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If a subnet becomes unreachable and trying to ping the problematic IP's on the Isilon CLI shows the following, you may have a static route set incorrectly:
isi-cluster2-1# ping 10.10.11.78
PING 10.10.11.78 (10.10.11.78): 56 data bytes
ping: sendto: Invalid argument
ping: sendto: Invalid argument
ping: sendto: Invalid argument
Cause
This issue may be observed if a pool static route is set to be the same as the subnet interface route
isi-cluster2-1# isi network pools view groupnet0.subnet0.Repln_pool
ID: groupnet0.subnet0.Repln_pool
Groupnet: groupnet0
Subnet: subnet0
Name: Repln_pool
Rules: -
Access Zone: System
Allocation Method: static
Aggregation Mode: lacp
SC Suspended Nodes: -
Description: Used for repln-1G interfaces
Ifaces: 1:mgmt-1, 2:mgmt-1, 3:mgmt-1, 4:mgmt-1
IP Ranges: 10.10.11.25-10.10.11.28
Rebalance Policy: auto
SC Auto Unsuspend Delay: 0
SC Connect Policy: round_robin
SC Zone:
SC DNS Zone Aliases: -
SC Failover Policy: round_robin
SC Subnet: subnet0
SC TTL: 0
Static Routes: 10.10.11.0/24-10.10.11.1 <<<<< Remove this static route and test
NFSv3 RDMA RRoCE only: No
isi-cluster2-1# isi network subnets list -v
ID: groupnet0.subnet0
Name: subnet0
Groupnet: groupnet0
Pools: pool0, Repln_pool
Addr Family: ipv4
Base Addr: 10.10.11.0 <<<<< Pool static route should not match this
CIDR: 10.10.11.0/24
Description: Initial subnet
DSR Addrs: -
Gateway: 10.10.11.1
Gateway Priority: 1
MTU: 1500
Prefixlen: 24
Netmask: 255.255.255.0
SC Service Addrs: 10.10.11.82-10.10.11.82
SC Service Name: isi-cluster2-mgmt-ssip.gmhpost.com
VLAN Enabled: False
VLAN ID: -
Resolution
Remove the static route in the subnet's pool and test connectivity.
