Very slow backup speed in one of our Netowrker Servers.

[LegLegato]

We have a Networker Server version 6.2 with a tape library ADIC scalar 218 with two DLT7000 tape drives. Server has also a storage node with another ADIC scalar 218 unit. When we backup clients through network, the speed we get on main server is not higher than 200 to 300Kb/sec. If we redirect the same client to the storage node the backup speed goes up to almost 6MB/sec. When main server runs a backup of itself the speed goes up to 7MB/sec. Once it starts a backup through network the speed goes down to 200 to 300Kb/sec. Well, I ran a NT backup of the same client going to the same tape library and backup is much faster than Legato. Any idea why? This is the only server we are having slow backups. I have directed most of the backups to its storage node as they complete much faster. OS is windows NT 4 sp6. We have also replaced the NIC and reinstalled its driver. Situation is the same. Properties on the NIC show that negotiation is locked to 100/half.
One more thing: SPeed is the same, very low with other clients too. No matter what I backup the speed is unacceptable. Tape drives have the latest firmware, same as the tape drives in the storage node library.

Any suggestions you might have is appreciated.

Thank you.

 

[ptwork]

I think your problems lies in this "Properties on the NIC show that negotiation is locked to 100/half. " You want to be at full duplex. Below is an excerpt from thread thread480-44741
if this doesn't completely help you, suggest you do a keyword search on duplex.

cfowler (MIS) Jan 10, 2001
Hi there,

I experienced a similar problem upon first installing this software. When you setup your clients, Datensicherung is correct, you should make certain that you have the NIC in your server / clients set to 100 Mbps / Full Duplex and make certain that the ports on the switches the server / clients are connecting to are also set to the same (100 Mbps / Full Duplex). If the config is different between the server / client NIC and the port on the switch, they will not negotiate correctly. Leaving both set to Auto for speed and duplex is not a good idea either, there's no guarantee they will negotiate correctly each time.

Good luck,

CF



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mgdaviso (TechnicalUser) Jan 17, 2001
Here's a first I actually got a quick response from legato. They essentially said what cfowler said. We changed the NIC and switches to be 100Mb/FUll from 100Mb/auto and the speed is blistering now!
thanks everyone
Mike davison
mike.davison@avon.com

 

[LegLegato]

Well, its storage node is set for 100/half but is very fast when it comes to backup these network clients. Once I redirect it to main server the speed drops to 200Kb/sec.

 

[gupel]

Have you try to copy files from server and storage node to the client? If there is a duplex missmatch, you will notice the difference.
What is the "Parallelism" settings on the server/stor. node/client/tape drives.
What I notice myself, is that smaller number for the client and for the tape drive increase the speed of the backup for that client.