IB failover
Can someone help me how to troubleshoot for IB failover domains?
Any simple and clean links or steps to troubleshoot for IB failover domains will be highly appreciated..
Regards,
Pradeep. v
Hi Nicolas,
So does that mean , there is no manual intervention when a IB domain failover occurs?
In our environment, actually two servers for each app for load balancing , eg for hr node 1 and node2. And in each node two domains- node 1 contains one domain for app and one for IP , and node 2 contains one domain for app and one for IP. But this parameter Domain Slave Mode value is 0. for both IB domains in both node 1 and node 2. So can you explain how to go for troubleshoot if IB failover occurs,
Regards,
Pradeep. V
Similar Messages
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In oracle rac, If user query a select query and in processing data is fetched but in the duration of fetching the particular node is evicted then how failover to another node internally?
The query is re-issued as a flashback query and the client process can continue to fetch from the cursor. This is described in the Net Services Administrators Guide, the section on Transparent Application Failover.
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Reporting Services as a generic service in a failover cluster group?
There is some confusion on whether or not Microsoft will support a Reporting Services deployment on a failover cluster using scale-out, and adding the Reporting Services service as a generic service in a cluster group to achieve active-passive high
availability.
A deployment like this is described by Lukasz Pawlowski (Program Manager on the Reporting Services team) in this blog article
http://blogs.msdn.com/b/lukaszp/archive/2009/10/28/high-availability-frequently-asked-questions-about-failover-clustering-and-reporting-services.aspx. There it is stated that it can be done, and what needs to be considered when doing such a deployment.
This article (http://technet.microsoft.com/en-us/library/bb630402.aspx) on the other hand states: "Failover clustering is supported only for the report server database; you
cannot run the Report Server service as part of a failover cluster."
This is somewhat confusing to me. Can I expect to receive support from Microsoft for a setup like this?
Best Regards,
Peter WretmoHi Peter,
Thanks for your posting.
As Lukasz said in the
blog, failover clustering with SSRS is possible. However, during the failover there is some time during which users will receive errors when accessing SSRS since the network names will resolve to a computer where the SSRS service is in the process of starting.
Besides, there are several considerations and manual steps involved on your part before configuring the failover clustering with SSRS service:
Impact on other applications that share the SQL Server. One common idea is to put SSRS in the same cluster group as SQL Server. If SQL Server is hosting multiple application databases, other than just the SSRS databases, a failure in SSRS may cause
a significant failover impact to the entire environment.
SSRS fails over independently of SQL Server.
If SSRS is running, it is going to do work on behalf of the overall deployment so it will be Active. To make SSRS Passive is to stop the SSRS service on all passive cluster nodes.
So, SSRS is designed to achieve High Availability through the Scale-Out deployment. Though a failover clustered SSRS deployment is achievable, it is not the best option for achieving High Availability with Reporting Services.
Regards,
Mike Yin
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TechNet Community Support -
What is solution of nat failover with 2 ISPs?
Now I have lease line link to 2 ISPs for internet connection. I separate packets of users by accesslist such as www go to ISP1 and mail or other protocol go to ISP2 . Let's say link go to ISP1 down I need www traffics failover to ISP2 and vice versa.
Problem is acl on nat statement?
If you config about this.
access-l 101 permit tcp any any www -->www traffic to ISP1
access-l 101 permit tcp any any mail --> back up for mail packet to ISP2 down
access-l 102 permit tcp any any mail -->mail packet to ISP2
access-l 102 permit tcp any any www --> back up for www traffic go to ISP2
ip nat inside source list 101 interface s0 overload
ip nat inside source list 102 interface s1 overload
In this case is links of ISP1 and ISP2 are UP.
when you apply this acl on nat statement then nat will process each statement in order( if I incorrect please correct me) so mail traffics will match in this acl and then nat with ip of ISP1 only.
please advice solution about this
TIAHi,
If you have two serial links connecting to two diff service provider , then you can try this .
access-l 101 permit tcp any any www
access-l 102 permit tcp any any mail
route-map isp1 permit 10
match ip address 101
set interface s0
route-map isp2 permit 10
match ip address 102
set interface s1
ip nat inside route-map isp1 interface s0 overload
ip nat inside source route-map isp2 interface s1 overload
ip nat inside source list 103 interface s0 overload
ip nat inside source list 104 interface s1 overload
ip route 0.0.0.0 0.0.0.0 s0
ip route 0.0.0.0 0.0.0.0 s1 100
In case if any of the link fails , automatically the other traffic would prefer the other serial.
