Load balancing and transparent failover in RAC 11g

Hi,
The only way to configure load balancing and transparent failover in RAC 11 g R2 is using the clauses LOAD_BALANCING and FAILOVER on the tnsnames.ora of application server. Is that correct?

If the database is admin-managed, I shall suggest that rather than playing with the remote_listener parameter , set one service as preferred for one instance.For the other service, let it be preferred on both the nodes. The service with just one instance as Preferred won't be able to use loab-balancing as there is just one instance available for its disposal.
HTH
Aman....

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LRT224 Load Balancing and Link Failover

Hi, I am new to this forum. I have recently set up the LRT224 with two different ISP's. I am having problems configuring the Load Balance and Link Failover.
When I have Load Balance selected only one ISP (WAN 1) is active, the other (WAN2, ISP modem) remains inactive. Why is Load Balance only engaging one ISP?
When I have Link Failover selected, even with attempts and seconds configured to one second, and WAN1 has packets lost, it doesn't switch over to WAN2.
I am not tech savey but any help will be greatly appreciated so that I can get both ISP's active with Load Balance or at least have Link Failover work almost instantly. Thanks.

Hi @BSue2015,
If both WAN1 and WAN2 are already getting IP Addresses from your ISPs then we can say that Load Balance is working. To check it further, do a speed test by going to http://www.speedtest.net. Dual WAN connections are doubling the amount of available full speed connections due to the load balancing. The speed should have its maximum throughput even if you have several users on the network.

Load balancing is not happening on RAC (oracle 11g Rel 2) on Linux 5.1

Hi,
Load balancing is not happening on Oracle 11g RAC. We have defined the SCAN listener and confured the TNS accordingly. Still we get the load maximum on node2 and less load on Node1 or vice versa. Please suggest me what to do?

This is not the right forum to ask this question.
regards

Load balancing and Failover

Hello,
We are wondering how load-balancing and failover of tpcall() work with
WTC:
The scenario:
We have one WLS Domain and two Tuxedo Domains. The Tuxedo Domains offer
the same set of services.
In the bdmconfig.xml, we specify connection_policy as 'ON_STARTUP' for
both Remote Tuxedo Domains. We also Import (T_DM_IMPORT) the same
Tuxedo Service from both Tuxedo Domains.
Questions:
1. Is there any load-balancing of the tpcall between the two Domains? If
so, is it round-robin? If round-robin, what determines the order?
2. If it is ONLY Failover, what determines the order of the tpcall? And,
is the Failover automatic? Or do we need to code for retry on failure?
3. ON_DEMAND vs ON_STARTUP: Does ON_DEMAND drop the connection to the
remote domain upon tpterm? And does ON_STARTUP use a pool of
TuxedoConnection objects?
4. Are there any configuration parameters for
'max_number-of_connections? What determines how many simultaneous
connections can be made?
Thanks,
Suresh Mohan.

Hi Suresh,
The following are my answers to your questions.
Suresh Mohan wrote:
Hello,
We are wondering how load-balancing and failover of tpcall() work with
WTC:
The scenario:
We have one WLS Domain and two Tuxedo Domains. The Tuxedo Domains offer
the same set of services.
In the bdmconfig.xml, we specify connection_policy as 'ON_STARTUP' for
both Remote Tuxedo Domains. We also Import (T_DM_IMPORT) the same
Tuxedo Service from both Tuxedo Domains.
Questions:
1. Is there any load-balancing of the tpcall between the two Domains? If
so, is it round-robin? If round-robin, what determines the order?Yes there is a load balancing between two remote Tuxedo TDomain Gateways.
The algorithm is random, not RR. Over time this should give equal
opportunities to both remote TDomain.
>
2. If it is ONLY Failover, what determines the order of the tpcall? And,
is the Failover automatic? Or do we need to code for retry on failure?The load balancing is always there. The failover is automatic. When a
connection to a remote TDomain encountered a problem (ie network) the remote
domain will be put on retry open connection (in ON_STARTUP) and the load
balancing will not select it until the connection re-established.
However, the tpcall() that encountered the error will not be retried to send
to different destination. It is up to the application to decide whether it
want to resend. Any requests called after the error will not select the
failed Remote TDomain.
>
3. ON_DEMAND vs ON_STARTUP: Does ON_DEMAND drop the connection to the
remote domain upon tpterm? And does ON_STARTUP use a pool of
TuxedoConnection objects?TPTERM() only terminate your application session to WTC. WTC still maintain
a secured T-session to remote Tuxedo TDomain. WTC does not use a pool of
TuxedoConnection Objects, the object stored in the JNDI refers to WTC.
>
4. Are there any configuration parameters for
'max_number-of_connections? What determines how many simultaneous
connections can be made?No. As described in #3, there is no need to use connection pool in WTC. WTC
uses session and virtual circuit design concept as Tuxedo TDOMAIN, the
logical pool is created/destroyed dynamically. That is the reason why you
can have a lot of TPACALL() outstanding at the same time. (The limitation is
the availability system resource.)
>
>
Thanks,
Suresh Mohan.Regards,
Hong-Hsi :-)

