Re: Wrong partition device naming scheme

[Curtis Gedak]

This problem also exists for motherboard BIOS RAID, also known as FAKE 
RAID.  As such I think that this partition naming problem is common to 
all device mapper entries (LVM2, DMRAID).


When using parted (v2.3) on an ASUS P5B-E motherboard with Intel Chipset 
Raid ICH8R, parted appears to always append the letter "p" followed by 
the partition number to the device name to arrive at the partition name.

I believe that the general rule of thumb for naming partitions is as 
follows:

A)  If the device name ends in a number, then append the letter "p" and 
the partition number to create the partition name.

B)  If the device name does not end in a number, then append the 
partition number only to create the partition name.


From previous experience with the dmraid command, I think that it too 
violates the general rule of thumb for naming partitions.  Specifically 
dmraid seems to only append the partition number, even if the device 
name ends in a number.  A work around to this problem is to use the 
kpartx command to create the appropriately named device entries.

Regards,
Curtis Gedak

Hadmut Danisch wrote:
> Hi,
>
> when creating a partition table and partitions in a Linux logical volume
> (to be used as a virtual hard disk for qemu), e.g.
> /dev/mapper/vg-disk, then parted automatically creates partition entries
> like /dev/mapper/vg-diskp1, ..p2, and so on.
>
> These partition entries are incompatible with other linux uses, e.g.
> grub expects the usual scheme where just 1,2,3 (without p) is appended
> to the base device name.
>
> regards
> Hadmut
>
>
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