When I create a backup with Veeam Backup & Replication it takes extremely long time to perform the standard VMware remove snapshot task, it stucks several hours at 95%. When i use the snapmon script i see delta files round 5GB.
I've read a article about NFS in combination with CBT http://communities.vmware.com/message/1812898#1812898 , but that's solved with a ESXi patch http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=103110....
How is it possible that it take so much time to remove the delta files?
We've found that a very busy VM with lots of writes can outrun the snapshot delete process. Is your VM/app doing lots of writes? Can you quiesce it?
Do you get the same results doing a simple VMware snapshot without a Veeam backup task?
Hi!, whats your esx version? and build?.. delay is normal, according to the size of the VM and the number of snapshots .. One very important thing to consider is storage space available if it contains more than a snapshot. good practice is to have 20% free space in the datastore.
Any question tell me
King Regard
When i want to use the 20% rule for every virtual i've to create an extended VMFS datastore because the virtual disk is now 1,9TB.
Are there performance issues with extended datastores?
In our enviroment we're running ESXi 4.1 with the latest patches.
The server itself is a busy SAP database server, but when i look at IOPS utilyzation it goes about 2000 ~ 3000 IOPS for the complete enviroment on a HP Lefthand P4500G2 with 15k SAS storage.
If i do a manual create snapshot + removal it takes about the same time. In Veeam are all tasks completed with the backup in 10 minutes, only the removal takes enormous time.
the extend has a slight loss of performance .. must consider the RAID disk and performance...
important is the amount of VM's in a datastore and its role (DB, AD, backup server)
This server has four VMFS datastores dedicated, the RAID of the storage LUN is Network RAID-10 (2 Way Mirror).
How many VM are in each datastore ?
In this Lefthand cluster every server has dedicated VMFS datastores in total there are four servers (but the one with snapshot removal problems is the only active).
that server is in a datastore that has free space? and how are the snapshots?, that is very important as I said before
The server has the following VMFS datastores;
VMFS01
Size: 250GB
Free: 95GB
Server config
Virtual Disk 40GB
Virtual Disk 20GB
Virtual Disk 60GB
Snapshot delta files (when snapshotting)
VMFS02
Size: 450GB
Free: 49GB
Virtual Disk 400GB
VMFS03
Size: 1,6TB
Free: 101GB
Virtual Disk 1,5TB
VMFS04
Size: 1,99TB
Free: 91GB
Virtual Disk 1,9TB