[CentOS] /dev/sd and /dev/mapper
Alexander Dalloz
ad+lists at uni-x.org
Fri Jun 24 12:35:33 UTC 2011
Am 24.06.2011 14:24, schrieb Steve Campbell:
> I've done a little research, and can't really find out why it happens,
> but on one server I have built, I get the old fashion /dev/sda1,
> /dev/sda2 type partitions and on another server I get the /dev/mapper
> style partitions. Both machines are hardware raided (before the install)
> and both machines are Centos 5.5 64 bit, using the same set of CDs to
> install from.
>
> Can someone please explain why this happens? I'm not sure it matters, so
> this is just a curious bother. The machines are different brands with
> different raid controllers. Both were partitoned using the "custom
> layout" when installed. I'm thinking I must have overlooked a checkbox
> or something during the install.
>
> This is not a big deal, not a problem, it's just an itch in my brain.
>
> Thanks for any explanation.
>
> steve campbell
The machine with the /dev/sda has a true hardware RAID controller. The
machine with a /dev/mapper device has just a fake RAID controller, thus
a dm-raid device.
Alexander
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