Re: Four Drive RAID-5 on RAIDFrame Considered Harmful...

Thor Lancelot Simon <[email protected]> Tue, 9 Oct 2007 21:53:01 -0400

Newsgroups	gmane.os.netbsd.devel.performance
Message-ID	<[email protected]>

On Tue, Oct 09, 2007 at 04:59:58PM -0700, Robert P. Thille wrote:
> 
> I tracked it down to the problem that 2 and 3 are relatively prime :-)
> Given 4 drives in a RAID-5 setup, you get 3 data blocks per raid stripe, 
> but the filesystem block size Must be a power of 2, so you always have 
> to write at least one partial stripe.

No.  Examine the "maxcontig" FFS parameter.