Date: Sat, 02 Aug 2014 18:33:38 -0400 From: Daniel Staal <DStaal@usa.net> To: freebsd-questions@freebsd.org Subject: Re: gvinum raid5 vs. ZFS raidz Message-ID: <2D72AC9FF5B82553FEF7D3EB@[192.168.1.50]> In-Reply-To: <201408020621.s726LsiA024208@sdf.org> References: <201408020621.s726LsiA024208@sdf.org>
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--As of August 2, 2014 1:21:54 AM -0500, Scott Bennett is alleged to have said: >>> Does not support migration to any other Does not support migration >>> RAID levels or their equivalents. between raidz levels, even by >> >> Correct. Once you have created a vdev, that vdev must remain the same >> type. You can add mirrors to a mirror vdev, but you cannot add drives or >> change raid level to raidz1, raidz2, or raidz3 vdevs. > > Too bad. Increasing the raidz level ought to be not much more > difficult than growing the raidz device by adding more spindles. Doing > the latter ought to be no more difficult that doing it with gvinum's > stripe or raid5 devices. Perhaps the ZFS developers will eventually > implement these capabilities. (A side thought: gstripe and graid3 > devices ought also to be expandable in this manner, although the resulting > number of graid3 components would still need to be 2^n + 1.) --As for the rest, it is mine. There actually is a semi-simple way, even if it's not direct... You can 'send' a ZFS filesystem to a backup drive, and then 'receive' it back to a new pool. It will keep all file and volume level options when you do that, but the pools can be set up differently. It's not something you can do in-place, but it's not hard either. (Basically, it's a simplified 'backup and restore to new setup', but it is majorly simplified.) Daniel T. Staal --------------------------------------------------------------- This email copyright the author. Unless otherwise noted, you are expressly allowed to retransmit, quote, or otherwise use the contents for non-commercial purposes. This copyright will expire 5 years after the author's death, or in 30 years, whichever is longer, unless such a period is in excess of local copyright law. ---------------------------------------------------------------
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