CentOS docs - Apr 2009 - Updated How to Setup a Software RAID on CentOS 5

I have attempted to address all comments:

http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5

Give me your best shot! :-D

Phil

Phil Schaffner wrote:
> I have attempted to address all comments:
> 
> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
> 
> Give me your best shot! :-D
> 
> Phil
> 
Nice job Phil :)

/remembering my disclaimer/ I'm not a raid/grub expert...

Presumably Section two is required because grub is installed to the mbr 
of /dev/sda so /dev/sdb isn't bootable in the event /dev/sda should fail?

Would using grub be simpler rather than directly editing 
/boot/grub/device.map ? Something like...

Following on from Section 1, reboot...

Stop at the grub menu and enter the "c" option, which gives you the
grub
prompt. Then:

grub> device (hd0) /dev/sda
grub> root (hd0,0)
grub> setup (hd0)
grub> device (hd1) /dev/sdb
grub> root (hd1,0)
grub> setup (hd1)
grub> exit

and test both disks are bootable. Achieves the same thing I guess.

Dear Phil.
> I have attempted to address all comments:
>
> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
>
> Give me your best shot! :-D
Much better now. You have already addressed most of the issues. Here
are some comments, still:

You wrote: 'usually either ATA or SATA'

please add SCSI here, too.

...

If you are planning to setup a RAID1, I still wonder why not to place
/boot on a raid partition?

...

Could you please name 'Section X' to something more common, e.g.
'Basic Installation Instructions', 'Bootloader Setup' ...

Best Regards
Marcus

From: "Phil Schaffner", Tuesday, April 28, 2009 5:36 PM
>I have attempted to address all comments:
>
> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
>
> Give me your best shot! :-D
>
> Phil
  There's always going to be an argument about whether to put /boot and swap
on RAID.  It's all about performance most of the time being slightly better 
versus stability in the event of device failure.

  What's the disaster recovery plan here?

  Obviously, if the second drive fails, there's no issue.  Standard removal 
and eventual addition of replacement device(s).

  If the first drive fails, are we hoping the computer will boot off the 
second drive or are we moving the second drive to the first interface?

  Is it outside the scope of this document to describe and test disaster 
recovery?  I think it is.  I'm just making a note to suggest a further 
complimentary page at some time in the future...  (though, at this time, I 
am NOT volunteering to write it)  Is there a wiki page todo list somewhere?