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  • IIS/ASP.NET performance incident - Perfmon Current Annonymous Users going through roof but Requests/sec low

    - by Laurence
    Setup: ASP.NET 4.0 website on IIS 6.0 on Win 2003 64 bit, 8xCPUs, 16GB memory, separate SQL 2005 DB server. Had a serious slowdown today with any otherwise fairly well performing ASP.NET site. For a period of a couple of hours all page requests were taking a very long time to be served - e.g. 30-60s compared to usual 2s. The w3wp.exe's CPU and memory usage on the webserver was not much higher than normal. The application pool was not in the middle of recycling (and it hadn't recycled for several hours). Bottlenecks in the database were ruled out - no blocks occurring and query results were being returned quickly. I couldn't make any sense of it and set up the following Perfmon counters: Current Anonymous Users (for site in question) Get requests/sec (ditto) Requests/sec for the ASP.NET application running the site Get requests/sec was averaging 100-150. Requests/sec for ASP.NET was averaging 5-10. However Current Anonymous Users was around 200. And then as I was watching, the Current Anonymous Users began to climb steeply going up to about 500 within a few minutes. All this time Get requests/sec & Requests/sec for ASP.NET was if anything going down. I did a whole load of things (in a panic!) to try to get the site working, like shutting it down, recycling the app pool, and adding another worker process to the pool. I also extended the expiration time for content (in IIS under HTTP Headers) in an attempt to lower the number of requests for static files (there are a lot of images on the site). The site is now back to normal, and the counters are fairly steady and reading (added Current Connections counter): Current Anonymous Users : average 30 Get requests/sec : average 100 Requests/sec for ASP.NET : 5 Current Connections : average 300 I have also observed an inverse relationship between Get requests/sec & Current Anonymous Users. Usually both are fairly steady but there will be short periods when Get requests/sec will go down dramatically and Current Anonymous Users will go up in a perfect mirror image. Then they will flip back to their usual levels. So, my questions are: Thinking of the original performance issue - if w3wp.exe CPU, memory usage were normal and there was no DB bottleneck, what could explain page requests taking 20 times longer to be served than usual? What other counters should I be looking at if this happens again? What explains the inverse relationship between Get requests/sec & Current Anonymous Users? What could explain Current Anonymous Users going from 200 to 500 within a few minutes? Many thanks for any insight into this.

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  • Mobile security solutions

    - by techzen
    What are the mobile security solutions used by you / your organization. What are the pro's and cons of usage of these solution - and how far have you been successful in implementing these - were there any loopholes / issues faced in using them?. In general, can you suggest a set of guidelines to watch for when going for going for selecting a specific solution in this context.

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  • 4 Magento Requests per second = 210 mbit memcache bandwith?

    - by Karsten
    After searching serverfault for similar questions without success, these are my numbers for one magento instance, running on multiple servers: After varnish about 4 requests per second hit the webservers The magento cache is configured to use one separate memcache server where I'm measuring about 210 Mbit/s bandwith usage. Compared to other projects, magento and non-magento, this number seems way off (as in extremely high). I'd like to get some data to compare to, or even better, if you have any idea what exactly causes this/how to find it and how to improve the situation.

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  • Terminal server for Linux

    - by Hubert Kario
    What are the features of graphical terminal servers and technologies available for Linux? is it open source/free how well does it scale management (?) what's the network usage, susceptibility to latency support for session pause/resume what client platforms does it support support for sound (playback and record) directory/local disk sharing local printing other cons/pros This question is supposed to be a community wiki for comparison between the different technologies, but it looks like I don't have enough points to make questions into wikis(?)

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  • WINDOWS - Deleting Temporary Internet Files through Group Policy

    - by Muhammad Ali
    I have a domain controller running on Windows 2008 Server R2 and users login to application servers on which Windows 2003 Server SP2 is installed. I have applied a Group Policy to clean temporary internet files on exit i.e to delete all temporary internet files when users close the browser. But the group policy doesn't seem to work as user profile size keeps on increasing and the major space is occupied by temporary internet files therefore increasing the disk usage. How can i enforce automatic deletion of temporary internet files?

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  • how to set multiple white spaces (ex: tabs) as delimiters in bash's `cut`

    - by Idlecool
    I want to retrieve the cpu usage/free percentage from mpstat output. The bash cut can be used to retrieve such details but i dont know what should be the delimiter viz. [idlecool@archbitch proc]$ mpstat | grep "all" | cut -d '$x' -f11 what should be $x so that i can skip white spaces and select value corresponding to %idle? Output of mpstat: [idlecool@archbitch proc]$ mpstat Linux 2.6.36-ARCH (archbitch) 01/14/11 _i686_ (2 CPU) 19:58:53 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 19:58:53 all 5.51 0.01 2.96 0.84 0.00 0.01 0.00 0.00 90.66

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  • Software for managing a gamenet

    - by Isaac
    I need a software for managing gamenet (Gamenet is like a cybercafe except people play games in gamenet instead of surfing the web!) The software should have this basic features: Accounting features (defining users, assigning a usage time to them, etc) Denying access to regular windows features (windows explorer, creating/editing/deleting files) Showing a list of available games to users to run. Creating login report I've tested a software named GamePort but it has some bugs and shortcomings.

