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  • Solaris TCP/IP performance tuning

    - by Andy Faibishenko
    I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck? PS I posted this on StackOverflow originally. One person suggested snoop and dtrace. dtrace seems pretty general - are there any additional pointers on how to use it to diagnose TCP issues?

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  • UDF filesystem -> Maximum number of files

    - by user978122
    I am considering partitioning a rather large hard drive with the UDF filesystem for an experiment, and would like to ask if anyone knows the maximum number of files, either by directory, or as a whole, that the UDF filesystem can handle? For some background, I looked at the JFS and XFS filesystems (NTFS has a limitation of the number of files per volume); however, since I run Windows, that's kind of out. UFD, on the other hand, does not appear to have these limitations, but then, I cannot really find any information on just how many files per volume the UDF file system supports.

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  • Skype 2.1beta for Linux and sound quality

    - by vava
    I've been using Skype 2.1beta for Linux with my bluetooth headset and quality of the sound is just awful. But not always though, if I call echo service, quality is acceptable, but when I call real people there's echo, sound is crippling, there's pauses, voice is unrecognizable, all sorts of quality problems in one call. If I use newest Skype under WIndows with the same headset to call to the same people, quality is more than normal. So, is there some settings I can tweak, like tell Skype which codec to use or maybe there's noise cancellation plugin for PulseAudio I can use or any other system setting I can try to play with?

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  • Problem starting Compiz: symbol lookup error for libdecoration.so

    - by AniDev
    I run Ubuntu 10.10 (Maverick). I had removed Compiz 0.8.x from my system so I could try out Compiz 0.9.x. I then decided that I wanted Compiz 0.8.x back, so I installed the packages from aptitude. Now, when I try to start Compiz, I get this error: compiz: symbol lookup error: /usr/lib/compiz/libdecoration.so: undefined symbol: decor_property_to_quads Using the command "readelf /usr/lib/compiz/libdecoration.so -s", I see that that symbol is present: 24: 00000000 0 FUNC GLOBAL DEFAULT UND decor_property_to_quads Aptitude reports that my Compiz core packages (like compiz, compiz-core, compiz-plugins, etc.) are at version 1:0.8.6-0ubuntu9.1. Does anyone have any ideas why Compiz is reporting this error, and/or what I can do to fix it? I cannot run Compiz, because this error causes Compiz to abort, even if the "Window Decoration" plugin is not enabled.

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  • RabbitMQ message broker unable to open unused port 61613

    - by mjn
    On a Windows Vista system, RabbitMQ fails to open port 61613 which is not used (as netstat and TCPView show). The server log indicates that it is possible to bind port 5672, but the next lines show the problem with port 61613. I have cleared all firewall settings and rebooted. Several times in the past this helped to solve the problem. But as the problem frequently reappears, I would like to know if there is somthing I am missing to solve its root cause. =INFO REPORT==== 29-Jun-2013::12:09:16 === started TCP Listener on [::]:5672 =INFO REPORT==== 29-Jun-2013::12:09:16 === started TCP Listener on 0.0.0.0:5672 =INFO REPORT==== 29-Jun-2013::12:09:16 === rabbit_stomp: default user 'guest' enabled =INFO REPORT==== 29-Jun-2013::12:09:16 === started STOMP TCP Listener on [::]:61613 =ERROR REPORT==== 29-Jun-2013::12:09:16 === failed to start STOMP TCP Listener on 0.0.0.0:61613 - eacces (permission denied) =INFO REPORT==== 29-Jun-2013::12:09:16 === stopped STOMP TCP Listener on [::]:61613

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  • Is Dell's server software bundle necessary? (Poweredge 2950 in my case)

    - by bwerks
    Hi all, Dell includes a fair amount of software with its servers, but I'm having a hard time determining from the documentation what each of them does, and whether or not I should install it. Dell's support site (unless I'm doing it wrong) seems fairly opaque to me and its offerings fairly unstandardized in terms of their usage, so if possible I'd like to stray away from them. Specifically, I'm curious if any of the features offered are duplicated in something like Microsoft System Center. For additional background information, I'm working with a Poweredge 2950 that was just rebuilt with an expanded raid-6, but initially I just installed Server 2008 R2 directly instead of using the Build and Update utility. There's nothing of use on it at the moment so I'm totally open to wiping it again.

