We are looking to increase the performance of our vmware as a whole. Please read and then re-read my post a few times before you comment.
Here is a quick run down of our systems.
6 IBM 3650s M1s and M2s (yes they are older say 5 years)
4 Iscsi cat 5 cables to an HP 5406 ZL switch (2 for vmotion 2 for iscsi data)
IBM DS3500 SAN 48 disk (sas2) raid 10 split into 6 luns 5 for production 1 for ISOs
IBM DS3300 12 disk san raid 5, split into 4 luns. (This is where our backups are pushed to)
Veeam runs 3 primary production servers automated every 4 hours. SQL, Email, and other servers are done manually with Veeam every 3 months.
Backups from with in SQL, and Email servers are varied. Email is Daily, SQL has a much more often backup.
SQL backups can be very quick, only seconds, to 17 minutes, it all depends on how many transactions are done. This size is 300 megs to 15 or so gigs.
50 running servers, various flavours 2003 TS to 2008 R2 domain controllers.
Split networks for data and iscsi. They do not interact.
Our biggest issues are:
When backups run (SQL mostly) and Email. We get a huge slow down, and various issues right across the board. I monitor these lines and see that the pipe is running at 300-800mbit depending on what is happening during backups. Normal run speeds are in the 8-16 mbit range.
These are very big backups for us but vastly important:
Transaction logs every 15 minutes, differentials a few times a day and fulls at midnight. I dont know the exact details on them, but this is what the company has laid out as acceptable risk.
My job is to get the data to the backup and to make sure things are running smoothly.
At this point in my opinion there is simply not enough pipe to push the data quickly enough from A to B, there is more than enough disk on the 3500 to send and more than enough disk on the 3300 to receive.