jabba359 wrote:I make a weekly backup of my boot/OS/application drive, so when the array failed I reverted back to an image of the previous week's drive. That didn't fix anything. If I understand how a RAID array functions, however, when drives are dropped out of the array, the computer marks them so that they don't automatically join back in the array. The only way to get them join in is to reformat the array and add them in (losing all data).
NOT TRUE!!! Do not re-insert a bad drive back into the array. That will destroy data. A bad drive needs to be replaced. If only one drive fails the drive array will still work. On your server, are the drives hot swap (can you install one with the PC still running)? If they are there may be LEDs on the face of the drive indicating it's condition with different colors. Replace the bad drive with a new on and it will rebuild back into the array.
I've gotten some demo software that creates a virtual software RAID, and it looks like most of my information is intact. They want $180 for it, so I was looking for other possible solutions.
FROM JACK Never heard of this but that doesn't mean it won't work. I've just never heard of it.
I had thought a RAID 5 would keep things like this from happening, as I've never had a hard drive fail and the chances of two drives going bad at the exact same time are astronomically slim. Guess I didn't account for software errors taking the drives offline. Lesson learned. Even if I have a redundant system, back it up anyway!
, Is you array set up in the BIOS or the OS? I used the BIOS level since it is created prior to the OS.
You need at least 3 hard drives the same size. RAID 2 is used with 2 drives and it's called a mirror as the second drive is exactly like the first.
You have 4. That means 1 of the 4 drives is not seen as usable drive space. If each drive equals 100 gb that equals 400 gb of space. However, you only have 300 gb of usable space. The other 100 gb is used as an online backup for lack of a better phrase. The data is scattered throughout the drives. That way if one drive fails you can replace it with a new one and it will be built back into the array with no data loss. As you said though two drives don't fail at the same time in a perfect world. Your data is gone gone gone. That's why it's still important to backup whatever is on the array drives to another place before this happens. Re-writable DVDs are an easy option. They are cheap and you can use them over and over. If your OS was on the other drive you should still be able to boot up, just not see whatever you had on the drive array (I think you gave it the drive letter D
According to me all data on the drive array is gone. There may be options I'm not aware of. It's been over 5 years since I've worked on this kind of stuff.
Hope this is informative even if you can't get your data back. It may help next time. Always have backups of anything you can't afford to loose and always test restoring files that have been backed up. I've seen companies loose thousands worth of data and customer info. Think of a bank that lost your mortgage with no backup. No more house payments for you. Yeah!
I had a customer once that had a project on a drive valued at a whole lot. The controller went bad. That's the circuit board mounted on the drive. They sent the drive to a company that takes the drive apart and tries to get the data off the disks themselves. I heard the bill for that was over $4000.00.