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• What are the Windows G: through Z: drives used for?

  - by Tom Wijsman

  In Windows you have a C: drive. The first things labeled beyond that seems to be extra stuff. So my DVD drive is D: and if you put in a USB stick it becomes F:. And then some people also have A: and B:. But then, what and where are G: through Z: drives for? Is it possible to connect so many things to a computer to make them all in use? Or more than them? Would it give a BSOD? Or would this slow down the system somehow? Or what would happen? What if I want to connect even more drives to the computer? Because with the hard drive limits it's more efficient to buy more drives than to buy a single drive with a lot of capacity. Is it possible to create drive letters like 0: through Z: or AA: through ZZ:?

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• solaris + EMC + power-path

  - by yael

  please advice - when I run powercf command on my Solaris machine , which changes this command do on the EMC storage , or on Solaris file system ? from maanual page: DESCRIPTION During system boot on Solaris hosts, the powercf utility configures PowerPath devices by scanning the HBAs for both single-ported and multiported storage system logical dev- ices. (A multiported logical device shows up on two or more HBAs with the same storage system subsystem/device identity. The identity comes from the serial number for the logical device.) For each storage system logical device found in the scan of the HBAs, powercf creates a corresponding emcpower device entry in the emcp.conf file, and it saves a primary path and an alternate primary path to that device.

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• Is it effective installing firewall within same machine which offering service?

  - by Eonil

  I'm a starting a small service practically. And I have single server currently. No money to purchase separated/dedicated firewall equipment now. Is it effective installing firewall software on same machine which offering internet service? My server will offer HTTP, NFS, and SSH, and custom made server software on a several ports. (edit) All services (except NFS) should be open to internet. Not internal services. I guess my machine (virtualized within Xen) is connected to the internet directly because I can connect to my machine SSH with only IP address. (edit) NFS is not open to internet. Sorry for my mistake. NFS will be served via SSH only.

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• What hardware factors may be considered bottlenecks on a Hyper-V virtual server during load testing?

  - by sean

  Our organization is load testing our application using virtual servers via Hyper-V to see what the user load can be using fair equipment on a single box setup. The developer group questioned the validity of the tests given the normal use of the box by the other virtual machines. IT admins answered that it is an acceptable platform to load test on because it has its own CPUs, memory and disks allocated. Is their answer mostly correct? What hardware factors may be considered bottle necks given the other virtual machines when testing our application? For example, would bus speed be a concern or network IO? The application consists of a windows service written using the 4.0 .NET Framework and SQL Server 2008 R2.

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• Lustre - is this bad form?

  - by ethrbunny

  Im going to be consolidating several 'server rooms' into a single installation soon. Part of this effort will be finding a home for 5Tb (and growing) of files / logs. To this end Im looking at Lustre and appreciating its ability to scale. The big vendors want to sell me a $20K SAN to manage this but Im wondering about buying several iSCSI units (like this http://www.asacomputers.com/3U-iSCSI-Solution.html) and using VMs for the OSS machines. This would let me fail-over to cover problems and not require a dedicated system for each OSS. Given articles like this (http://h30565.www3.hp.com/t5/Feature-Articles/RAID-Is-Dead-Long-Live-RAID/ba-p/1422) that talk about how RAID is not keeping up with drive density Im leaning towards more disks with lower capacity each. Again - some akin to the iSCSI array above. Tell me why this is a terrible idea. Do I really need to invest in a PE710 for each OSS/OST?

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• Why are my downloads up to ~1500KByte/sec only, when the ADSL connection locks at 13611Kbit/s?

