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Old 01-24-2008, 11:31 AM   #1
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Registered: Nov 2007
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missing LVM block device on RHEL50

I've created a Logical Volume on an iSCSI disk, but I cannot format it because the block does not appear to have been created. Anyone got any clues? Prior to creating the LV, I was able to directly partition and format /dev/sdb. I know that LVM starts before iscsi, so I'm guessing that the problem is that /dev/sdb isn't present when the block device creation occurs and thus /dev/VGiSCSI doesn't get created.

Here is the relevant output:
[tule]cae# pvdisplay
--- Physical volume ---
PV Name /dev/sdb
PV Size 1000.00 GB / not usable 1.00 GB
Allocatable yes (but full)
PE Size (KByte) 1048576
Total PE 999
Free PE 0
Allocated PE 999
PV UUID EM7Kea-p0zJ-ymxU-7fvR-X3R2-g3sv-egSGJM

[tule]cae# vgdisplay
--- Volume group ---
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 999.00 GB
PE Size 1.00 GB
Total PE 999
Alloc PE / Size 999 / 999.00 GB
Free PE / Size 0 / 0
VG UUID IerI8S-ohO4-KH4L-20v0-6YF8-fGnw-2XWOPK

[tule]cae# lvdisplay
--- Logical volume ---
LV Name /dev/VGiSCSI/LV0
LV UUID 9PpVZ9-6jWj-H1ds-DiD2-RBWR-QBWh-AgA44v
LV Write Access read/write
LV Status NOT available
LV Size 999.00 GB
Current LE 999
Segments 1
Allocation inherit
Read ahead sectors 0

[tule]cae# ls /dev/V*
ls: /dev/V*: No such file or directory

Old 01-24-2008, 04:09 PM   #2
Registered: Sep 2003
Location: Sydney Australia
Distribution: Redhat, Centos, Solaris, Ubuntu, SUSE
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Dont know if this would help but you could de-activate the volume group and then re-activate it, see vgchange. I think that vgchange creates the /dev entries as it detects the volume groups.
Old 01-24-2008, 04:30 PM   #3
Registered: Sep 2003
Location: Sydney Australia
Distribution: Redhat, Centos, Solaris, Ubuntu, SUSE
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Try this : vgmknodes
Old 01-24-2008, 04:58 PM   #4
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FragInHell gets the bump:

[tule]~# modprobe dm-mod
[tule]~# vgchange -ay
1 logical volume(s) in volume group "VGiSCSI" now active
[tule]~# ls /dev/V*

I was following the official RedHat documentation on this, and they've evidently left bits out.


iscsi, lvm2, rhel5

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