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Old 06-04-2007, 09:00 AM   #1
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RHEL3 - removing disks shifts LVM dev names downward?

Red Hat 3 (no udev, no devlabel)

If I have an LV with these member PV's:

--- Physical volumes ---
PV Name (#) /dev/sdj1 (1)
PV Status available / allocatable
Total PE / Free PE 268 / 0

PV Name (#) /dev/sdk1 (2)
PV Status available / allocatable
Total PE / Free PE 268 / 0

PV Name (#) /dev/sdn1 (3)
PV Status available / allocatable
Total PE / Free PE 267 / 0

If I remove the non-LVM disk /dev/sdm from the server,

1. at reboot, do you think that /dev/sdn will "move down" to be named /dev/sdm?

2. If so, will this break the LV?

LVM knows the PV UUID, so does it matter?

# pvdisplay /dev/sdn1
--- Physical volume ---
PV Name /dev/sdn1
VG Name u02vg
PV Size 8.40 GB [17623304 secs] / NOT usable 32.19 MB [LVM: 129 KB]
PV# 3
PV Status NOT available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 32768
Total PE 267
Free PE 0
Allocated PE 267
PV UUID 1LU9sk-9876-gdLi-D4Pw-LMNO-ABCD-123456
Old 06-04-2007, 09:46 AM   #2
Registered: Feb 2007
Location: Colorado
Distribution: FC6, FC7 x86_64
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The device names in the volume group does not matter at all. It is the PV UUID that are very important to the volume group. Those are unique identifiers that gets associated to each physical device. Even is the /dev/ names change because drives are added and/or removed the PV UUID are still attached to the drives. That way the volume group knows what drives belong to it even though the /dev/ names change around.

Old 06-04-2007, 11:58 AM   #3
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I was hoping that's how it would work.
If anyone else has firsthand experience confirming this, I'd certainly like to know. I'll set up a test instance, but wanted to make sure I was on the right track. Thanks!


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