Date: Fri, 07 Jun 2013 11:52:52 -0400 From: Quartz <quartz@sneakertech.com> To: FreeBSD questions <freebsd-questions@freebsd.org> Subject: ZFS: raid VS copies=n Message-ID: <51B201D4.3000705@sneakertech.com>
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Question: How does the ZFS option 'copies=n' and raid relate to and interact with each other? specifically recovery in the event of a failure. For example, is having three disks in a raid-1 configuration with copies=1 effectively the same as having three disks in a raid-0 with copies=3? Are the copies distributed uniformly across all drives in the pool, or concentrated, or what? What happens with configs like a raid-z2 with copies=2? Which / how many disks can you lose? (I'm aware that like a lot of other ZFS options copies=n doesn't have to be global to the entire pool / directory structure, but for the sake of simplicity let's assume it is in this case). ______________________________________ it has a certain smooth-brained appeal
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