DRBD
From DWIKI
Distributed Replicated Block Device
Links
- Homepage
- DRBD + pacemaker + NFS, pretty good doc
- Integrating DRBD with Pacemaker clusters
- https://www.sebastien-han.fr/blog/2012/08/01/corosync-rrp-configuration/
- Building a redundant pair of Linux storage servers using DRBD and Heartbeat
- [https://serverstack.wordpress.com/2017/05/31/install-and-configure-drbd-cluster-on-rhel7-centos7/
- http://www.asplund.nu/xencluster/page2.html
- Resizing resources
- http://www.linux-ha.org/wiki/Main_Page
- DRBD 8.3 Third Node Replication (stacked)
- Configure sync rate
- https://serverfault.com/questions/740311/drbd-terrible-sync-performance-on-10gige
See also: http://www.gluster.org/ and http://ceph.com/
Support
Tools
- LCMC, a GUI for managing LVM, DRBD in pacemaker environment]
- zabbix monitoring for drbd
drbdadm
drbd-overview
drbdsetup
Docs
- Resizing drbd xen lvm (dont worry about the meta-data if that's not internal) (bug it seems wrong, using phy: instead of drbd: )
- http://www.asplund.nu/xencluster/page2.html
Recovery
- Recovering from a DRBD split-brain scenario in heartbeat
- http://www.asplund.nu/xencluster/page2.html
- [https://docs.linbit.com/doc/users-guide-83/s-split-brain-notification-and-recovery/ Split brain notification and automatic recovery
- Troubleshooting DRBD on MediaCentral
GFS on DRBD
- http://sourceware.org/cluster/wiki/DRBD_Cookbook
- http://www.piemontewireless.net/Storage_on_Cluster_DRBD_and_GFS2
Cheatsheet
Make device primary
drbdadm primary yourdeviceID
or
drbdsetup /dev/drbdX primary -o
FAQ
sync is slow
show configuration
drbdsetup show
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
