Cannot use filesystem while sending a snapshot

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Operating Systems Solaris Cannot use filesystem while sending a snapshot
# 1  
Old 08-21-2011
Cannot use filesystem while sending a snapshot

I've got a Solaris 11 Express installed on my machine. I have created a raidz2 zpool named shares and a simple one-disc zpool named backup. I have made a script that would send a daily snapshot of shares to backup.

I use these commands

zfs snapshot shares@DDMMRRRRHHMM
zfs send -i shares@.... shares@DDMMRRRRHHMM | zfs receive -F backup

It works quite fine, but for one important issue. If i make a change to the shares filesystem while sending the snapshot, the snapshot is not send properly.

I currently unmount the filesystem before and mount it back again after the transfer completes, but that is unfortunatelly an unacceptable situation.

Thanks in advance for all replys,
# 2  
Old 08-21-2011
What if you remount it read-only? It will still be available but shouldn't cause trouble for the snapshot.
# 3  
Old 08-21-2011
Thanks for your reply. There is an SVN repository on the filesystem that I might need to work with, so I'd prefer letting in mounted read/write if that's possible.
# 4  
Old 08-21-2011
Please elaborate about:
If i make a change to the shares filesystem while sending the snapshot, the snapshot is not send properly.
# 5  
Old 08-22-2011
Thanks for your reply.

Theoretically, there should be no reason for the snapshot beeing sent to get corrupted. Even though the represented filesystem has been modified, the snapshot still does have all the information about what it looked like before.

Moreover, been unable to modify the system while sending the snapshot (which might be for quite a long time if there are a lot of changes) is quite annoying. That's why I want to find out if there is a solution to that problem.
# 6  
Old 08-22-2011
It would help if you describe what the problem is in the first place, i.e. what makes you conclude the snapshot sent is corrupted.
# 7  
Old 08-23-2011
I used 400 GB of space on the shares filesystem, made an initial snapshot and sent it to the backup disk. Then I observed free space decreasing on the backup filesystem and thought myself "alright, that seems ok - the snapshot being send should probably take 400 GB of the backup filesystem's space after being sent completely".

But then I made a change to the svn repository (which resides on shares) and (even though the complete snapshot could not have been transfered completely at that time) after that, the "zfs list backup" command showed only a tiny space consumed on backup.

Moreover, when I tried to send another snapshot incrementaly (e.g. with the -i option), I got an error telling me that the opening snapshot did not match the most recent snapshot on the backup fs.

Though limited by my english language skills, I did my best to describe the situation. I hope this helps. Dusan
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