Load Balancing and Failover with 10G Standard Edition

Hi,
I am new to Oracle Replication and need some help setting up replication for load balancing and failover. Is this possible using Oracle 10G Standard Edition? I plan on having all updates done on the master site and both databases will be for reads. In case of failure of the master site, I would need to be able to failover to the other database.
Also, if anyone knows of any documention for Basic Replication in 10G, please let me know.
Thanks.

Simple nnapshot replication of data would require significant manual effort to configure to load balance or failover. One the load balancing side, you would generally be limited to to static load balancing-- assigning half the users to one machine and the other half of the users to the other machine, regardless of who is actively using the machine. Failover would be a significant manual effort, particularly to bring the failed machine back into the cluster. You would be implementing the guts of multi-master replication.
Frankly, if you actually have a system which is valuable enough to need load balancing and disaster recovery, I'm going to wager that it will be far cheaper even in the short run to buy more boxes and/or enterprise edition licenses than to try to implement this sort of thing yourself. In the long run, it will be far cheaper, since it will be far easier to maintain. Building all this yourself would probably be penny wise and pound foolish.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Load balancing and failover in Embedded LDAP in weblogic

How to handle load balancing and failover in Embedded LDAP in weblogic server?

You should consider posting this to the Weblogic and/or LDAP support forums. This forum is meant for Sun Web Server questions.
Thanks
Manish

Network Load Balancing and failover for AFP Sharing

Dear all,
Somebody kindly teach me to use round robin DNS to perform the network load balancing, it's success but not the failover.
I have 4 xserve and want to do the load balancing and failover at the same time.
I have read the IP failover document and setup it successfully, but anyone know is it possible to do the IP failover for more than 2 server?
For example, 4 server serving the AFP service at the same time, maybe I have 1 more extra server to do the IP failover for thoese 4 servers.
As I know, IP failover require Firewire as the heartbeat detection. But one xserve only have 2 firewire ports. May I setting up the IP failover only by a ethernet port and an IP address? does it possible to detect and failover to any server after server down has been detected?
I believe load balancer maybe the best solution but its cost is too high.
Thanks any advance!
Karllee

well, u have 2 options here
software load balancing
request comes it foo.com -> ws7u2 hosting foo.com is configured to run as reverse proxy . this server sends any incoming requests to one of the four back end web server 7 handling your incoming request
hardware load balancing (this you need to invest)
request comes to hardware load balancer who responds for foo.com -> sends requests to four ws7 server hosting your application
you could try out how software load balancing works out for you before you invest in hardware load balancing
here is more instruction on configuring ws7 + reverse proxy (software load configuration)
- install ws7 on foo.com
- create a new configuration (choose port 80, disable java

Dual WLAN links with load balancing and failover

Hello,
I am in a scenario where I am in need of two WLAN links between two buildings. There is a distance of 100-150 meters and minimum bandwidth required for both links together is 300Mbit/s. The thing is that both links should use load balancing between them and if one of them goes down, the last one should act as fail over.
I have been looking at Cisco Aironet 1550 Series though I have no idea what is needed to get load balancing and fail over to work, so I am searching here for suggestions on what equipment is needed.
Something like this:
              ---------------WLAN Link 150-300Mbit/s-----------
Building                    Load balancing and fail over               Building
          ---------------WLAN Link 150-300Mbit/s-----------
Thanks in advance!

