Re: URGENT HELP : RAID 5 verus Disk Mirroring

In article <325D6FA1.6E3B_at_dircon.co.uk> David Cheung <hawkent_at_dircon.co.uk> writes:
>From: David Cheung <hawkent_at_dircon.co.uk>
>Subject: URGENT HELP : RAID 5 verus Disk Mirroring
>Date: Thu, 10 Oct 1996 22:50:25 +0100
 

>HI ALL
>I appologise for sending this to the wrong newsgroup, I'm not sure which
>newsgroup to post this to.
 

>The first questions is : What is the difference between RAID5 and Disk
>Mirror and what is the pro's and con's between the two ?????

>The second question : I am in the middle of planning a network which
>must provide min. downtime and we're planning to use COMPAQ ProLiant5000
>Server with NT v4.0 and a Back up server with the same spec. Oracle 7.2
>will be the database running on this system. The server will have 2
>x 200Mhz processors with 256/128MB of RAM. Initially we will need to
>support a pilot group of 10 users using windows '95 clients. It will
>grow to around 100 users over the next 12/18 months with image
>processing as well.
 

>We are trying to decide whether to use Disk Mirroring or RAID5 or BOTH.
>We are planning to have external storage unit as well which will provide
>the RAID5 support on each server and then disk mirroring between the
>RAID5.
 
>Can anyone give me some ideas on the best approach and any problem that
>they can see ????

>Thanks in Advance

>David Cheung
>Please e-mail to hawkent_at_dircon.co.uk

Why would you mirror raid 5 volumes ?

If you're going to mirror, why not run raid 0+1, which is stripping plus mirroring without the performance penality on disk writes that raid 5 has. The advantage of raid 5 is so you don't have to buy duplicate disk drives. Received on Tue Oct 22 1996 - 00:00:00 CEST