VMware View Manager 4.5 Admin Manual page 58

VMware View Administrator's Guide
Table 4-7. Impact of Windows 7 Services and Tasks on OS Disk Growth and IOPS When OS Is Left Idle (Continued)
Service or Task Description
Windows Registry Automatically
Backup backs up the
(RegIdleBackup) Windows registry
when the system is
idle.
System Restore Reverts the
Windows system
to a previous,
healthy state.
Windows Defender Provides anti-
spyware features.
Microsoft Feeds Periodically
Synchronization updates RSS feeds
task in Windows
(msfeedssync.exe) Internet Explorer 7
and 8 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 7 or 8 is
running.
Disable Scheduled Disk Defragmentation on Windows 7 Parent Virtual Machines
Before you create linked clones, you must disable scheduled defragmentations on Windows 7 parent virtual
machines. Windows 7 schedules 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.
As a best practice, defragment the parent virtual machine one time, before you take a snapshot and create the
pool. The linked clones benefit from the defragmentation because they share the replica's optimized, read-only
disk.
58
Default
Occurrence or Impact on Linked-
Startup Clone OS Disks
Every 10 days at Medium.
12:00 am
Each time this task
runs, it generates
registry backup
files.
When Windows Small to medium.
starts up and once a
Captures a system
day thereafter.
restore point
whenever the
system detects that
it is needed. When
the linked clone is
idle, this overhead
is small.
When Windows Medium to high.
starts up. Performs
Performs
a quick scan once a
definition updates,
day. Checks for
scheduled scans,
updates before
and scans that are
each scan.
started on demand.
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.
Turn Off This
Impact on IOPS Service or Task?
Medium. Yes.
There is no need for
Windows Registry
Backup. To restore
registry data, you
can use the View
Composer refresh
operation.
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.
Medium to high. Yes, if other anti-
spyware software is
installed.
Medium Yes, if your users do
not require
automatic RSS feed
updates on their
desktops.
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