DRBD: Difference between revisions
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=Stacked resources= | =Stacked resources= | ||
*[https://docs.linbit.com/docs/users-guide-8.3/p-apps/ Using stacked DRBD resources in Pacemaker clusters] | |||
*[https://www.howtoforge.com/drbd-8.3-third-node-replication-with-debian-etch DRBD 8.3 Third Node Replication (stacked)] | *[https://www.howtoforge.com/drbd-8.3-third-node-replication-with-debian-etch DRBD 8.3 Third Node Replication (stacked)] | ||
*[https://www.suse.com/documentation/sle-ha-12/book_sleha/data/sec_ha_drbd_resource-stacking.html Resource stacking] | *[https://www.suse.com/documentation/sle-ha-12/book_sleha/data/sec_ha_drbd_resource-stacking.html Resource stacking] | ||
Revision as of 16:05, 26 April 2019
Distributed Replicated Block Device
Links
- Homepage
- DRBD + pacemaker + NFS, pretty good doc
- http://www.securityandit.com/system/pacemaker-cluster-with-nfs-and-drbd/
- 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
- Configure sync rate
- https://serverfault.com/questions/740311/drbd-terrible-sync-performance-on-10gige
- also tuning tips
- Debian DRBD: How to resize NFS on drbd volume on top of LVM
See also: http://www.gluster.org/ and http://ceph.com/
Stacked resources
- Using stacked DRBD resources in Pacemaker clusters
- DRBD 8.3 Third Node Replication (stacked)
- Resource stacking
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
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
- https://docs.linbit.com/doc/users-guide-83/s-resolve-split-brain/
- https://www.sebastien-han.fr/blog/2012/04/25/DRBD-split-brain/
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
