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  • Calculating IOPS for a single HDD - what am I doing wrong?

    - by red888
    So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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  • Why doesn't my form post when I disable the submit button to prevent double clicking?

    - by John MacIntyre
    Like every other web developer on the planet, I have an issue with users double clicking the submit button on my forms. My understanding is that the conventional way to handle this issue, is to disable the button immediately after the first click, however when I do this, it doesn't post. I did do some research on this, god knows there's enough information, but other questions like Disable button on form submission, disabling the button appears to work. The original poster of Disable button after submit appears to have had the same problem as me, but there is no mention on how/if he resolved it. Here's some code on how to repeat it (tested in IE8 Beta2, but had same problem in IE7) My aspx code <%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <script language="javascript" type="text/javascript"> function btn_onClick() { var chk = document.getElementById("chk"); if(chk.checked) { var btn = document.getElementById("btn"); btn.disabled = true; } } </script> <body> <form id="form1" runat="server"> <asp:Literal ID="lit" Text="--:--:--" runat="server" /> <br /> <asp:Button ID="btn" Text="Submit" runat="server" /> <br /> <input type="checkbox" id="chk" />Disable button on first click </form> </body> </html> My cs code using System; public partial class _Default : System.Web.UI.Page { protected override void OnInit(EventArgs e) { base.OnInit(e); btn.Click += new EventHandler(btn_Click); btn.OnClientClick = "btn_onClick();"; } void btn_Click(object sender, EventArgs e) { lit.Text = DateTime.Now.ToString("HH:mm:ss"); } } Notice that when you click the button, a postback occurs, and the time is updated. But when you check the check box, the next time you click the button, the button is disabled (as expected), but never does the postback. WHAT THE HECK AM I MISSING HERE??? Thanks in advance.

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  • ASP.NET MVC IIS 7.5

    - by alinpopescu
    Hello, I have follwing erorr after I have published site in IIS 7.5 and i don't hnow what to do Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: Could not load type 'ProiectLicenta.MvcApplication'. Source Error: Line 1: <%@ Application Codebehind="Global.asax.cs" Inherits="ProiectLicenta.MvcApplication" Language="C#" %

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  • pure as3 benefits to compiling with flex4 instead of flex3?

    - by jedierikb
    If I have a pure as3 project that I have been compiling with flex3 from mxmlc, is there any reason to switch to using the mxmlc with flex4? I can use all of the flash 10 language features like Vector, 3D, etc., so that is not a reason to switch (or is there something I can't do?). But maybe there is a performance boost? Or is the exact same compiling tool and the flex code base is the only difference?

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  • Solaris disk I/O spike... which monitoring tools do I need?

    - by bonez05
    Hi all, My Solaris 10 websever / database server disk io keeps spiking at intermittent times. Using iostat -xtc 5 the reads / sec will jump from 3.0 to 1450.0 and %busy will jump to 98% The apache access log doesn't indicate anything out of the ordinary. In other words, requests aren't any higher than usual. top doesn't generate anything useful. The cpu usage is fine with mysql using about 20% and nothing else to speak of really. What monitoring tool should I be using to see what process is using excessive disk I/O? or if there are any other suggestions I'm all ears. Thanks

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  • Can't install Nuget or other extension to VS2012 on Win8

    - by VinnyG
    When I try to install any extension for visual studio ultimate 2012 on my new installation of Winodws 8 I get this exception : System.IO.FileNotFoundException: The system cannot find the file specified. (Exception from HRESULT: 0x80070002) at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at Microsoft.VisualStudio.Settings.ExternalSettingsManager.GetScopePaths(String applicationPath, String suffixOrName, String vsVersion, Boolean isLogged, Boolean isForIsolatedApplication) at Microsoft.VisualStudio.Settings.ExternalSettingsManager.CreateForApplication(String applicationPath) at VSIXInstaller.App.GetExtensionManager(SupportedVSSKU sku) at VSIXInstaller.App.GetExtensionManagerForApplicableSKU(SupportedVSSKU supportedSKU, IInstallableExtension installableExtension, List`1 applicableSKUs) at VSIXInstaller.App.InitializeInstall() at System.Threading.Tasks.Task.InnerInvoke() at System.Threading.Tasks.Task.Execute() I tryed to repair VS, did not work, and also try to uninstall/install and got the same problem. Anybody as an idea?

