Hi,

Do you get that speed while doing the network baclups or while doning the SAN Off-Host backup.

If its the network backup then it seems OK as i also receive somewhat same results..Message was edited by:
Mayur Shinde

There is a FAQ sheet written on tek-tips that you may be interested in viewing. It's a little old but it does include LTO2
http://www.tek-tips.com/faqs.cfm?fid=3984

Hi,

This speed of 10-12MB/sec is through SAN. I also have some Lotus Notes clients in the same environment which are backing up through a 100MB backup LAN and I can only achieve about 4-6MB/sec. The result is disappointing for LTO2. I have seen other similiar environment also backup Windows files using LTO2 (But without Notes agent) and it can achieve to max about 20+MB/sec.

Is it the characteristics of Notes backup ?

WP

May be they are on fibre.

Bob - what is the ideal speed that should be achived on 100 MBPS as per your experience.

hi danny i suggest u to test your netbackup performance firtst , this articles maybe usefull for you..
http://eval.veritas.com/downloads/edu/instructor_a...

Hi Harun,

Thanks for the pointer. However, the testing method mentioned in the article is to trouble-shoot Network bottleneck. Mine is a SAN media server so the data is directly pump from the media server to the tape drive on SAN. Although there are some metadata running in the network to the master server I don't it will cause so much difference.

Regards,
Danny

Hi,

Is your SAN-TLU-BACKUP server architecture a three-way configuration?
By three way i mean that is the TLU and the Master server connected connected to the SAN switch ?
Or is the TLU only connected to the SAN ?

Hope it makes sense.

Danny,

Not only does the test that was referenced earlier test for network bottlenecks but it also shows you the maximum possible throughput for the backup server in question. Network and SAN speed are not the only bottleneck possibilities. It is also possible that there is a processor, memory, or bus bottleneck on the server. This is part of the reason there really isn't any reference for speed because each environment is different. I would run the test and if the difference between the theoretical max and what you are seeing is more than about 25% than it is time to investigate further. If not, then you are getting the best throughput the server is possible of getting.

One other thought, make sure that the Emulex HBA driver is up to date. Older drivers had multiple issues including throughput problems.