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Can someone please tell me how the image level proxies work? Do they take on the LUN mappings of the VM that their processing? I watch vCenter as the jobs kick off so I can try and figure out how they work. It looks like they consume the same amount of storage space as the VM they are backing up at the moment. With this in mind, I'm trying to figure out how much free space is needed per datastore.
If you have any other questions, let me know. I may not be asking this correctly.
Thanks in advance.
AlexAlmeida1
15 Posts
278
1
Posted October 24th, 2011 12:00
Sheila,
This could be the case, but you may be running out of space on the data stores where the snaps that are created for the backup actually live temporarily, rather than the datastores that contain the proxy VMs. It is all about where the snap is created and it is on the same datastore that the original VM lives on which may not necessarily be the same datastore the proxy VM lives on.
Hope this helps.
Thanks,
Alex
That makes sense completly. Thank you for the explaination. I think some of my issues are due to lack of free space on my datastores. Since I have 4 proxies running backups at the same time, I could be running in free space issues. 2 proxies run on a datastore with 283GB free and the other 1 run on a datastore with 460GB free. Most of my VM's are small but some are over 100GB to 745GB. Make sense?
AlexAlmeida1
15 Posts
278
0
Posted October 24th, 2011 12:00
Hi Sheila,
I am not sure what you mean when you state that the proxies "look like they consume the same amount of storage space as teh VM they are backing up at the moment." But I can say that the proxies mount the snaps of the VMs under backup via the VADP "SCSI-Hot Add" mechanism. So since the snapshot of the VM (which is used by the proxy to perform the backup is mounted, the total storage (on datastores) used by the proxy would include the virtual disk of the proxy plus the virtual disk snapshot from the production VM which is mounted for backup processing.
Does this make sense? As far as free space needed per datastore, this will depend on how much storage is temporarily needed at the time of backup to create a snap of the production VM images. But keep in mind, that the snap will only be taking up storage for as long as the VADP backup processing takes place. Once the backup is complete the snap will be torn down.
Hope this helps.
Thanks,
Alex