Mark,

It's actually worse than that.  For a striped volume with no
fault-tolerance, the overall reliability is the product of the individual
reliability factors.  For example, if you have 10 disks and each has a 99%
reliability rating, the overall reliability of a RAID-0 volume spanned
across all 10 disks is 0.99 ^ 10 = 0.9044.  In other words, that RAID-0
volume is just 90% reliable.

I never use RAID-0 for anything critical.  If all you want is a "big
bucket" and loss of the data isn't that big a deal, then it's a suitable
choice.

Tab Trepagnier
TSM Administrator
Laitram, L.L.C.








"Stapleton, Mark" <mark.stapleton AT BERBEE DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
07/21/2004 08:41 AM
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Re: storage pool raid 1?


From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On
Behalf Of Mike Eggleston
>Sorry about the raid1, I meant raid0 (striping). I'm on AIX 5.2.

I would *never* do just striping. There is no fault tolerance in that
case; loss of one disk means loss of all data on all disks.

--
Mark Stapleton