Date: Tue, 31 Aug 2010 18:20:09 -0700 From: Artem Belevich <fbsdlist@src.cx> To: fbsd@dannysplace.net Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: How is data written to a pool with multiple VDevs Message-ID: <AANLkTin6pXhP7Bsu9H8j3eO=Mkr%2Bo-vuCt0i6NhePo0s@mail.gmail.com> In-Reply-To: <4C7D9BF1.9010102@dannysplace.net> References: <4C7D9BF1.9010102@dannysplace.net>
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On Tue, Aug 31, 2010 at 5:18 PM, Danny Carroll <fbsd@dannysplace.net> wrote= : ... > My question is: =A0Since the data will initially be on only one of the > raidz vdevs, when I add the second one, will ZFS re-organise the data on > the whole pool to be efficient or will I end up with only new data being > striped. No, I believe ZFS will not reorganize the data that's already written. However, ZFS will make an attempt to spread the data across both vdev once both are available. > If that is the case then I will try and find a way to build the new > array fully on a temporary machine first before copying the data. I guess once you've added second vdev and provided that you have enough space left, you can try copying your dataset once again. New copy will be spread across both vdevs. --Artem
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