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  • Software for managing a gamenet

    - by Isaac
    I need a software for managing gamenet (Gamenet is like a cybercafe except people play games in gamenet instead of surfing the web!) The software should have this basic features: Accounting features (defining users, assigning a usage time to them, etc) Denying access to regular windows features (windows explorer, creating/editing/deleting files) Showing a list of available games to users to run. Creating login report I've tested a software named GamePort but it has some bugs and shortcomings.

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  • Slow ASP.NET site using IIS6

    - by lars
    Hi, I have two servers, one virtual and one physical, running the exact same site on both machines. Both machines are running on ~ 2% CPU load and very much RAM available for usage. Somehow the site, with cache turned off ofcourse, loads in ~ 500ms on the virtual machine (which is a dev-server by the way) but almost 3 full seconds on the physical machine. They're both running Server 2003, IIS6 aswell as asp.net version 2.0 Any ideas where I can start troubleshoot this? Best Regards LP

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  • Linux server very slow after IP change and synflood attack

    - by Johannes Ruof
    our server experienced a synflood attack and we used the csf firewall synflood settings to block it. Our server administrators also changed the IP of the server to a new one and blackholed the old IP. The attack went over and I changed the synflood settings back. However the server is still very slow, with a very low CPU usage and very low traffic on the website. Does anybody have an idea what might be causing this? The server is a CENTOS 6.4 x86_64 Thanks in advance, J. Ruof

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  • Why should I use Amazon Route 53 over my registrar's DNS servers?

    - by Abtin Forouzandeh
    I am building a site that I anticipate will have high usage. Currently, my registrar (GoDaddy) is handling DNS. However, Amazon's Route 53 looks interesting. They promise high speed and offer globally distributed DNS servers and a programmable interface. While GoDaddy doesn't offer a programmable interface, I assume their servers are geographically distributed as well. What are the main reasons I should opt to use Amazon Route 53 over free registrar-based DNS?

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  • 4.5 Load average on single CPU

    - by Webnet
    I'm currently looking at... top - 16:27:37 up 27 min, 1 user, load average: 4.96, 3.75, 2.87 Tasks: 141 total, 6 running, 135 sleeping, 0 stopped, 0 zombie Cpu(s): 91.4%us, 6.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.3%hi, 1.3%si, 0.0%st Mem: 514952k total, 507500k used, 7452k free, 5652k buffers Swap: 1044184k total, 281400k used, 762784k free, 89164k cached This is a single 2.0 Ghz CPU with 2 GB RAM Is it time for an upgrade? I'm watching and it seems to stick around 50% CPU "us" which I assume means usage.

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  • Windows Server 2008 Migration - Did I miss something?

    - by DevNULL
    I'm running in to a few complications in my migration process. My main role has been a Linux / Sun administrator for 15 yrs so Windows server 2008 environment is a bit new to me, but understandable. Here's our situation and reason for migrating... We have a group of developers that develop VERY low-level software in Visual C with some inline assembler. All the workstations were separate from each other which cased consistency problems with development libraries, versions, etc... Our goal was to throw them all on to a Windows domain were we can control workstation installations, hot fixes (which can cause enormous problems), software versions, etc... All Development Workstations are running Windows XP x32 (sp3) and x64 (sp2) I running in to user permission problems and I was wondering maybe I missed one, tWO or a handful of things during my deployment. Here is what I have currently done: Installed and Activated Windows Server 2008 Added Roles for DNS and Active Directory Configured DNS with WINS for netbios name usage Added developers to AD and mapped their shared folders to their profile Added roles for IIS7 and configured the developers SVN Installed MySQL Enterprise Edition for development usage Not having a firm understanding of Group Policy I haven't delved deeply in to that realm yet. Problems I'm encountering: 1. When I configure any XP workstations to logon our domain, once a user uses their new AD login, everything goes well, except they have very restrictive permissions. (Eg: If a user opens any existing file, they don't have write access, except in their documents folder.) Since these guys are working on low system level events, they need to r/w all files. All I'm looking to restrict in software installations. Am I correct to assume that I can use WSUS to maintain the domains hot fixes and updates pushed to the workstations? I need to map a centralized shared development drive upon the users login. This is open to EVERYONE. Right now I have the users folders mapped upon login through their AD profile. But how do I map a share if I've already defined one within their profile in AD? Any responses would be very grateful. Do I have to configure and define a group policy for the domain users? Can I use Volume Mirroring to mirror / sync two drives on two separate servers or should I just script a rsync or MS Synctool? The drives simply store nightly system images.