I have not tried the config , just worked out the config on logic .pls go through and try if possible
pls see the note2 column
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093fca.shtml#related
Hope it helps
regards
vanesh k -
Advice Requested - High Availability WITHOUT Failover Clustering
We're creating an entirely new Hyper-V virtualized environment on Server 2012 R2. My question is: Can we accomplish high availability WITHOUT using failover clustering?
So, I don't really have anything AGAINST failover clustering, and we will happily use it if it's the right solution for us, but to be honest, we really don't want ANYTHING to happen automatically when it comes to failover. Here's what I mean:
In this new environment, we have architected 2 identical, very capable Hyper-V physical hosts, each of which will run several VMs comprising the equivalent of a scaled-back version of our entire environment. In other words, there is at least a domain
controller, multiple web servers, and a (mirrored/HA/AlwaysOn) SQL Server 2012 VM running on each host, along with a few other miscellaneous one-off worker-bee VMs doing things like system monitoring. The SQL Server VM on each host has about 75% of the
physical memory resources dedicated to it (for performance reasons). We need pretty much the full horsepower of both machines up and going at all times under normal conditions.
So now, to high availability. The standard approach is to use failover clustering, but I am concerned that if these hosts are clustered, we'll have the equivalent of just 50% hardware capacity going at all times, with full failover in place of course
(we are using an iSCSI SAN for storage).
BUT, if these hosts are NOT clustered, and one of them is suddenly switched off, experiences some kind of catastrophic failure, or simply needs to be rebooted while applying WSUS patches, the SQL Server HA will fail over (so all databases will remain up
and going on the surviving VM), and the environment would continue functioning at somewhat reduced capacity until the failed host is restarted. With this approach, it seems to me that we would be running at 100% for the most part, and running at 50%
or so only in the event of a major failure, rather than running at 50% ALL the time.
Of course, in the event of a catastrophic failure, I'm also thinking that the one-off worker-bee VMs could be replicated to the alternate host so they could be started on the surviving host if needed during a long-term outage.
So basically, I am very interested in the thoughts of others with experience regarding taking this approach to Hyper-V architecture, as it seems as if failover clustering is almost a given when it comes to best practices and high availability. I guess
I'm looking for validation on my thinking.
So what do you think? What am I missing or forgetting? What will we LOSE if we go with a NON-clustered high-availability environment as I've described it?
Thanks in advance for your thoughts!Udo -
Yes your responses are very helpful.
Can we use the built-in Server 2012 iSCSI Target Server role to convert the local RAID disks into an iSCSI LUN that the VMs could access? Or can that not run on the same physical box as the Hyper-V host? I guess if the physical box goes down
the LUN would go down anyway, huh? Or can I cluster that role (iSCSI target) as well? If not, do you have any other specific product suggestions I can research, or do I just end up wasting this 12TB of local disk storage?
- Morgan
That's a bad idea. First of all Microsoft iSCSI target is slow (it's non-cached @ server side). So if you really decided to use dedicated hardware for storage (maybe you do have a reason I don't know...) and if you're fine with your storage being a single
point of failure (OK, maybe your RTOs and RPOs are fair enough) then at least use SMB share. SMB at least does cache I/O on both client and server sides and also you can use Storage Spaces as a back end of it (non-clustered) so read "write back flash cache
for cheap". See:
What's new in iSCSI target with Windows Server 2012 R2
http://technet.microsoft.com/en-us/library/dn305893.aspx
Improved optimization to allow disk-level caching
Updated
iSCSI Target Server now sets the disk cache bypass flag on a hosting disk I/O, through Force Unit Access (FUA), only when the issuing initiator explicitly requests it. This change can potentially improve performance.