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  • (resolved) empty response body in ajax (or 206 Partial Content)

    - by Nikita Rybak
    Hi guys, I'm feeling completely stupid because I've spent two hours solving task which should be very simple and which I solved many times before. But now I'm not even sure in which direction to dig. I fail to fetch static content using ajax from local servers (Apache and Mongrel). I get responses 200 and 206 (depending on the server), empty response text (although Content-Length header is always correct), firebug shows request in red. Javascript is very generic, I'm getting same results even here: http://www.w3schools.com/ajax/tryit.asp?filename=tryajax_first (just change document location to 'http://localhost:3000/whatever') So, it's probably not the cause. Well, now I'm out of ideas. I can also post http headers, if it'll help. Thanks! Response Headers Connection close Date Sat, 01 May 2010 21:05:23 GMT Last-Modified Sun, 18 Apr 2010 19:33:26 GMT Content-Type text/html Content-Length 7466 Request Headers Host localhost:3000 User-Agent Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 115 Connection keep-alive Referer http://www.w3schools.com/ajax/tryit_view.asp Origin http://www.w3schools.com Response Headers Date Sat, 01 May 2010 21:54:59 GMT Server Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l DAV/2 mod_jk/1.2.28 Etag "3d5cbdb-fb4-4819c460d4a40" Accept-Ranges bytes Content-Length 4020 Cache-Control max-age=7200, public, proxy-revalidate Expires Sat, 01 May 2010 23:54:59 GMT Content-Range bytes 0-4019/4020 Keep-Alive timeout=5, max=100 Connection Keep-Alive Content-Type application/javascript Request Headers Host localhost User-Agent Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 115 Connection keep-alive Origin null UPDATED: I've found a problem, it was about cross-domain requests. I knew that there are restrictions, but thought they're relaxed for local filesystem and local servers. (and expected more descriptive error message, anyway) Thanks everybody!

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  • a good smart phone for java development?

    - by pstanton
    Hi all, I'd like to do some development of smart phone apps and my native programming language is java. The first application I'd like to write will need to be able to (attempt to) connect to a network (LAN or WiFi) automatically in the background (on a schedule). would an android phone be the best path or are there competitive purer java options?

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  • Is Prince the best way to PDF in Ruby on Rails?

    - by Angela
    After several Google searches, it appears that the way to create PDF's in Rails from HTML and CSS (versus a new markup language) is to use Prince. With licensing at $3800 for my non-big-commercial app, I'm wondering if this is, in fact, consensus or people have an alternative they can share the what's and how's.

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  • How can I match string order between two documents in PERL?

    - by Randy
    Hi, I've a problem in making a PERL program for matching the words in two documents. Let's say there are documents A and B So I want to delete the words in document A that's not in the document B A: I eat pizza B: She go to the market and eat pizza result: eat pizza I use Perl for the system and the sentences in each document isn't in a big numbers so I think I won't use SQL And the program is a subproram for automatic essay grading for Indonesian Language (Bahasa) Thanx, Sorry if my question is a bit confusing. I'm really new to 'this world' :)

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  • Solution for storing sata drives outside of case

    - by Jeffrey Kevin Pry
    I have a system that has 8 sata disks in a software raid 5 array using mdadm. My issue is that I want to move the drives from inside of the computer case in order to cool more efficiently. I have looked all over the web and only seem to find enclosures that hide the drives connectors behind an estata port or some other internal raid controller. Basically what I want is an enclosure or equivalent that I can run independent sata cables to and either power as well, or have it have its own power supply. I have the sata ports on the motherboard available and don't want to limit io by using one port with a multiplier or the like. One final caveat, I am a college student on a budget and don't have a fortune to spend on such an enclosure. Thanks in advance for your help and advice.

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  • Parsing a string

    - by sfactor
    i have a string of the format SUCCESS,12:34:56:78:90, i want to separate these two values that are separated by commas into two different strings. how do i do that in gcc using c language.

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  • parallel java libraries

    - by jetru
    I'm looking for Java libraries/applications which are parallel and feature objects that can be queried in parallel. That is, there is/are objects in which multiple types of operations can be made from different threads and these will be synchronized. It would be helpful if someone could ideas of where I could find such applications as well. EDIT: Actually, language doesn't matter so much, so C++, Python, anything is welcome

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  • Parse Formulae in C#

    - by Cool
    Hello All, I am trying to parse formula in C# language like "5*3 + 2" "(3*4 - 2)/5" Is it possible to do in C# or scripts like VBScript, JavaScript (which will be called in c# program). Thanks a lot!.

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  • Does Scheme work with Microsoft COM?

    - by Martin
    I'm new to Scheme -- the functional programming language and I like it a lot for its first-class/higher-order functions. However, my data comes from a COM source with an object-oriented API. I know Scheme and COM belong to different programming paradigms, but I'm wondering if there is any interface or a way for Scheme to connect to a COM source? Thanks.

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  • Are you a self taught programmer or did you take a programming course?

    - by workinprogress
    Lots of developers I know were self taught programmers including me. I was wondering how much of the developer community learned programming by taking a course in school or by experimenting, asking questions on forums, reading online articles, and just making it up as you go along? Post whether you were self taught or took classes, what language you program in, and anything else that may be interesting. P.S. Books count as self taught.