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  • Rsync: remote source and destination

    - by goncalopp
    If both source and destination are remote, rsync complains: The source and destination cannot both be remote. rsync error: syntax or usage error (code 1) at main.c(1156) [Receiver=3.0.7] Is there a insurmountable technical obstacle to making rsync do this? Or it's simply a case of it's-not-yet-implemented? It seems relatively easy to create a local buffer in memory that mediates the transfer between two remotes, holding both hashes and data. Conversely, is there other (unix) software that implements this functionality?

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  • MySQL 5.1.34 on NFS w/NetApp

    - by shrisha
    Is this still a bad idea? I know older versions of MySQL performed poorly with NFS. I imagine the issue lies with the usage of fsnc() and/or O_DIRECT. If the issues are mostly resolved, are there common pitfalls/gotchas, specifically around a large (multiple tables with tens of millions of records) InnoDB database that may see up to 20-50 reads/sec

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  • Unable to start sql service when TCP/IP is enabled under SSCM - SS Network Configuration

    - by ebel
    I get error 10048. and this in event history: The SQL server service terminated with server-specific error. Only one usage of each socket (protcol/network address/port) is normall permitted. Any idea howto fix this ? Port set is the default 1433... If this is turned off, which is default of course, SQL service starts like a champ. I have done this config many times on other servers with no problem.

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  • How to get more information from the system crash

    - by viraptor
    I'd like to debug an issue I'm having with a linux (debian stable) server, but I'm running out of ideas of how to confirm any diagnosis. Some background: The servers are running DL160 class with hardware raid between two disks. They're running a lot of services, mostly utilising network interface and CPU. There are 8 cpus and 7 "main" most cpu-hungry processes are bound to one core each via cpu affinity. Other random background scripts are not forced anywhere. The filesystem is writing ~1.5k blocks/s the whole time (goes up above 2k/s in peak times). Normal CPU usage for those servers is ~60% on 7 cores and some minimal usage on the last (whatever's running on shells usually). What actually happens is that the "main" services start using 100% CPU at some point, mainly stuck in kernel time. After a couple of seconds, LA goes over 400 and we lose any way to connect to the box (KVM is on it's way, but not there yet). Sometimes we see a kernel reporting hung task (but not always): [118951.272884] INFO: task zsh:15911 blocked for more than 120 seconds. [118951.272955] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [118951.273037] zsh D 0000000000000000 0 15911 1 [118951.273093] ffff8101898c3c48 0000000000000046 0000000000000000 ffffffffa0155e0a [118951.273183] ffff8101a753a080 ffff81021f1c5570 ffff8101a753a308 000000051f0fd740 [118951.273274] 0000000000000246 0000000000000000 00000000ffffffbd 0000000000000001 [118951.273335] Call Trace: [118951.273424] [<ffffffffa0155e0a>] :ext3:__ext3_journal_dirty_metadata+0x1e/0x46 [118951.273510] [<ffffffff804294f6>] schedule_timeout+0x1e/0xad [118951.273563] [<ffffffff8027577c>] __pagevec_free+0x21/0x2e [118951.273613] [<ffffffff80428b0b>] wait_for_common+0xcf/0x13a [118951.273692] [<ffffffff8022c168>] default_wake_function+0x0/0xe .... This would point at raid / disk failure, however sometimes the tasks are hung on kernel's gettsc which would indicate some general weird hardware behaviour. It's also running mysql (almost read-only, 99% cache hit), which seems to spawn a lot more threads during the system problems. During the day it does ~200kq/s (selects) and ~10q/s (writes). The host is never running out of memory or swapping, no oom reports are spotted. We've got many boxes with similar/same hardware and they all seem to behave that way, but I'm not sure which part fails, so it's probably not a good idea to just grab something more powerful and hope the problem goes away. Applications themselves don't really report anything wrong when they're running. I can run anything safely on the same hardware in an isolated environment. What can I do to narrow down the problem? Where else should I look for explanation?

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  • Could I get secure proxy server service free? [closed]

    - by lamwaiman1988
    It comes to my mind that when I use any proxy server, the information will be submit to the proxy server including the username/password of any website I login. This way I risk my identity. I've heard that there are some secure proxy server but can I found any with reasonable price, probably free? ( By the way, VPN is also considered but they are expensive for personal usage ). Even if I can find such service, how can I know that they won't exploit my information?

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  • What are the strengths of OpenSolaris compared to Linux?

    - by netvope
    Please try to answer in these areas: For what kind of usage is OpenSolaris more suited than Linux? What are the useful OpenSolaris features that Linux lacks? Personal experiences are welcomed, but please don't start a flame war. Strengths of Linux over OpenSolaris are beyond this topic. (For Linux, I'm thinking of something like Ubuntu or Fedora, but not RHEL, if that matters.) (I have used Linux servers for a long time but have never used Solaris, if that matters.)

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