Switch between active/pasive

[Toni Bizjak]

I've realised "Idea Nr. n+1:" and, it works.

My demo-system:
Two DSS Nodes with Eth addresses:
PRI (SEC)
192.168.0.115 (113)
192.168.101.115 (113) Virtual IP 20.0.1.13
192.168.102.115 (113) Virtual IP 20.0.2.13
192.168.110.115 (113) for Vol.Replication

ESXi5.0 as client:
Created VMKernel ports:
- 192.168.101.5 and 192.168.102.5 as PingNodes and "assisting ports"
- 20.0.1.5 and 20.0.2.5 for paths to Virtual IP.
All the time, Win VM is occupied with transfer data between two LUNs, created on tested DSS.

Cookbook tips (at your own risk!!!):

1. Setup Failover on both DSS and MPIO connection to ESXi. Test, if all works. Do not use Deny/Allow access for iSCSI targets.

2. Manual Failover PRI.
Virtual IP is still active. On SEC, Volume replication mode is switched to Source, so iSCSI targets are visible from ESXi, now.

3. On ESXi:
Add physical IPs of SEC (192.168.101.113 & 192.168.102.113).
Refresh all paths - 20.0.x.13 and 192.168.10x.113 should be active (I/O).

4. Stop Failover service on PRI.
On ESXi, paths 20.0.x.13 are "dead", but paths 192.168.10x.113 are still active (I/O).

5. Remove Replication tasks, used with Failover services

6. Uncheck "Enable Failover functionality" on PRI and SEC

7. On PRI select "Secondary node on localhost" and enter 192.168.0.113.

8. On SEC select "Primary node on localhost", as "Secondary node IP" enter 192.168.0.115 and as Ping node IP(s) enter 192.168.101.5 and 192.168.102.5

9. Select "Enable Failover functionality" on PRI (now NSEC) and SEC (now NPRI)

10. Create new volume replication tasks on NPRI and start them. In Failover Tasks, move them in the right window. (In my case, works aslo without “clear metadata”).

11. Start Failover on NPRI

12. On ESXi, refresh paths.
Paths 20.0.x.13 are active (I/O), also 192.168.10x.113 are active (I/O).
Remove all 192.168.x.113 paths. Prepare "Deny/Allow access" for iSCSI 20.0.x.13 targets.

13. A little pray during such operations, is said, helps even those who do not believe. Backup before, is said, helps also to those who believe.

Maybe, all this is already written somewhere, but I didn't notice. Someone could prepare Webinar on this topic?