Subject: Re: Bad performance, biowait on raid device
To: Stefan Wurstbauer <>
From: Thor Lancelot Simon <>
List: tech-kern
Date: 03/14/2006 17:28:41
On Tue, Mar 14, 2006 at 06:09:51PM +0100, Stefan Wurstbauer wrote:
> Hi all,
> I'm running NetBSD 3.0 on a Dell PowerEdge 4600 server. The disks are
> 4 scsi disks / raid 5 on a hardware raid controller, mounted as a ffs
> filesystem (without softdeps). 
> When I, for example, extract pkgsrc.tgz I take ages to complete.

*What* disks?  *What* "hardware RAID controller"?

A lot of hardware RAID controllers are really quite awful, especially
for small, synchronous writes (which is what you'll get, with FFS
without softdep).