[DRBD-user] LVM+DRBD+LVM

Robinson, Eric eric.robinson at psmnv.com
Sun Oct 12 17:38:32 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On two Centos 5.2 (2.6.18-92.1.10.el5) servers, I did the following:
 

	created logical partition /dev/sda5
	created PV, volume group VG01, and logical volume LV01
	created drbd resource with the following options:

		device     /dev/drbd0;
		disk       /dev/vg01/lv01;
		

This worked fine. Server 1 is now primary, server 2 is secondary, both
are up to date.
 
When trying to prepare my DRBD resource for use as a PV, I issued the
command:
 

	pvcreate /dev/drbd0

 
And got:
 

	Failed to write physical volume "/dev/drbd0"

 
I ran:
 

	parted -l

 
And got:
 

	Number  Start   End     Size    Type      File system  Flags
	 1      32.3kB  83.9GB  83.9GB  primary   ext3
	 2      83.9GB  92.5GB  8587MB  primary   linux-swap
	 3      92.5GB  92.6GB  123MB   primary   ext3         boot
	 4      92.6GB  1198GB  1105GB  extended               lba
	 5      92.6GB  1198GB  1105GB  logical
	
	Error: Unable to open /dev/md0 - unrecognised disk label.
	

I ran fdisk, looked at the partition tables, and quit without saving
changes.
 
Then I tried parted again and got:
 

	Number  Start   End     Size    Type      File system  Flags
	 1      32.3kB  83.9GB  83.9GB  primary   ext3
	 2      83.9GB  92.5GB  8587MB  primary   linux-swap
	 3      92.5GB  92.6GB  123MB   primary   ext3         boot
	 4      92.6GB  1198GB  1105GB  extended               lba
	 5      92.6GB  1198GB  1105GB  logical
	 
	

	Error: Unable to open /dev/drbd0 - unrecognised disk label.
	 
	Error: Unable to open /dev/md0 - unrecognised disk label.
	

NOTE: Now there's two unrocognized disk labels, one of which is drbd0.
 
So then I tried the command again:
 

	pvcreate /dev/drbd0

 
And got:
 

	Physical volume "/dev/drbd0" successfully created

 
What the heck?


--
Eric Robinson
Director of Information Technology
Physician Select Management, LLC
775.885.2211 x 111

 


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