Understand HA and DRS ESX3.5 and VirtualCenter 2.5
We have ESX3.5 and VC2.5 with active HA/DRS. DRS in one of the clusters is in part mode.
We had a situation yesterday with a virtual machine in the cluster HA/DRS (a single pool of resources). One of our administrators needed for the replacement of a module faulty memory on one of the 3 hosts in the cluster. He emigrated manually all virtual machines on this host. Later, another administrator has a problem with one of the virtual machines in the same cluster and powered virtual machine and turn it back on. He emigrated virtual machine or somehow the virtual machine migrated to the host where there are no VMs located (one who has been to the module memory, replaced by the administrator earlier).
Note: because the Group was in part mode, I don't know why the virtual machine would automatically migrate to the host where did exist no VMs. I think, at best, a recommendation would have emerged instead. However, the virtual machine somehow back on the host where no. VMs must have existed.
Later that day, the first administrator SHUTDOWN (he has not put the host in maintenance mode) the host to replace the memory module. He did not check for if sure there were running VM on the host... After all, he had manually migrated them all out of the host as soon as possible. From here, things get a little blurry from newspapers and testimonials. But, from what I could tell, the only VM on the host of the judgment remained on the host computer and has been put off. This caused an alert and of course cause problems for our community of users which were on the virtual machine.
From what I've read on HA and DRS, HA uses a "worst case scenario" to determine the function of recovery. This is based on virtual machines running on the cluster, once one or more of the hosts in the cluster fails. This "worst case scenario" takes the reserve of CPU PLUS used of any computer running in the cluster virtual and the memory MOST used reserve and applies to all virtual machines running to calculate the total of the cluster resources... If I read that correctly. So, if the total is thus exceeded some migrating VMs won't be able to power on because they will not reach the requirements of admission control.
If my interpretation of the reading is correct, then this may explain why the VM on the host shudown not being able to save. Is this correct?
y at - it the events listed in the tab the cluster events & task say you something to the effect unable to power on the comments make for violation of the resource constraints?
Tags: VMware
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First_name last_name Salary City Description ID Test# Celina Rice 2344.78 Vancouver Manager 04 1 David Larry 7897.78 New York Manager 07 2 Jason Martin 1234.56 Toronto Programmer 01 1 Alison Mathews 6661.78 Vancouver Tester 02 1 James Cat 1232.78 Vancouver Tester 08 2 Robert Black 2334.78 Vancouver Tester 05 3 James Smith 6544.78 Vancouver Tester 03 4 Linda Green 4322.78 New York Tester 06 5
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