Removing Snapshot sub tasks
Greetings, When removing a snapshot, why does the following sub task is executed: - Merging snapshot of disk DiskNname ? Attached a screenshot of the tasks executed. I'm just wondering why there is a need to perform merge ? Thanks, Mohyedeen
------=_Part_10919963_1250013459.1401004348628 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi, I'll try to explain - I hope that I'll get it right :) Lets say that you have a vm with one disk, and you create a snapshot - what it actually does is creating another disk and start writing to it from this point. Now lets say that you create another snapshot now - again, it'll create another disk and start writing to it. Now if you want to remove the first snapshot, you need to merge the information that was written on this snapshot, so you won't loose data in the second snapshot. ----- Original Message ----- > From: "Mohyedeen Nazzal" <mohyedeen.nazzal@gmail.com> > To: Users@ovirt.org > Sent: Sunday, May 25, 2014 9:40:57 AM > Subject: [ovirt-users] Removing Snapshot sub tasks > Greetings, > When removing a snapshot, why does the following sub task is executed: > * Merging snapshot of disk DiskNname ? > Attached a screenshot of the tasks executed. > I'm just wondering why there is a need to perform merge ? > Thanks, > Mohyedeen > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users ------=_Part_10919963_1250013459.1401004348628 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"font-family: times new roman, new york, times, se= rif; font-size: 12pt; color: #000000"><div>Hi,</div><div><br></div><div>I'l= l try to explain - I hope that I'll get it right :)<br></div><div><br></div= ><div>Lets say that you have a vm with one disk, and you create a snapshot = - what it actually does is creating another disk and start writing to it fr= om this point. Now lets say that you create another snapshot now - again, i= t'll create another disk and start writing to it.<br></div><div>Now if you = want to remove the first snapshot, you need to merge the information that w= as written on this snapshot, so you won't loose data in the second snapshot= .<br></div><div><br></div><div><br></div><hr id=3D"zwchr"><blockquote style= =3D"border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#0= 00;font-weight:normal;font-style:normal;text-decoration:none;font-family:He= lvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Mohyedeen Nazzal" &= lt;mohyedeen.nazzal@gmail.com><br><b>To: </b>Users@ovirt.org<br><b>Sent:= </b>Sunday, May 25, 2014 9:40:57 AM<br><b>Subject: </b>[ovirt-users] Remov= ing Snapshot sub tasks<br><div><br></div><div dir=3D"ltr"><div>Greetings,&n= bsp;</div>When removing a snapshot, why does the following sub task is exec= uted: <div><ul><li>Merging snapshot of disk DiskNname ?<br></li></ul><= div>Attached a screenshot of the tasks executed. </div> <div><br></div><div>I'm just wondering why there is a need to perform merge= ? </div><div><br></div><div><br></div><div>Thanks, </div><div>M= ohyedeen</div><div><br></div></div></div> <br>_______________________________________________<br>Users mailing list<b= r>Users@ovirt.org<br>http://lists.ovirt.org/mailman/listinfo/users<br></blo= ckquote><div><br></div></div></body></html> ------=_Part_10919963_1250013459.1401004348628--
Thanks Meital, It seems reasonable now. Thanks again. On Sun, May 25, 2014 at 10:52 AM, Meital Bourvine <mbourvin@redhat.com>wrote:
Hi,
I'll try to explain - I hope that I'll get it right :)
Lets say that you have a vm with one disk, and you create a snapshot - what it actually does is creating another disk and start writing to it from this point. Now lets say that you create another snapshot now - again, it'll create another disk and start writing to it. Now if you want to remove the first snapshot, you need to merge the information that was written on this snapshot, so you won't loose data in the second snapshot.
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*From: *"Mohyedeen Nazzal" <mohyedeen.nazzal@gmail.com> *To: *Users@ovirt.org *Sent: *Sunday, May 25, 2014 9:40:57 AM *Subject: *[ovirt-users] Removing Snapshot sub tasks
Greetings, When removing a snapshot, why does the following sub task is executed:
- Merging snapshot of disk DiskNname ?
Attached a screenshot of the tasks executed.
I'm just wondering why there is a need to perform merge ?
Thanks, Mohyedeen
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Mohyedeen Nazzal