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  • Bad IIS 7.5 performance on webserver

    - by Robert P.
    I have a webpage (ASP.NET 4.0 / MVC 4). On my development machine (i5-2500 3.3 8GB Win7 VS2010 SP1 Fujitsu Esprimo P700) the page performs with 160 requests/sec on devenv webserver on my machine. The page performs with 250 requests/sec on my local IIS 7.5. (uncompiled web) The page performs with 20 requests per second on a 16core 32gb ram production server (Fujitsu RX-300 w2k8 rc2 IIS 7.5). (compiled web) Why? I think it's the IIS configuration but i can't figure out whats the problem. The page runs with 1 worker process on both machines. Web garden is not an option (it helps but the app isnt compatible with)

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  • How to prevent bad queries from breaking replication?

    - by nulll
    For my personal experience, mysql replication is fragile. I know that there area many things not to do beacuse they could break replication, but we are humans and the error could always occur. So I was thinking... is there a way to enforce mysql replication? Something that prevents queries that are dangerous for the replication to be runt? In other words I'm searching for something that saves replication even if I accidentally run evil queries.

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  • Nginx Tornado Combination Causing 502 Bad Gateway Errors

    - by PlaidFan
    We are facing a problem with inconsistent 502 errors and tracking down the reasons has been a very frustrating exercise. We can reproduce the problem by sending several simultaneous requests quickly. The problem is that several is only in the range of 10 to 20 within a 5 seconds (not a typo). So clearly this type of load should be handled easily. We really like the Nginx + Tornado approach but are considering going to a more traditional (e.g. threading) approach because this problem has been very difficult to solve. I was wondering if you a) know how to fix this issue and b) how we can tracked down the culprit(s). The log files simply identify there being a connection refused. We have the same problem as this post: How do I debug a HTTP 502 error? But there is no answer provided on how to solve the problem so I'm hoping you can help because this may be a common issue with this type of setup. Thanks in advance, Paul

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  • What is the best way to make a test duplicate of an AD DC?

    - by Puddingfox
    I have a production Active Directory Server running on a Windows Server 2008 R2 machine. I would like to make a duplicate of this machine with all setting the same, except the domain would be a slight variation of the current domain (think winnet to winnet2). Would it be easiest to try to clone the hard drive while the machine is running and change the domain on the clone in a different machine or export the data and import it on a different box?

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  • Expertise Location [closed]

    - by Alexey Shatygin
    Is there some really working implementations of the expertise location systems exist? It is very hard to find anything about it. What sources to use, what to read, where to look? I've started with reading David W. McDonald's, Mark S. Ackerman's overview "Just talk to me" and now need just something more detailed. For those, who voting this question to be closed for off-topic: it is connected to IT sphere, if you don't know what it is - why ever vote? http://en.wikipedia.org/wiki/Expertise_finding http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.40.4654&rep=rep1&type=pdf

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  • What to do before trying to benchmark

    - by user23950
    What are the things that I should do before trying to benchmark my computer: I've got this tools for benchmarking: 3dmark cinebench geekbench juarez dx10 open source mark Do I need to have a full spyware and virus scan before proceeding?What else should I do, in order to get accurate readings.

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  • Security considerations in providing VPN access to non-company issued computers [migrated]

    - by DKNUCKLES
    There have been a few people at my office that have requested the installation of DropBox on their computers to synchronize files so they can work on them at home. I have always been wary about cloud computing, mainly because we are a Canadian company and enjoy the privacy and being outside the reach of the Patriot Act. The policy before I started was that employees with company issued notebooks could be issued a VPN account, and everyone else had to have a remote desktop connection. The theory behind this logic (as I understand it) was that we had the potential to lock down the notebooks whereas the employees home computers were outside of our grasp. We had no ability to ensure they weren't running as administrator all the time / were running AV so they were a higher risk at being infected with malware and could compromise network security. With the increase in people wanting DropBox I'm curious as to whether or not this policy is too restrictive and overly paranoid. Is it generally safe to provide VPN access to an employee without knowing what their computing environment looks like?

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  • How to give write permissions to multiple users?

    - by Daniel Rikowski
    I have a web server and I'm uploading files using an FTP client. Because of that the owner and the group of the file are taken from the user used during the upload. Now I have to make this file writable by the web server (apache/apache). One way would be to just change the owner and the group of the uploaded file to apache/apache, but that way I cannot modify the file using the FTP account. Another way would be to give the file 777 permissions. Both approaches seem not very professional and a little bit risky. Are there any other options? In Windows I can just add another user to the file. Can something similar done with Linux?

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  • Getting a Cross-Section from Two CSV Files

    - by Jonathan Sampson
    I have two CSV files that I am working with. One is massive, with about 200,000 rows. The other is much smaller, having about 12,000 rows. Both fit the same format of names, and email addresses (everything is legit here, no worries). Basically I'm trying to get only a subset of the second list by removing all values that presently exist in the larger file. So, List A has ~200k rows, and List B has ~12k. These lists overlap a bit, and I'd like to remove all entries from List B if they also exist in List A, leaving me with new and unique values only in List B. I've got a few tooks at my disposal that I can use. Open Office is loaded on this machine, along with MySQL (queries are alright). What's the easiest way to create a third CSV with the intersection of data?

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  • How to force a remap of sectors reported in S.M.A.R.T C5 (Current Pending Sector Count)?

