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• Move virtual machine hard disk to a separate physical hard disk for better performance?

  - by joeeoj

  I have a dual-core machine with the host OS and many guest virtual OSs. Although I have 8GB of RAM, I notice a slowdown when I turn some virtual machine on (and it takes only 1GB RAM). I was told that I should move virtual machine hard disk file to a separate (another) physical hard drive in my PC to get better performance. This way the head of the hard disk would not have to jump from the virtual OS to the host OS as each hard drive would have its own head to deal with the OS: hard drive 1 head for host OS and hard drive 2 head for guest OS. Is this true? Should I get another hard disk only for virtual machine hard disk files?

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• 32bit Application Memory Usage on 64bit Windows 7

  - by Brian

  I have an early 2012 Macbook Pro with and Intel I7 processor and 16 gigs RAM running Windows 7 Professional 64bit via Bootcamp. I work in Geographical Information Systems as a programmer so most of the applications I am running are 32bit Applications, but tend to use a lot of resources (i.e. ArcGIS, SQL Server Express, Visual Studio, etc.). I have been noticing that when I have multiple instances of either the same 32bit application or different 32bit applications and they are all working on hefty processing tasks, I am still only topping out at about 30% memory use. I understand 32bit applications are limited to less than 4gb RAM, but I assumed that one instance could use its own 4gb while another instance could use another 4gb to take full advantage of all the memory I have installed. Can anyone explain how this works and how I can get my applications to take advantage of all my memory via running multiple instances?

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• FreeNas running on ESXi - sometimes gets very slugish.

  - by Luma

  Hello everyone, I have a ESXi server (dual quad core, 8GB of DDR3 ram, 6x 1TB WD Blacks running in RAid 5 on the PErc 6/i controller. I have a 64bit freenas VM running, on this VM I keep about 200Gigs of stuff that my windows machines access. every now and then the throughput of this VM just dies, for example right now it can't even handle streaming a song and when I tried to transfer a folder the speed goes from 10-400KB/s. Might I add at this point that the ESXi box has dual gigabit network cards plugged into a good solid gigabit switch and other linux and windows VM's are just fine I have seen speeds over 90MB/s (frequently) The server still has ram left over (plenty actually) and cpu is very low (500-1000mhz) any ideas what could cause this? thanks. Luc

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• How is memory allocated in ESXi server?

  - by Samselvaprabu

  We have an ESXi 4.1 server with 48 GB RAM. For each VM, we are allocating 4GB of memory. Since the server will have 13 virtual machines, my manager thinks this is wrong. I am going to explain to them that ESXi will actually manage memory itself, but they asked me how much memory I allocated for the ESXi server itself. I did not allocate any (I have not even heard of an option for allocating memory for the ESXi server itself). How is memory allocated for ESXi server? How does it over-allocate/distribute RAM among virtual machines without issue?

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• como se que esta funcionando AWE?

  - by adan851018

  Tengo un servidor con 8GB de RAM de 32 bits, instale windows server 2003 enterprise y sql server 2005 enterprise, el Sistema Operativo reconoce los 8GB, pero el Sql Server solo usaba 1.6 GB de memoria, entonces agregue al boot.ini el parametro /PAE y en Sql Server le habilite AWE de 1GB a 5GB, despues de reiniciar el servidor el Sistema que usa la BD estaba mas rapido mejoro bastante, pero en memoria el Sql Server solo usa 100 MB, veo la cantidad de memoria usada en el Administrador de Tareas de Windows, y no se si esta funcionando AWE o que sucedio? Rough translation: I have a server with 8GB of RAM 32-bit, install windows server 2003 enterprise and sql server 2005 enterprise, the operating system recognizes the 8GB, but the SQL Server only using 1.6 GB of memory, then add to boot.ini the parameter / PAE and will enable AWE Sql Server 1GB to 5GB, after rebooting the server using the database system was faster, the better lot, but in memory the SQL Server only uses 100 MB, I see the amount of memory used in Manager Windows Tasks, and not if AWE is running or what happened?

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• How can I receive more traffic? My VPS fails!!!

