The overall throughput rate will be slower than the slowest piece in your data transfer chain.
I agree with Ed, the first thing you may want to check is if the client can read the data fast enough, use a tool like dd.
On client:
- Avoid using same HBA for reading from disk, and for backups.
- Try doing a multi-stream backup to utilize all target ports on FT Media Server. If you have 4 target ports, try sending 8 streams of data.
- Try large files. If you are sending several small files, you may not see optimal performance, since meta-data still goes on LAN.
On SAN:
- Make sure there is no congestion, avoid using ISL and trunking.
- Select the type of HBAs appropriately. QLogic 2Gb and 4Gb HBAs are supported in target mode
Theoretical max values are
o 2Gb/s support can have > 175 MB/s per port
o 4Gb/s support can have > 320 MB/s per port
- Avoid all-inclusive zoning.
On Media Server:
- Use PCIE slots if possible. Slots with at least 133MHz speed would be ideal. Check if you are using legacy 33 or 66 MHz slots. You will see a warning in VxUL 199 logs if you are.
- Similar to Client test, use a tool (like dd) to test the write speeds to backend media.
SAN Client Deployment - Best Practices and Performance Metrics guide has more information:
http://www.symantec.com/business/support/index?page=content&id=TECH54778
Hope this helps.
Tanuja
Tanuja Korlepra
NetBackup Engineering, IMG
Symantec Corporation
www.symantec.com
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts
Sent: Wednesday, February 23, 2011 12:10 PM
To: Heathe Yeakley
Cc: NetBackup Mailing List
Subject: Re: [Veritas-bu] Fiber Transport
The first check you need to do is to see if it's a NetBackup transport limitation. Do one of the various tests to see if you're reading off the file system fast enough (a backup to the null device is documented in a technote somewhere).
.../Ed
On Wed, Feb 23, 2011 at 9:38 AM, Heathe Yeakley <hkyeakley AT gmail DOT com> wrote:
I picked up some Enterprise Client licenses to speed up the backups on
some of my larger database servers. I've gone through the Fiber
Transport guide and setup everything as the guide suggests. When I
fire off my first backup, I'm only getting like 20 MB/s - 30 MB/s.
Those aren't quite the numbers I was expecting. I've gone back through
the guides and checked to see if there's some glaring mistake I've
made and I can't find one.
My question is this: For those of you that use FT, do I need to go
into the OS and change anything on the HBA? Is there perhaps a setting
in the OS or maybe on the firmware of the HBA itself that might be
throttling my SAN bandwidth?
Thanks.
- Heathe Kyle Yeakley
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