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  • Bandwidth sizing for simultaneous RDP sessions

    - by Gareth Marlow
    We're doing some DR scenario planning which will require up to 150 users to RDP into their desktop machines (mainly running Windows XP) over our VPN. We have a 2mbit uncontended internet connection at the moment but there's scope to upgrade this and also to use a secondary SDSL line to give us more bandwidth. Typical bandwidth figures I've seen suggest to plan for 64kbps per session, which works out to 9.6mbps in total. I'd like to know: Does anyone have any real-world data which would support these estimates? Are there any operational 'gotcha's that we need to be aware of? Thanks!

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  • Why does storage's performance change at various queue depths?

    - by Mxx
    I'm in the market for a storage upgrade for our servers. I'm looking at benchmarks of various PCIe SSD devices and in comparisons I see that IOPS change at various queue depths. How can that be and why is that happening? The way I understand things is: I have a device with maximum (theoretical) of 100k IOPS. If my workload consistently produces 100,001 IOPS, I'll have a queue depth of 1, am I correct? However, from what I see in benchmarks some devices run slower at lower queue depths, then speedup at depth of 4-64 and then slow down again at even larger depths. Isn't queue depths a property of OS(or perhaps storage controller), so why would that affect IOPS?

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  • who free's setvbuf buffer?

    - by Evan Teran
    So I've been digging into how the stdio portion of libc is implemented and I've come across another question. Looking at man setvbuf I see the following: When the first I/O operation occurs on a file, malloc(3) is called, and a buffer is obtained. This makes sense, your program should have a malloc in it for I/O unless you actually use it. My gut reaction to this is that libc will clean up its own mess here. Which I can only assume it does because valgrind reports no memory leaks (they could of course do something dirty and not allocate it via malloc directly... but we'll assume that it literally uses malloc for now). But, you can specify your own buffer too... int main() { char *p = malloc(100); setvbuf(stdio, p, _IOFBF, 100); puts("hello world"); } Oh no, memory leak! valgrind confirms it. So it seems that whenever stdio allocates a buffer on its own, it will get deleted automatically (at the latest on program exit, but perhaps on stream close). But if you specify the buffer explicitly, then you must clean it up yourself. There is a catch though. The man page also says this: You must make sure that the space that buf points to still exists by the time stream is closed, which also happens at program termination. For example, the following is invalid: Now this is getting interesting for the standard streams. How would one properly clean up a manually allocated buffer for them, since they are closed in program termination? I could imagine a "clean this up when I close flag" inside the file struct, but it get hairy because if I read this right doing something like this: setvbuf(stdio, 0, _IOFBF, 100); printf("hello "); setvbuf(stdio, 0, _IOLBF, 100); printf("world\n"); would cause 2 allocations by the standard library because of this sentence: If the argument buf is NULL, only the mode is affected; a new buffer will be allocated on the next read or write operation.

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  • Backup Exec 12.5 or 2010? [closed]

    - by Chris Thorpe
    Backup Exec 2010 has just dropped, and I'm about to implement a new BEWS infrastructure, complete with CALs and new central servers. When I specced this up last year, I ignored 2010 and focused on Backup Exec 12.5, since it's a mature product. In previous experience, major released of BE had numerous technical issues and seemed to improve significantly at the first service pack. However, our refresh cycle on the backup infrastructure is slow, the main driver usually being lack of support for some new server type (in this case, ESX has driven our current upgrade need). With this in mind, I'm wondering if Backup Exec 2010 should be my first choice, as it'll last longer under current support than 12.5, which will approach EOL soon. Has anyone got any perspective they could add to this? Right now, I'm leaning towards biting the bullet and going with 2010.

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  • Create certificate for a client app in .NET

    - by galets
    I'm looking for a server app to be routinely generating certificates for client applications using self-signed root. Is there any streamlined process in .NET to programmatically generate those certificates? I can, of course, keep spawning makecert or openssl, but I was looking for more programmatic, in-memory method, when you just get X509Certificate on output. If someone got a code snippet, can you please share?

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  • Recover from a corrupted couchbase install

    - by jcolebrand
    We have a couchbase installation on a Windows 2008 R2 server that got corrupted (this was from before my tenure, now I want to clean it up). There is no add-remove entry in the Programs and Features list. There is no active service in services.msc. However, something still thinks Couchbase is installed. Shy of wiping the box (we aren't quite to "redeploy test environment servers at the push of a button" altho I'm working on it), how can I ensure that all remnants of couchbase installs prior are now gone? I believe the previous install was in the Couchbase 2.x range, but it may have been 1.7+ Running the installer again gives "Installer needs to update registry value in order to upgrade from the previous version. Please run installer again to continue."

