Hi Mrinal-Kiosk,  This is the EMC VSS (Volume Shadow copy Services) that is taking the snapshot. Let me explain. When there is a request to take a backup, the BE uses EMC VSS provider to talk to the storage server to take a snapshot of the lun being backed up. This snapshot is used as a source to backup the data. The data from snapshot is more consistent than a lun that is continuously being updated. Again, the user doesn't have to worry about deleting this snapshot, because the backup application (here BE) will delete the snapshot it created after the backup job is completed. This snapshot is not different from any other user created snapshot in terms of protection space and hence we need to provision protection space to make space for these snaps.  Hope that helps.
Hi, I am very much new for this support forum so treat me a tranniee. We have the bollowing details:- 1. VNXe 3100 (Dual SP). 2. Symantec Backup Exe 2012. 3. Hyper-V server (Win 2008 R2) where VMs were mounted on to the LUN. 4. All VMs were mounted on to the iSCSI drive (5 LUN) and the BE 2012 is taking these VMs backup from the Hyper-V server. 5. Protection is not enabled for the iSCSI LUN dur to the space issue.  Now, few days ago our SPB went down. Called the EMC support and they identified that the SPB was down due to the following:- 1 Noticed the DART 3 was freeze. 2 Panicked the DART 3 and dumps were collected.  3 Restarted DART it came up fine. 4 Checked LUN 1 on SPB was 100% full. Protection specified was 0 from GUI but there was a snapshot in the backend which was promoted. 5 Customer informed that he was using Symantec to take a backup and snapshot option was enabled. Probably it talked to DART directly and snapshot was created.  Informed him he needs to either specify protection     space 105% of lun size or not take snapshots at all. 6 Demoted the snapshot and deleted it from cli.  So, now my question are:- 1. Is there any linkage of Backup with the snapshot protection of EMC. 2. We have'nt enabled the snapshot for taking the VMs backup but how come the snap is being created.  Am I missing some things or the EMC is missied confiured.
Snapshot creation for VNXe 3100