Re: RAIDframe parity logging

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Fri, Aug 07, 2009 at 11:59:31AM -0400, Thor Lancelot Simon wrote:
> I have been intrigued by the performance numbers from the CMU
> parity logging paper for a while now:
>       http://www.pdl.cmu.edu/PDL-FTP/ParityLogging/ISCA93.pdf
> Essentially, they claim RAID1-like performance for small writes
> with RAID5-like storage efficiency.  The numbers in the paper were
> generated with code related to our in-kernel RAIDframe.

This is, by the way, raid level 'L' according to our raid.conf files.
And you need options RF_INCLUDE_PARITYLOGGING=1 in your kernel
configuration.

Thor