    - by edgh
    The S.M.A.R.T C5 value of my Samsung HM640JJ Hard Drive (in an HP Pavilion dv6 laptop) is "yellow status = caution" C5 was 10 yesterday, and it's 21 today. C4 (Reallocation Event Count) = 0 and 05 (Reallocated Sectors Count) = 0 How can I force the firmware to reallocate them? I removed the partitions, recreated them again and formatted the entire drive. I ran chkdsk /r /f I ran the BIOS disk check utility and other diagnose/repair tools

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  • RAIDs with a lot of spindles - how to safely put to use the "wasted" space

    - by kubanczyk
    I have a fairly large number of RAID arrays (server controllers as well as midrange SAN storage) that all suffer from the same problem: barely enough spindles to keep the peak I/O performance, and tons of unused disk space. I guess it's a universal issue since vendors offer the smallest drives of 300 GB capacity but the random I/O performance hasn't really grown much since the time when the smallest drives were 36 GB. One example is a database that has 300 GB and needs random performance of 3200 IOPS, so it gets 16 disks (4800 GB minus 300 GB and we have 4.5 TB wasted space). Another common example are redo logs for a OLTP database that is sensitive in terms of response time. The redo logs get their own 300 GB mirror, but take 30 GB: 270 GB wasted. What I would like to see is a systematic approach for both Linux and Windows environment. How to set up the space so sysadmin team would be reminded about the risk of hindering the performance of the main db/app? Or, even better, to be protected from that risk? The typical situation that comes to my mind is "oh, I have this very large zip file, where do I uncompress it? Umm let's see the df -h and we figure something out in no time..." I don't put emphasis on strictness of the security (sysadmins are trusted to act in good faith), but on overall simplicity of the approach. For Linux, it would be great to have a filesystem customized to cap I/O rate to a very low level - is this possible?

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  • File corruption (bad checksums) in large files copied to VMware guest

    - by AllanA
    In setting up a development lab, I've got a desktop system running ESXi 4.1.0 (free license) on SATA RAID 0 (already purchased and configured when I started this job; I'm open to hardware input as it pertains to my problem.) Its guests so far include two Win2008 Server R2 64-bit VMs and on Ubuntu 10.04 64-bit VM. I'm installing onto the Windows servers. We've been copying off some fairly large files (over a gigabyte) for an installation, hoping to install more quickly from a (virtual) hard drive than from the network for from BD-ROM. The problem is that they keep coming up with different checksums from the originals. The file sizes are the same, but md5sum reports different numbers (and so does the installer, as it refuses to continue when the checksums don't match.) I've tried copying directly from the BD-ROM (attaching the OS drive to the host system's physical drive). I've tried copying the large files onto a co-worker's Windows machine from his Blu-Ray drive; when I do that, the checksums match. But when I copy from his machine to the VM guest over a network share, the checksums no longer match. Thinking this meant a corrupt destination drive, I deleted it in vSphere and added another freshly created drive. The problem persists. I'm not sure what to try next.

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  • Securing internal data accessed by a website on the big, bad internet

    - by aehiilrs
    A close relative of this question on Stack Overflow: When you have a web site in your DMZ that needs to access production data stored on an internal DB, what strategies do you recommend using to lower the risks that come from accessing live data? Is it even considered acceptable to have a connection initiated from the DMZ come inside of your network? An extra detail about the nature of the site that kind of throws a monkey wrench into the machinery is that people using the web site will be competing for "spots" on a first-come, first-serve basis with others using the internal software. Because of this, as close to zero lag time between the two applications as possible is ideal.

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  • gzip compression good or bad?

    - by WarDoGG
    I have a server that currently does a lot of processing in my application and the target users are those who have a very good internet connection. The output that is sent from the server is always text/html and we do not use any media (audio/video) only images (static site images like logo,etc). We are experiencing severe performance issues and I wonder if turning off gzip/mod_deflate on the server so that the server would avoid compressing the output. Will this cause an improvement in performance?

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  • Installed Ubuntu 11.10, getting hard disk health warnings

    - by Brad
    I'm getting hard disk health problem warnings... When I click the "examine" button the disk utility pops up. None of my drives are reporting any major issues, and the very first drive doesn't even have a SMART button. I don't really care if one of the drives is crashing, I've got everything backed up, but I just want to know how to stop these god forsaken message boxes from popping up randomly. I have already gone into the Disk Utility and checked "do not notify me if this drive is failing" on all of them except the one that doesn't have the SMART button. I've googled about as much as I can for one day.

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  • What UDP port number(s) is/are most likely to be unblocked at a client? [closed]

    - by mike
    For a custom UDP server servicing a wide variety of client machines sending custom UDP packets, what's the best port to choose as the standard listening port for the server (in that the port is not likely to be disabled at the client by a firewall or router)? My first inclination is to use port 80, since almost everyone is using HTTP, but that's TCP, and maybe blocking of UDP on port 80 has become common. What's the best port to choose?

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  • Bad utf8 display with tmux

    - by Nison Maël
    When I press the "é" key multiple times on my keyboard, here is what tmux print (notice the spaces) : arcanis@~ > é é é é é é é é é é é é é It also broke emacs when the file contains utf8 characters. My locale is : arcanis@~ > locale LANG=en_US.UTF-8 LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= How can I fix this ?

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  • What command line tools for monitoring host network activity on linux do you use?

    - by user27388
    What command line tools are good for reliably monitoring network activity? I have used ifconfig, but an office colleague said that its statistics are not always reliable. Is that true? I have recently used ethtool, but is it reliable? What about just looking at /proc/net 'files'? Is that any better? EDIT I'm interested in packets Tx/Rx, bytes Tx/Rx, but most importantly drops or errors and why the drop/error might have occurred.

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