Previously, iSCSI Target Server would always set the disk cache bypass flag on all I/O’s. System cache bypass functionality remains unchanged in iSCSI Target Server; for instance, the file system cache on the target server is always bypassed.
Yes you can cluster iSCSI target from Microsoft but a) it would be SLOW as there would be only active-passive I/O model (no real use from MPIO between multiple hosts) and b) that would require a shared storage for Windows Cluster. What for? Scenario was
usable with a) there was no virtual FC so guest VM cluster could not use FC LUs and b) there was no shared VHDX so SAS could not be used for guest VM cluster as well. Now both are present so scenario is useless: just export your existing shared storage without
any Microsoft iSCSI target and you'll be happy. For references see:
MSFT iSCSI Target in HA mode
http://technet.microsoft.com/en-us/library/gg232621(v=ws.10).aspx
Cluster MSFT iSCSI Target with SAS back end
http://techontip.wordpress.com/2011/05/03/microsoft-iscsi-target-cluster-building-walkthrough/
Guest
VM Cluster Storage Options
http://technet.microsoft.com/en-us/library/dn440540.aspx
Storage options
The following tables lists the storage types that you can use to provide shared storage for a guest cluster.
Storage Type
Description
Shared virtual hard disk
New in Windows Server 2012 R2, you can configure multiple virtual machines to connect to and use a single virtual hard disk (.vhdx) file. Each virtual machine can access the virtual hard disk just like servers
would connect to the same LUN in a storage area network (SAN). For more information, see Deploy a Guest Cluster Using a Shared Virtual Hard Disk.
Virtual Fibre Channel
Introduced in Windows Server 2012, virtual Fibre Channel enables you to connect virtual machines to LUNs on a Fibre Channel SAN. For more information, see Hyper-V
Virtual Fibre Channel Overview.
iSCSI
The iSCSI initiator inside a virtual machine enables you to connect over the network to an iSCSI target. For more information, see iSCSI
Target Block Storage Overviewand the blog post Introduction of iSCSI Target in Windows
Server 2012.
Storage requirements depend on the clustered roles that run on the cluster. Most clustered roles use clustered storage, where the storage is available on any cluster node that runs a clustered
role. Examples of clustered storage include Physical Disk resources and Cluster Shared Volumes (CSV). Some roles do not require storage that is managed by the cluster. For example, you can configure Microsoft SQL Server to use availability groups that replicate
the data between nodes. Other clustered roles may use Server Message Block (SMB) shares or Network File System (NFS) shares as data stores that any cluster node can access.
Sure you can use third-party software to replicate 12TB of your storage between just a pair of nodes to create a fully fault-tolerant cluster. See (there's also a free offering):
StarWind VSAN [Virtual SAN] for Hyper-V
http://www.starwindsoftware.com/native-san-for-hyper-v-free-edition
Product is similar to what VMware had just released for ESXi except it's selling for ~2 years so is mature :)
There are other guys doing this say DataCore (more playing for Windows-based FC) and SteelEye (more about geo-cluster & replication). But you may want to give them a try.
Hope this helped a bit :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts. -
No data in ecc variables in failover mode
Hi all,
got a problem with custom enterprise data layout when CAD is connected to secondary node.
With "set enterprise..." I set a special layout for CAD enterprise data in my script. This works fine as long as CAD is connected to primary node. When CAD is connected to secondary node there is no data in expanded call variales and CAD displays default layout. Changing default layout and writing the content to predefined variables works fine. So it seems only extended call variables are not working in failover mode.
Any ideas?
Br
Sven
(UCCX v8.5)Hi Sven,
Looks like TAC helped fix the issue. Previously we had rebooted both servers without success. TAC suggested to restart the Desktop Enterprise Service on both servers (I did Pub first than Sub). I've verified ECC variables are being sent to CAD correctly.
The root cause might of been a network outage we had a week ago. We were using the Desktop Workflow Administrator at the time of the outage.
