Subject: Re: 3ware RAID controller slow?
To: Bill Stouder-Studenmund <firstname.lastname@example.org>
From: Jukka Marin <email@example.com>
Date: 10/30/2007 19:39:41
On Tue, Oct 30, 2007 at 08:49:01AM -0700, Bill Stouder-Studenmund wrote:
> > Then why is RAID5 slow and a plain disk isn't (when extracting the same
> > pkgsrc tarball)? I'm trying to find out whether I can use RAID5 or not,
> > that's why I'm asking ;)
> What could be happening is that you're doing a lot of RMW operations when
> you write metadata. They are slow and add synchronous reads into important
> i/o points.
That could be it - after the RAID controller and the disks run out of buffer
> > (Although I need to find a way to break the 2 TB disklabel barrier first..)
> Disklabels don't break 2 TB. That's why we have wedges.
Could someone please provide a pointer to a wedge tutorial? Please? :-)