Cannot Remove device links

[kaari]

Hi All,

I have a HP DL 180 server with two 750 GB HDDs and one 1TB HDD.
Two 750s in RAID of 1+0 and other 1TB hard disk I plugged in later
with RAID 0

I have installed Oracle VM server (3.0.3) on first RAID device (which
is 1+0) and other device left untouched.

When i logged in to the system and do the fdisk -l, following is the
result.

[root@ovm1 ~]# fdisk -l

Disk /dev/sdb: 1000.1 GB, 1000171331584 bytes
255 heads, 63 sectors/track, 121597 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

Disk /dev/sda: 750.1 GB, 750122819584 bytes
255 heads, 63 sectors/track, 91197 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 405 3148740 83 Linux
/dev/sda3 406 536 1052257+ 82 Linux swap /
Solaris

Disk /dev/dm-0: 1000.1 GB, 1000171331584 bytes
255 heads, 63 sectors/track, 121597 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

I tried to create a physical disk using fdisk /dev/sdb
but i can't do

pvcreate /dev/sdb1 and it continuously giving following error.

==================fdisk -l after creating disk /dev/sdb========

[root@ovm1 ~]# fdisk -l

Disk /dev/sdb: 1000.1 GB, 1000171331584 bytes
255 heads, 63 sectors/track, 121597 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 121597 976727871 83 Linux

Disk /dev/sda: 750.1 GB, 750122819584 bytes
255 heads, 63 sectors/track, 91197 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 405 3148740 83 Linux
/dev/sda3 406 536 1052257+ 82 Linux swap /
Solaris

Disk /dev/dm-0: 1000.1 GB, 1000171331584 bytes
255 heads, 63 sectors/track, 121597 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/dm-0p1 1 121597 976727871 83 Linux

=====================================

[root@ovm1 ~]# pvcreate /dev/sdb1
Can't open /dev/sdb1 exclusively. Mounted filesystem?

============dmsetup information====================


[root@ovm1 ~]# dmsetup info
Name: 3600508b10010503953585a5237571000
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 253, 0
Number of targets: 1
UUID: mpath-3600508b10010503953585a5237571000 <-----the 1TB HDD with
RAID 0


[root@ovm1 ~]# dmsetup ls
3600508b10010503953585a5237571000 (253, 0)


==================================================

[root@ovm-srv1 ~]# cat /etc/lvm/cache/.cache
# This file is automatically maintained by lvm.

persistent_filter_cache {
valid_devices=[
"/dev/disk/by-label/boot1",
"/dev/disk/by-id/scsi-3600508b10010503953585a5237570e00-part2",
"/dev/disk/by-label/SWAP-sda3",
"/dev/disk/by-id/scsi-3600508b10010503953585a5237570e00-part3",
"/dev/disk/by-uuid/66076bca-0742-4b72-841c-1315f0e21970",
"/dev/disk/by-label/1",
"/dev/sdb",
"/dev/disk/by-id/scsi-3600508b10010503953585a5237570e00-part1",
"/dev/disk/by-path/pci-0000:06:00.0-scsi-0:0:1:0",
"/dev/disk/by-uuid/8cfe10d0-4013-45df-8d33-087c81c37559",
"/dev/sda1",
"/dev/sdb1",
"/dev/disk/by-path/pci-0000:06:00.0-scsi-0:0:0:0-part1",
"/dev/disk/by-path/pci-0000:06:00.0-scsi-0:0:0:0-part3",
"/dev/root",
"/dev/sda2",
"/dev/disk/by-uuid/ed77d3d0-a055-4024-b0d5-c4a1301145a6",
"/dev/disk/by-path/pci-0000:06:00.0-scsi-0:0:0:0-part2",
"/dev/disk/by-uuid/d9f0da21-7ccf-4ffd-889d-6590ec45382c",
"/dev/sda3"
]
}


I tried to remove the entries related to /dev/dm-0 but every time i
reboot the server it rewrite it to the .cache file.

Also i tried to remove the /dev/dm-0 by

dmsetup remove <1tb_device>
but again when i reboot the server it'll write again.

I want to create NFS share using this 1TB hdd but with this entry (/
dev/dm-0) i cannot create a physical volume; even a logical volume for
that matter.

I tried to create a partition using /dev/dm-0 but ended up with the
same.

Please some one can help me with this wold be a great help.

Thanks you very very much in advance..


Regadrs

[Prabu]

have you tried to stop multipathd service?