• Subject: Re: Raid to Mirror comparison
  • From: "Jeffrey M. Carey" <jeffreycarey@xxxxxxx>
  • Date: Tue, 20 Jan 1998 13:02:58 -0600
  • Organization: Trase Miller Solutions

In fact on a system before the "e"series, if you had RAID 5 you had to
mix protection - the load source could not be part of a RAID set, so the
best you could do is mirror.  

One note on mirroring vs. RAID - when we've lost a drive on our mirrored
system, we haven't noticed (in fact, the performance gets better since
miroring gets suspended for that pair and available DASD increases).  On
RAID, the system will stop for a about five minutes when a disk crashes.

PaulMmn wrote:
> 
> >Will this be a new AS/400 or are they looking to install on an existing
> >box ?
> >What approx. disk capacity do they have (MB).
> >With the new model 6xx and Sxx series you can RAID-5 the base (Load
> >source) disks, so you could install four 4GB or 8.5GB drives and have
> >16GB or 25.5GB usable disk with RAID-5.
> >With older systems mirroring was often cheaper because you had to mirror
> >the load source drive.
> 
> Once release 3.1.0 came out you could =mix= protection types in the same
> ASP, so you could mirror the load source and have everything else RAID and
> only have a single ASP.
> 
> --Paul E Musselman
> PaulMmn@ix.netcom.com
> 
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