On Jun 21, 2013, at 2:58 PM, Joseph L. Casale wrote:

>> So I have an XFS file system within LVM  which has an external log.
> 
>> A snapshot volume is created w/o issue;
> 
>> But when i try to mount the file system;
>> mount: /dev/mapper/vg_spock_data-datasnapshot already mounted or /snapshot 
>> busy
> 
> So the filesystem was built requiring an external log device?
> Let me guess, the original block device is still mounted and accessing its 
> log device?

Based on some superb feed back from the XFS list, I have decided to place the 
log on an LVM rather then raw device that its on now and then freeze both and 
run the snapshot.

I'll first move the log to a diff device and convert sdc1 to LVM, move the log 
back and then snap away.

Word is that as of Centos 6.2, there is no need to use an external log due to 
this thing called delaylog.

However my env this server is being used for is very metadata intense, more so 
then normal.

Hence I do feel an external mirrored SSD log is the way to go.

- aurf


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