  - by qtrix

  I have a web site - photo gallery. About 400 photos. Site on Gallery 3. mySQL. Hosted on VPS from myhosting.com (CPU 1792 MHz, 2048 MB RAM). Everything seems to be ok, but there is one big problem. Once traffic reaches ~ 20 people (online) - website start loading really really slow. Actually website can't be loaded about 30-60 sec. What should I do? Buy more RAM / CPU on the same VPS? Move to a dedicated server or maybe myhosting.com just sucks? What do you recommend?

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• increase performance of virtual machines on the 27" imac

  - by evan

  I'm using a 27" iMac (i7, 8GB RAM) at work and normally run two or three virtual machines at the same time, which hurts the performance of each virtual machine. I've learned on these forums the best way to increase virtual machine performance (aside from RAM) is to have them running on a separate hard drive from the one the OS is on. Of course with the iMac you can only have one hard drive and not even an SAS or solid state drive (well you could probably take it apart and put one in yourself but I wouldn't be permitted to do that). That being said, do you think it would help to run one or more virtual machines from a firewire external drive (or a usb 2.0)? Thanks for your input!

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• Installed 4GB memory but Windows XP 32 bit only reporting 2GB?

  - by AnthonyWJones

  I've just taken an existing XP Pro 32 bit system that had only 0.5GB of memory installed and maxed it out to 4GB. The BIOS reports the 4GB ram however when XP is booted and I look at the computer properties only 2GB of RAM is reported. Can anyone explain this? Before we go up any blind allys the /3GB switch is not the answer here, I have no need for a single process to use more the 2GB of memory. I'm wondering if the the 32 bit XP Pro is deliberately limited to 2GB. I seem to remember seeing an excellent table on a Microsoft site listing all the various SKUs of Windows and what each one was limited to. However I can't seem to find that table now.

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• Installed 4GB memory but Windows XP 32 bit only reporting 2GB?

  - by AnthonyWJones

  I've just taken an existing XP Pro 32 bit system that had only 0.5GB of memory installed and maxed it out to 4GB. The BIOS reports the 4GB ram however when XP is booted and I look at the computer properties only 2GB of RAM is reported. Can anyone explain this? Before we go up any blind allys the /3GB switch is not the answer here, I have no need for a single process to use more the 2GB of memory. I'm wondering if the the 32 bit XP Pro is deliberately limited to 2GB. I seem to remember seeing an excellent table on a Microsoft site listing all the various SKUs of Windows and what each one was limited to. However I can't seem to find that table now.

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• How can I receive more traffic? My VPS fails!!!

  - by Vic

  I have a web site - photo gallery. About 400 photos. Site on Gallery 3. mySQL. Hosted on VPS from myhosting.com (CPU 1792 MHz, 2048 MB RAM). Everything seems to be ok, but there is one big problem. Once traffic reaches ~ 20 people (online) - website start loading really really slow. Actually website can't be loaded about 30-60 sec. What should I do? Buy more RAM / CPU on the same VPS? Move to a dedicated server or maybe myhosting.com just sucks? What do you recommend?

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• Choosing A Power Supply [closed]

  - by Geeks On Hugs

  Possible Duplicate: Power Supply Capacity Formula How can I check if my system needs more PSU power? I'm not sure if it's OK or not to ask a hardware question here. If not please let me know a good place but I've always got good info here so I thought I'd give it a shot. I'm custom building a new workstation for coding (Linux/Eclipse). How do I determine how much power the power supply needs? I'm building a mini ITX system on a budget and so I need to get as small as possible that is sufficient. I'll have a mini itx mobo with on board wifi and bluetooth, 8 GB RAM, an Intel i3 3.1 Ghz processor, 64 GB SSD and a slim optical drive. In the future I might add a descrete GPU, 16 GB RAM, 128 GB SSD. What is the minimum power I need and how do I calculate that?

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• Rail's FileStore with Linux Disk Caching or RAMdisk?

  - by Yo Ludke

  I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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• What affects video encoding speeds?

