Setting Up Desktop and Application Pools in View

Table 3‑9. Impact of Windows 7 and Windows 8 Services and Tasks on OS Disk Growth and IOPS When OS Is Left
Idle (Continued)
Service or Task Description
Default
Occurrence or
Startup
Impact on
Linked-Clone OS
Disks Impact on IOPS
Turn Off This
Service or Task?
Windows Registry
Backup
(RegIdleBackup)
Automatically
backs up the
Windows registry
when the system is
idle.
Every 10 days at
12:00 am
Medium.
Each time this task
runs, it generates
registry backup
files.
Medium. Yes.
There is no need for
Windows Registry
Backup. To restore
registry data, you
can use the View
Composer refresh
operation.
System Restore Reverts the
Windows system
to a previous,
healthy state.
When Windows
starts up and once
a day thereafter.
Small to medium.
Captures a system
restore point
whenever the
system detects that
it is needed. When
the linked clone is
idle, this overhead
is small.
No major impact. Yes
Although its impact
is small, this task is
redundant if you
use View Composer
refresh to return OS
disks to their
original snapshots.
Windows Defender Provides anti-
spyware features.
When Windows
starts up. Performs
a quick scan once a
day. Checks for
updates before
each scan.
Medium to high.
Performs
definition updates,
scheduled scans,
and scans that are
started on
demand.
Medium to high. Yes, if other anti-
spyware software is
installed.
Microsoft Feeds
Synchronization
task
(msfeedssync.exe)
Periodically
updates RSS feeds
in Windows
Internet Explorer
Web browsers.
This task updates
RSS feeds that
have automatic
RSS feeds
synchronization
turned on. The
process appears in
Windows Task
Manager only
when Internet
Explorer is
running.
Once a day. Medium.
Affects OS-disk
growth if
persistent disks
are not configured.
If persistent disks
are configured, the
impact is diverted
to the persistent
disks.
Medium Yes, if your users do
not require
automatic RSS feed
updates on their
desktops.
Disable Scheduled Disk Defragmentation on Windows 7 and Windows 8 Parent
Virtual Machines
Before you create linked clones, you must disable scheduled defragmentations on Windows 7 and Windows
8 parent virtual machines. Windows 7 and Windows 8 schedule weekly disk defragmentations by default.
Repeated defragmentation operations significantly increase the size of linked-clone OS disks and do not
make disk access more efficient on linked clones.
When you create a linked-clone pool from the parent virtual machine, the linked clones share the replica's
disk. Subsequent defragmentation operations do not affect the replica's disk, which is read-only. Instead,
defragmentations expand each clone's OS disk.
Setting Up Desktop and Application Pools in View
42 VMware, Inc.