VMware VIEW COMPOSER 2.5 - ARCHITECTURE Manuale Utente Scaricare il pdf (Pagina 24)

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

VMware View 4.5, and VMware View Composer 2.5

Table 9. Disks needed for RAID 5, RAID 10, RAID 6

Item

Value

Total disk IOPS for RAID 5 (R5IO = HI × %R + HI×4×%W)

36,900

Number of SAS drives alone (R5IO/180)

205

Number of NL-SAS drives alone (R5IO/80)

462

Total disk IOPS for RAID 10 (R10IO = HI×%R +

HI×2×%W)

24,300

Number of SAS drives alone (R10IO/180)

135

Number of Flash drives alone (R10IO/2500)

Number of NL-SAS drives (R10IO/80)

304

Total Disk IOPS for RAID 6 (R6IO = HI×%R + HI×6×%W)

49,500

Number of SAS drives alone (R6IO/180)

275

Number of NL-SAS drives alone (R6IO/80)

619

In keeping with the same IOPS and to increase performance or capacity, four SAS drives can

be replaced with 9 NL-SAS, 125 SAS drives can be replaced with 9 Flash drives, and 125 NL-

SAS drives can be replaced with 4 Flash drives. For a mix of 68% SAS, 1% NL-SAS, and 31%

Flash, we need the disks as shown in Table 10 for various RAID options.

Table 10. Disks in storage tiering

Storage IOPS

36900 (RAID 5)

49500 (RAID 6)

24300 (RAID 10)

SAS drive count

140

192

NL SAS drive count

Flash drive count

When considering the storage size of virtual desktops, VMware View Composer reduces the

size required by using linked clone technology. Linked clones are dependent virtual machines

linked to the replica virtual machine. A replica virtual machine is a thin provisioned copy of

the master virtual machine. We deployed a 20 GB hard disk for the operating system to the

master virtual machine. The files occupy 13 GB and thus the replica virtual machine disk size

is 13 GB.

In our desktop pool, we use a file share on the VNX array to host the user profile and data. A

disposable disk that contains the temporary files and windows paging file is used to

minimize the expansion of delta disks and thus reduces the refresh frequency to the virtual

machine.

The size of a virtual desktop is the size of the delta disk + 2*memory size of the virtual

machine + 2 MB for internal disk + disposable disk size + log size.

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VMware VIEW COMPOSER 2.5 - ARCHITECTURE Manuale Utente Pagina 24

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