How does ServiceGuard monitor a subnet

[Rudy Williams]

In a package we may specify a subnet that we want ServiceGuard to monitor. If the subnet is not reachable the package will failover.

How is is that the subnet is monitored? Ping?

cjw

[Jeff Schussele · Accepted solution]

Hi cjw,

No, it uses DLPI (Data Layer Provider I/F) packets on layer 2 to it's defined subnet nodes. If no response the pkg fails over.

If, however the driver reports a HW error from the card (HW failure, link lost, etc.) AND there's a standby lan defined, then MC/SG fails over to that NIC & the pkg stays put.

HTH,
Jeff

[James Murtagh]

Hi Chris,

In addition to Jeff's comments, full information can be found here :

http://www.docs.hp.com/hpux/onlinedocs/B3936-90065/B3936-90065.html

The chapter you want is "Understanding MC/ServiceGuard Software Components" - it has a few sections that deal with this topic in detail.

Cheers,

James.