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In place upgrade of RAID1 to RAID5 - Page 4

post #31 of 32
Quote:
Originally Posted by tomaskir View Post
I do not understand what you are trying to say, sry man

But instead of typing 2 pages worth of explanation, in all good spirits, go read up on raid5 and parity distribution and data recovery from parity blocks. (not flaming or trolling, just that I dont feel like typing a whole lot) Saves me the typing
lol, I think I was trying to say that lack of sleep causes me to create new magical raid types
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post #32 of 32
Quote:
Originally Posted by rpm666 View Post
My understanding was single disk parity = loss of one drive, and single point of failure.
While striped parity allows no disk loss and no individual points of failure.

Edit:No sleep = mixing RAID4 and 5.
No, the main disadvantage of the parity on a single drive (RAID4) is that it bottlenecks the array because if you write data to 2 different drives, they both need to update the parity on that one single parity drive.

In RAID4 it doesn't matter which drive you lose, you are still protected against one drive failure. The controller just needs to know whether you lost the parity disk or a data disk. If the parity disk was lost then just recalculate the parity. If a data disk was lost then just rebuild it using the other data + parity info. RAID5 rebuilding has to do a mixture of this because when you lose a drive, you lose some parity blocks AND some data blocks.
Edited by pmaster - 4/16/11 at 5:40pm
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