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  • python programme.

    - by siva
    hi, i am siva this is frist time taken the python programming language i have a small problem please help me the question is **Write two functions, called countSubStringMatch and countSubStringMatchRecursive that take two arguments, a key string and a target string. These functions iteratively and recursively count the number of instances of the key in the target string. You should complete definitions for def countSubStringMatch(target,key): and def countSubStringMatchRecursive (target, key): **

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  • Expression Too Complex In Access 2007

    - by Jazzepi
    When I try to run this query in Access through the ODBC interface into a MySQL database I get an "Expression too complex in query expression" error. The essential thing I'm trying to do is translate abbreviated names of languages into their full body English counterparts. I was curious if there was some way to "trick" access into thinking the expression is smaller with sub queries, or if someone else had a better idea of how to solve this problem. I thought about making a temporary table and doing a join on it, but that's not supported in Access SQL. Just as an FYI, the query worked fine until I added the big long IFF chain. I tested the query on a smaller IFF chain for three languages, and that wasn't an issue, so the problem definitely stems from the huge IFF chain (It's 26 deep). Also, I might be able to drop some of the options (like combining the different forms of Chinese or Portuguese) As a test, I was able to get the SQL query to work after paring it down to 14 IFF() statements, but that's a far cry from the 26 languages I'd like to represent. SELECT TOP 5 Count( * ) AS [Number of visits by language], IIf(login.lang="ar","Arabic",IIf(login.lang="bg","Bulgarian",IIf(login.lang="zh_CN","Chinese (Simplified Han)",IIf(login.lang="zh_TW","Chinese (Traditional Han)",IIf(login.lang="cs","Czech",IIf(login.lang="da","Danish",IIf(login.lang="de","German",IIf(login.lang="en_US","United States English",IIf(login.lang="en_GB","British English",IIf(login.lang="es","Spanish",IIf(login.lang="fr","French",IIf(login.lang="el","Greek",IIf(login.lang="it","Italian",IIf(login.lang="ko","Korean",IIf(login.lang="hu","Hungarian",IIf(login.lang="nl","Dutch",IIf(login.lang="pl","Polish",IIf(login.lang="pt_PT","European Portuguese",IIf(login.lang="pt_BR","Brazilian Portuguese",IIf(login.lang="ru","Russian",IIf(login.lang="sk","Slovak",IIf(login.lang="sl","Slovenian","IIf(login.lang="fi","Finnish",IIf(login.lang="sv","Swedish",IIf(login.lang="tr","Turkish","Unknown")))))))))))))))))))))))))) AS [Language] FROM login, reservations, reservation_users, schedules WHERE (reservations.start_date Between DATEDIFF('s','1970-01-01 00:00:00',[Starting Date in the Following Format YYYY/MM/DD]) And DATEDIFF('s','1970-01-01 00:00:00',[Ending Date in the Following Format YYYY/MM/DD])) And reservations.is_blackout=0 And reservation_users.memberid=login.memberid And reservation_users.resid=reservations.resid And reservation_users.invited=0 And reservations.scheduleid=schedules.scheduleid And scheduletitle=[Schedule Title] GROUP BY login.lang ORDER BY Count( * ) DESC; @ Michael Todd I completely agree. The list of languages should have been a table in the database and the login.lang should have been a FK into that table. Unfortunately this isn't how the database was written, and it's not really mine to modify. The languages are placed into the login.lang field by the PHP running on top of the database.

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  • starting with android

    - by Woland
    I am considering to start writing apps for android. Could some-one post list with all tools needed to start coding. My programming skills by language are C# - excellent Java - moderate c/c++ - beginner I have heard something about Mono for android, whats the status of it? is it any good? Also it would be helpful to hear how Java performs on android. Any other points and issues regarding the android platform are also welcomed.

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  • Why would I want to use server-side JavaScript?

    - by Joseph Silvashy
    I'm confused, I regularly read talk of server-side JS, why would I want to use that? It seems like it would execute way slower than pretty much any other language, it also lacks many conventions that more sophisticated languages have. Is it possible to hand entire objects from the client to the server, manipulate them and return them back? Just struggling to understand the concepts of it.

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  • Decompile an SWF

    - by Belgin Fish
    Hi What language would I need to use to decompile an swf file automatically on my server, not like a desktop app. A bit like http://www.showmycode.com/ And could anyone point me in the right direction to get started?

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  • What are the reasons to select Object Oriented Programming over Procedural Programming?

    - by Starx
    Nowadays, Standard Coding has become Synonymous to Object Oriented Programming. But what are the reasons that forced classical procedural programming out of the way and rose the new concept of Object Oriented Programming. What were the limitations that Procedural Programming could not accomplish? and Does procedural language still hold some value in the field of programming? If yes, What are they, and What are there advantages over OOP?

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