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Date: Wed, 6 Feb 2008 17:51:45 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Bogdan Culibrk <bc@default.co.yu>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Some ZFS experience
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>
> What happened:
> 1. Base system running on gmirror volume consisting of 4 mirrors booted
> up normally in degraded mode with 3 of 4 drives online.
> 2. /data powered by raidz1 zfs was showing 3 drives, 2 online and 1
> faulted. zfs list was showing that volume is unavailable due lack of
> spares.

you told about having raidz over 4 drives.
so while it reports 2 online and 1 faulted, not 3 online and 1 faulted?

> What was wrong when 3 drives were connected? Wasnt supposed to raidz1
> survive lack of 1 drive? Or I did something wrong there?

yes it should work normally. in case of raid-z - with just a bit slower 
speed according to ZFS theory.