- Red Hat Enterprise Linux Server 8 (with the High Availability Add-On)
- How can I create a resource in cluster to manage VDO device ?
- Create a VDO device over a shared storage
# multipath -ll mpathb (360014053a0ff9304b20436d96cd83816) dm-4 LIO-ORG,2node_rhel8-3 size=10.0G features='0' hwhandler='1 alua' wp=rw |-+- policy='service-time 0' prio=50 status=active | `- 3:0:0:2 sde 8:64 active ready running `-+- policy='service-time 0' prio=50 status=enabled `- 4:0:0:2 sdg 8:96 active ready running
- Create a VDO device:
[root@rh8-nd1 ~]# vdo create --name=vdo_test --device=/dev/mapper/mpathb --vdoLogicalSize=30G Creating VDO vdo_test Starting VDO vdo_test Starting compression on VDO vdo_test VDO instance 0 volume is ready at /dev/mapper/vdo_test [root@rh8-nd1 ~]# vdostats Device 1K-blocks Used Available Use% Space saving% /dev/mapper/vdo_test 10481664 4194456 6287208 40% 0%
NOTE: With the command
vdo create, it creates a file
/etc/vdoconf.yml locally on the node on which the command was executed.
- Stop & Disable the VDO service on all the cluster nodes:
# systemctl stop vdo.service; systemctl disable vdo.service
scpof the yml file which got created over to other cluster members (The default location is
Create a VDO resource using
# pcs resource create vdo vdo-vol config="/etc/vdoconf.yml" volume="vdo_test"
- Validate the status of cluster
# pcs resource status vdo (ocf::heartbeat:vdo-vol): Started node2 # pcs resource config vdo Resource: vdo (class=ocf provider=heartbeat type=vdo-vol) Attributes: config=/etc/vdoconf.yml volume=vdo_test Operations: monitor interval=10s start-delay=10s timeout=20s (vdo-monitor-interval-10s) start interval=0s timeout=60s (vdo-start-interval-0s) stop interval=0s timeout=60s (vdo-stop-interval-0s)
- Perform a failover test so as to confirm that the resource gets started on member node as well.
- For more details over resource agent
vdo-vol, please refer to below command:
# pcs resource describe vdo-vol
- Red Hat Enterprise Linux
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