Re: RAID -v- Mirroring (was New RAID-5 algorithm on V4R5 ?)

["Charly Jones" <charly301@xxxxxxxxxxx>]

>
>   As for RAID -v- Mirroring, We sell virtually 100% RAID.  It's cheaper
>and the protection is adequate for most users needs.  However, Mirroring
>does provide better protection and it can be substantially better if
>enough equipment is purchased.  It also will perform better in a Read
>Intensive environment and some will argue (here's where we'll probably
>hear from the Geezer in Gig Harbor) that even in a write intensive
>invironment it is better.
>

ok.  I'll respond.  If you insist.  When you are in a write intensive
environment, and you overrun your write cache, the performance of
mirrored disks is significantly better than RAID disks.  You may not
think you would ever have this problem, but how would you know even
if you did?  I have seen this situation with journal receivers on
systems where they were journalling a lot of stuff.

Charly

===========================================================
Charly Jones
Geezer in Gig Harbor
IBM Certified Specialist - AS/400 Administrator
===========================================================

_____________________________________________________________________________________
Get more from the Web.  FREE MSN Explorer download : http://explorer.msn.com

+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---