Regarding Network Interface Card

Linux and Unix-Like Red Hat
1

Dear All ,

While taking backups in one Linux Server , we find one alert came with regard to Network Interface Card.

Pl find the below alert.

Network Interface Card performance for NIC:eth1 has exceeded Major threshold.
Bytes sent and received per second (Average)= 105540.303101 (Threshold = 100000)

Kindly any one explain this alert and also tell how to overcome this.

Thanks in Advance,
Rj

2

Hi jegaraman,

What backup tool are you using?

Regards

Dave

3

Hi Dave ,

We are using Symantec Netbackup tool.

Thanks and Regards ,
Rj

4

Hi,

This could be down to several things, firstly a couple of questions.

First, what version of Netbackup.
Second, was the error on the Client or the Server.
Third, how much data - I think in some older versions these type of errors were due to size.
Fourth, what is being backed up and how - is it NDMP etc.

The more information that you provide, the better the chance that someone will be able to assist you.

Regards

Dave

5

Dear Dave ,

Netbackup Version : NetBackup-RedHat2.6.18 7.6.0.3
Error was from Client Side ( in the interface of the client )
Data that has been backed is DB , and its size is small around 300 G and in 18 minutes it completed.

Kindly let me know how to go about this......Should any thing from Netbackup side we need to some configuration changes..,...

6

Hi,

OK, some things to check.

First, ensure that the networking is properly set all the way from client to server. By that I mean,

  • All speeds must match - under no circumstances allow auto negotiation.
  • Everything should be full duplex all the way through.
  • Ensure that the "NET_BUFFER_SZ" variable matches your DB requirements.

A little by the way of explanation, all your network interfaces all the way through should be set to the same speed - for arguments sake - 100Mb Full Duplex - this includes switches.

There are a lot of available settings to configure the Client and the Server communications in Netbackup, also your version is later than the version I'm running here. I'm assuming that you will have support on a version as new as that. So I'd be tempted to check the Symantec site - the support there tends to be quite good.

Anyway, let me know how you get on.

Regards

Dave

7

Dear Dave ,

I find the below inputs

[root@dw01db02 ~]# mii-tool eth0
eth0: negotiated 100baseTx-FD flow-control, link ok
[root@dw01db02 ~]# mii-tool eth1
eth1: negotiated 100baseTx-FD, link ok
[root@dw01db02 ~]# mii-tool eth2
eth2: negotiated 100baseTx-FD, link ok
[root@dw01db02 ~]#

I think the interface meets what you have said . I shall check with NET_BUFFER_SZ with netbackup team.

Thanks and Regards
Rj