  - by leladax

  No uploading is going on other than the overhead of downloading which appears to be not high for the abilities of the connection: Only about 30-40KByte/s when the router locks at 1012Kb/s and other direct uploads or uploading overheads can reach more than 100KByte/sec so I don't think it's a congestion at uploading that is doing it. Is there something I miss? Because I assume 13611Kbit/s should be ~1701Kbyte/sec. Is it an overheard at the ADSL level I don't understand? Could it be the ISP doing it? If it's active throttling it can't be on single connections since 2 high speed connections still go up to ~1500KByte/sec. It's not an example on torrents or other complex situations. The tests were on Ethernet, but I doubt the results would be different on wireless. I wonder if the settings of those connections at my end could be doing it, e.g. MTU settings, though I haven't touched the defaults of a common Realtek NIC.

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• Need suggestion for FireFox add-on to simplify tweeting with multiple accounts.

  - by JohnFx

  I've been using the Firefox Shareaholic browser add-on to post links quickly to my twitter account, and am very happy with it. Recently, however, my company has tasked me with updating our corporate twitter account too. Unfortunately, it doesn't seem to offer the ability to register multiple twitter accounts and let you select one when you tweet the current page. I'm looking for suggestions on a browser add-on for Firefox to do just this. Just to be clear, I'm not looking to be able to post a single link to multiple twitter accounts at one time. I just want a one click "twitter this" that lets me pick which account to post it to. Bonus: If you know a workaround to do this in Shareaholic, that would be even better.

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• windows - batch moving files to another folder/directory

  - by jdamae

  I am getting an error message to the effect of unable to move files to a single file. I am not trying to do this. What I am trying to do is move files from one folder to another folder (staging) and then deleting the original folder. If you can show me a better way to do this since I am not doing this correctly. Thank you. Here is my .cmd file: Y: move "Y:\ABC_files\*.js" "C:\Documents and Settings\user\Desktop\ABC_Stage\ABC_files\" move "Y:\ABC_files\*.css" "C:\Documents and Settings\user\Desktop\ABC_Stage\ABC_files\" move "Y:\ABC_files\*.png" "C:\Documents and Settings\user\Desktop\ABC_Stage\ABC_files\" move "Y:\ABC_files\*.htm" "C:\Documents and Settings\user\Desktop\ABC_Stage\ABC_files\" move "Y:\ABC_files\*.gif" "C:\Documents and Settings\user\Desktop\ABC_Stage\ABC_files\" move "Y:\ABC.htm "C:\Documents and Settings\user\Desktop\ABC_Stage\" rmdir "Y:\ABC_files" C:\"Program Files"\"App X"\App-IDE.exe -r ABC4.run

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• Pure functional programming and game state

  - by Fu86

  Is there a common technique to handle state (in general) in a functional programming language? There are solutions in every (functional) programming language to handle global state, but I want to avoid this as far as I could. All state in a pure functional manner are function parameters. So I need to put the whole game state (a gigantic hashmap with the world, players, positions, score, assets, enemies, ...)) as a parameter to all functions which wants to manipulate the world on a given input or trigger. The function itself picks the relevant information from the gamestate blob, do something with it, manipulate the gamestate and return the gamestate. But this looks like a poor mans solution for the problem. If I put the whole gamestate into all functions, there is no benefit for me in contrast to global variables or the imperative approach. I could put just the relevant information into the functions and return the actions which will be taken for the given input. And one single function apply all the actions to the gamestate. But most functions need a lot of "relevant" information. move() need the object position, the velocity, the map for collision, position of all enemys, current health, ... So this approach does not seem to work either. So my question is how do I handle the massive amount of state in a functional programming language -- especially for game development?

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• I have an "amoeba" game mechanic. Any idea on how to implement it?

  - by Jason

  Outside of a tetris clone, a crappy 2D top-down shooter, and some messing around with stuff like Unity and Flixel, I realize that I have yet to complete a single, polished, bells-and-whistles game. I want to change this, and I have an idea for my next project. The idea is that you're an amoeba. Amoebas have these eye-like cores (or something like that, I don't know biology), and you have two of 'em. You control one with WASD and the other with IJKL. There has to be a constant radius of stuff around each of the cores: And the area of the amoeba has to stay constant. So if you move a core in one direction, you increase the amoeba's area, but that increase is compensated by a decrease somewhere else: Aaaaaand I'd like to implement a vagination mechanic. You absorb things by engulfing them, like a boss. Maybe even an extra core, or a needle that pops you and causes all your inner stuff to start gushing out: But here's the problem: I don't know how to make this. However, I would like some ideas on how to implement it. Should I explore physics libraries like Box2D? Or maybe something involving fluid physics? Any help would be much appreciated. P.S. Feel free to steal this idea. I have plenty of ideas. If you do, please tell me how you made it so I can try it myself.