Kyle -
Difference between scalable and failover cluster
Difference between scalable and fail over cluster
A scalable cluster is usually associated with HPC clusters but some might argue that Oracle RAC is this type of cluster. Where the workload can be divided up and sent to many compute nodes. Usually used for a vectored workload.
A failover cluster is where a standby system or systems are available to take the workload when needed. Usually used for scalar workloads. -
Install Guide - SQL Server 2014, Failover Cluster, Windows 2012 R2 Server Core
I am looking for anyone who has a guide with notes about an installation of a two node, multi subnet failover cluster for SQL Server 2014 on Server Core edition
Hi KamarasJaranger,
According to your description, you want configure a SQL Server 2014 Multi-Subnet failover Cluster on Windows Server 2012 R2. Below are the whole steps for the configuration. For the detailed steps about the configuration, please download
and refer to the
PDF file.
1.Add Required Windows Features (.NET Framework 3.5 Features, Failover Clustering and Multipath I/O).
2.Discover target portals.
3.Connect targets and configuring Multipathing.
4.Initialize and format the Disks.
5.Verify the Storage Replication Process.
6.Run the Failover Cluster Validation Wizard.
7.Create the Windows Server 2012 R2 Multi-Subnet Cluster.
8.Tune Cluster Heartbeat Settings.
9.Install SQL Server 2014 on a Multi-Subnet Failover Cluster.
10.Add a Node on a SQL Server 2014 Multi-Subnet Cluster.
11.Tune the SQL Server 2014 Failover Clustered Instance DNS Settings.
12.Test application connectivity.
Regards,
Michelle Li -
Mounted Volume not shwoing up with Windows 2012 R2 failover cluster
Hi
We configured some drives as mounted volumes and configured it with Failover cluster. But it's not showing up the mounted volume details with Cluster Manager, it's showing the details as seen below
Expect support from someone to correct this issue
Thanks in advance
LMSHi LMS,
Are you doubt about the disk shown as GUID? Cluster Mount point Disk is showing as a Volume GUID in server 2012 R2 Failover Cluster I creating a mountpoint inside the cluster
and had the same behavior, instead of mount point name we had the volume GUI after volume label, that must by design.
How to configure volume mount points on a Microsoft Cluster Server
http://support.microsoft.com/kb/280297
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected] -
The Cluster not failover when i shutdown one managed server?
Hello, I created one cluster whit two managed servers, and deployed an application across the cluster, but the weblogic server gave me two url and two different port for access to this application.
http://server1:7003/App_name
http://server1:7005/App_name
When I shutdown immediate one managed server i lost the connection whit the application from this managed server, My question is, the failover and de load balancer not work, why??
Why two diferent address?
thank any helpWell you have two different addresses (URL) because those are two physical managed servers. By creating a cluster you are not automatically going to have a virtual address (URL) that will load balance requests for that application between those two managed servers.
If you want one URL to access this application, you will have to have some kind of web server in front of your WebLogic. You can install and configure Oracle HTTP Server to route requests to WebLogic cluster. Refer this:
http://download.oracle.com/docs/cd/E12839_01/web.1111/e10144/intro_ohs.htm#i1008837
And this for details on how to configure mod_wl_ohs to route requests from OHS to WLS:
http://download.oracle.com/docs/cd/E12839_01/web.1111/e10144/under_mods.htm#BABGCGHJ
Hope this helps.
Thanks
Shail -
Want to configure BACKUP VPN in asa 5505 for failover link
Hi,
Current i'm having 2 isps one tata and another one reliance iwant to configure the backup vpn for reliance ip for same peer ip which tata vpn had configured
i mandatory to configure same SA,ENCRPTION,IPSEC POLICY,KEY,LIFETIME...etc for failover vpn also.Hi michael,
First of thanks for reply.
Can we do it by public certificate or DNS entry e.g. both ISP Public ip address entry will be in DNS and user will hit particular DNS name. You r right that once link down so user will disconnect but when he will retry then he will connect via another link.
Is it possible??
