Re: IIs factible to implement full writes of strips to raid using NVRAM memory in LFS?

[Jose Luis Rodriguez Garcia <joseyluis%gmail.com@localhost>]

Thank you for your correction.

I had this doubt from time ago. but i was inclined to the wrong answers.

A question out of topic: ¿A raid-5 of 5 disks has the same performance
for partial stripe writes than a raid-5 of 10 disks? If the parity is
"striped" across all disks, then a raid-5 of 10 disks must have better
performance.

On Thu, Aug 18, 2016 at 8:17 PM,  <Paul_Koning%dell.com@localhost> wrote:
> That's not correct.
>
> You're right that partial stripe writes are more expensive, but they are not *that* expensive.  For RAID 5, the cost is two read and two writes: read/write of the data disk, and read/write of the parity disk.  For RAID 6 is it three reads and writes (read/write on both of the P and Q disks).
>
>         paul