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  • Ruby zlib deflate massive data

    - by Bub Bradlee
    I'm trying to use Zlib::Deflate.deflate on a massive file (4 gigs). There are obvious problems with doing that, the first of which being that I can't load the entire file into memory all at once. Zlib::GzipWriter would work, since it works with streams, but it's not zlib compression. Any ideas?

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  • Rebuilding /etc/rc?.d/ links

    - by timday
    A regular filesystem check on a Debian Lenny system triggered an fsck, and that nuked a handful of links in the /etc/rc?.d hierarchy (unfortunately I didn't keep a list). The system seems to boot and run normally, but I'm worried its storing up trouble for the future. Is there an easy (fairly automatic) way of rebuilding this piece of the system ? As I understand it, the links are generally manipulated by package postinst scripts using update-rc.d (and I haven't made any changes from the installed defaults). Without any better ideas, my plan is one of: Diff a listing with another similar system to identify which packages need their links repairing. Wait until the system is upgraded to Squeeze (hopefully not too long :^) and assume the mass package upgrade will restore all the missing links.

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  • (simple) linux HA with vmware vsphere?

    - by derhelge
    I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of those Linux VMs are "single point of failure"-configured, which means in the case of a Web-Server: LAMP, storage, etc. everything on this machine. This was very simple and in case of a failure (in the last years: kernel panics or apache crashes) a simple reboot triggered by a script did it. But the problem is: How to upgrade/maintain the w(eb-)application or the underlying OS without downtime? This wasn't really managable and i did this in the early morning ;) How can i achieve a "simple" High-Availability Cluster now? I thought of: DRBD with heartbeat with 2 VMs. And for the storage a RDM (raw device mapped) LUN and change the read-write-permissions for both VMs. Is this a good idea? Anyone has a better solution?

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  • Multiple PXE boots on the same subnet for RIS and WDS

    - by Tim
    We are looking to migrate off our existing server 2003 sp2 machine, running RIS (which I know is WDS as of Server 2003 Sp2, but to be clear..) with a bunch of legacy RiSETUP images to a Server 2008 r2 box. Because the change in architecture (x86 to x64), and a limitation of the Server 2008 upgrade path that won't allow mixed-mode WDS services to be upgraded, I am forced to look at running Server 2003 for RIS and Server 2008 R2 for WDS for Windows 7 on the same network. The problem I'm facing is how to deal with both PXE services at the same time? I'd still like the existing RIS server to be available for production use, but start working on WDS for deploying Windows 7. Is there a way to have a sort of PXE "chooser" ? Or some other mechanism to be able to select which server the client should download the boot image from? Thanks!

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  • freebsd does not recognise that php was installed via ports

    - by Alistair Prestidge
    I have php 5.2.12 installed on FreeBSD 8.0-STABLE. It was installed from ports and I am trying to upgrade it to 5.3.2. However for some reason my system is not recognising that php was installed via ports. When I run "pkg_version" the list does not include php it does however include all the extensions that I have installed. I have even tried to do "make deinstall" on "/usr/ports/lang/php5" it told me that the port had been deinstalled but php still appears to be working correctly i.e "php -v" works any ideas on how this port has become de attached from the ports system? and how I can get the ports system to recognise that it installed php?

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  • Adding Parsekit To An Xcode Project