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• AdSense (reports) and custom channels

  - by RobbertT

  Please help me to further understand custom channels. As Google says it is a way to map your ads, but I still have a few questions: Is it correct that a single custom channel per 1 ad is not very useful, since you can specify Ad blocks in the AdSense reports? I have multiple Ads in multiple custom channels. After this I created 1 custom channel and added all the ads to it. I made this channel targetable, so people can target through this channel on all ads at once. Is this a good way to do it? In other words, is it possible to have ads in multiple custom channels (without targeting, just for analyzing) and then create 1 custom channel with targeting that embraces all the (desired) ads? Why is it not possible for me to analyze custom channels (or ad blocks & formats) per site in the Adsense (reports). Or am I doing something wrong? If not, I have to create different custom channels per site to see how certain ads are doing on a site level?

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• Set 802.1Q tagged port on VLAN1 on Dell PowerConnect switch

  - by Javier

  I'm having big troubles when adding this Dell switch to my network. Here we use several VLANs to segment traffic. All switches (3com and DLink mostly) have configured the same VLANs, most ports are 'untagged' and belong to a single VLAN, except for the ports used to join together the switches (in a star topology), these ports belong to all VLANs and use 802.1Q tags. So far, it works really well. But on this new switch (a Dell PowerConnect 5448), the settings are very different (and confusing). I have configured the same VLANs, an the uplink ports are set in 'general' mode (supposed to be fully 802.1Q compliant), I can set the VLAN membership as 'T' on these ports for all VLANs except VLAN 1. It always stay as 'U' on VLAN 1. Any ideas?

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• Gave a talk at SoCal Code Camp at USC today titled “Linq to Objects A-Z”

  - by dotneteer

  I gave a talk at SoCal Code Camp on Linq to Objects. With careful categorization of Linq functions, I was able to cover the entire set of Linq functions in only 35 minutes. I was able to spend the rest time on demos. In my first demo, I show I was able to write a top 20 URL type of query using 4 lines of library code and 9 line of Linq code without tools like Log Parser. I also demonstrated that I only need to change 2 lines of code from querying a single log file to a whole directory of log files. It would be as simple to run the query against multiple servers in parallel. In my second demo, I discussed how to turn into graph depth-first-search (DFS) and breath-first-search (BFS) in the a Linq queryable problem. The class LingToGraph contains the only DFS and BFS code I ever have to write; the rest could be done the the lambda passed to the DFS or BFS calls. In future blogs, I will provide more details explanation of code. Links: Link to Powerpoint slides. Link to demos.

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• How do I securely store and manage 180 passwords?

  - by Sammy

  I have about 180 passwords for different websites and web services. They are all stored in one single password protected Excel document. As the list gets longer I am more and more concerned about its security. Just how secure, or should I say insecure, is a password protected Excel document? What's the best practice for storing this many passwords in a secure and easy manageable way? I find the Excel method to be easy enough, but I am concerned about the security aspect.

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• Practical way to set up an email inbox for testing?

  - by Ben Collins

  I need to test a high-volume email application. Up to now, I've just been using gmail ad-hoc aliases ([email protected]) to receive emails and see that the content is right. However, I now need to verify a recipient list, which means I need to get every single email that goes out on a particular test run. The problem with Google isn't clear, but there's some throttling somewhere (perhaps from SendGrid, who is my delivery provider), and only a very small number of those emails ever make it to my acount. So: what's a practical way to get where I want to be? Is there a way to get gmail to just accept everything? Is there a web app / service somewhere that will let me throw up a fake email address that can receive for a large number of recipients? Is there something else?

