, and FreeBSD 11.0. Really anything between FreeBSD 9 and 11 should work.Īpril 30th, 2015: This article is really popular, I’ll do my best to keep it up to date! I’ve added notes about TRIM, alignment and GMIRROR (-h) labeling since it was originally posted. Last Updated November 14th, 2016: Updated to include that this works under FreeBSD 11.0 as well.
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