RE: Thoughts on crs installation on HP-UX

From: Matthew Zito <>
Date: Fri, 23 Jan 2009 11:36:07 -0500
Message-ID: <>

Neither bonding nor trunking offers a perfect solution for Ethernet device HA - if you try to use link aggregation, they have to both be connected to the same switch, creating a SPOF, and if they're connected to both switches, then either MII link notification (unreliable with certain drivers) or ARP pinging (bad mojo happens if an external network failure occurs) has to be used to detect failures.

Not that it won't work fine in most environments, but Linux bonding isn't nearly as nice as what the commercial clustering solutions (Veritas, SG, etc.) offer.


-----Original Message-----

From: D'Hooge Freek [] Sent: Friday, January 23, 2009 11:18 AM
To: Matthew Zito; Dan Norris
Cc:; Subject: RE: Thoughts on crs installation on HP-UX

On linux you can use bonding to create a redundant interconnect without additional cost (with the benefit of having more bandwidth). In solaris you can also use ipmp for active/passive failover and I think that in solaris 10 sun truncing (which supports active/active) is also free.
But I don't know if HP-UX has something similar (without license cost).

Freek D'Hooge
Oracle Database Administrator
tel +32(0)3 451 23 82

From: Matthew Zito [] Sent: vrijdag 23 januari 2009 16:16
To: Dan Norris
Cc: D'Hooge Freek;; Subject: RE: Thoughts on crs installation on HP-UX

I generally agree, with the two notable exception that using SG+CRS gives you the option of a clustered filesystem, something that you don't get with just CRS, and failover interconnects, which I believe you still can't do with CRS. If you don't care about those things though, or just don't want to deal with the added complexity.



Matthew Zito
Chief Scientist
GridApp Systems
P: 646-452-4090

-- Received on Fri Jan 23 2009 - 10:36:07 CST

Original text of this message