Grass Valley K2 (Summit 3G) 10Gv2 Storage Area Network Installation v.8.1 - Manual (Page 253)

4. The other K2 SAN-attached systems (not affected by the component failure) keep using the same
paths for media and control, as in pre-failover behavior. This means the K2 SAN-attached systems
unaffected by the failover are using the iSCSI adapter (TOE) on the “A” K2 Media Server to
provide access to the Fibre Channel connected RAID storage, while at the same time the affected
K2 SAN-attached systems are using the iSCSI adapter (TOE) on the “B” K2 Media Server to
provide access to the Fibre Channel connected RAID storage. In this case both RAID controller
are simultaneously providing disk access.
Control Team failover behavior
K2 RAID
K2 Media
Servers
K2 SAN-attached system
Connection
Failure
Ethernet
switches
A
A B
B
Fibre Channel
connections
Control
Media
Control
Media
Control
FTP
Media
Control
FTP
Media
ISLs
X
If the following system connection or component fails to respond to network communication:
• The control connection between a K2 SAN-attached system and GigE switch “A”.
Then the following failover behavior occurs:
1. The control team on the K2 SAN-attached system fails over and communication begins on the
other control port.
2. The control communication finds a path through GigE “B” switch and across an ISL to GigE
switch “A” to reach the same control port on the same K2 Media Server.
3. Media (iSCSI) traffic keeps using the same path.
4. K2 Media Server “A” is still the media file system/metadata server. The media file system (SNFS)
and media database do not fail over.
5. The other K2 SAN-attached systems (not affected by the connection failure) keep using the same
paths for media and control, as in pre-failover behavior.
02 February 2012 K2 SAN Installation and Service Manual 253
Operating the K2 SAN