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RAID1 Array - Degraded/Rebuild?  

post #1 of 7
Thread Starter 
Hey,

I've had a RAID1 array running for a good few months in my new rig, with 2 X 1TB HDD's. Basically it's just storage, no programs/anything installed on it, purely for storage. I've seen the Intel RST do a rebuild once, but that was after a defrag on the array so I assumed it was normal. This is my first RAID1 array.

Today I started up my PC, it paused on the RAID Config utility and next to the RAID1 Array it said "Degraded" as the status. I thought it was odd so I restarted, went into the RST Manager and it was as shown below:

temporary-17-1.jpg

Apologies for the awful picture, phone was all I had on me.

I booted into Windows, and the Intel RST says this:

ohno.png

This is worrying as it's taking a very long time to do it (only at 33.71% now..). I can still access the drive fine, though.

Why has this happened/is it bad/something to worry about? Or am I just worrying and it's a simple thing that happens. Assuming it may be that it's copying something that's missing from one hard drive over to the other, possibly. As I said, this is my first RAID1 array so I'm not totally clued up. redface.gif

Thanks. smile.gif
Edited by SmokinWaffle - 11/19/12 at 8:28am
    
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post #2 of 7

It basically means one drive was slower writing data than the other. I wouldn't worry too much about because obviously you still have at least one drive which is working. (Probably some power saving feature of the drive turned it off) I have heard other people saying that a rebuild can take hours and hours especially with larger volumes because it has to check each bit and rewrite the missing data.

 

Just don't click cancel (if you can) or anything like that. I wouldn't try to acces the drives since you'll just make the process slower.

post #3 of 7
Thread Starter 
Quote:
Originally Posted by noobhell View Post

It basically means one drive was slower writing data than the other. I wouldn't worry too much about because obviously you still have at least one drive which is working. (Probably some power saving feature of the drive turned it off) I have heard other people saying that a rebuild can take hours and hours especially with larger volumes because it has to check each bit and rewrite the missing data.

Just don't click cancel (if you can) or anything like that. I wouldn't try to acces the drives since you'll just make the process slower.

Well it's finished rebuilding now, just copied another 5GB to it so we'll see what happens.

Do you mean that it hadn't finished copying data from one drive to the other, and I turned off my PC, that is classed as needing a rebuild? Would make sense, although calling it a rebuild seems a bit extreme. tongue.gif

The power on hours are very similar (756/752), so I don't think it was an issue of it turning off during copying due to power saving (although I have heard one drive spin down after long periods of inactivity).
    
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post #4 of 7
the RST RAID feature is annoying sometimes, seeming to rebuild for no good reason. It took hours to do it when I took my computer apart for cleaning. I guess I put the SATA cables on different ports than I did the first time, and it required a full rebuild because of this. It did it once after a hard reset, but the disc hadn't been written to in hours. Couple of other times for seemingly no good reason. Aggravating to say the least, but I am kind of glad that it keeps the discs in exactly the same shape.
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post #5 of 7
Quote:
Originally Posted by SmokinWaffle View Post


Well it's finished rebuilding now, just copied another 5GB to it so we'll see what happens.
Do you mean that it hadn't finished copying data from one drive to the other, and I turned off my PC, that is classed as needing a rebuild? Would make sense, although calling it a rebuild seems a bit extreme. tongue.gif
The power on hours are very similar (756/752), so I don't think it was an issue of it turning off during copying due to power saving (although I have heard one drive spin down after long periods of inactivity).

It doesn't copy the data from one drive to the other except if it's rebuilding if that's what you mean. In a functioning raid1 config the controller duplicates the data so it's right away on both drives. If you're using two different hdds it could be that you did turn of your computer a long time ago by unplugging it or pressing reset and the slower one didn't write all the data.

 

The raid controller would probably only notice that some data is missing on one hdd when you opened a file and only one hdd could find the whole file. (That's just my theory tongue.gif)


Edited by noobhell - 11/19/12 at 10:36am
post #6 of 7
Quote:
Originally Posted by noobhell View Post

The raid controller would probably only notice that some data is missing on one hdd when you opened a file and only one hdd could find the whole file. (That's just my theory tongue.gif )

Any raid controller worth it's salt won't wait for you, it's called verification.
Quote:
Originally Posted by SmokinWaffle View Post

This is worrying as it's taking a very long time to do it (only at 33.71% now..). I can still access the drive fine, though.

How long does it take you to copy 2TB of data? it will take at least that long.
 
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by u3b3rg33k View Post

How long does it take you to copy 2TB of data? it will take at least that long.

Not that long seemingly. tongue.gif

Glad it's nothing to worry about, thanks guys!
    
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