[CentOS] /dev/sd and /dev/mapper
Ljubomir Ljubojevic
office at plnet.rs
Fri Jun 24 15:23:50 UTC 2011
Alexander Dalloz wrote:
> 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
Instead of fake-raid controller, I suggest software RAID via mdadm
(Linux md).
Ljubomir
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