RAID Controller Failed On IBM RS/6000

Feb 15, 2007

We had one of RAID controllers failed on our IBM RS/6000 server. There are two RAID controllers on this server, one holds the OS (AIX) and the other one holds our database and this is the one that failed.

Anyway, I've always thought that once a RAID controller failed and we put in a replacement controller, it will reformat all the hard drives that were connected to the failed controller, which means we would have to restore the data from backup once the new controller is in place. However, the IBM technician we dispatched was able to build the new controller and connect all the drives to the new controller without reformatting the drives. I think he copied the RAID controller's configurations using SMIT. I think that was amazing; it saved us a lot of time.

My question is, is this something unique to IBM hardware/AIX or other hardware and OSes (Linux, Windows, etc.) have similar capability?

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I am looking to hook up 4 WD Velociraptors to a Raid array. My #1 priority is speed, thus I will be doing RAID 0.

I'd prefer something from Canada.

I just thought of it, 4 drives on RAID 0 might not be a good idea ... Should I opt for RAID 5?

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Quote:

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This problem has happened to me twice on the very same server. I can't seem to figure out what's wrong with it.

My raid controller is Areca 1160 + 1GB Ram + 16xWD4000YS. Initially I had the problem of the disk dropping from the array randomly. I suppose this problem has been fixed since I have upgraded disks firmware according to WDC suggestion.

But there's another problem now. From my observation, the controller is randomly dropped off the system. When this happen, I cannot read/write anything from the disk at all. I can SSH in and able to run Areca CLI tool to see what's going on but only to get the message saying that it cannot find any Areca controller.

My only option is to restart the server and fsck all those 16 disks (not fun). I checked the log on the RAID controller itself, there was no sign of problem at all. No alert, no disk being dropped off the array, no events logged at all.

I'm using CentOS 4.3. Firmware on the RAID controller is 1.41, latest is 1.42. (Stupid me for not upgrading firmware when server crashed.) I plan to take the server down for RAID firmware upgrade soon. I just hoped that it's just problem with the firmware, not the controller or backplane itself.

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Problem is now, i cant map to a drive... i need to do this so i can do an NT backup from the data off the drive, then restore that data to a new drive.

Here is what disk management looks like:

http://www.digitallyhosted.com/disk_management.gif

However when i look at it in Active Partition Recovery.... without running any recovery tools... it sees the data on all the drives fine:

http://www.digitallyhosted.com/partition_recovery.gif

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About my website:

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Quote:

Today we are going to conduct a detailed study of RAIDability of contemporary 400GB hard drives on a new level. We will take two "professional" drives from Seagate and Western Digital and four ordinary "desktop" drives for our investigation. The detailed performance analysis and some useful hints on building RAID arrays are in our new detailed article.

[url]

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[url]

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[url]

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Code:
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Mar 28 22:43:08 server kernel: 3w-xxxx: scsi2: Command failed: status
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Hard Disk 2: 500GB SATA-2 16MB Cache

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