11 1.Storage Design 1.2Examining Shared Storage Fundamentals o Traditionally, local storage has been used in a limited fashion with V Sphere p because so many of vSphere's advanced features-such as vSphere HA VSphere DRS, and vSphere FT--required shared external storage With vSphere Auto Deploy and the ability to deploy ESXi im ades directly to rAM at boot time coupled with Host profiles to automate the configuration of the ESXi Host, in some environments local storage isn't necessar 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
2 1.Storage Design 1.2Examining Shared Storage Fundamentals a No Local Storage? No Problem! What if you don't have local storage?(Perhaps you have a diskless blade system, for example. u There are many options for diskless systems, including booting from Fibre Channel/iSCSI SAn and network-based boot methods like vSphere Auto Deplo a There is also the option of using USB or SD Card boot, a technique that we've employed on numerous occasions Both Auto Deploy and USB boot give you some flexibility in quickly reprovisioning hardware or deploying updated versions of vSphere 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
13 1.Storage Design 1.2Examining Shared Storage Fundamentals a Shared storage is the basis for most VSphere environments because it supports the VMs themselves and because it is a requirement for many of vSphere's features Shared external storage in SAN configurations(which encompasses Fibre Channel, FCoE, and iSCSI) and NAS(NFS)is always highly consolidated a This makes it efficient o Similar to the benefits of physical-tovirtual consolidation with regard to CPU and memory, SAN/NAS or VSAN can take the direct attached storage in physical servers that are 10% utilized and consolidate them to eighty 80% utilization 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
14 1.Storage Design 1.2Examining Shared Storage Fundamentals a The elements that make up a shared storage array consist of external connectivity, storage processors, array software, cache memory disks, and bandwidth External Connectivity o The external (physical) connectivity between the traditional storage array and the hosts(in this case, the ESXi hosts) is generally Fibre Channel or Ethernet, though InfiniBand and other rare protocols exist. The characteristics of this connectivity define the maximum bandwidth(given no other constraints, and there usually are other constraints)of the communication between the eSXi host and the shared storage array o External connectivity is typically referred to as front-end or FE connectivity and most often tied to a fabric for distributed sharing and scalability purposes. 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn
5 1.Storage Design 1.2Examining Shared Storage Fundamentals a The elements that make up a shared storage array consist of external connectivity, storage processors, array software, cache memory disks, and bandwidth Storage Processors o Different vendors have different names for storage processors, which are considered the brains of the array o They handle the l0 and run the array software. In most modern arrays, the storage processors are not purpose-built application-specific integrated circuits(ASICs)but instead are general-purpose x86 CPUs o Some arrays use PowerPC, some use specific ASICs, and some use custom ASICs for specific purposes o But in general, if you cracked open an array, you would most likely find an Intel or AMD cpu 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn