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Date:      Mon, 1 Jun 2009 13:19:54 +0100
From:      krad <kraduk@googlemail.com>
To:        "'Wojciech Puchar'" <wojtek@wojtek.tensor.gdynia.pl>, "'krad'" <kraduk@googlemail.com>
Cc:        freebsd-hackers@freebsd.org, 'Mike Meyer' <mwm-keyword-freebsdhackers2.e313df@mired.org>, xorquewasp@googlemail.com
Subject:   RE: Request for opinions - gvinum or ccd?
Message-ID:  <3ED3189838484C8FBDECE5478A0DDFF4@uk.tiscali.intl>
In-Reply-To: <alpine.BSF.2.00.0906011103160.29890@wojtek.tensor.gdynia.pl>
References:  <20090530175239.GA25604@logik.internal.network><20090530144354.2255f722@bhuda.mired.org><20090530191840.GA68514@logik.internal.network><20090530162744.5d77e9d1@bhuda.mired.org><A5BB2D2B836A4438B1B7BD8420FCC6A3@uk.tiscali.intl><20090531201445.GA82420@logik.internal.network><alpine.BSF.2.00.0905312355240.26545@wojtek.tensor.gdynia.pl><0229B3BF1BE94C82AA11FD06CBE0BDEF@uk.tiscali.intl><20090531235943.GA77374@logik.internal.network><20090531201408.45dd4334@bhuda.mired.org> <alpine.BSF.2.00.0906010224050.27329@wojtek.tensor.gdynia.pl> <442651299CA2445991E65F64AF9E65D7@uk.tiscali.intl> <alpine.BSF.2.00.0906011103160.29890@wojtek.tensor.gdynia.pl>

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Its all done on write, so if you update the file it will have multiple
copies again

This explains it quite well

http://blogs.sun.com/relling/entry/zfs_copies_and_data_protection

-----Original Message-----
From: Wojciech Puchar [mailto:wojtek@wojtek.tensor.gdynia.pl] 
Sent: 01 June 2009 10:05
To: krad
Cc: 'Mike Meyer'; freebsd-hackers@freebsd.org; xorquewasp@googlemail.com
Subject: RE: Request for opinions - gvinum or ccd?

> You shouldn't need to alter the copies attribute to recover from disk
> failures as the normal raid should take care of that. What the copies is

I don't think we understand each other. I say that when i want 2 copies, 
ZFS should rebuild second copy if it's gone and i run resilver.

it does not, what doesn't make sense for me.





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