You can allow writes and run resync-prep using the API with the /platform/7/sync/jobs URI. You can check out the help for this URI at /platform/7/sync/jobs?describe. Allow writes:       Resync Prep: 
Hi,  We have requirement from customer to develop script to trigger failover/failback of SyncIQ policies in Isilon using REST API. I was reading the REST API 8.2.2 guide and could not see any API call to enable writes on target policy and resync-prep on the source cluster SyncIQ policy.  Can I confirm if these operations are not supported by REST API ?  Thanks.Desmond
REST API for SyncIQ - Failover/Failback