RE: Thoughts on crs installation on HP-UX

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.

Thanks,
Matt

-----Original Message-----
From: D'Hooge Freek [mailto:Freek.DHooge@xxxxxxxxx] 
Sent: Friday, January 23, 2009 11:18 AM
To: Matthew Zito; Dan Norris
Cc: sxmte@xxxxxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
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
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer


________________________________________
From: Matthew Zito [mailto:mzito@xxxxxxxxxxx]
Sent: vrijdag 23 januari 2009 16:16
To: Dan Norris
Cc: D'Hooge Freek; sxmte@xxxxxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
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.

Thanks,
Matt

--
Matthew Zito
Chief Scientist
GridApp Systems
P: 646-452-4090
mzito@xxxxxxxxxxx
http://www.gridapp.com


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