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• Best way to duplicate databases nightly?

  - by Margaret

  Hey all We just got two new servers, that are running Windows Server 2008. The intent is to make the machines pretty much identical, copying the content of the master to the slave on a nightly basis, so that if anything fails, the second copy can stand in immediately. It doesn't need to be up-to-the-minute mirroring, though I suppose that wouldn't hurt if performance is not affected. The two machines will, amongst other things, each be running an instance of SQL Server 2008. The aim is to duplicate the databases on the master down to the slave on a nightly basis. Unless I'm misunderstanding, the slave databases in mirrored databases require the primary to be present to work correctly; I'm hoping for some solution where we have a second machine that can be up and running with minimal downtime if the first one falls over. Am I misunderstanding mirroring? Is that the best way to do things, or should I use some other mechanism? If so, what?

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• XPP-32 over W7-64 on music production laptop

  - by quarlo

  I need to upgrade my laptop and need high performance for music production (recording and mixing). My audio interface manufacturer seems to be unable to successfully convert their drivers to 64-bit. I do not trust a virtual machine to handle real-time audio recording at low enough latency so ... I would like to install XP Pro 32-bit on a separate partition and dual boot since most of the machines that can handle this application now ship with Windows 7 64-bit flavors. I'd like to transit to 64-bit over time assuming M-Audio does eventually get a handle on 64-bit drivers, but really need to ensure that I can stay at 32-bit for now. Does anyone have any experience with this or something similar?

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• What's the best solution for file sharing in my case? DAS or NAS?

  - by jakub

  I want to have in my network small, cheap and energy efficient server with will be fully customizable (Gnu/Linux, OpenBSD). What is more I want to have big, redundant storage in my network and access to it via server. I have already small terminal without hard drive (no SATA/PATA, one drive on USB) which works fine. I don't want to buy big server, or to use regular computer for that. It's not cheap. I thought about a small case (ITX?), and cheap computer in this with SATA ports, but I cannot find anything interesting :( I thought about NAS in network and server independently and booting server from NAS, I'm not sure which technologies will be good for that, and I don't know what with performance. Direct connection to NAS through network from workstation is next pro for that. What do you think about DAS? It will be good for that?

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• What desktop chipsets support AMD's Rapid Virtualization Indexing?

  - by netvope

  Rapid Virtualization Indexing (RVI) is a hardware virtualization feature that can potentially give significant performance improvement. Intel's equivalent is Extended Page Tables. See http://en.wikipedia.org/wiki/Rapid_Virtualization_Indexing for more details. My question is: Does RVI require motherboard or chipset support? If yes, what desktop chipsets support it? I've ordered a Phenom II CPU (which supports RVI) but I haven't bought the motherboard. I'll install XenServer or VMware ESXi (which both support RVI) on the new computer.

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• Is there a Linux-compatible R/C simulator that works with real radios?

  - by Norman Ramsey

  My Dad flies radio-controlled (R/C) aircraft. He used to run a simulator called "RealFlight" which allowed him to connect his actual radio to his computer and fly simulated craft. He learned enough to fly actual planes, but he wants to move up from "trainer" aircraft to higher-performance craft. After some crashes, he'd like to go back to the simulator for a while. The catch: he's given up Windows and is now running Ubuntu. Question: is there an R/C flight simulator that Runs on Ubuntu? Allows you to connect your radio and use it to control the simulator, preferably through a USB port?

