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Date:      Wed, 2 May 2012 16:05:01 -0500
From:      Mark Felder <feld@feld.me>
To:        freebsd-fs@freebsd.org
Subject:   Re: Replacing dead drives in ZRAID2
Message-ID:  <op.wdo8unq834t2sn@tech304>
In-Reply-To: <20120501210429.D4F6910657EB@hub.freebsd.org>
References:  <20120501210429.D4F6910657EB@hub.freebsd.org>

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First of all, you're testing on decade old SCSI hardware that probably  
hasn't seen any serious use on a newer FreeBSD install in a very, very  
long time.

Secondly, I'm confused about the concept of a "3 drive RAIDZ2". How is  
that even possible? Two drives have to be parity, so the last drive is...  
the entire dataset? Why aren't you just doing a 3-way mirror?

And finally yes, you can just yank drives in a ZFS array to simulate a  
failure. After reinsertion you have to manually add them back to the pool,  
but it certainly works.



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