Ashish -
2 ISP link failover in ASA 5505
Hi,
I have ASA 5505, want to configure the 2 ISP link Tata and Airtel with failover.
I want to configure the WebVPN with failover, so that user don't need to change the public address when one link goes down.
thanks with regards
Ashish KumarHi michael,
First of thanks for reply.
Can we do it by public certificate or DNS entry e.g. both ISP Public ip address entry will be in DNS and user will hit particular DNS name. You r right that once link down so user will disconnect but when he will retry then he will connect via another link.
Is it possible??
Ashish -
ASA 5505 ISP Failover (PPPoE/DHCP)
Hello,
I have 2 WAN uplinks:
The primary is VDSL (PPPoE) - very fast, and I have a static IP + /29 subnet 'assigned' to me.
The secondary is DSL (DHCP) - slower
What I'm trying to do is setup ISP failover on my ASA 5505 with security plus licence... and the way I have it currently setup 'half-works'. If the primary goes down - the primary route is removed from the routing table and the secondary route is 'inserted'. I have the NATs setup so I have internet access and all seems well. The problem however is when the primary ISP comes online again, the ASA doesn't switch back over. It maintains the backup route until I manually switch it (by temporarily disabling the backup ISP switch port).
This is what I did to configure it:
config t
sla monitor 10
type echo protocol ipicmpecho x.x.x.x interface outside-primary
frequency 5
exit
sla monitor schedule 10 life forever start-time now
track 1 rtr 10 reachability
route outside-primary 0 0 x.x.x.x 1 track 1
route outside-backup 0 0 y.y.y.y 2
nat (inside,outside-primary) after-auto source dynamic any interface
nat (inside,outside-backup) after-auto source dynamic any interface
Have I missed anything? Is there a better way to set this up? I noticed in the ADSM if you edit an interface there seems to be the ability to set tracker IDs, SLA IDs, etc - but couldn't really find anything on google that helped.
Any assistance would be greatly appreciated.
Thanks!
RobertHi Robert,
you need this command:
no ip verify reverse-path interface outside_primary
Problem:
SLA monitoring does not work after the ASA is upgrade to version 8.0.
Solution:
The problem is possibly be due to the IP Reverse-Path command configured in the OUTSIDE interface. Remove the command in ASA and try to check the SLA Monitoring.
For reference:
http://www.cisco.com/c/en/us/support/docs/security/pix-500-series-security-appliances/70559-pix-dual-isp.html
https://supportforums.cisco.com/blog/150001
HTH
"Plz don't forget to choose correct answer and rate help full answer " -
ASA-5505 failover, cant choose interface
Hi
I am trying to configure two ASA-5505 as a failover pair.
Software 8.2.5 and ASDM 6.4.5.206
Using the wizard i get to step3 .. then nothing happenes.
Trying direct in asdm but the only interface i can choose is "--None Unnamed-"
How do i get any further ?
/PerSolved this by configuring the failocer interface by cli
-
Asa failover & SSL vpn license question
with a failover pair, if you want to purchase an SSL license, do you have to purchase the same license for each one, or can they 'share' a license since only one will ever be active?
Steven,
You must purchase license for each and every device that you want to enable SSL Feature. It does not matter if the chassis is in active or standby mode in failover, you need a separate license.
Regards,
Arul
*Pls rate if it helps* -
Cisco ASA - 2 Site to Site routes needed for failover -Is possible?
3 physical sites. 2 ASA 5510 (routing mode_). 3rd site is in between ASA sites. 2 different connections. Depending on which link goes down, a certain set of Network Lists for Site to Site VPN is needed to place the 3rd site subnets where they belong depending on which link dies. The tunnels all work. Here is my wonder: Can I automate this somehow in my environment (all Cisco 3750/3560/2960) so that I can leave both tunnels in place so that if either link dies, the appropriate tunnel is picked for failover? Running 8.03 code on ASA. Using EIGRP (love that protocol). Anyone have any ideas?
You can implement failover or loadbalancing . Use this configuration examples for your configurations.
http://cisco.com/en/US/products/ps6120/tsd_products_support_configure.html
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