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  • Events 1030 and 1006 in Windows 2003

    - by jab
    I've got a computer running Windows 2003 R2 Standard Edition Service Pack 2 and periodically (every 5 minutes) the systems generates 2 errors that can be seen in the event viewer. The codes of the events are 1030, 1006 that seems to be related to group policies... I don´t know if these events are realted to the perfomance of the system but anyway i would like to fix them. I've googled around and seems to be a common problem but i haven't found a solution for these events. Do you know how can be fix it? Thanks in advance

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  • Exchange ActiveSync does not work for one user

    - by jshin47
    One particular user in our system is unable to connect to Exchange ActiveSync via her iPhone. When I try to connect using my own credentials on her iPhone it works (everything begins syncing), but when I input her credentials, the Settings app verifies the credentials are correct but nothing syncs. For example, if I open Mail, no items are shown. When I attempt to force a sync, it says "Cannot connect to server." In Exchange 2010 Management Console the user is no different than the others. Exchange ActiveSync is set as "Enable" in Mailbox Features. EDIT: Alternatively, if there is some easy way to create a new useraccount/mailbox and copy all of the contents of the old one over, I bet it would work, and that would be fine as well. She is a Mac user so we do not have to worry about her Active Directory account.

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  • How to get wireless working (properly) with Sitecom Wireless USB micro adapter 300N on Windows 7?

    - by Timo
    The question says it all, but more detail follows ;) I've got a new computer that runs Windows 7 64-bits (Home Edition) and I'd like to connect it to my wireless home network (Sitecom wireless gigabit router 300N wl-352 v1 002) with a Sitecom wireless USB micro adaptapter 300 wl-352 V2 001. After installing the router (i.e. connected to the modem and power) and ensuring that wireless is indeed enabled, I've installed the driver of the USB adapter on the new computer described above. After the installation (drivers and utility on CD) completes successfull I rebooted my computer and inserted the USB adapter. After discovering the right network and connecting to it using the network key, a connection is succesfully made. (Using the Sitecom 300N USB Wireless LAN utility). In the LAN utility I can see that the signal strength is approximately 50% and connection quality is approximately 80%. Judging from these numbers I assumed that all was fine and started to use the connection (reading news on nu.nl, a dutch news site), but noticed that the connection was lost several times in a very short time span, but each time the connections was resumed, resulting in the 50/80 percent numbers described above. However, the website was not loaded completely and often a timeout would be reported. When inspecting the drivers through Device Management (Windows' Apparaatbeheer in dutch) there were no errors/warnings; everything seemed to be in order. In an attempt to solve this, I downloaded the latest drivers for the USB adapter, but the problems remained. Finally I tried to connect the computer with a Siemens Gigaset USB Adapter 108. This process was a troublesome since I had to download a driver (from the site above) and tell Windows (7) to use the Windows Vista driver when installing the new hardware, since there is (was) no Windows 7 driver available. This resulted in a usable connection, although not very stable when reconfiguring the router. Which took the form of selecting a different wireless channel on the router, even using the Sitecom utility mentioned above to check if there were other networks communicating on that channel (and thus picking a channel that was not used by other networks). Again no result when changing back to the Sitecom USB adapter. Note that this means (I think) that I could use the internet connection with the Siemens adapter, meaning the problem was not in the router. So: How to get wireless working (properly) with Sitecom Wireless USB micro adapter 300N on Windows 7? PS Sorry, but should be able to post one link, while I had links in place for the USB adapter, router and the siemens adapter in place as well, but I'm not (yet) allowed to post these... (The site says I can post one link, but only when no links are present will it allow me to post the question...)

