IT Infrastructure blog

January 26, 2011

NetApp take over / Give back in Active-Active Cluster configuration

Filed under: NetApp — Akther @ 10:57 am

 In this blog post i am trying to explain how we can use NetApp commands such as Take over and Give back in Active/Active Cluster mode configuration.

Active /Active cluster means, you should require 2 controllers and these two controllers should communicate each other. There would be a connection between these 2 controlelrs by using a connection.

We had requirement that we need to take offline of controller 2 ( which is our development LUN’s and CIFS volumes are connected)

We can use below  commands to do the cluseter switch before we took the offline of controller2. Here is the command

First we need to check the status of the cluster ( is it enabled or disabled)

Controller1> cf status
Cluster enabled, Controller2 is up.

Controller1 > cf  takeover

This command will take over the controller2 resource entirelly and will work continuosly with out any affect. User wouldn’t know this take over. Once you give this command you will log off from the controller2 session and it will be hand over to controller1 entirely.

Now controller2 is running and using the resource of controller1 and the performence you can decrese little bit. And the controller1 conole prompt will change to take over mode and lots of logs will come to the console.

Once your work is over you can return back by using below command

Controller1 ( takeover) > cf giveback

Always better to disconnect any user or appliaction before you take offline of any controller.

Hope this will helpfull somebody who is working in NetApp storage. Appreciate your comments and suggestions.

Thanks

Akther

January 15, 2011

Secure Mail/Email Gateway: How Can we Block Mail from Entire Subnet?

Filed under: McAfee Email Gateway ( Ironamil) — Akther @ 7:17 am
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We are using McAfee Securemail 6.7.1 version as our Email Gateway. We replaced Edge Transport server to handle Spam filetering efficiantly. And it’s a good product and we are using since long.

There is requirement to block email from entire subnet and we have to do it in Securemail. To do this we have to follow below steps.

From the admin console: ( GUI)

1.Click the Anti-Spam tab.

2.Navigate to Anti-Spam Advanced, Deny List, Local Deny List.

3.Click Add New.

4.Go to the Add an IP address or subnet field and enter the subnet octets without the trailing dot.

For example, 66.177.104 would block IP addresses 66.177.104.1 – 66.177.104.254.
5.Click Submit.

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