how come use Smarts Paginns in Hyper-V

the feature is all about allocation relocating dynamic memory that might be going to waste


as someone who has actually created three publications top top Hyper-V, ns tend come get the majority of Hyper-V-connected questions from readers. Some of the Many Usual inquiries that i get to be pertained to Hyper-V"s smart paginns feature.

You are watching: Where is the smart paging file located on a windows server by default?

the majority of civilization it seems ~ to have ns misunderstanding the smart paging is regarded ns home windows Pagefile. In actuality, ns home windows PageFile and also the Smart Paging File are extremely various native a another.

the windows PageFile ins a heritage operation system ingredient the ins left over from the days when physics storage wtogether really expensive. Ns idea was that hard disk storAge Gap could it is in supplied to compensate for shorteras that physics RAM. Today the windows PageFile is additionally used to accommoday crash dumns information.

Hyper-V"ns Smart Paginns Documents ins different. In bespeak to understand also wcap ns Smarts Paginns Data ins and also wcap ins does, friend have to understand also a little bit around Hyper-V"s dynamic storage feature.

Dynamic storage ins a function that is draft come compensate because that a hold server"ns physical storage limitations. Rather than assigninns a static amount that storage to a online machine, ns online machine supplies ns storage the ins requirements wislim ns limits set by ns administrator. Ns concept behind this concept is that utilizing dynamic storage reducens storage consumption, As such allowing the organize come handle a better number of digital machines. If for instance a VM ins assigned 4GB that RAM, but only demands 3.5GB, climate fifty percent a gigabyte that storage ins being wasted. That half a gigabyte can be better provided ~ above another virtual machine.



If you watch at number 1, girlfriend can watch ns dynamic storage Settings because that a virtual machine. Together friend have the right to see in ns figure, dynamic storage is not permitted through default. If girlfriend desire a online machine come usage memory dynamicallied then ns dynamic storage function must be enabled.

number 1. Dynamic memory ins not allowed through default ~ above Hyper-V digital machines

as girlfriend look in ~ the figure above, tbelow to be three Setups the friend have to pay attention to. The initially that these Setups ins the startuns RAM. In thins certain figure, dynamic memory ins not being used, therefore the startup ram worth represents the amount that storage that is gift staticallied assigned to the virtual machine. If dynamic storage to be permitted however, climate ns startuns lamb worth would certainly reflect the amountain that storage that ins Originally assigned come ns digital machine prior to the dynamic memory feature boosts or decreasens the storage consumption.

ns various other two Setups come make Keep in mind that are the minimum lamb and the best ram settings. Together ns namens imply, this Settings reflect the least and Most physical storage the will ever be allocated come ns virtual machine.

therefore wcap doens every one of this need to execute via the Smart Paginns File? Well, here is the yes, really necessary part. Alert in ns number over the ns startup lamb and also the minimum lamb to be 2 sepaprice values. Thins implies the if a digital machine is no utilizing every one of the memory the ins wtogether Initially alsituated climate Several of the storage have the right to be released.

therefore why no collection ns startuns ram and ns minimum lamb to the same amountain that memory? Tright here are two reasons. First, part operation Solution percreate a inspect come make certain the a specific amountain the storage ins present. Second, ns boot procedure is reresource intensive. Part operation Equipment consuns even more storage in ~ boot tins 보다 castle execute as soon as the device is idle.

Since a digital machine might relax Some of its physics storage after ~ ns boots process has completed, ns organize server"ns physical storage deserve to end up being over committed. This suggests that the online equipments jointly use more startuns ram 보다 wcap is physicallied set up in ns host. Friend have the right to obtain away with this if all of the virtual makers to be booted in ~ different time and to be configured to relax unprovided storage ~ booting, yet it becomes a trouble if a VM ins rebooted.

Imagine that a organize has actually been over cursed and also every VM ins making use of the bare minimum amountain of memory. Currently imagine the among ns VMs ins rebooted. Top top reboot, ns VM will certainly attempt to case ns startuns RAM, i m sorry ins not easily accessible Because the memory ins overcommitted. Thins ins wbelow ns Smart Paginns Data comes right into play. Rather than enabling the VM boot come fail, the Smart Paginns File ins supplied come comprise for shorteras in RAM. Unlike the home windows PageDocuments however, ns Smarts Paging Data is just supplied by the boots process. It ins no used because that routine memory paging operations.

as friend have the right to check out in number 2, Hyper-V permits girlfriend come configure ns Smarts Paging File"ns location. The Smart Paging Documents is stored via the VM through default, however deserve to it is in redirected come one more area if necessary.

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figure 2. the Smarts PEra File deserve to it is in recommand to one more location.

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Normally the deerror place ins fine, yet if ns VM lives top top an SSD array, girlfriend can think about placing the Smart Paging Data oncome a much less expensive storPeriod location.


about ns Author

Brien Posey ins a 20-tins Microsofns MVp with years of It experience. Together a freelance writer, Posey has written thousands of write-ups and added to a number of dozen books top top a broad array of Ins topics. Before going freelance, Posey was a CIO because that a national chain the hospitals and also health care facilities. He has actually likewise offered as a network administrator for Several of ns country"s biggest insurance money companies and because that ns room that Defense at Fort Knox. In enhancement to his continued work-related in IT, Posey has actually spent the critical a number of years actively train as a commerciatogether scientist-astronaut candidate in ready come fly on a missitop top to study polar mesospheric clouds from space. Friend deserve to folshort his spacetrip train top top hins Web site.