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  • Unable to burn Windows ISO from Fedora

    - by user331947
    First of all, English is not my native tongue, so apologies for any mistakes. My computer recently started prompting that it can't launch Windows successfully. So I just choose start Windows normally. Then, I found that the startup freezes at the Windows screen (before the login prompt). I have tried rebooting several times and get the same results. So I just gave up. After few days, I tried to boot up my laptop again. This time it got to the desktop, but it's extremely slow and the icons on my Desktop don't show up. I decided to format the Windows partition and reinstall a new one. (It is usually faster that way since I kept my 400GB+ data on aother partition and programs and the rest in the same partition as Windows). The thing is I get the Windows disc at the moment (Traveling aboard). But I have a Windows 7 disc image on my hard disk. So, I downloaded Ubuntu 14.04 LTS, made a Live USB, and then try to burn the image from Ubuntu. But the program just freezes and I don't know why. I tried several times and it's still the same. So I tried using Fedora instead, just to see if it will work. The Disk Image Writer report something like this. Error unmounting /dev/dm-0: Command-line `umount "/dev/dm-0"' exited with non-zero exit status 32: umount: /: target is busy (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1).) (udisks-error-quark, 14) Also, I tried installing linux on the windows partition. The installation program freezes (both Ubuntu and Fedora). So, I thought that maybe something are wrong with my hard disk. I seek the solution on the internet and found that gparted can be used to format a partition. And it also froze at "Searching /dev/sda/ partition ...". I'm using Lenovo Y570. Spec below. http://www.notebookreview.com/notebookreview/lenovo-ideapad-y570-review-a-lenovo-bestseller/3/ Can anyone suggest a next step in diagnosing and fixing this problem? Thanks in advance.

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  • Execute local script requiring arguments on Linux via plink

    - by c_maker
    Is it possible to execute (from windows) a local script with arguments on a remote linux system? Here's what I got: plink 1.2.3.4 -l root -pw mypassword -m hello.sh Is there a way to do this same thing, but able to give input parameters to hello.sh? I've tried many things, including: plink 1.2.3.4 -l root -pw mypassword -m hello.sh input1 input2 In this case it seems that plink thinks that input1 and input2 are its arguments.. which makes sense. What are my options?

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  • Problems with Windows XP Plug and Play devices, maybe relating to MSVCR71.dll

    - by Richard
    I believe this question is unanswered as of now so I appologize if I've overlooked it. I have been having trouble some external devices with windows recently and I'm trying my darnedest to get to the bottom of it. At first, my Zero Tension USB mouse would stop working...as in the laser in the bottom of it would be on and would register movement, but the mouse on the screen wouldn't budge even an inch. At first this would happen randomly and then it would correct itself. As time went on, it became more and more frequent. At some point, the computer would make the "doo doo" sound of plugging or unplugging a USB device when the mouse stopped/started working. I dealt with it for a while and usually if I rebooted my machine, the mouse would work again for a day or two. As more time has gone on, the computer fully does not recognize the mouse AT ALL...I have another mouse that I use with the computer that works just fine and cannot seem to figure out why my Zero Tension mouse has failed. I tried plugging the Zero Tension mouse into my Mac and low and behold, it works without hesitation and never stops on me... Needless to say, I am stumped about this. I figured because I had another mouse I could deal with the loss of my fancy one for now...until my speakers stopped being recognized. I have a set of Logitec speakers that I have plugged into my sound card. Again, every now and again the audio devices would cease to be recognized by my computer, but a reboot would fix the problem. Now my speakers do not work at all with my computer and I feel like it's time to ask for help. My computer seems to be having a neural shutdown...where I can plug in devices and the computer doesn't seem to notice anything wrong, but none of the devices work. I hope this doesn't get any worse! Please help! Also, on a potentially (un)related note, when I start up my machine I get the message "This application has failed to start because Msvcp71.dll was not found. Re-installing the application may fix this problem." in reference to qbupdate.exe I don't know if that DLL being messed up has anything to do with my mouse or speakers, but I figure it might...anyway, thanks in advance for an answer and let me know if I need to clarify anything. Let me sum up: Zero Tension Mouse gradually stopped working Logitec Speakers gradually stopped working MSVCR71.dll seems to be messed up I don't know if any of those are related but any help would be much appreciated

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  • Date header returned by IIS7 is wrong

    - by James Hollingworth
    I am serving an ASP.NET application from IIS 7 but we are experiencing some weird cookie issues. The code works fine in other environments so we are assuming this is specific to this server (related question). We have been looking at the http headers returned and someone pointed out that the date http header is showing the 1st of Jan rather than today's date (so far it always shows that date regardless of what the current date is). The system clock is set correctly (and we can print out the current time/date via DateTime.Now correctly as well) so we can't work out why it's now working. Does anyone have any ideas? Is this a red-herring? Thanks, James

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  • how to delete protected files in ntfs?

