Solved

Loss of Data?

Posted on 2010-08-29
3
410 Views
Last Modified: 2012-05-10
Have an LSI MEGA RAID SAS 8308ELP Raid Controller with MegaRaid Storage Manager v. 2.30.00 on a Windows Storager Server 2003 Service Pack 2 Gateway Server. I am wanting to add one (already 4) SATA hard drive to a Raid 5 Array and keeping the same raid configuration on one enclosure. I also want to add 3 more SAS drives to another enclosure with 2 existing hard drives and change the Raid configuration to a Raid 6.   I am unable to back all of the data from the all of the physical drives.  
Question.  Is there a good chance that reconstructing the virutal drives going to wipe out my data on the existing drives?    
0
Comment
Question by:Van Johnson
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 7

Accepted Solution

by:
Casey Weaver earned 250 total points
ID: 33555620
The 8308 supports Online RAID Level Migration. and Online Capacity Expansion. I use one myself. Do just one task at a time to minimize the time the system is in a critical/vulnerable state. Handle the OS drives first if you have one, then the data drives. I've done move OLM and OCE. I went from a 500GB x 4 RAID 5 to a 2TB x 8 RAID 10 . First step was to use OCE to go from the 500 array to the 2TB's one drive at a time. After that I installed the second enclosure with the 4 more 2TB's and did OLM to RAID 10. This was slow and between work and all the two steps took about a week. It'll be much faster if you can take the system down and do the upgrades directly from firmware where the drives won't be under use as the array builds/rebuilds.

There's *always* a chance of data loss, but you *should* be safe. The card is designed to do this job. But there's always a flub. Make sure your card has a BBU and/or the server is on a battery backup that can last a typical outage, you really don't want to loose power without one of those going (most likely will kill your array), and if you can help it, you always want power going to the server.
0
 
LVL 47

Assisted Solution

by:David
David earned 250 total points
ID: 33555634
The controller supports online expansion, so yes you can do it.  Best practices include:
1. Making sure firmware, BIOS, drivers are all current (then do full power cycle)
2. Do data consistency check First (yes I know this takes time, but in event you have some disks with a lot of bad blocks, this cleans them up .. and if it can't clean them up, then it will trigger the hot spare rebuild).  So better to clean up any messes now.
3. Battery backup for controller HIGHLY recommended.  In event of power loss, or multiple simultaneous media errors, the BBU will prevent data loss.   It will also run much faster.  W/o it, it could add several days to the process.
4. make sure you back up (sorry, but this is best practices.  Odds are extremely low there will be a problem, but it is just plain wrong not to have a backup).   Don't forget, your operating system could always have some issue once the LUN(s) are resized.  The RAID controller won't care about such things as it is O/S agnostic.
0
 

Author Closing Comment

by:Van Johnson
ID: 33572934
Thanks for the tips
0

Featured Post

What Is Transaction Monitoring and who needs it?

Synthetic Transaction Monitoring that you need for the day to day, which ensures your business website keeps running optimally, and that there is no downtime to impact your customer experience.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Usually shares are where we want them for our users and we tend to take them for granted. There are times, however, when those shares may disappear causing difficulty for your users. One of the first things to try is searching for files that shou…
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
This video Micro Tutorial shows how to password-protect PDF files with free software. Many software products can do this, such as Adobe Acrobat (but not Adobe Reader), Nuance PaperPort, and Nuance Power PDF, but they are not free products. This vide…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

688 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