I'm able to address individual disks in RAID 1??

[Cody_Sparks at Dell.com]

Dave,

How did you determine that the "RAID controller detects that the disks
contain different data"?  Is this reflected in the TTY log or in
OpenManage?

--Cody

-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of David Sparks
Sent: Friday, August 25, 2006 2:34 PM
To: linux-poweredge-Lists
Subject: Re: I'm able to address individual disks in RAID 1??

> Buffer I/O error on device sdd2, logical block 585842179 Buffer I/O 
> error on device sdd2, logical block 585842176 Buffer I/O error on 
> device sdd2, logical block 585842177
...

The errors were caused by accidentally mounting sdb which is one of the
disks, not the RAID.

What I find concerning is that the RAID did not degrade, even though the
disks contain different data?  The situation appears to be:

- two disks in a RAID1: disk1, disk2
- disk1, disk2, and the RAID1 are all accessible through /dev/sd*
- changes are accidentally made directly to disk1
- RAID controller detects that the disks contain different data, but
- RAID does not degrade, controller continues in unknown state

Is this the expected behavior of this controller?

What is the point of RAID1 if the controller doesn't degrade the array
when it detects that the data on the disks differs?

Cheers,

ds

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