[zfs-discuss] Need to clear my understanding with ZFS snapshot. please help.

Lindsay Mathieson lindsay.mathieson at gmail.com
Fri Dec 4 16:20:12 EST 2015



On 5/12/2015 1:07 AM, Muhammad Yousuf Khan via zfs-discuss wrote:
> anyways. once the snapshot is completed i deleted the 3GB files that i 
> place for testing. and ran the rollback command to bring back my VM 
> state which has the 3GB files. which is technically tank/vm at 3g. the 
> snapshot rolledback succesfully however when i restart the VM. nothing 
> happend. the data is still missing. 


Snapshotting live machines is going to be unpredictable -there's 
typically a lot of caching going on and data might not yet be written to 
disk.

I'd suggest testing the following:

 1. Stop the VM
 2. Snapshot it
 3. Start the VM
 4. Copy your 3GB file to the VM
 5. Stop the VM
 6. Snapshot it.


Now do your comparisons.


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