  - by Pig Head

  FRAPs doesn't compress its videos when you record, so the files are enormous. In a long recording you can get up to a few hundred gigabytes. Obviously, usually you would need to convert/compress them. What affects the speed of this? I don't think the RAM does, as when I converted 600 gb my RAM usage only went to 6 gig, but the processor was at 100%, which is surprising as I have a 6 core processor @ 3.46 ghz. Would clock speed or cores help the most?

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• PC is very slow

  - by Appoos

  Hi All, My Windows XP system is very slow. I tried all possible ways of improving the performance. But now luck. I've 4GB RAM and AMD Phenon XII B53 processor. I don't see any applications consuming CPU resources. But the Page File usage is 4.18 GB(System Managed size in MyComputerPropertiesPeformance). There is enough RAM available, but still why OS is using Page File? How can I improve the Page File usage? Please help me.

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• Supermicro MBD-X9DRL-IF-B and 8 X Hynix 4Gb DDR3 ECC dont boot

  - by Avi Keinan

  I have a custom build server with 2 Xeon E5-2609 and Supermicro MBD-X9DRL-IF-B. Right now the server has 4X Hynix 4Gb 2Rx8 PC3L-10600R-9-10-B0 HMT351R7BFR8A. and its working great. We baught another 4 from the same series of memory, when we installed all the ram (4 sticks already installed and we added 4 new sticks) the server didn't boot. When we replaced the current memory with the new memory - the server did boot. Right now we are in a problem because we need to extend this server ram but the motherboard don't run with 8X4Gb. Any ideas why? I have attached a picture with one of the current memory stick and one of the new memory stick. Thanks in advence.

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• Do virtual machines perform better on the host HDD or USB drive?

  - by Jeremy Ricketts

  The question I'm asking is kind of general, and I'll give more specifics about my specific setup. Here's the main question though: Do virtual machines generally perform better on the host HDD or is it better to operate them from an external disk? My specific setup: A Macbook Pro with a nearly full internal SATA drive that spins at 7200. On this system I'm running large programs like Photoshop and some other RAM-intense applications. I've dedicated 2 of my 8 gigs of RAM to my VMware Fusion virtual machine, which runs Windows 7 and Visual Studio, sits on the same drive. When that thing boots up, my system really starts crawling. I have an external USB (specifics of that drive are here) which I'm thinking about moving the VM to. Obviously a USB drive is slower than my internal HDD, but maybe having two operating systems using the same disk is WORSE than putting one of them on a separate (albiet slower) disk. This a bad idea?

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• How to make a vm scale when demand for resource increases

  - by Cray XT3

  i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes first vm reaches nearly 100% CPU and others under 25% or even less. So is there a way in which vm can get cpu from other vms when they are not actually using it or utilization is under 25%.Same in the case of RAM also. I am not sure whether i am mentioning Cloud here. Initially i would like to give every vm a single VCPU,but can scale up to 8 or more by taking cpu from other vms if they are not using it. Is there any kind of tool that makes vm to scale its resources when demand increases. Is cloudstack and openstack designed for these kind of purpose or is that just a GUI to manage VMs.

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• How to disable VGA on new server... reversibly?

  - by Javawag

  Strange question here. I have a server with 1GB of RAM, however when booted this shows as 768MB. I've discovered the reason for it – and that is that it has an unboard graphics card which shares memory with main RAM. Running Ubuntu Server, it doesn't actually ever use anything graphical – it's all set up to be SSH'd into and therefore there's no need to use the VGA. I believe there may be a setting to switch off VGA/graphics card in BIOS, but my question to you guys is: is this recommended? and if I turn it off, then how would I turn it back on again in BIOS (given that with it off, I wouldn't be able to see the option to turn it on as there would be no graphics output!!)?

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• PC shut downs automatically after a second

  - by emzero

  I have this not-so-old computer that's not being used for a year or so. Specs: Motherboard: ASUS PN5-E SLI CPU: Intel Core2Duo E4300 RAM:2x2GB SuperTalent DDR2-800 VGA: Zogis GeForce 7950GT PSU: Vitsuba San-55-S 550w HD: No hardrives yet When I power on the computer, everything seem to start, but right away the whole system shuts down. I've removed and changed the RAM sticks, take out the VGA, everything I could think of. So what could it be causing this? The PSU? The motherboard is dead? The CPU? Any help to isolate the problem will be useful. Thanks PS: Please don't close the question, this could be helpful to anybody having a similar problem, even with different hardware.

