Solved

HP MS2A2012I SAN Question - Controller failure, Data loss or not?

Posted on 2010-11-24
5
473 Views
Last Modified: 2012-05-10
Hi,

I'm just looking for some clarification on what happens in the event of a controller failure on a SAN. Our outsourced IT  recently had an issue with a HP SAN where the controller failed and as there was no secondary controller,  they had to order a part and then restore the unit. The Outsource company is recommending we buy a second controller as we have the same model as one that they had issues with. All our VM's reside on this controller, there are weekly full VM backups to another physical machine.

Just wondering if the data is always safe in this event as they are saying the data is safe. Is this correct? How is the info stored on the disks? I'm not a storage specialist so would like advice from those who are.

Cheers
0
Comment
Question by:afi99
5 Comments
 
LVL 10

Accepted Solution

by:
Wolfhere earned 125 total points
Comment Utility
As long as the backed up data is stored "off site", you are pretty safe. Its just a matter of having redundancy on hardware. Pretty safe, but safer with the redundant controller. The data is not on the controller, it resides on the drives. Your SAN has HD redundancy but no controller redundancy. You would rather be safe than sorry...waiting on a replacement. Good call by your Outsource company
0
 

Author Comment

by:afi99
Comment Utility
Good call but a case of reactive planning rather then proactive, they sold the original SAN's without redundancy.

Sorry, I just need a little more clarification, if the backups fail  and we're relying on the SAN drives then no issue as long as we replace with the same controller?
0
 
LVL 23

Assisted Solution

by:jakethecatuk
jakethecatuk earned 125 total points
Comment Utility
as wolfhere has said, the data is on the drives and will always be on the drives.

if the controller fails and is replaced, the controller will look at the disks for the raid configuration in use on the array.  provided the controller is the same as the one that failed, then this process will work seemlessly and you shouldn't have any issues.

if your backups have failed as well, then again, provided you haven't suffered drive failure, your data should be safe but you are at risk.
0
 

Author Comment

by:afi99
Comment Utility
Thanks guys much appreciated
0
 
LVL 20

Expert Comment

by:SelfGovern
Comment Utility
In fact, MSA supports upgrading to newer controllers without loss of data.   HP publishes white papers on the steps to take (what info you need to record in order to perform a smooth controller upgrade) -- it turns out that the same information you'd capture to do an upgrade would be required for a replacement due to failed HW... so it may be worthwhile to go to www.hp.com/go/p2000 , download the upgrade white papers, and make sure you've got the necessary information recorded and saved securely.

(In a rebranding effort, the MSA is now the P2000 MSA, starting with the 3rd generation of the product)
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

A quick step-by-step overview of installing and configuring Carbonite Server Backup.
Storage devices are generally used to save the data or sometime transfer the data from one computer system to another system. However, sometimes user accidentally erased their important data from the Storage devices. Users have to know how data reco…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now