Re: who creates 'dev/mapper/vgHDB-HDB9'?

[Tom H <tomh0665@gmail.com>]

On Tue, May 3, 2011 at 12:41 PM, Hugo Vanwoerkom <hvw59601@care2.com> wrote:
>
> I have installed lvm2 and created pv's, vg's and lv's. E.g.:
>
> root@Debian:/home/hugo# lvdisplay
>  --- Logical volume ---
>  LV Name                /dev/vgHDB/HDB3
>  VG Name                vgHDB
>  LV UUID                SCHlBs-acvc-FLzz-TgwV-0IGX-aXBM-AdbPsB
>  LV Write Access        read/write
>  LV Status              available
>  # open                 0
>  LV Size                12.00 GiB
>  Current LE             3072
>  Segments               1
>  Allocation             inherit
>  Read ahead sectors     auto
>  - currently set to     256
>  Block device           254:1
>
> ...
>
> and blkid says:
>
> ...
> /dev/mapper/vgHDB-HDB3: LABEL="HD502HJ.03"
> UUID="b12819b7-8f07-4bf6-af66-9bb9410536a1" TYPE="ext2"
> /dev/mapper/vgHDB-HDB7: LABEL="HD502HJ.07"
> UUID="c889aa6c-e0c3-4954-b8fe-b87d257c1cc6" TYPE="ext2"
> /dev/mapper/vgHDB-HDB5: LABEL="HD502HJ.05"
> UUID="18027b86-2b1f-4e24-ab5a-eb56ba0509c9" TYPE="ext2"
> /dev/mapper/vgHDB-HDB6: LABEL="HD502HJ.06"
> UUID="238dd5dc-012f-46e1-b680-84dbe9287d2b" TYPE="ext2"
> /dev/mapper/vgHDB-HDBB: LABEL="HD502HJ.0B"
> UUID="d7bc3d22-238a-47d4-86c8-6aa3384404e5" TYPE="ext2"
> ...
>
> I have a question: who creates exactly those /dev/ entries?
>
> The reason I ask is that sometimes with mondorescue they are not created and
> I cnnot access the lv's.

I think that it's dmsetup - or a combination of dmsetup and udev.