VMware VIEW COMPOSER 2.5 - ARCHITECTURE Manuale Utente Scaricare il pdf (Pagina 23)

EMC Infrastructure for Virtual Desktops Enabled by EMC VNX, VMware vSphere 4.1,

VMware View 4.5, and VMware View Composer 2.5

Table 7 provides a summary of the memory required per host.

Table 7. Required memory per host

Case

RAM/host min

required

(Complete

Cluster)

RAM / host min

required (Cluster

with one node

down)

RAM/ host used

on this solution

1000 User Cluster

91 GB

103 GB

96 GB

500 User Cluster

46 GB

52 GB

48 GB

We used 1,536 GB in total for hosting 2,000 virtual desktops. In a typical case, 1.5 GB per

desktop will not be available and will be using 2 GB and it would require 4,000 GB in total.

Still, virtual desktops can provide better bootup time compared to traditional PCs.

Network

Based on the workload, we found one virtual machine requires approximately 18 Mb/s. So, a

100 Mb/s card can support five to six virtual machines per NIC, a 1 Gig NIC can support 50-60

virtual machine per NIC and a 10 Gig NIC can support 500-600 virtual machines per NIC. The

Converged Network Adapter (CNA) running at 50 percent bandwidth can support 250-300

virtual machines per CNA.

Note: This is just a rough estimate and we must always watch for the network load and look

for the percent packet drops. If the value is high, check the network configuration and it might

be the time to consider adding another NIC. In our solution, we used two CNAs per host to

provide fault tolerance. For 2,000 virtual desktops, we used 2×8×3= 48 NICs. In a traditional

desktop scenario, 2,000 desktops require 2,000 network interface cards.

Storage

The number of spindles required for hosting 2,000 user desktops is calculated using both the

IOPS requirement and the capacity needed. Based on the workload, we observed 8.3 IOPS

per virtual desktop on average. The maximum and 95

percentile is based on the time

interval of the data. The sizing on the average IOPS can yield good performance for the virtual

desktops operating in a steady state. However, this leaves insufficient headroom in the array

to absorb high I/O peaks. To combat the issue of I/O storms, there should be two to three

times the average to absorb that load. Table 8 details the IOPS requirement and Table 9

describes the disks needed by various RAID levels to meet that IOPS.

Table 8. IOPS requirement and disks needed (multiple RAID scenarios)

Item

Value

Number of Windows 7 desktops

2,000

IOPS per Windows 7 virtual machines

Total host IOPS (HI)

18,000

% Read

% Write

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 62 63

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