    - by Garry
    I am trying to add the Parsekit framework to my OSX Xcode project. I've never added a 3rd party framework before and I can't get it to work right. I dragged the included Xcode project into my 'Groups & Files' pane and chose to Add it to my project. I then dragged Parsekit.framework underneath the Link Binary With Libraries heading. Then I double-clicked my target app and added Parsekit as a Direct Dependency. I also added libicucore.dylib as a Linked Library (as it says to do this on their site). Finally, in the Build settings tab of my target info I set the Header Search Paths to /Users/path/to/include/directory and the Other Linker Flags to -ObjC -all_load. Running this as a debug build work fine with no errors. However, when I build my app to release and then try to run the executable created, the app fails to load with the following error message: MyApp cannot be opened because of a problem. Check with the developer to make sure myApp works with this version of Mac OS X. Here is the dump from the crash reporter: Process: MyApp [11658] Path: /Users/Garry/Programming/Xcode/Mac/MyApp/build/Release/MyApp.app/Contents/MacOS/MyApp Identifier: com.yourcompany.MyApp Version: ??? (???) Code Type: X86-64 (Native) Parent Process: launchd [135] Date/Time: 2010-05-24 17:08:08.475 +0100 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6Interval Since Last Report: 133300 sec Crashes Since Last Report: 3 Per-App Crashes Since Last Report: 3 Anonymous UUID: DF0265E4-B5A0-45E1-8B71-D52A27CFDDCA Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dyld Error Message: Library not loaded: @executable_path/../Frameworks/ParseKit.framework/Versions/A/ParseKit Referenced from: /Users/Garry/Programming/Xcode/Mac/MyApp/build/Release/MyApp.app/Contents/MacOS/MyApp Reason: image not found Model: MacBookPro5,5, BootROM MBP55.00AC.B03, 2 processors, Intel Core 2 Duo, 2.53 GHz, 4 GB, SMC 1.47f2 Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB Memory Module: global_name AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.10.91.27) Bluetooth: Version 2.3.1f4, 2 service, 2 devices, 1 incoming serial ports Network Service: AirPort, AirPort, en1 Network Service: Ethernet Adaptor (en6), Ethernet, en6 Serial ATA Device: Hitachi HTS545025B9SA02, 232.89 GB Serial ATA Device: HL-DT-ST DVDRW GS23N USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0x24400000 USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0x26500000 USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x04500000 USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0237, 0x04600000 USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8213, 0x06110000 After building the app, in addition to the executable file, Xcode is also creating a file called MyApp.app.dSYM. Any idea what that is?? I am developing with Xcode 3.2.2 on an Intel MBP running 10.6.3. Many thanks for any help offered.

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  • iphone: caching and updating xml fields

    - by pJosh
    Thanks for your help. Here I have another question. I get the data through XMLParsing, now I want to store it in iphone's cache, and the XML Fields are updates every 12 hours.how can i check that XML Fields are change or not? and how can I store the data in iphone's cache memory so that evry it does not has to interact with web. Can anybody please help me???

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  • Subclassing a window from a thread in c#

    - by user258651
    I'm creating a thread that looks for a window. When it finds the window, it overrides its windowproc, and handles WM_COMMAND and WM_CLOSE. Here's the code that looks for the window and subclasses it: public void DetectFileDialogProc() { Window fileDialog = null; // try to find the dialog twice, with a delay of 500 ms each time for (int attempts = 0; fileDialog == null && attempts < 2; attempts++) { // FindDialogs enumerates all windows of class #32770 via an EnumWindowProc foreach (Window wnd in FindDialogs(500)) { IntPtr parent = NativeMethods.User32.GetParent(wnd.Handle); if (parent != IntPtr.Zero) { // we're looking for a dialog whose parent is a dialog as well Window parentWindow = new Window(parent); if (parentWindow.ClassName == NativeMethods.SystemWindowClasses.Dialog) { fileDialog = wnd; break; } } } } // if we found the dialog if (fileDialog != null) { OldWinProc = NativeMethods.User32.GetWindowLong(fileDialog.Handle, NativeMethods.GWL_WNDPROC); NativeMethods.User32.SetWindowLong(fileDialog.Handle, NativeMethods.GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(new WindowProc(WndProc)).ToInt32()); } } And the windowproc: public IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam) { lock (this) { if (!handled) { if (msg == NativeMethods.WM_COMMAND || msg == NativeMethods.WM_CLOSE) { // adding to a list. i never access the window via the hwnd from this list, i just treat it as a number _addDescriptor(hWnd); handled = true; } } } return NativeMethods.User32.CallWindowProc(OldWinProc, hWnd, msg, wParam, lParam); } This all works well under normal conditions. But I am seeing two instances of bad behavior in order of badness: If I do not close the dialog within a minute or so, the app crashes. Is this because the thread is getting garbage collected? This would kind of make sense, as far as GC can tell the thread is done? If this is the case, (and I don't know that it is), how can I make the thread stay around as long as the dialog is around? If I immediately close the dialog with the 'X' button (WM_CLOSE) the app crashes. I believe its crashing in the windowproc, but I can't get a breakpoint in there. I'm getting an AccessViolationException, The exception says "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Its a race condition, but of what I don't know. FYI, I had been reseting the old windowproc once I processed the commands, but that was crashing even more often! Any ideas on how I can solve these issues?

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  • How to have file/folder icons use a relative path?

