Migration from the KQ Implementation

Steve Costaras stevecs at chaven.com
Tue May 3 18:09:54 EDT 2011


You can't downgrade once you have a pool created but you can create a pool with a lower version:

zpool create -o version=23 <pool>

basically what I do here for the same reasons so I can move it around for testing.





-----Original Message-----
From: Gordan Bobic [mailto:gordan.bobic at gmail.com]
Sent: Tuesday, May 3, 2011 04:09 PM
To: zfs-discuss at zfsonlinux.org
Subject: Re: Migration from the KQ Implementation

On 05/03/2011 09:58 PM, Brian Behlendorf wrote:> I'm in agreement with Gunnar, your compress+dedup crash sounds exactly> like the stack overrun described in issue 174 which has been fixed.>> https://github.com/behlendorf/zfs/issues/174>> Additionally, even if this does turn out to be a different issue which> still exists. I'm sure we can suggest a way to recover the pool without> resorting to recreating the pool from a backup.Indeed, I do recognize almost all of the functions in the trace on that issue, so I'm pretty certain that it is either the same bug or a very similar one. I'll try building the rc3 against my kernel (RHEL6 2.6.32) and see how it goes.I don't suppose there's a way to downgrade the pool version to v23 or v26 so I could fall back on the fuse implementation in an emergency?Thanks guys, I really appreciate it. :)Gordan
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