Re: multiple RAID sets

["Aaron J. Grier" <agrier%poofygoof.com@localhost>]

On Mon, Mar 15, 2010 at 07:32:53AM -0400, Greg Troxel wrote:
> Steven Bellovin <smb%cs.columbia.edu@localhost> writes:
> 
> > I'm putting together a file server that will have two different
> > (software) RAID sets: the system set, composed of two disks in a
> > RAID1 configuration, and a data store composed of several disks in a
> > RAID5 configuration.
> 
> Do people believe that RAID5 in raidframe is safe to use?  With or
> without write caching?  With or without a UPS (or two on dual
> supplies)?  I always had the impression that the code was believed ok
> but that one really needed to believe that read-modify-write cycles
> would work reliably.

I have used RAID5 in the past with NetBSD and it has dealt with disk
failures as expected.  I don't know if anybody has done any analysis of
RAIDFrame and the "RAID5 write hole".

-- 
  Aaron J. Grier | "Not your ordinary poofy goof." | 
agrier%poofygoof.com@localhost