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Date:      Fri, 07 Jun 2013 19:18:45 +0300
From:      Volodymyr Kostyrko <>
To:        Quartz <>,  FreeBSD questions <>
Subject:   Re: ZFS: raid VS copies=n
Message-ID:  <>
In-Reply-To: <>
References:  <>

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07.06.2013 18:52, Quartz:
> 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).

copies=n tries to allocate blocks on different disks but doesn't 
guarantee this nor that any single disk can be used to retrieve data.

Sphinx of black quartz, judge my vow.

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