DRBD

From DWIKI

Distributed Replicated Block Device


Links

See also: http://www.gluster.org/ and http://ceph.com/

Support

Tools

drbdadm

drbd-overview

drbdsetup

Docs

Recovery

GFS on DRBD


Cheatsheet

Make device primary

drbdadm primary yourdeviceID

or

drbdsetup /dev/drbdX primary -o


Grow resource

On both nodes:

lvextend -L+10G /dev/DRBD/myresource

On one node:

drbdadm resize myresource

FAQ

1: State change failed: (-2) Need access to UpToDate data

when you get that tryinng to make a node/resource primary, try

drbdadm primary drbdX --force


show resource sizes

lsblk

commands to show info

drbdmon
drbdtop


resolving split brain issues

diskless

You might try

drbdadm attach drbd0


sync is slow

Show current settings:

drbdsetup show


On secondary:

drbdadm disk-options --c-plan-ahead=0 --resync-rate=50M drbd0and 

and to reset after sync:

drbdadm adjust drbd0

show configuration

drbdsetup show


show more info

drbdsetup show-gi <minor-number>

update network settings

drbdsetup net-options 10.0.0.1 10.0.0.2  --sndbuf-size=2M


mount: unknown filesystem type 'drbd'

Usually means your node is not primary. If you're sure you know what you're doing you can use

mount -t ext4 /dev/drbd1 /drbdmount

reload configuration

drbdadm adjust all


show configuration of resource

drbdsetup /dev/drbd0 show


resource unknown

First try

drbdadm up resourcename

Command 'drbdmeta 1 v08 /dev/drbd0 internal apply-al' terminated with exit code 20

Most likely split brain issue, check dmesg etc