RE: Mixing RAC interconnect with other clusters
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <justin@xxxxxxx>, <nadeem.m.khan@xxxxxxxxx>
- Date: Sat, 29 Mar 2014 09:15:04 -0400
IF the VLAN software quality of service actually works for both latency and
throughput and reacts quickly enough when challenged with loads on virtual
channels other than the private RAC channel.
In practice if your in house experts have correctly configured things there
is a tendency to disbelieve that they are not actually protecting the
required latency and throughput continuously enough to avoid problems.
As the prices of hardware pieces drop, you need to think long and hard about
how few incidents it would take to pay for private physical capacity.
My experience is that the network group does not have to make a mistake for
it to NOT work, and then all variety of hilarity ensues and it becomes
difficult to remember that the various teams in infrastructure are trying to
help each other out.
mwf
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Justin Mungal
Sent: Saturday, March 29, 2014 8:08 AM
To: nadeem.m.khan@xxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Mixing RAC interconnect with other clusters
Oracle recommends that each RAC Interconnect have a dedicated switch, let
alone sharing a single VLAN for multiple RACs (Assuming multiple RAC
clusters because you pluralized Interconnect). It can work, but you may run
into performance problems and troubleshooting difficulties should the switch
backplane(s) you're using as Interconnects become saturated.
-Justin
On Sat, Mar 29, 2014 at 4:39 AM, Nadeem M. Khan <nadeem.m.khan@xxxxxxxxx>
wrote:
I think I already know the answer to this one (No), but thought of taking
your opinions.
Suppose a shop wants to use different clusters for different purposes - RAC,
RHCS, ServiceGuard, HACMP, Veritas and even VMware vSphere. For
interconnects, they plan to have one dedicated private VLAN that will be
isolated from public traffic. My question is - can the same private VLAN be
used for RAC interconnects as well as other cluster interconnects? They will
be having only one cluster of each type.
If the answer is No, I suppose each cluster type will need a separate VLAN?
For example -
RAC private VLAN
RHCS private VLAN
HACMP private VLAN and so on.
Thanks in advance!
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