On Mon, Apr 13, 2015 at 3:10 PM, Konstantin Olchanski
<[log in to unmask]> wrote:
> On Mon, Apr 13, 2015 at 08:25:51AM -0400, Nico Kadel-Garcia wrote:
>> On Mon, Apr 13, 2015 at 8:10 AM, James M. Pulver <[log in to unmask]> wrote:
>> > I would point out that I'm not sure I've ever really seen the benefit of "Real Raid" except  for the vendor making more money. The only place I've used it is in iSCSI boxes that run everything in firmware.
>>
>> The ability to properly RAID the boot partition, with "/boot" on it, ...
>>
>
> I am not sure what you refer to. With SL5 and SL6 you have 2 disks,
> put "/" on a software RAID1 partitions put grub on both disks (grub,
> device (hd0) /dev/sda, root (hd0), setup, done; grub device (hd0) /dev/sdb,
> root (hd0), setup, done) and watch your machine boot from either disk -
> on need for separate "/boot", everything is "properly raided". All this is
> done automatically by the SL installer.

Until it fails. Grubby, along with the kernel installlation RPM,
doesn't know how to update, manage, or keep synchronized this second
/boot partition. Hilarity can then ensue, along with making sure that
your /etc/fstab doesn't detect the wrong disk and mount it incorrectly
as /dev/sda. See, if your first disk dies, unless you're very cautious
with /etc/fstab, it's very much a crapshoot if hte right partition
will mount as "/boot".

Been there, done that, gave up on the silliness.

> --
> Konstantin Olchanski
> Data Acquisition Systems: The Bytes Must Flow!
> Email: olchansk-at-triumf-dot-ca
> Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada