Difference between pages "SuperFetch" and "Talk:Linux Logical Volume Manager (LVM)"

From ForensicsWiki
(Difference between pages)
Jump to: navigation, search
(External Links)
 
(Created page with "Should we change :To make the volume group known to the system :vgexport $VOLUMEGROUP to :To make the volume group known to the system :vgimport $VOLUMEGROUP ? vgexport ma...")
 
Line 1: Line 1:
{{Expand}}
+
Should we change
  
SuperFetch is a performance enhancement introduced in [[Microsoft]] [[Windows|Windows Vista]] to reduce the time necessary to launch applications. An expanded version of the [[Prefetch]] files found in Windows XP, they record usage scenarios and load resources into memory before they are needed. Those resources can be loaded into physical memory and extra memory provided by [[ReadyBoost]].
+
:To make the volume group known to the system
 +
:vgexport $VOLUMEGROUP
  
== Configuration ==
+
to
  
Because SuperFetch appears to leave a system with no available memory, some users turn it off to create the appearance of having more free memory. The feature can be configured by changing the <tt>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters\EnableSuperfetch</tt> [[Registry]] key [http://www.codinghorror.com/blog/archives/000688.html]. A value of zero disables SuperFetch, one enables it for booting only, two for applications, and three for both applications and boot. This setting can also be changed using the Services console, <tt>services.msc</tt> [http://tiredblogger.wordpress.com/2007/03/27/superfetch-not-so-super-for-gaming/].
+
:To make the volume group known to the system
 +
:vgimport $VOLUMEGROUP
 +
?
  
== File Formats ==
+
vgexport makes volume groups ''unknown'' to the system, vgimport makes exported volumes ''known'' to the system. See also [http://www.tldp.org/HOWTO/LVM-HOWTO/recipemovevgtonewsys.html this]. You should also remember, that both vgexport/vgimport alter the data on the physical device. I also added "loop" option to the mount command example, since "-o ro" may alter the data in the file system (replay the journal, etc) [[User:.FUF|.FUF]] ([[User talk:.FUF|talk]]) 10:19, 7 May 2014 (CDT)
 
+
Data for SuperFetch is gathered by the <tt>%SystemRoot%\System32\Sysmain.dll</tt>, part of the Service Host process, <tt>%SystemRoot%\System32\Svchost.exe</tt>, and stored in a series of files in the <tt>%SystemRoot%\Prefetch</tt> directory [http://www.microsoft.com/technet/technetmag/issues/2007/03/VistaKernel/]. These files appear to start with the prefix <tt>Ag</tt> and have a <tt>.db</tt> extension. The format of these files is not fully known, there is available unofficial partial specification [http://blog.rewolf.pl/blog/?p=214] and open source (GPL) dumper for .db files [http://code.google.com/p/rewolf-superfetch-dumper/]. Some information can be gleaned from these files by searching for [[Unicode]] [[strings]] in them.
+
 
+
The SuperFetch feature is seeded with some basic usage patterns when the operating system is installed [http://channel9.msdn.com/showpost.aspx?postid=242429].
+
 
+
== External Links ==
+
* [http://en.wikipedia.org/wiki/Windows_Vista_I/O_technologies#SuperFetch Wikipedia: Windows Vista I/O technologies - SuperFetch]
+
* [http://channel9.msdn.com/showpost.aspx?postid=242429 Channel 9 Interview with Michael Fortin of Microsoft on SuperFetch]
+
* [http://www.informationweek.com/news/showArticle.jhtml?articleID=196902178 Microsoft Predicts The Future With Vista's SuperFetch] from Information Week
+
* [http://jessekornblum.com/presentations/dodcc08-2.pdf DC3 Presentation: My You Look SuperFetching]
+
* [http://code.google.com/p/rewolf-superfetch-dumper/ Open source Ag*.db files dumper]
+
* [http://blog.rewolf.pl/blog/?p=214 SuperFetch file format - partial specification]
+

Latest revision as of 11:19, 7 May 2014

Should we change

To make the volume group known to the system
vgexport $VOLUMEGROUP

to

To make the volume group known to the system
vgimport $VOLUMEGROUP

?

vgexport makes volume groups unknown to the system, vgimport makes exported volumes known to the system. See also this. You should also remember, that both vgexport/vgimport alter the data on the physical device. I also added "loop" option to the mount command example, since "-o ro" may alter the data in the file system (replay the journal, etc) .FUF (talk) 10:19, 7 May 2014 (CDT)