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• ATI video cards - unable to use entire monitor (1080p)

  - by Walter White

  Hi all, I have a Dell s2409w, 24" 1080p monitor. With nVidia, I would plug-in the monitor and voila, it automatically knew it was 1080p (1920x1080). I have both a Windows laptop and Ubuntu laptop. Neither is capable of using the fullscreen even though the monitor reports the input is 1080p. I am connecting the monitors via HDMI, is there a 'special' setting I am missing to make this work? Otherwise, I like the performance of my ATI video cards, the drivers seem to be stable and reliable. Thanks, Walter

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• Snow Leopard: Optimization

  - by Shyam

  Hi, I have bunch of questions: I have a Mac network, which has five Mac's. Right now, they are individually getting software updates. Is there a way to download the patches/security updates in a single place (repository) and point all machines to this location? Personally, I have tools like Monolingual and Onyx, but are there tools you could recommend that affect the performance of the Operating System positively? Tweaks would be nice. Links and pointers, would be really appreciated. I've read about Time machine, is there a way to backup all machines to a network drive using this tool? Thanks!

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• Overcrowded Windows XP Folders

  - by BlairHippo

  I know that, technically, an individual Windows XP directory can hold an immense number of files (over 4.29 billion, according to a quick Google search). However, is there a practical ceiling where too many files in one directory starts having an impact on reads to those files? If so, what factors would exacerbate or help the issue? I ask because my employer has several hundred XP machines in the field at client sites, and the performance on some of the older ones is getting "sludgy." The machines download and display client-defined images, and my supervisor and I suspect that our slacktastic approach to cache management could be to blame. (Some of the directories have tens of thousands of images in them.) I'm trying to gather evidence to support or contest the theory before spending time on a coding fix.

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• Optimal Memory Configuration for Dell PowerEdge 1800 (Windows Server 2000 32bit)

  - by David Murdoch

  I am upgrading the memory on a Dell PowerEdge 1800 Server running Windows Server 2000 (32 bit). My Computer Properties currently reports "2,096,432 KB RAM" (4 modules @ 512MB each). Crucial.com scan reports: "Each memory slot can hold DDR2 PC2-5300 with a maximum of 2GB per slot. Maximum Memory Capacity:  12288MB Currently Installed Memory:  2GB Available Memory Slots:  2 Total Memory Slots:  6 Dual Channel Support:   No CPU Manufacturer:  GenuineIntel CPU Family:  Intel(R) Xeon(TM) CPU 2.80GHz Model 4, Stepping 1 CPU Speed:  2793 MHz Installed in pairs of modules." We will be completely replacing the old 512 MB modules. Will there be any performance difference between installing 4 modules @ 1GB vs. 2 modules @ 2GB?

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• Linux bash: when to use egrep instead of grep?

  - by Michael Mao

  Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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• Ubuntu 9.10 x86_32 with PAE causes graphics issues, mainly slowness

  - by widgisoft

  I've tried the 64bit version and found I was constantly hitting a brick wall trying to get 32bit stuff to run; I'd previously used PAE on 9.04 without any issues so figured I'd give it a shot. However, on 9.10 it seems PAE or the process of enabling PAE breaks the nvidia drivers/module somewhat as performance is terrible; I can't even enable desktop effects and there's lots of artifacting on random controls. Disabling the pae image and rebooting fixes the issue however I'm then stuck with "only" 2.7Gb of ram and unable to use the full 8gb that's installed. Is there somthing special I need to do when using pae and nVidia drivers or should I be using 64bit and just figure out how to force run 32bit packages? :-p

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• Kernel config file generator

  - by lisak

  Hey guys, could please anybody recommend some kind of kconfig generator that would trim modules and built-in stuff that is not needed according to current hardware ? The best I have found is this : http://lkml.org/lkml/2008/9/16/290 I don't care about compilation time and the amount of modules that are not built-in. I'm concerned about performance. I don't know how much memory and runtime is wasted on huge kernels with almost everything possible. I'm a java developer and I don't know what most of the modules and drivers are for. So there is not much I can disable and be sure that I don't screw it up. Thanks in advance

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• Buying Dual Monitors of different size and resolution

  - by rutherford

  I'm about to go choose a dual monitor setup: 1) Is there any reason why I can't just walk out and buy the two TFT screens I like (a wide screen and a 'portrait' screen) and combine them? Mainly wide screen would be for gaming, and portrait for browsing. I'd want the desktop stretching from one to the other (ie drag pointer, apps from one screen to the other) 2) Also do I need separate gfx cards for each monitor or can one cover both? any performance cost? 3) And can I have separate background images for each, seeing as they'll be different resolutions?