    - by Memor-X
    On my portable hard drive I set icons for almost every organized folder. All these icons are located in an Icons folder located on the root directory of the same hard drive. When I change the drive letter of the hard drive (well I don't, windows does automatically sometimes) these icons are lost. So far this hard drive is assigned to F: While it's not a problem now, it may becomes a problem if I upgrade my computer or get a new one and the F: Drive is already taken up for something else. It's also annoying on networks where F: is mapped to a network drive.

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  • sql and web encoding problem

    - by Marki
    Guys, I've got an encoding problem I believe. I have upgraded from phpBB2 to phpBB3. The old databases were in latin1, the new ones have utf8 encoding. Already during the upgrade process some rows of the DB were only read partly into the new version, because of strange characters as it turned out. When I use PHP's mb_convert_encoding() function to convert those strings to UTF8 they end up e.g. as 0x0093, i.e. they must have been some kind of double quotes. Even after doing this conversion, they still show up as 0x0093 in the browser (the squares with 0093 in them when the browser does not know what to display). Can someone explain the problem here? I'm a little confused and afraid I don't see all the dependencies that need to work to have the correct encodings and the correct display thereof...

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  • USB resets with Ubuntu 9.10

    - by Grumbel
    Since the upgrade to Ubuntu 9.10 I have issues with getting USB device resets on my Maxtor OneTouch USB harddrive: Nov 9 20:54:37 localhost kernel: [32459.100021] usb 2-2: reset high speed USB device using ehci_hcd and address 4 Nov 9 21:54:37 localhost kernel: [36059.100017] usb 2-2: reset high speed USB device using ehci_hcd and address 4 Nov 9 23:24:37 localhost kernel: [41459.112025] usb 2-2: reset high speed USB device using ehci_hcd and address 4 The device itself continues to work fine, the resets however wake the device out of its sleep state and thus cause it to spin up, which is very annoying. Interestingly, as the log shows, the resets happen at pretty regular intervals (i.e. one hour or half an hour), not randomly. An USB card reader seems to have the same issues, while another USB harddrive from a different manufactor works fine on the same PC. What could be causing this and how could I fix it?

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  • How get page size from MemoryStream or Byte ?

    - by Nakul Chaudhary
    I have images of active report in database, when i get into bytes and convert into memory stream so it can pass to active report viewer then how i get paper size of paper display in active report? My code : Dim repmem As New System.IO.MemoryStream(rptBytes) repmem.Position = 0 Viewer1.Document.Load(repmem)

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  • Application Freezing after some idle time

    - by Rakib Hasan
    Hello, I am developing a software using C# 2.0 which uses about 200MB of memory and occasionally high CPU. The problem is, when i am leaving my machine idle for about 20-30 mins with the application running, after i come back and try to use the application, it freezes for about 2 mins, then becomes interactive. Why does this happen? Is there any way to avoid this? Thank you all. Regards, -Rakib

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  • Windows 8.1 fresh install with Windows 8 licence

    - by typ1232
    I purchased Windows 8 online from Microsoft a while ago. Today Windows 8.1 was released as a free update to Windows 8 users over the Windows Store. I was planning to do a fresh install of Windows 8.1 to have a clean system again and UEFI support because I got new hardware since the Windows 8 installation. So my questions are: Where do I get the ISO installation medium for Windows 8.1 64-bit? I tried this microsoft site where I initially got my Windows 8 ISO from, but when entering my Windows 8 key in the Windows 8.1 installer, it says the key is wrong. Even if I get the ISO, will my old key work? I'm concerned because it didn't work in their installer (see previous point) Do they seriously want me to reinstall Windows 8 and after that upgrade to Windows 8.1 through their Store?!

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  • 10,000 RPM HDD (WD VelociRaptor) vs SSD for OS?

    - by GiH
    I currently have a 10,00RPM 150GB Raptor that I use for Vista. I'm about to upgrade to Windows 7, and while doing that I thought I'd buy another drive and install Ubuntu 9.10 on it. I don't want to partition the current drive I have, but I don't need 150GB for another OS. So, I'm having trouble deciding whether its worth it to buy a 64 GB SSD at the same price point as the 150GB WD VelociRaptor? Or should I just get a 7,200 RPM drive for really cheap (around $50)? Would it be better to use an SSD for the OS than a mechanical drive? I could always get a 32GB SSD too... Oh, and I don't want to virtualize Ubuntu because I'm going to be testing to see the differences in networking and overall performance.

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