Several points.
When an AP is doing 300Mbps, that's NOT the real throughput you have. It's the data rate at which traffic is sent.
All in all, if your AP/client are doing 300MBps association, you will see max 150Mbps with a file transfer.
From there, I'm not even sure that 11n supports dual spatial streams over such long distances (you can't have multipath in open air) so afaik the 1550 only do 150Mbps association rate (=dual channel with one spatial stream). That means 75Mbps real speed.
I couldn't test a 1550 yet so don't take my word for official statement but that's what I'm thinking.
the wireless links will always be both up and they can be on different channels.
That will then mean that it will be "as if" the remote switch was connected directly to the central switch (where WLC is connected) as the WLC tunnels traffic all the way. So you could do a spanning-tree config on this one I guess to block the port onthe remote switch.
Regards,
Nicolas

VPN load balancing and ASA !!!

Hi netpros,
I have a couple of questions about this and hope you might be able to assist me.
1.- Are VPN load balancing and failover (Active/Active) mutually exclusive ..? I mean they can't be used at the same time correct ..?
2.- How does the ASA handle the return traffic from the Internal LAN towards the remote client .. Because the cluster only requires ONE public virtual IP address, which will work for incoming packets .. but what about the return traffic which has knowledge of the DHCP scope's default gateway IP address only .. ? How gets the returned packet redirected from the default gateway IP address to the respective ASA internal IP address .?
3.- VPN load balancing only applies to remote clients using easy VPN technology (easy vpn client, hardware client , pIX using easy vpn client etc ) and does not work with static LAN-LAN tunnel .. correct ..?
Your comments are much appreciated

Hi Gilbert ..
1.- Thanks I wanted to make sure.
2.- I know that .. my question is in regards the return packets .. for example if I have the below IP schema:
ASA1: Public 20.20.20.20
Private 192.168.1.1
ASA2: Public 20.20.20.21
Private 192.168.1.2
Cluster virutal IP: 20.20.20.10
Default gateway for segment 192.168.1.0 is 192.168.1.1
Let's say that a vpn client tries to connect and the cluster instructs the client to connect to ASA2 20.20.20.21. The packets reach the internal server at 192.168.1.100. The internal server then sends the return packets back to the client by forwarding them to its default gateway which is 192.168.1.1 (ASA1). Here is my question .. how does the cluster handles this because the return packet are supposed to be directed to ASA2 192.168.1.2
3.- Any idea about this one ..?
Cheers,

2 ISP load balancing and redundancy

Hello!!
Our small company has about 40 branches spreaded within city. Branches are connected by optic wire supplied by our ISP. So in ISP our branches are located in one VLAN. From every branch we created VPN tunnel to our server room in central office. Central office is like a cetner point. If optic wire fails to central office, there would no VPN tunnels and no network to all branches. Moreover, all the traffice goes through central office.
Now we decided to pave one more optic line to our central office. And that will increase bandwidth and redundancy.
Private network topology: There are no default gateways and ip-addresses. For examle, at first branch I will plug computer directly into media converter and at the second branch plug another computer to the media converter. After that this two computers became in one network. And can assign any ip addresses to them.
What I have: our firewall do enough work, don't want to overload it. But we have some free ports in our new cisco 3750. The question is how to do load balancing and redundanccy? Can it do load balancing according to traffic? And how load balance incoming traffic? For example, connection was established from branche's router, how this router will choose through which line make connection? By the way, at all branches we use noisy cisco
3700 series routers.

Sorry for upping 1 year old threat.
We talked to our Network Provider. They said "these two cables are coming from two different places, so there is no way to use etherchannel. You must use active-standby solution."
Relying on STP we just put two cables into 3750 stack. But with default STP settings, connection was very unstable, many packet losses and disconnections. So we found easy solution with "flex links", making one interface backup of the other. And only now I recognized that this is not a failover solution. Because, if network beyond media converter will down, link from media converter to switch would still up.
What could I do to make our L2 WAN redundant? Are there any additional STP settings.

