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Date: Tue, 05 Feb 2008 20:17:11 -0800
From: Drew Tomlinson <drew@mykitchentable.net>
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To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: Christian Baer <christian.baer@uni-dortmund.de>,
	freebsd-questions@freebsd.org
Subject: Re: Looking for a Text on ZFS
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Wojciech Puchar wrote:


[snip]

>>> mirror. that's all.
>>
>> Which doesn't really address the issue of what happens if a drive 
>> that is
>> part of a big ZFS is removed (because it's broken).
>
> it will say "read error" on all files and directories  that happened 
> to be placed on that disk!

Just to be clear, ZFS pools contain one or more VDEVs (Virtual 
devices).  Each VDEV consists of one or more physical partitions and can 
be configured as a mirror, stripe, stripe with one parity, or stripe 
with 2 parity.  ZFS does striping with no parity across all VDEVs in the 
pool.  Thus with ZFS, if you lose a VDEV, you lose the whole pool.

Hopefully that clears things up a bit.

Cheers,

Drew

[snip]