[CentOS] Order of sata/sas raid cards

Thu Aug 23 14:09:47 UTC 2012
Adrian Sevcenco <Adrian.Sevcenco at cern.ch>

On 08/23/12 15:01, Jobst Schmalenbach wrote:
> Hi Adrian

> yes this will do.
> Because I do not know (yet) the UUID of the new partitions (drives), 
> if I specify the UUID for the known drives for the partitions
> the kernel will assign the new drives to higher sdx?
AFAIK the sdX names are given by the bios so this is why when new
hardware is addend and/or something is change hardware-wise the sdX
nomenclature is changed.
If you decide to use UUID nomenclature you should use it for ALL
disks/partitions .. for centos that menas the beside fstab to modify
grub to have something like root=UUID= in kernel command line from grub.
IMHO the easiest way to change all to UUID is to boot a live-cd find out
all UUIDs and modify the fstab and grub accordingly.
I dont know about root(hd0,0) .. i have the grub and / installed on an
disk which by system is recognized as /dev/sdc and in grub.conf i have


> Is this correct?
> thanks
> Jobst
> On Thu, Aug 23, 2012 at 12:49:38PM +0300, Adrian Sevcenco (Adrian.Sevcenco at cern.ch) wrote:
>> On 08/23/12 12:13, Jobst Schmalenbach wrote:
>>> Is there a way to tell the kernel in which order to load the drives
>>> and assign the drive order in a way that the new drives are assigned
>>> SDC and SDD and the old drives get SDA and SDB?
>> use UUID= in fstab (lsblk -o NAME,KNAME,UUID) and you will get rid of
>> all this headaches (if you have software raid the assembling is done
>> internally based on UUID so you don't have to worry about mdraid)
>> HTH,
>> Adrian
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