Load balancing for specific services in RAC

Hi,
I have a two node RAC database 11gR2 version.I am planning to create 2 services for the database.For one of the services I dont want to enable server side load balancing and for the other one I want to enable load balancing.Will the following setting work
services:
srv1 -- load balancing not to be enabled
srv2 -- load balancing to be enabled
DB configuration:
For srv1 I will not use SCAN ip and I will connect using the vip of the servers.
For srv2 I will use SCAN ip and i will set the remote_listener(to SCAN:port) parameter and local listener parameter accordingly.
Will this serve my purpose
Thanks
Sekar

If the database is admin-managed, I shall suggest that rather than playing with the remote_listener parameter , set one service as preferred for one instance.For the other service, let it be preferred on both the nodes. The service with just one instance as Preferred won't be able to use loab-balancing as there is just one instance available for its disposal.
HTH
Aman....

Load-balancing of transparent cache + IP spoofing + RTSP + MMS not working

We have already in production an architecture with load-balancing of
transparent cache + ip spoofing.
We are unable to do the same for streaming flows (MMS and RTSP).
We are doing PBR from our core network (2 * C6K) to redirect port 80, 554 and
1755 toward CSS boxes, same in our access router (2* Ciso7200).
In this config desired flows are redirected toward the CSS.
Then CSS should load balance the traffic toward our BlueCoat proxy-cache farm.
It's working fine for HTTP but we are unable to make it works for MMS and
RTSP.
Note that we are requiered to use ECMP to perform IP Spoofing on the CSS, meaning we need 4 routes for each client subnet (one route toward upstream C6K, and 3 routes for each proxy cache). We use acl to get rid off looping condition.
Anyone who has already put in place Load-balancing of Streaming transparent cache + IP spoofing could give us some hint.
Many thanks.
Regards,
Pierre Viennet

Gilles, thanks for your input.
Here where we are at with streaming implementation:
- HTTP on all type off client is working
- RTSP: TCP 554 with Real Media client is working
- RTSP: TCP 554 with WMP not working, but it's due to a bug in Bluecoat implementation, the proxy send an error when he see a request with ( User-Agent: WMPlayer ) for RTSP content.
- MMS: TCP 1755 not working with IP spoofing enable on the proxy but OK without IP spoofing...
- UDP 554: not working
- UDP 1755: not working
I fully understand the limitation for UDP traffic.
But I don't see why it's not working for MMS over TCP traffic.
Note that I have the exact same configuration for RTSP and MMS.
Why is it not working for MMS with IP spoofing? Are you aware of a difference on the way CSS handle MMS flows? or a specificity of the MMS protocol?
Below what we can see on the different equipement when trying to launch a MMS over TCP Stream:
c6k-Faaa#sh mls ip source 195.83.182.72
Displaying Netflow entries in Supervisor Earl
DstIP SrcIP Prot:SrcPort:DstPort Src i/f:AdjPtr
Pkts Bytes Age LastSeen Attributes
202.3.225.5 195.83.182.72 tcp :1755 :1504 0 : 0
3 124 17 18:58:12 L3 - Dynamic
202.3.225.5 195.83.182.72 tcp :1755 :1527 0 : 0
2 84 3 18:58:20 L3 - Dynamic
202.3.225.5 195.83.182.72 tcp :554 :1503 0 : 0
4 360 17 18:58:06 L3 - Dynamic
c6k-Faaa#
CSS11503_CORE1# sho flows 202.3.225.5 | grep 1755
202.3.225.5 38531 195.83.182.72 1755 0.0.0.0 TCP
2/3 2/1
202.3.225.5 1527 195.83.182.72 1755 195.83.182.72 TCP
2/7 2/3
CSS11503_CORE1# sho flows 202.3.225.5 | grep 1755
202.3.225.5 38531 195.83.182.72 1755 0.0.0.0 TCP
2/3 2/1
202.3.225.5 1527 195.83.182.72 1755 195.83.182.72 TCP
2/7 2/3
CSS11503_CORE1# sho flows 202.3.225.5 | grep 1755
202.3.225.5 38531 195.83.182.72 1755 0.0.0.0 TCP
2/3 2/1
202.3.225.5 1527 195.83.182.72 1755 195.83.182.72 TCP
2/7 2/3
CSS11503_CORE1#
TCP 192.168.4.19:1491 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1492 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1493 195.83.182.72:1755 TIME_WAIT
TCP 192.168.4.19:1502 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1503 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1504 195.83.182.72:1755 TIME_WAIT
TCP 192.168.4.19:1525 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1526 195.83.182.72:554 TIME_WAIT
TCP 192.168.4.19:1527 195.83.182.72:1755 TIME_WAIT
Many Thanks for your input.
Pierre Viennet.

