Impact of Hadoop / Big Data Applications on Cluster Design
How does running Hadoop on an HA Cluster impact an existing cluster? Should I create a separate cluster for my Hadoop application VMs, or run them in an existing cluster? The case studies from VMWare...
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HA with moxa
Hi all, new in community! So I try to post my questions as clear as possible.we currently have 10 servers on differnt locations. All servers have incoming dials from modems with RS232, in average 8...
View ArticleWhat Triggers Share Values to Take Effect?
Resource pools take affect only during contention. But what is "contention" - does that mean resource pools take affect when cPU utilization on the host is 100%? 90%? When CPU ready time reaches a...
View ArticleDetermining if VMs can restart
I am attempting to help in a situation where the frankencluster design specification outlined by depping here was chosen to increase complexity, reduce consistency and risk availability. Multiple...
View ArticleHow to unprotected HA VM
Hello everybody I have configure a cluster with 2 esxi with the version 5.5u2 and a vcenter server on which I have activate the vSphere HA. By default, all the virtual machines associated to the...
View ArticlevSphere High Availability "Election" fails at 99% "operation timed out" at 1...
Hello, We had a system with 1 ESXi 5.1 host with local disks.Now we install redundancy by adding an ESXi 5.5 U2 host and a vCenter 5.5 appliance.After installing and adding everything to vcenter, we...
View ArticleVMWare HA Question
I am setting up a new HA environment for 2 ESXi hosts across 2 datacenters. This is my first time using VMWare HA and I am looking for advice, and have some questions for the community. Firstly, If I...
View ArticleOne Server License using 2 Servers?
Is it possible to use one Microsoft Windows Server 2012 R2 License on two separate physical servers if we are using them for HA? Using vSphere with two physical servers 4 virtual machines. Would I need...
View ArticleApplication start script when failover
Dear Gurus, When VMware HA vm1 fails over to vm2, we want to start application automatically, but our VMware engineer tells me the only way is to add the start script into booting script. But I do not...
View Articlevm not moved while entering maintenance mode
vcenter 5.02 x esxi 5.0 I have to migrate them manually to another host which was successful.
View ArticleFT Question
Scenario is as below:-=============2 esxi hostVM with FT enabled I know that vm running on host A if down then secondry vm running on host B resume the job. I know if secondry FT enabled VM is down...
View ArticleCluster utilization and self-provisioning
I am moving to a cloud infrastructure with VCAC for self-provisioning. How does this impact my target utilization for my HA cluster? Previously I was targeting running each cluster at 80% utilization...
View ArticleMandatory Affinity rules and evacuation
I have an ESXi 5.5 host called ESXi1 in a host DRS group called "ESXi1 Host group". No other ESXi hosts are in that group, but there are 4 other ESXi hosts in the cluster. I have a VM called "VM1" in...
View ArticleAffinity rules and HA
When do I need affinity rules for an application with a 3 tiered architecture with web front end, application tier and database on different VMs, and when do I NOT need them? What are the performance...
View ArticleAffinity rules and maintenance mode
I have a VM with a VM to Host mandatory "must" affinity rule that it must run on one and only one ESXi 5.5 server.I go to try to put that ESXi host in maintenance mode.If I power the VM with the...
View ArticleRecommendation for additional isolation address
I'm using the default configuration with just one isolation address which is the default gateway. 1. Should I always specify an alternate isolation address?2. Should the alternate address always be...
View Articlesyslog.log messages with regard to VpxaHalCnxHostagent
hi, i need a sharing of your precious knowledge. After upgrading vmware server to 5.5 from 5.1, vmware keeps generating messages as follows.Syslog daemon repeats similar pattern like followings. what...
View ArticleClusters Sharing Datastores
Hi all,Are there any performance or other impacts of sharing datastores between 2 HA clusters within the same vcenter (all vsphere5)?For example if you separated the hosts into separate clusters due to...
View ArticleRAM shares per VM
If a VM is not in any resource pool (except the default root resource pool for the cluster), it gets assigned 1000 CPU shares per virtual CPU. How many RAM shares is it assigned per GB of VRAM?
View ArticleCPU usage and contention
I am attempting to run DRS clusters at 90% CPU utilization based on average peak. I am using resource pools. When will resource pool share values be enforced? At 100% utilization only or sometime...
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