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-   -   Device Mapper and unknown device. (http://www.linux-archive.org/device-mapper-development/325543-device-mapper-unknown-device.html)

Saito Jun 02-13-2010 02:19 PM

Device Mapper and unknown device.
 
Hello everybody professional.
I am embarrassed.
What is this /dev/dm-1?
The cylinder is different though it is the same capacity.
And I newly made LUN.

-------------------------
[root@ns01 ~]# fdisk -l
This doesn't look like a partition table
Probably you selected the wrong device.
dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 1305 10482381 7 HPFS/NTFS

Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 * 1 1305 10482381 7 HPFS/NTFS

Disk /dev/dm-0: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/dm-0p1 * 1 1305 10482381 7 HPFS/NTFS

Disk /dev/dm-1: 10.7 GB, 10733958144 bytes
255 heads, 63 sectors/track, 1304 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

This doesn't look like a partition table
Probably you selected the wrong device.

Device Boot Start End Blocks Id System
/dev/dm-1p1 ? 10499 10499 0 65 Novell Netware 386
Partition 1 does not end on cylinder boundary.
/dev/dm-1p2 ? 13578 119522 850995205 72 unknown
Partition 2 does not end on cylinder boundary.
/dev/dm-1p3 ? 45382 79243 271987362 74 unknown
Partition 3 does not end on cylinder boundary.
/dev/dm-1p4 167628 167631 25817+ 0 empty
Partition 4 does not end on cylinder boundary.
---------------------------------


It explains the procedure.
--------------------
My Environment
/dev/sda [LocalDisk]
/dev/sdb [SAN External Disk]
/dev/sdc [SAN External Disk]

Configure Multipath
Edit /etc/multipath.conf
/etc/init.d/multipathd

Create Partition
fdisk /dev/sdb

Create Multipath block device
kpartx -a /dev/mapper/mpath0

Create File System
mke2fs -j /dev/mapper/mpath0p1

Mount
mount -t ext3 /dev/mapper/mpath0p1

Question
ls /dev/dm-1
---------------------

Regards,

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02-13-2010 07:57 PM

Device Mapper and unknown device.
 
Find the major/minor number of /dev/dm-1 (most likely 253,1). Then run
"dmsetup table --major <major> --minor <minor>".

It is most likely same as your mpath0p1

Or see the major/minor of mpath0p1.

Thanks, Malahal.

Saito Jun [cartman@mbs.sphere.ne.jp] wrote:
> Hello everybody professional.
> I am embarrassed.
> What is this /dev/dm-1?
> The cylinder is different though it is the same capacity.
> And I newly made LUN.
>
> -------------------------
> [root@ns01 ~]# fdisk -l
> This doesn't look like a partition table
> Probably you selected the wrong device.
> dev/sdb: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 * 1 1305 10482381 7 HPFS/NTFS
>
> Disk /dev/sdc: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdc1 * 1 1305 10482381 7 HPFS/NTFS
>
> Disk /dev/dm-0: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/dm-0p1 * 1 1305 10482381 7 HPFS/NTFS
>
> Disk /dev/dm-1: 10.7 GB, 10733958144 bytes
> 255 heads, 63 sectors/track, 1304 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> This doesn't look like a partition table
> Probably you selected the wrong device.
>
> Device Boot Start End Blocks Id System
> /dev/dm-1p1 ? 10499 10499 0 65 Novell Netware 386
> Partition 1 does not end on cylinder boundary.
> /dev/dm-1p2 ? 13578 119522 850995205 72 unknown
> Partition 2 does not end on cylinder boundary.
> /dev/dm-1p3 ? 45382 79243 271987362 74 unknown
> Partition 3 does not end on cylinder boundary.
> /dev/dm-1p4 167628 167631 25817+ 0 empty
> Partition 4 does not end on cylinder boundary.
> ---------------------------------
>
>
> It explains the procedure.
> --------------------
> My Environment
> /dev/sda [LocalDisk]
> /dev/sdb [SAN External Disk]
> /dev/sdc [SAN External Disk]
>
> Configure Multipath
> Edit /etc/multipath.conf
> /etc/init.d/multipathd
>
> Create Partition
> fdisk /dev/sdb
>
> Create Multipath block device
> kpartx -a /dev/mapper/mpath0
>
> Create File System
> mke2fs -j /dev/mapper/mpath0p1
>
> Mount
> mount -t ext3 /dev/mapper/mpath0p1
>
> Question
> ls /dev/dm-1
> ---------------------
>
> Regards,
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel


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