[CentOS] kickstart raid disk partitioning

Roberto Nunnari roberto.nunnari at supsi.ch
Fri Nov 19 10:34:29 EST 2010


Digimer ha scritto:
> On 11/19/2010 04:32 AM, Roberto Nunnari wrote:
>>> 1. http://wiki.alteeve.com/files/an-cluster/ks/generic_server_rhel6.ks
>>
>> Thank you for your reply.
>>
>> Does that kickstart effectly produces a partitioning that is
>> exactly the same on both disks? Because that is the problem
>> I'm facing: the partitioning produced by the kickstart
>> is different on the two drives.
> 
> Yup, both disks are identical layout.
> 
>> Also, why did you put /boot and swap in raid? Was it for
>> obtaining identical partitioning on both drives?
>> For swap, the kernel already does performance optimization
>> when swap partitions are on different drives, and /boot..
>> I always tended to keep /boot be as simple as possible, to avoid
>> any problem during boot.. but maybe, these days with initramdisk
>> there's no more need for that..
>>
>> Best regards.
>> Robi
> 
> Keeping the drives identical is a big part of it. Even on my 3+ disk 
> RAID level 5 systems, I make /boot a RAID 1 mirrored across all drives 
> as /boot can not be RAID5.
> 
> I mirror /boot and <swap> because if either is lost, the system dies. :) 
> Imagine if something was in swap, then swap vanished, and then the 
> system tried to retrieve what was in swap... Not so good. :P
> 
> The biggest concern is that, on /boot, you need to ensure that grub has 
> been setup on all drive's MBR. The grub shell allows you to ensure that.
> 

Thank you for the explanation. Now I have a good reason for swap
to be in raid1.

Best regards.
Robi


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