An administrator needs to establish that a database server is entitled to twice the CPU resources than a web server during CPU resource contention.
Which settings should the administrator change to accomplish this?
A. Set the database server’s CPU Shares to High and leave the web server’s CPU Shares at Normal.
B. Set the database server’s CPU Shares to High and change the web server’s CPU Shares to Low.
C. Set the database server’s Shares to High and change the web server’s CPU Shares value to a custom value of 500.
D. Set the database server’s Shares to a Custom value of 500 and leave the web server’s CPU Shares at Normal.
Correct Answer: A
Explanation/Reference:
Explanation:
Configuring resource shares specify the relative importance of a virtual machine (or resource pool) during contention. If a virtual machine has twice as many shares of a resource as another virtual machine, it is entitled to consume twice as much of that resource when these two virtual machines are competing for resources.
Shares are typically specified as High, Normal, or Low. For CPU shares these values equate to 2000 share for High, 1000 shares for Normal, and 500 chares for Low, with a 4:2:1 ratio, respectively. Thus configuring the database server’s CPU Shares to High while leaving the web server’s CPU Shares at Normal will ensure that the database server is entitled to twice the CPU resources than a web server.
Incorrect Answers:
B, C: Shares are specified as High, Normal, or Low. For CPU shares these values equate to 2000 share for High, 1000 shares for Normal, and 500 chares for Low, with a 4:2:1 ratio, respectively. Thus configuring the database server’s CPU Shares to High (2000 shares) while reducing the web server’s CPU Shares at Low or a custom value of 500 shares will result in a 4:1 ratio, which means the database server will be entitled to four times the CPU resources than a web server.
D: Setting the database server’s CPU share to a value of 500 is equivalent of setting it to Low. This means the database server will be entitled to half the CPU resources than a web server.
References:
http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-55-resource-management-guide.pdf Page 12
http://pubs.vmware.com/vsphere-50/index.jsp#com.vmware.vsphere.resmgmt.doc_50/GUID-C0D2EFAE-1FE4-4867-AC3F-3E70D9A9ED59.html