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Date: Tue, 13 Apr 2010 16:06:41 -0500 From: Larkin Lowrey <llowrey@...learwinter.com> To: tytso@....edu CC: linux-ext4@...r.kernel.org Subject: Re: Q wrt LVM snapshot of ext4 w/ external journal On 4/13/2010 2:22 PM, tytso@....edu wrote: > It's safe to mount the LVM2 snapshot only if you use the mount option > noload. This will prevent it from using the journal, which is good, > since the journal is in use by the original file system. :-) > > I was able to verify that mounting with noload worked as advertised. Thank you. The exact message was "mounted filesystem without journal". > Hopefully, mounting the snapshot without using noload _should_ fail, > since the journal is already in use, but I'm not sure we have that > check in place, so I don't recommend trying it on a production file > system. I also verified that mounting w/o noload causes the mount operation to fail. The message was "failed to claim external journal device". When I unmounted the original fs so that the journal device was not in use and then tried to mount the snapshot w/o noload, the mounted snapshot was able to claim the journal. Of course I would never do that on purpose but I wanted to see what would happen. I believe this falls under the "don't do that or bad things will happen" category. Thank you very much for your response to my query. --Larkin -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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