RE: Raid 0+1 or Raid 1+0

Serious typo there isn't there?

What I meant to say

0+1 = 50%

1+0 = 10%

And I also meant to say that it was on reads.

Write speed would be nearly the same ( I think ).

Jared

"Stephen Andert" <StephenAndert_at_firsthealth.com>  05/22/2003 02:33 PM  

        To:     ORACLE-L_at_fatcity.com, Jared.Still_at_radisys.com
        cc: 
        Subject:        RE: Raid 0+1 or Raid 1+0

Jared,

Which is it? lose 10% or 50% for 0+1? I think one of your statements should say 1+0. If I think hard enough or open a book, I could probably correct it, but I thought that sounded like too much work :)

Stephen

>>> Jared.Still_at_radisys.com 05/22/03 12:17PM >>> With RAID 0+1 you immediately lose 50% of your IO capacity when a drive fails. With a 10 disk RAID 0+1 setup, you lose 10% of your IO capacity with a drive failure.

Stephen Lee <Stephen.Lee_at_DTAG.Com>
Sent by: root_at_fatcity.com
 05/22/2003 07:41 AM
 Please respond to ORACLE-L  

        To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>

        cc: 
        Subject:        RE: Raid 0+1 or Raid 1+0

I wonder if there would be some difference in write speed with one versus
the other. The only thing I ever played with was stripe then mirror. Stripe then mirror was never a problem for me because I didn't wait around
for another drive to fail. Most software and hardware that does this also
allows you to set up hot spares.

> -----Original Message-----
> Hi all
>
> Some documents I read says use RAID 0 + 1 but then if you look at
what
> happens when a single drive fails you switch over to the
> other side of the
> raid, thus you can only tolerate 1 drive failure before a second
drive
> failure brings the storage system down,
>
> Raid 0 + 1 = Stripe + Mirror which equates to Oracle SAME
methodology
>
> Whereas
>
> Using Raid 1 + 0 gives the same performance but you can
> handle multiple
> drive failures.
>
> Views and comments please.
>

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