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Date:      Sat, 11 May 2013 09:23:04 -0400
From:      Paul Kraus <paul@kraus-haus.org>
To:        "Vladislav Prodan" <universite@ukr.net>
Cc:        freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-questions@freebsd.org
Subject:   Re: Tell me how to increase the virtual disk with ZFS?
Message-ID:  <5C2B4C2B-BAF2-49C1-8554-319EB5FE6C3B@kraus-haus.org>
In-Reply-To: <43529.1368277152.10278121996412321792@ffe11.ukr.net>
References:  <43529.1368277152.10278121996412321792@ffe11.ukr.net>

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On May 11, 2013, at 8:59 AM, "Vladislav Prodan" <universite@ukr.net> =
wrote:

> Add another virtual disk and do a RAID0 - not an option. It is not =
clear how to distribute the data from the old virtual disk to the new =
virtual disk.

When you add an additional "disk" to a zpool (to create a STRIPE), the =
ZFS code automatically stripes new writes across all top level vdevs =
(drinks in this case). You will see a performance penalty until the data =
distribution evens out. One way to force that (if you do NOT have =
snapshots) is to just copy everything. The new copy will be striped =
across all top level vdevs.

The other option would be to add an additional disk that is as large as =
you want to the VM, attach it to the zpool as a mirror. The mirror vdev =
will only be as large as the original device, but once the mirror =
completes resilvering, you can remove the old device and grow the =
remaining device to full size (it may do that anyway based on the =
setting of the auto expand property of the zpool. The default under 9.1 =
is NOT to autoexpand:

root@FreeBSD2:/root # zpool get autoexpand rootpool
NAME      PROPERTY    VALUE   SOURCE
rootpool  autoexpand  off     default
root@FreeBSD2:/root #=20

--
Paul Kraus
Deputy Technical Director, LoneStarCon 3
Sound Coordinator, Schenectady Light Opera Company




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