Add another drive to RAID 5 question

[alexlyc]

If I partition a 3x 1TB raid 5 array into two partitions, when I add another 1TB, will I lose my data during upgrade? And if two drives fail at once in a 3 drive raid 5 setup, what's gonna happen?

I am raiding with 3x 1TB black on ICH9R.

 

[Blue Fox]

I don't believe the ICH9R is going to support RAID capacity expansion, but you don't lose data during expansion. If two drives fail, all your data is gone. That's how RAID 5 works (and it doesn't matter how many drives you have either).

 

[Syntax Error]

I highly doubt ICH9R would support online capacity expansion.

 

[alexlyc]

What about raid 10 with 4 drive, if two drives drop?

 

[Syntax Error]

Only if the two drives are members of a paired mirror, then your data is still "safe". If you lose a disk in each striped mirror, your data will be lost I believe.

Sometimes thinking about RAID10 myself can be kind of confusing!

 

[Blue Fox]

What about raid 10 with 4 drive, if two drives drop?

There is a 66% chance of losing all your data if a second drive fails. It all depends on which drives die.