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• Explorer.exe keeps crashing if effects are enabled

  - by Allende

  The explorer.exe keeps crashing before every minute after starts when all the effects are activated. These are the details of the error: Problem signature: Problem Event Name: InPageError Error Status Code: c0000185 Faulting Media Type: 00000003 OS Version: 6.1.7600.2.0.0.256.48 Locale ID: 1033 Additional Information 1: a7aa Additional Information 2: a7aa91f17ea749d42a4de3b390fa5b3d Additional Information 3: a7aa Additional Information 4: a7aa91f17ea749d42a4de3b390fa5b3d Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt I suspect there's a problem with my hard drive ('cause I already have to format/install twice before this error) but not pretty sure why if I disable all the effect (Performance options) help to stop the issue. Anyway if someone have any idea, thanks. I already replace shell32.dll and explorer.exe using the windows 7 dvd Laptop Model: ProBook 4520s Windows Version: Profesional 32 bits. My regards

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• How to make IIS7 stop adding etag to response headers?

  - by user20028

  For performance reasons, I'm using expire headers for static files (adding long expiration periods like 50 years or so). Now I'm trying to get rid of etag headers which are automatically added by IIS7. I've done some searching but it seems harder than what I thought (there doesn't seem to be a straight forward way). I found some workarounds but they all use httpmodules (which I'm keeping as a last resort). I strongly prefer to not get the etag header added in the first place. Did anyone manage to do this? Thanks

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• Website content hosted with Google. Good or bad?

  - by user305052

  I recently decided to host my styles.css and various scripts on Google Docs and link them into my website. I also have all my images hosted through Picasa so that they too will load much faster and consistently across users. My site has most of its traffic from Japan, Africa, and South America, so I assume there will be a performance boost for my users since my server is hosted in Hong Kong. I (in Canada) have measured my load times to be half of what they used to be. Basically it's a free CDN for my personal stuff. I'm not too sure about all of this yet, so here's my question: what are the caveats of this setup? EDIT: So after rummaging through the ToS of both Picasa and Docs, there doesn't seem to be anything wrong with this kind of use.

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• Is ODBC on Windows 2003 slower than on Windows 7?

  - by nbolton

  I am seeing some MSSQL 2005 performance issues, and I am trying to diagnose the cause. I am using SQL profiler to gather query execution times. Both the client (using ODBC), and the SQL server are running on Windows 2003. I am also using Windows 7 (client) with a different Windows 2003 server to compare results. Windows 7 client / Windows 2003 server: SQL management studio: 393ms Through ODBC: 215ms Windows 2003 client: SQL management studio: approx 155ms Through ODBC: 3145ms ... in both cases, I'm running SQL management studio on the client. To me, these figures suggest there's something wrong with the ODBC client on the Windows 2003 server. On Windows, I see that the ODBC "SQL Server" driver is version 6.01.7600.16385 but on Windows 2003, it is 2000.86.3959.00 (by default). Could this be the problem? Is it possible to update an ODBC driver?

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• What is the difference between sar -B verses sar -W

  - by Mark

  I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following: What is the correlation between the two sets of statistics. When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with? Which statistic is more closely related to system performance Thanks

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• 1000 HZ linux kernel necessary if I have tickless and high resolution timer?

  - by Bob

  I am trying to improve performance on my server. I have a few processes that need low jitter (less than 10ms variance). I have a load average of 4 maximum on an i7-920 (4 physical cores, 8 with HT). There are about 10 processes ranging from 40% to 90% of a core user mode. System usage is 3% total. Total CPU usage is 80% max. Will setting the kernel from 100hz to 1000hz improve the jitter if tickless and high resolution timers are already set? This page seems to indicate it still does something. https://lkml.org/lkml/2009/4/28/401 How about changing from voluntary (PREEMPT_VOLUNTARY) to preemptible (PREEMPT)?

