By Tim Mackey, J. K. Benedict
Choked with useful recommendation, this hands-on consultant presents priceless info you must so much successfully optimize and deal with the XenServer open resource virtualization platform. even if you run a modest set up of some blades or a number of international firm datacenters, this booklet makes a speciality of the main severe matters you are prone to come across whilst designing a XenServer deployment and is helping you deal with day by day administration initiatives. Tim Mackey and J.K. Benedict from Citrix structures, the corporate that manages XenServer, assist you to layout a deployment via most sensible practices, deployment blueprints, and set up instructions. The book's moment half positive factors concise, easy-to-implement recipes for daily administration, equivalent to consumer rights, backup concepts, and upkeep.
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Additional info for XenServer Administration Handbook: Practical Recipes for Successful Deployments
Example text
For example, if you write a single file at the start of the disk and another at the end of the disk, the middle isn’t allocated. info | 45 disks, it is very likely the filesystem the VM is using is sparsely allocated. This allows the disk to report low disk utilization because the unused portions of the disk can be represented as empty blocks. When using thinly provisioned disks, it’s important to understand how the filesystem is actually represented on disk and how unused file blocks are handled.
It has been our experience that, XenServer aside, having one or more bare minimum hosts to test internally before rolling out to production is of benefit to production. info | 41 better prepare, plan, and document what should be done going into production changes. In our test environments, we keep one or more hosts with the following “bare mini‐ mum” resources available before rolling out changes to our production-grade envi‐ ronments: • • • • • Multisocket/multicore AMD or Intel-based host 8 GB–12 GB of physical RAM 100 GB or more of spindle-based storage 1 or more gigabit-based networking cards Guest VMs that reflect those in a production environment As for production grade hardware and host requirements, this will be discussed fur‐ ther in Chapter 5.
Example 2-6. conf The output will either state “bridge” or “openvswitch,” but this is a powerful piece of information to have—especially in diagnosing XenServer pool issues where the vir‐ tual network fabric, or “backend networking,” is in question. Furthermore, there are some third-party Citrix products that may require that the virtual networking fabric is of one type or another. If it is found that a particular host needs to have its virtual network fabric switched, ensure all Guest VMs are halted (or migrated to another XenServer host), and issue the command listed in Example 2-7.