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• Windows 7 Recurring Blue Screens: MEMORY_MANAGEMENT 0x1A

  - by Chris C.

  I have recurring BSODs that really have me scratching my head. Here's a look at the errors: MEMORY_MANAGEMENT 0x1A (ntoskrnl.exe) - I've seen this 9 times since April 2012 NTFS_FILE_SYSTEM 0x24 (Ntfs.sys) - this one's new, happend 4 days ago BAD_POOL_HEADER 0x19 (win32k.sys) - also new, happened 7 days ago My system specs: Intel Core i5 2500K @ 3.30GHz ASUS Sabertooth P67 Motherboard (Rev 2) * RMA'd my Rev 1 due to recall 16GB (4 x 4GB) Kingston HyperX 1600 MHz DDR3 RAM 2 x 640GB Western Digital Caviar Black 64MB SATA HDD EVGA NVIDIA GeForce GTS450 1GB PCI-E 2.0 Graphics Card I've got Windows 7 Home Premium and it's completely patched. I'm also running Microsoft Security Essentials, which is up-to-date and always present. I've run MemTest86+ from a USB drive for up to nine hours, giving my RAM a total of 6 passes, and it didn't detect a single error. I've used chkdsk in Windows 7 to scan the C:/ drive on boot (twice) and it found no problems. How can I find out what's causing all these blue screens?

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• How can I create a consistent snapshot of tmpfs?

  - by netvope

  How can I create a consistent snapshot of tmpfs or any RAM disks?

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• Making the most of dual channel DDR2: how do I arrange the sticks?

  - by andrz_001

  I've searched online, but I can't find anything definitive that will put me at ease. I turn to superuser. This is how I have the RAM sticks arranged now: To make the most of the RAM and the dual channel capability, it occurred to me that perhaps I have the sticks arranged incorrectly. Should I move the stick in the DDR2_2 slot one over--to the adjacent, red slot? I appreciate any suggestions. (BTW, can something in BIOS tell me whether I'm running at "optimal" memory speeds??) edit: I'm running Windows XP SP3, 32-bit. Thanks.

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• Need Help Debugging BSOD

  - by nmuntz

  For the last few days I've been getting a BSOD at least once a day. Apparently the crash has been caused by ntkrpamp.exe and searching on google has revealed that the issue seems to be related to bad RAM. I have run memtest and my RAM modules have no errors on them. I'm pretty sure the issue is related to drivers, but I can't figure out which one. I'm not an expert in interpreting the output of windbg so any pointers would be greatly appreciated. Here is my analysis with WinDbg. It was too long to paste it here. One strange thing i noticed is that my Windows XP is in Spanish (SP3) and ntkrpamp.exe copyright info seems to be in portuguese. Not sure if that could be an issue, perhaps i have the wrong ntkrpamp.exe... Thanks a lot in advance

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• Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

  - by Travis

  I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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• Understanding ESXi and Memory Usage

  - by John

  Hi, I am currently testing VMWare ESXi on a test machine. My host machine has 4gigs of ram. I have three guests and each is assigned a memory limit of 1 GB (and only 512 MB reserved). The host summary screen shows a memory capacity of 4082.55 MB and a usage of 2828 MB with two guests running. This seems to make sense, two gigs for each VM plus an overhead for the host. 800MB seems high but that is still reasonable. But on the Resource Allocation Screen I see a memory capacity of 2356 MB and an available capacity of 596 MB. Under the configuration tab, memory link I see a physical total of 4082.5 MB, System of 531.5 MB and VM of 3551.0 MB. I have only allocated my VMs for a gig each, and with two VMs running they are taking up almost two times the amount of ram allocated. Why is this, and why does the Resource Allocation screen short change me so much?

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