    - by Balchev
    Hello, I want to delete old windows directory from my system drive (C) , but I am unable to due NTFS perms.I tried from Win 7 and Win 2003, but can't do it. I tried safe mode as well with same result. I there any way to work around this (other then formating the drive)? Perhaps changing the owner or something? It errors at files like "oldwin/bfsvc.exe". Is there some "superuser" in windows similar to linux root account? Thanks

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  • How to configure nagios realtime SMS alert

    - by Jerry
    I have configured nagios SMS alert and it takes around one minute to send notification. I want to get SMS notification withing one/two second(s) after system/service failure. I could not find any way to send sms alert in a second. Can anybody help me??? Update Wednesday, 29 August 9:26:43 a.m GMT define host{ use generic-host ; Name of host template to use host_name localhost alias localhost address x.x.x.187 check_command check-host-alive normal_check_interval 1 max_check_attempts 1 retry_interval 1 notification_interval 120 notification_period 24x7 notification_options d,r contact_groups admins }

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  • How to search with Spotlight more effectively

    - by Chris Adams
    I'm used to using various flags to modify the results of Google searches, to only show results from a particular site, or only certain kinds of files. For example you can restrict Spotlight searches to only look for pdf files like this example, when I'm looking for a pdf cheatsheet for using YUI's grid system css framework on my computer. YUI grid kind:pdf I'd be amazed if Apple's Spotlight didn't have loads of other handy flags to fine tune a search in the same way - what tricks do you use, or where do you look to find more tips to improve your Spotlight-fu?

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  • Virtual Machine files on ramdisk doesn't run faster than on physical disk

    - by Landy
    I installed total 36G memory (4x8G + 2x2G) in the host (Windows 7) and I used ImDisk to create a 32G ramdisk and format it to NTFS file system. Then I copied the virtual machine (in VMware Workstation format) folder, including vmx, vmdk, etc... to the new created ram disk. Then I tried to power on it in VMware Workstation. What made me surprised is that the performance is not better than before. It cost almost the same time to power on the Windows 7 VM. I check the Resource Monitor in the Windows 7 host, and the statistics of CPU, disk, network are rather normal. The memory has reported 3000+ hard fault/sec when guest OS boot then drop to 0 after the guest powered on. Any idea about this issue? I had thought the performance of ramdisk will be better than physical disk in this case. Am I wrong? Thanks.

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  • Is a ext3 Linux filesystem byte order independent

    - by Lothar
    I have a good old HP-C3700 Workstation with PA-RISC CPU here that I would like to use as a subversion server for a very large repository. I just worry what happens if the workstation dies (everybody who knows this computer knows that it is running like an Abrams tank and unlikely to happen in the next decade). I'm using Debian Linux on this system. If the mainboard dies can I just plug the SCSI drive into a PC and read the files from a normal Intel Linux PC? Which software RAID levels would be safe?

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  • Robocopy hiding folders on backup drives

    - by Neil Barnwell
    I have a backup batch file that uses Robocopy to backup my files: robocopy "C:\" "G:\Default\RoboCopyBackup\C" /XF Pagefile.sys /XD "System Volume Information" "Recycler" "Temporary Internet Files" "Installer Cache" "Temp" /E /R:1 /W:0 /TEE /XJ This should create a folder structure on the external backup drive like so: G:\Default\RoboCopyBackup\C\... However, G: appears totally empty. What is weird, is that the folders and files are there! If I type the above path into the address bar, I see all the files and folders! Can anyone help me work out why? I think it might be some NTFS-based ownership/permissions thing but I'm not sure.

