Lower device (/dev/md3) is already mounted

[c4rdinal]

Hi!

Got this problem on Virtual Machine Replication & Failover with VMWare Server & Debian Etch (4.0) howto. Hope u can help me fix the problem.

Here's the portion which gave the error:

Linux:~# drbdadm up all
Lower device (/dev/md3) is already mounted
Command 'drbdsetup /dev/drbd0 disk /dev/md3 internal -1 --on-io-error=detach' terminated with exit code 20

My machine is currently at RAID 1.

Linux:~# fdisk -l

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 30 240943+ fd Linux raid autodetect
/dev/sda2 31 516 3903795 fd Linux raid autodetect
/dev/sda3 517 1732 9767520 fd Linux raid autodetect
/dev/sda4 1733 9707 64059187+ fd Linux raid autodetect

Disk /dev/sdb: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 30 240943+ fd Linux raid autodetect
/dev/sdb2 31 516 3903795 fd Linux raid autodetect
/dev/sdb3 517 1732 9767520 fd Linux raid autodetect
/dev/sdb4 1733 9707 64059187+ fd Linux raid autodetect

Disk /dev/md3: 65.5 GB, 65596489728 bytes
2 heads, 4 sectors/track, 16014768 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md3 doesn't contain a valid partition table

I understand that the Howto is using ext3 partition and it said it should not be mounted first. I know i have to unmount the RAID Partition. But what's the proper command/configuration in the drbd.conf to load it as RAID 1 partition. Is it possible?

Also, I'm using a Gigabit NIC. In the /etc/drbf.conf

syncer {
rate 1024M; # Use more if you have a Gigabit network. Speed is in Kylobytes. e.g.: 10M = 10Megabytes
group 1;

Tried rate 1024M but there's an error as follows:

:~# drbdadm up all
/etc/drbd.conf:17: rate 1024M => 1024000K out of range [1..700000]K.

How can I fix it? What the valid options?

Thank you so much and more power!

[c4rdinal]

Hi,

Got some progress here. Error regarding the RAID device is gone already. Here's what I did in case somebody encountered the same problem:

I uncommented the /etc/fstab RAID partition and made this entry:

/etc/drbd.conf

on server1.domain.com { # Use the EXACT hostname of your server as give by the command "uname -n"
device /dev/drbd0; # drbd device ID
disk /dev/md3; # physical disk device , check your partitioning scheme !!
address 192.168.1.200:7789;
meta-disk internal; # I use internal metadata storage
}
on server2.domain.com {
device /dev/drbd0;
disk /dev/md3;
address 192.168.1.100:7789;
meta-disk internal;
}

I followed the rest of the howto and everything worked fine. However when I shutdown the primary server I got this error:

drbd0: worker terminated
drbd0: unacked_cnt 1935
drbd0: Sorry, I have no access to good data anymore.
Kernel panic - not sysncing: drbd0: Sorry, I have no access to good data anymore.

Any idea?

Thank you and more power!

[falko]

This is all I could find: http://thread.gmane.org/gmane.linux.network.drbd/10550

[c4rdinal]

I'm sorry, I can't find anything there that may address my problems.

I noticed that the /var/vm is not really mounted /dev/drbd0

#fdisk -l
Disk /dev/md3: 65.5 GB, 65596489728 bytes
2 heads, 4 sectors/track, 16014768 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md2 9.2G 1.1G 7.7G 13% /
tmpfs 1011M 0 1011M 0% /lib/init/rw
udev 10M 76K 10M 1% /dev
tmpfs 1011M 0 1011M 0% /dev/shm
/dev/md0 228M 13M 204M 6% /boot


/dev/drbd0 should be mounted as /var/vm which is also my RAID /dev/md3. But my RAID device seem not mounted as can be seen above.

Any comments?