Hi <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">Kazutaka,</span><br><div><br></div><div>I am doing the following ops. After rollback to a snapshot, I deleted the snapshot. I am wondering is this a valid operation? Or is there a potential losing data here?  </div>

<div>Thanks. I really appreciate your time. </div><div><div><br></div><div><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">$ collie vdi list</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

test         1  2.1 MB  4.0 MB  0.0 MB 2013-03-13 15:06   7c2b25     1</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)"><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

$collie vdi  snapshot -s test1-s1 test</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">$collie vdi  snapshot -s test1-s2 test</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

<br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">$collie vdi  tree</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

test---[2013-03-13 15:06]---[2013-03-14 10:29]---(you are here)</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)"><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

$vdi  rollback -s test1-s1 test</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)"><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

$collie vdi  tree</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)"><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

test---[2013-03-13 15:06]-+-[2013-03-14 10:29]</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">                          `-(you are here)</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

<br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">$collie vdi  delete -s test1-s1 test  （Is this a valid operation?）</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

<br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)"><br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

<br></div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">$collie vdi tree                (is this correct?)</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">

test---[2013-03-14 10:29]</div><div style="font-size:13px;color:rgb(34,34,34);font-family:arial,sans-serif;background-color:rgb(255,255,255)">test---(you are here)</div><div><br></div><div><br></div><div>Regards,</div><div>

Wenhao</div><div><br></div>-- <br>~_~</div>