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  • Need to upgrade DDR2 RAM on HP Desktop

    - by jds
    I have this HP Pavilion Desktop. As you can see, that page says the memory speed supported is PC2-4200. It currently has a 512 MB stick - CPU-Z Screenshots: hxxp://i41.tinypic.com/j5clj6.jpg and hxxp://i39.tinypic.com/20tldlc.jpg However, a crucial.com scan gives a slightly different report - hxxp://crucial.com/systemscanner/viewscanbyid.aspx?id=5718CFE831D926C3 It says the system can support PC2-5300 memory. So my question is which one should I trust? I want to upgrade the computer's ram to 2 GB (the maximum supported), because XP Media Center is giving me problems and I will install Windows 7 on this. PC2-6400 is the most common DDR2 memory I have been able to find here in the market. Will it cause any problems if I install 2 × 1 GB PC2-6400 DDR2 memory sticks (in dual channel) in this computer, (afaik, it will just run at the lower speed of 533 MHz, or whatever the motherboard supports), or do I absolutely need to get PC2-4200 sticks?

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  • kill SIGABRT does not generate core file from daemon started from crontab.

    - by Guma
    I am running CentOS 5.5 and working on server application that sometimes I need to force core dump so I can see what is going on. If I start my server from shell and send kill SIGABRT, a core file is created. If I start same program from crontab and then I send the same signal to it the server is "killed" but no core file is generated. Does any one know why is that and what need to be added to my code or changed in system settings to allow core file generation? Just a side note I have ulimit set to unlimited in /etc/profile I have set kernel.core_uses_pid = 1 kernel.core_pattern=/var/cores/%h-%e-%p.core in /etc/sysctl.conf Also my server app was added to crontab under same login id as I am running it from shell. Any help greatly appreciated

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  • Undeliverable messages to newly migrated Exchange user

    - by johnnyb10
    We are in the process of migrating from our old domain to a new one, part of which involves migrating mailboxes from Exchange 2003 to Exchange 2007. A bunch of users have been migrated already without problems. However, one of the users is having trouble receiving emails from others. When someone sends to him, they get an Undeliverable NDR that says "A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients." The message shows the user's distinguished name as /OU=OurDomain/CN=Recipients/CN=USER57137172. The user's account name should just be "USER", so I don't know where the extra numbers ("57137172") are coming from. Thanks in advance.

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  • BSOD > Help interpret this crash? [DMP file]

    - by feed_me_code
    System just crashed, below here is event view details.. Been running GREAT for last few days.. First crash since.. DMP File link below.. Can someone please help interpret this crash? Thanks The computer has rebooted from a bugcheck. The bugcheck was: 0x000000d1 (0x00001000000102fd, 0x0000000000000002, 0x0000000000000000, 0xfffff88010143afd). A dump was saved in: C:\Windows\Minidump\052714-23010-01.dmp. Report Id: 052714-23010-01. https://www.dropbox.com/s/ag19ejkrddnjjct/052714-23010-01.dmp

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  • Windows 8 Unable to perform hibernate

    - by Jones
    Windows 8 Enterprise edition x86. Already enabled hibernate option, to have it on shutdown menu (start menu?) and set to hibernate on lid closing. However it's not hibernating for me. When I'm trying to sleep, it's sleep fine and wake up like a kid. But when I'm demanding hibernate, it disconnects internet, turn off screen and be back to lock screen in one second. Steps I've tried. Complete shutdown Clear hiberfile.sys by disabling and enabling back Resetting my power settings. Causes I suspect: Had dual boot with BackTrack with Windows 8 GUI boot manager. It was fine until I reinstall BackTrack, bootmgr resetted and I'm in Ubuntu boot menu;. Using additional hard disk through USB cable.(But it's not a problem before few days, however) How to make my system to hibernate and wakeup again.

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  • How to Setting up Amazon EC2 with own OS and DB ?

    - by Spencer Lim
    i got my own version of OS and DB which are window server 2008 Hyper-V R2 and Sql server R2 2008 both in enterprise version may i know how to configure it up and running ? with amazon EC2, what other is a must combination to make it run ? also how could i install the operating system and DNS ? i never doing server before, but i just need something like VPS to support my development and testing. Amazon Ec2 seem the best and cheapest service due to only $1 per hour. Appreciate if Any brief guide provided, Thx =D

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