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• Dediced server for all network functions?

  - by Alan

  I want to set up a fictional network configuration for a school in my neighborhood. They have about 50 computers altogether, 2X20 in computer rooms for students and another 10 scattered around for various professors. They should all access the internet through a dedicated Linux router machine. What they would like is to have domain names for those three computer groups. Lab1, Lab2 and Professors. The computers in Lab2 and Lab1 should have static ip and should all be named by numbers. So there should be 1@Lab1, 2@Lab1.... etc. And the Professors network should have a DHCP, with authentication. Is it an ok solution to have all these functions on a single server? (The one which will be used as a router) Do I have to set a local DNS for domain naming? Do the host names for Lab computers have to be set on the clients, or can they be automatically assigned?

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• Asking for Credentials, when requesting shared folders on the server, regularly for domain users?

  - by MFH

  In our network, single domain controller, when some users (members of the domain) request shared folders on the server they are required to enter their credentials, the server is Windows Server 2008 R2, even checking to remember my credentials doesn't work, sometimes it shows this message: "The system has detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you", sometimes it shows different messages, when I try to recreate the case sometimes I failed, I searched Google for it, I didn't find useful results, some talk about kerberos, but we don't use kerberos, this keeps going each day or two, how to overcome this, I don't want these messages to appear to users?

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• Strategies for avoiding SQL in your Controllers... or how many methods should I have in my Models?

  - by Keith Palmer

  So a situation I run into reasonably often is one where my models start to either: Grow into monsters with tons and tons of methods OR Allow you to pass pieces of SQL to them, so that they are flexible enough to not require a million different methods For example, say we have a "widget" model. We start with some basic methods: get($id) insert($record) update($id, $record) delete($id) getList() // get a list of Widgets That's all fine and dandy, but then we need some reporting: listCreatedBetween($start_date, $end_date) listPurchasedBetween($start_date, $end_date) listOfPending() And then the reporting starts to get complex: listPendingCreatedBetween($start_date, $end_date) listForCustomer($customer_id) listPendingCreatedBetweenForCustomer($customer_id, $start_date, $end_date) You can see where this is growing... eventually we have so many specific query requirements that I either need to implement tons and tons of methods, or some sort of "query" object that I can pass to a single -query(query $query) method... ... or just bite the bullet, and start doing something like this: list = MyModel-query(" start_date X AND end_date < Y AND pending = 1 AND customer_id = Z ") There's a certain appeal to just having one method like that instead of 50 million other more specific methods... but it feels "wrong" sometimes to stuff a pile of what's basically SQL into the controller. Is there a "right" way to handle situations like this? Does it seem acceptable to be stuffing queries like that into a generic -query() method? Are there better strategies?

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• Cascading KVM switches

  - by einpoklum

  I have a not-so-small number of computers (say, 5) which I want to access with a single keyboard, USB and monitor. I can get an 8-port KVM switch, which is a pretty expensive piece of hardware; however, in theory, I should be able to cascade KVM switches: Have one 4-port KVM switch between 2 other KVMs (a 2-port and a 4-port). Is this doable (with typical off-the-shelf switches and cables)? Has anyone had experience doing this? Note: I'm interested in USB-only for the keyboard and mouse, and either VGA or DVI for the display. Audio and PS/2 connections are irrelevant for me..

