[CentOS] using various IDE or SCSI hard drive interfaceswithCentOS Linux questions

[Seth Bardash]

On Thu, 2005-08-18 at 12:47, Robert Hanson wrote:

>  and so, if i load and config the 1850R with 4 scsi drives in raid5
array
> and get functional with CentOS, let's say i want to take all 4
drives and
> stuff them in correct order in a dl380 *cold*...
> 
> possibly different SCSI controllers.... yet nothing CentOS couldnt
handle
> IMHO...

First, most SCSI or SATA based RAID controllers put some, if not all.
the config info for the array on one or all of the drives. At boot
they load this info so they know how the array is set up. Each
different MFG uses a different table type to do this :( . With this
said, if your first RAID 5 controller is made by (pick one) LSI Logic
and you try to put these drives into a system with a (pick any other
one) adaptec controller you will have NO LUCK. 

Second, The only way your drive migration is going to be seamless
(really just move the drives and boot) is if:

1) RAID controllers are the same and running the same level of
firmware.
	
	different levels of firmware may store 
	different config parameters in a different 
	order - but might migrate ??

2) Same motherboard and chipset with same BIOS revision.

3) BIOS is set up identically so that the RAID array is the same
device and in the same position in the boot order.

	Swap is hard coded into fstab and if the array 
	is a different logical drive the O/S may not 
	be able to mount swap

This is not a Centos limitation, it's an operating system / BIOS /
boot sequence function.

Hope this helps


Seth Bardash

Integrated Solutions and Systems
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Colorado Springs, CO 80921

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