SQL 2012 still on the use of affinity rules
Hey guys,.
I use SQL 2012 alwaya time on in a virtual, but so far, it is not configured as best practices and environment I wanted to change that.
At the moment I have no DRS rules in place so it can happen that two virtual machines running on the same host and it's something I want to avoid.
However, my big problem is that I only got a SQL license for two hypervisors and best practices talked about four hosts who are needed to achieve my goal.
Here is what I intend to implement:
-Affinity rule machine virtual-VM to separate two virtual machines
-Affinity VM host rule which VM1 MUST run on ESX1
-Affinity VM host rule that VM2 MUST run on ESX2
This configuration is a good idea or could / should I do something different?
What I found that all the features how for example the evacuation and HA should still work?
There are many more ESX servers in this group and they will be used in the case of an outtage, right?
Also there is a dev environment that looks the same. I could include the hosts in the same VM-Host affinity rules or should I create new ones?
BTW. I am using vCenter and ESX 5.5.0.
Thank you very much!
See you soon
Nicolai
Affinity rules those you intend to sense. These rules will not be those virtual machines to be on the same host most of the time.
Note:
1 rule of VM host is configured as "SHOULD", in extreme cases, DRS can break these rules. However, in the next invocation of DRS, DRS will try to resolve the violations.
2. Note that: when you keep either the host in maintenance (ESX1 or ESX2) mode, you must manually migrate the VM to another host due to the virtual-VM anti rule machine affinity. DRS even in full auto mode, VM will not be migrated automatically. This will apply only if there are only 2 host in the cluster.
3. Yes, HA should well with that: however HA is not aware of the rules 'EXPECTED' and in the case of host failure it can not respect 'SHOULD' rule.
4 rule anti-affinite VM - VM can be sensitized HA using the advanced option. Let me know if you want to help with that.
5. Yes, failure of other hosts in the cluster will be used but please updated on impact due to rules & licenses.
6. "There is also an environment-dev which looks the same." I did not follow what exactly you mean here:
7 migration threshold settings DRS is also important.
8 DRS gives priority to the prevention of violations of anti-affinity rules machine virtual-VM that violations of rules of affinity. (it's just for your info.)
Nevertheless,.
1. If ESX1 falls down or affinity rule VM host that VM1 MUST run on ESX1 gets violated: VM1 can be migrated to other hosts in the cluster. As you have no licenses (more than 2) SQL, how it would be dealt with (I'm not very updated on the SQL licenses)
2 point above applies to the second rule of VM HOST as well.
Tags: VMware
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