Re: Linux SATA RAID FAQ

Jeff Garzik
2004-08-14T22:56:40Z

On Sat, Aug 14, 2004 at 10:49:24PM +0100, Alan Cox wrote:
> On Iau, 2004-08-12 at 18:30, Jeff Garzik wrote:
> > > The SX4 has an on-board DIMM (128M - 2G), through which all data _must_
> > > pass. The data transfer between host and on-board DIMM is a separate
> > > DMA engine and separate interrupt event from the four ATA DMA engines
> > > (one per SATA port). There are several possibilities that are worth
> > > exploring on this card:
> > >
> > > * Caching
>
> Is it battery backed ? If it is battery backed then its useful, if not
> then it becomes less useful although not always. The i2o drivers have
> some ioctls so you can turn on writeback caching even without battery
> backup. While this is suicidal for filesytems its just great for swap..

Nope not battery backed...

Jeff