After
spending a little bit of time with the official process to convert a NetApp (Clustered)
ONTAP cluster to switchless cluster -
Transitioning to a two-node switchless cluster
- and encountering
strange issues (cluster unexpectedly going out-of-quorum), I decided to do it
my way (which is better - quicker and simpler - by the way). This is a very simple
9-step step-by-step process.
Image: Starting point: Using 2 cluster switches
1) Cluster checks
Verify
the cluster is healthy from the outputs of the below. Cluster LIFs should be on
their home ports and should be able to auto-revert. The cluster should be
healthy and ping-cluster should be all good. Check discovered-devices/CDPD to
ensure the cluster cabling is correct.
set -priv advanced
network options
switchless-cluster show
network interface show -role
cluster
network interface show -role
cluster -fields auto-revert
network port show -role
cluster
cluster show
cluster ping-cluster -node
{CLUSTER-01}
network device-discovery
show
2) Send ASUPs
system node autosupport
invoke -node * -type all -message "MAINT=1h BEGIN: Convert to
switchless"
3) Wait for the ASUPs to go
system node autosupport
history show -node CLUSTER-01
system node autosupport
history show -node CLUSTER-02
4) Enable switchless-cluster
network options
switchless-cluster show
network options
switchless-cluster modify -enabled true
network options
switchless-cluster show
Note: All this really does is instruct the
cluster to only check cluster communication down the direct connect paths, so disabling
the full-mesh checking which is only possible with cluster switches.
5) Un-cable cluster ports from
cluster switch 1 and direct connect
Image: Using a direct connect cable and Cluster
Switch 2
6) Cluster checks
Verify
the cluster is healthy. Verify the cluster ports are healthy. Wait for the Cluster
LIFs to auto-revert. After the cluster LIFs auto-revert, verify the cluster is
healthy. Finally check cluster communication with ping-cluster.
cluster show
network port show -role
cluster
network interface show -role
cluster
... WAIT for Cluster LIFs to
auto-revert ...
network interface show -role
cluster
cluster show
cluster ping-cluster -node
{CLUSTER-01}
7) Un-cable cluster ports from
cluster switch 2 and direct connect
Image: Using two direct connect cables
8) Cluster checks
Verify
the cluster is healthy. Verify the cluster ports are healthy. Wait for the Cluster
LIFs to auto-revert. After the cluster LIFs auto-revert, verify the cluster is
healthy. Finally check cluster communication with ping-cluster.
cluster show
network port show -role
cluster
network interface show -role
cluster
... WAIT for Cluster LIFs to
auto-revert ...
network interface show -role
cluster
cluster show
cluster ping-cluster -node
{CLUSTER-01}
9) Send ASUPs
system node autosupport
invoke -node * -type all -message "MAINT=END FINISHED: Convert to
switchless"
THE END
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