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• Experiences using VLC for video-on-demand streaming? (VLM)

  - by StackedCrooked

  I'm considering my options for implementing a VOD service. Until recently my choices seemed to be either Wowza or Darwin, but now I discovered VLM, which looks really cool. I am going to stream MPEG4 H.264 video with AAC audio. I'm probably going to use the RTSP protocol, but I'm willing to use HTTP as well (after reading this article). Can anyone comment on his or her experiences with VLM? How does it compare to Darwin or Wowza? Is it stable and worthy of production use? Are there any limitations or performance problems?

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• Achieving/maxing out 1GBPS connectivity on a nginx server

  - by Ansell Cruz

  This page (http://www.remsys.com/nginx-on-1gbps) claims that it can max out a 1gbps line using JBOD setup and no raid. Currently I'm on a 1gbps dedicated port and I'm on raid 10 (4x2TB - the disks that comes with 100tb.com servers). Currently I'm only peaking at 500-550mbps. wa% would show something around 20% everytime. I'm looking into maxing out this 1gbps port because I have an unmetered service from them. Do you guys think that the page that I referenced would be better than my current raid setup? Do you guys have any other suggestions on how to max out the performance of this server? TYI.

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• email spam filering in bridging

  - by User4283

  I've a mail server, which handle multiple domains. Due to concern of spam and mail server performance. I've configured another machine which will be in bridging and mail server would be behind that it. How can i filter spam emails in bridging server without running any smtp services. Scenario Internet +------+ Spamfilter Server (in bridging mode) +---------+ MailServer SmartHost will work for outgoing email. In this scenario i can filter all incoming emails. There is also another option of DNS which i don't want to use.

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• Does anybody wish to help a poor researcher publish a paper?

  - by Mihai Todor

  I don't know if this is a good place to beg for help, but here it goes: basically, I need to run a secure recommender system simulation (C++ console application) in order to meet tonight's deadline, and the faculty's server grid decided to go offline. I could really use something like 10+ (actually, about 16 would be required to meet the deadline) virtual instances of some Linux that has GMP installed... Ideally, they should all have the same specs, because a part of the simulation will represent performance benchmarks. If my question is inappropriate in any way, I kindly ask the administrators to remove it.

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• IPsec Policy Agent flip-flopping demand start/auto start in Windows Server 2008?

  - by Steve Wortham

  Looking through the event logs on my web server I noticed a strange pattern. The following events have been occurring over and over again, always back to back: The start type of the IPsec Policy Agent service was changed from demand start to auto start. The start type of the IPsec Policy Agent service was changed from auto start to demand start. Each one produces event id 7040 from the Service Control Manager. And sometimes this will happen 20 times in one minute. Any idea what would cause this? I've been trying to pinpoint an intermittent performance problem for the past several days and this is the most peculiar thing I've found so far. I'm running Windows Server 2008, SQL Server 2008, and ASP.NET 3.5 w/ MVC 1.

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• MacBook Pro - 72k vs 54k rpm drives - Heat and Noise

  - by webworm

  I am looking at a new 15" MacBook Pro for development purposes. I am planning to run a Virtual Machine for about 50% of my work (Windows 7 x64, IIS, SQL Server, and VS 2010). The upgrade from a 54000 rpm drive to a 72000 rpm is only $45. From what I understand the faster rotational speed of the 72000 rpm drive will help virtual machine performance. However, I am concerned that additional heat and fan noise might be an issue. I will be running mostly on A/C power so decreased battery life is not a major concern for me. Since I would be running with a Core i7 processor which gives off a fair amount of heat already I was wondering if it might be best to stay at 54000 rpm for the hard drive. What do you all think? Thanks!

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