On Thu, 13 Nov 2008, Bill Davidsen wrote:
These are probably a good fit with your budget and reliability needs.
It's important to note the difference between the drives aimed for raid use and the ones aimed for non-raid use. This has been said before, but I think it's worth saying again, as I was hit by this.
If there is a problem reading a block the raid capable drives will return an uncorrectable error very quickly, relying on the raid controller to re-calculate parity and re-write the block. A desktop drive will try to read the block for several seconds until it fails, and in my case, it usually succeeded in reading it, meaning my reads from the raid were stalling.
So, if you want your raid to work well, get the enterprise class drives, they are rated for long term use, and more importantly, they have the firmware to play well in a raid environment.
Looking at the md code in linux, would it be possible to do some work around here in that if a drive read operationstalls, let's try to read from the other drives and then re-write the block on the drive that stalled?
-- Mikael Abrahamsson email: swmike@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