TES6.1 Load Balancing and DSP

Haven't gotten much response to my other posts, hoping I get some about this.
For those using load balancing, do you name your DSP the same on both servers? I was trying to see if there were pros and cons to naming them different or the same (or if you can't name them the same).
We have them named different, one is TesDevCM1 and the other is TesDevCM2. This makes it easier to troubleshoot and know where someone is connected BUT I realize that this is not good when you are trying to truly utilize loadbalancing for example for Transporter and TESCmmandline as this forces you to bound these apps to a specific CM.
Just wanted to see if there were opinions out there. (Made my post shorter, hopefully someone will respond ^_^)

Hi Jesse,
Actually it works after you asked me to go through the web cache documentation which i posted question on how to do the load balancing and failover. Thanks for you help. I just want to double confirm whether i did correctly. Since i have problem in passing the session variables. Which the server switch between the two servers for load balacing, it can't bring the session variables from server 1 to server 2. It will give error on the pages. I want to ask whether anyway to bring the session variables from server1 to server2??
Besides, can you please tell me if i just wanted to have failover but not load balancing, can this be done???
Thanks
Regards,
Ming Jade

OCS on a cluster with Load balancing and fail safe environment

Dear all,
i want to ask is there any documat or hints on how to do an OCS R2 installaiotn on 3 server with RAC option (clustered Fail Safe), how can i install OCS on a cluster with Load balancing and fail safe environment.
plz i need ur help
thanking u
[email protected]

Dear all,
i want to ask is there any documat or hints on how to do an OCS R2 installaiotn on 3 server with RAC option (clustered Fail Safe), how can i install OCS on a cluster with Load balancing and fail safe environment.
plz i need ur help
thanking u
[email protected]

ISA570-Load balancing and Losing packets

I am load balancing two isp's. One isp is fine, but the other I have very high packet loss when pinging the corresponding wan interface from any machine located outside our network. During the packet loss, I cannot https to our firewall from outside our network, but I can rdp using a different address on that same isp and ping another machine located inside our network, it seems only the wan interface is having the issues. Our isp uses icmp to our wan interface and they started noticing the loss the other day, again the other isp loses no packets. I have no issues with clients losing connection from that isp so it looks like it is an issue from outside in only on that wan interface.
I have a spare ISA and that is experiencing no packet loss when using another ip from the problem isp on it's wan interface. The isa's have the same configuration and when I tried moving completely to the backup isa it continued with the same issue. Upgraded to a later firmware, still the same issue. I even took a laptop and put it on our switch that is before the isa and gave it a static public address and I can ping it with no problem from the outside. I can also ping from the laptop to the wan port of the prod isa that is losing packets and it replies as it should, which I assumed would lose packets if it were the isa having issues, but it didn't.
I know this has nothing to do with Cisco security services as on the backup firewall it was still losing packets when we moved the connections over to it.
I can ping from inside my network to the public wan address with no loss when outside machines are having problems.
I can ping the problem wan address from a laptop or from isa(IP = 64.x.x.42) to isa(IP = 64.x.x.45) with no packet loss.
This is a head scratcher and I need some real help here.

Never figured this one out. However, I was able to figure out how this starts. A couple of weeks ago we had an issue with an ISP and we disabled that interface during the day and re-enabled at the end of the day and thats when we noticed ICMP breaks to other ISP.. I don't know why but the ISP we renabled we can ping just fine, but the other one always has issues. The only fix is to enable link failover detection and both WAN interfaces become pingable again.
Now, we use load balancing and one issue we are experiencing is that randomly both WAN interfaces go down and I can confirm this with a ping utility we use off site that pings both WAN interfaces and also each ISP gateway they are connected to. When this happens the ISP's gateways are reachable and neither WAN interface on the ISA are. I am still on .15 version of the firmware, because there were too many issues with newer releases. Is this a known issue?

Load balancing and transparent failover in RAC 11g

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