Re: WAPBL vs. lfs?

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

On Thu, Aug 28, 2008 at 01:34:05PM -0700, Aaron J. Grier wrote:
> On Tue, Aug 26, 2008 at 06:36:42PM -0400, Thor Lancelot Simon wrote:
> > These [NVRAM] cards are *not* cheap.  Solid-state disks with SAS or
> > SATA interfaces are likely to be a lot more cost-effective.  What
> > would really rock would be firmware for one of the NVRAM-equipped RAID
> > controllers that allowed small volumes to be created which existed
> > only in the controller NVRAM.  I was discussing _that_ with an
> > engineer at Mylex when they were eaten by several other companies in
> > quick succession and, again, nothing came of it -- too bad.
> 
> I assume NVRAM can be straight memory- mapped, and that the latency and
> bandwidth would be a lot shorter / higher than trundling through layers
> of drivers to access an SSD on the other end of SATA or SAS.

Yes.  But I don't think it matters: both are so much better than a rotating
or flash disk, the performance improvement is likely to be the same.

Thor