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Monday, October 28, 2013

What is colocation?

A Colocation center is a type of data center, where space, bandwidth are available for rental. The organization basically provides, physical safety of your server with rental charges on space, bandwidth, network facility and safety of the server at a minimal cost. The organization, handles many customer servers under the same roof.

Sometimes, the organization might provide you the data center management as well. This is quiet common in IT sector, due to the connectivity over internet. Organizations, like to focus on IT work instead of managing and building its own data center. However, when your organization is considering Colocation facility , you need to focus on the Service Level agreement, and look if it has some hidden rules or charges.

In my experience, my organization has have a colocation facility for its DR system. We have the production system in our own data center. Since, DR system needs to be kept at another location, taking up Colocation was a best choice, as we need not require to build another data-center for DR system. But, yes Colocation facility could be a concern if you manually need to visit the site often. That would incur to additional expenses. In our case, we had a agreement with the Colocation provider to raise ticket with them to provide any authorized person to get access to it when needed. And when need arises, we let the Vendor IBM to provide Customer Engineer (CE) to visit that location and fix the issues. Though, this is little tedious compared to getting CE at our own premises, but its manageable. For, AS400 system colocation facility is apt according to me as this is quite robust and does not usually need a manual intervention. 

Changing IP address of the system

Hi Readers,

I had kept busy for a while so could not blog in meanwhile. Now, the latest challenge in my work place is to get one of our iSeries system moved to another data center. This machine will have to moved to its assigned data center via another place. So, we might have to change its IP address and work with data mirror IP address change twice before we settle this.

Since, I would connect to it remotely and won't have any physical connection, we have things to clarify before we go ahead and do it.

In IBM TCP-IP, we can add the new IP address before we shut down the system and after it is relocated to it destination, we can remove the old IP address and connect to the new one. So, how to get this done. Here is a set of procedure for it.

The following are steps to change a TCP/IP address on IBM OS/400 or IBM i5/OS:
    1.
    On an operating system command line, type the following:
   
    CFGTCP
   
    Press the Enter key, and select Option 1.
    2.
    Select Option 10 to end the Interface.
    3.
    Press F12 to get back to the Configure TCP menu.
    4.
    Select Option 2 to work with routes.
    5.
    If there is a route that is associated with the interface, it will need to be removed.  Otherwise, you will get an error later when trying to remove the old TCP/IP address.  (Press F6 to print this screen.  It will go to your spooled file so you can have a record of it.)
    6.
    Once the route is removed, press F12 to return to the configure TCP screen.
    7.
    Select Option 1 to work with TCP interfaces.
    8.
    Select Option 1 to add the new TCP/IP address.
    9.
    Select Option 9 to start the new TCP/IP address.
    10.
    Select Option 4 to remove the old TCP/IP address.
    11.
    Press F11 and the new TCP/IP address should be in an active status.
    12.
    Press F12 to get to the Configure TCP/IP menu.
    13
    Select Option 2 to work with TCP/IP routes.
    14.
    Select Option 1 to add a route if needed.
    15.
    Press F12 to get to the Configure TCP/IP menu.
    16.
    Select Option 10 to work with the Host Table.  If you have the old TCP/IP address associated with the Host Name of the iSeries family system, you must remove the old address, then add a Host Name with the new TCP/IP address.  If you do not have anything there, then you do not have to do anything.
    17.
    Press F12 to get to the Configure TCP/IP menu again.
    18.
    Select Option 12 to change TCP/IP Domain.  If the TCP/IP address of a Domain name server changes too, you will change it here.  If you do not have an external Domain name server, then you will not need to make any changes.
    19.
    Your PCs should now be able to connect to the new TCP/IP address on OS/400 or i5/OS.
   
Similarly, we can change the IP address in data mirror. Since, we are using icluster, we have option to add the new IP address. Just before, shuting the system, we can change the IP address and then shut the system down for shipping. 
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