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• Can't change folder background

  - by newcomer

  I tried to change via dragging from the Backgrounds and Emblems window, but the icon just goes back to that window rather than changing the folder background.However, I can change the task bar by this drag-n-drop. Probably it is something about changing ownership permission? if so how to change that? In /home/mashruf/.gconf/apps/nautilus/preferences/%gconf.xml file it says:, Should I change this file? how? <?xml version="1.0"?> <gconf> <entry name="click_policy" mtime="1297597800" type="string"> <stringvalue>single</stringvalue> </entry> <entry name="default_folder_viewer" mtime="1297597336" type="string"> <stringvalue>list_view</stringvalue> </entry> <entry name="media_autorun_x_content_open_folder" mtime="1297534321" type="list" ltype="string"> </entry> <entry name="media_autorun_x_content_ignore" mtime="1297534321" type="list" ltype="string"> </entry> <entry name="media_autorun_x_content_start_app" mtime="1297534321" type="list" ltype="string"> <li type="string"> <stringvalue>x-content/software</stringvalue> </li> </entry> <entry name="start_with_location_bar" mtime="1297300028" type="bool" value="true"/> <entry name="side_pane_view" mtime="1297269334" type="string"> <stringvalue>NautilusTreeSidebar</stringvalue> </entry> <entry name="navigation_window_saved_maximized" mtime="1297600306" type="bool" value="false"/> <entry name="navigation_window_saved_geometry" mtime="1297600306" type="string"> <stringvalue>964x608+59+2</stringvalue> </entry> <entry name="sidebar_width" mtime="1297390418" type="int" value="192"/> </gconf>

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• further troubleshooting on a p8z77 motherboard

  - by Journeyman Geek

  I just bought a brand now asus p8z77 motherboard with a intel 3770. Its currently not booting - the system powers up for half a second and then powers down, and the CPU error light shines. I've tried switching ram between slots, switching PSUs, updating the bios (which can be done sans processor or ram on this model). Power: The 8 pin power connector is definitely in place correctly, and I've tried swapping PSUs between a new seasonic m12, and a known good cheapie PSU Ram: Ram is in the recommended slot for single stick operation, and tried swapping between the two sticks of DDR3 I have. Processor: Its installed correctly as far as I can tell, no obvious bent pins on the motherboard. At this point I'm guessing I'll need to RMA something. Are there any 'definitive' tests I can try, short of swapping CPU and motherboard that would let me know it is the CPU? Can I actually trust the error light on the motherboard?

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• Abbreviations override in comments and quoted text

  - by dotancohen

  I have the following handy abbreviation in VIM: iab for for<Space>(<Space>{{<Esc>kA<Left><Left><Left><Left><C-R>=Eatchar('\s')<CR> This nicely replaces for with the following text: for ( ) { } However, I would like this abbreviation to work only in code, not in comments or in single- or double- quoted strings. How might this constraint be accomplished? Note that I usually code in PHP, but often enough I find myself in other C-style languages (C, Java, occasional C#, etc.). Preventing the abbreviation from working in Python would be a nice bonus though I don't mind manually turning it off in Python if that is not an option. Thanks!

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• How can I set up an FTP user with a home directory inside another user's home folder?

  - by simon180

  Hi I have an Ubuntu (Hardy) server which I am using to host multiple websites. All of the sites are stored in subfolders of a public_html folder for my main login to the server and accessed via a single SSH account. I now have a website user who wants FTP (or similar) access to enable them to upload various files etc to the directory where their website is situated, however I still need the SSH account to have access to this directory as I may need to make changes using my master account. Basically I want to create an FTP account (I have VSFTPD installed) for a user with the home directory inside my own user account but they should only be able to read/write to this folder or its subfolders but not go further up the directory tree. How can I achieve this? Thanks

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• Under what circumstances might an IIS6 website be automatically deleted?

  - by E. Anderson

  Late last week my colleagues did some hardware maintenance on one of our vmWare esxi servers. One of the guests is a Windows Server 2003 Web Edition system that runs our low-traffic web sites. We discovered this morning that one of those websites was no longer working with what appeared to be an SSL error. After logging in, I found that the web site in question had been deleted from IIS! Is it possible for this to happen without a user actually going in and deleting that single web site? All of the other sites were fine. The files for the site in question had not been touched. I just re-created the web site, assigned the SSL cert, and everything was working again. When I logged in, I did see the 'Unexpected Shutdown' dialog.

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