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  • how Infiniband speed is related to processor speed

    - by user223231
    I have two exactly the same servers and very curious how to make Infiniband interconnection between them? Both servers' basic specs are: CPU: 32GHz = 2x Intel Xeon X5650, 6 core, 2.66GHz and RAM: 24GB per server (edited) How determine what speed of Infiniband will be enough for perfect interconnection? SDR, DDR, QDR or FDR? My logic is 32Ghz = 32Gb/s and 40Gb one is enough, am I right or it is not that simple?

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  • Apache VirtualHost Blockhole (Eats All Requests on All Ports on an IP)

    - by Synetech inc.
    I’m exhausted. I just spent the last two hours chasing a goose that I have been after on-and-off for the past year. Here is the goal, put as succinctly as possible. Step 1: HOSTS File: 127.0.0.5 NastyAdServer.com 127.0.0.5 xssServer.com 127.0.0.5 SQLInjector.com 127.0.0.5 PornAds.com 127.0.0.5 OtherBadSites.com … Step 2: Apache httpd.conf <VirtualHost 127.0.0.5:80> ServerName adkiller DocumentRoot adkiller RewriteEngine On RewriteRule (\.(gif|jpg|png|jpeg)$) /p.png [L] RewriteRule (.*) /ad.htm [L] </VirtualHost> So basically what happens is that the HOSTS file redirects designated domains to the localhost, but to a specific loopback IP address. Apache listens for any requests on this address and serves either a transparent pixel graphic, or else an empty HTML file. Thus, any page or graphic on any of the bad sites is replaced with nothing (in other words an ad/malware/porn/etc. blocker). This works great as is (and has been for me for years now). The problem is that these bad things are no longer limited to just HTTP traffic. For example: <script src="http://NastyAdServer.com:99"> or <iframe src="https://PornAds.com/ad.html"> or a Trojan using ftp://spammaster.com/[email protected];[email protected];[email protected] or an app “phoning home” with private info in a crafted ICMP packet by pinging CardStealer.ru:99 Handling HTTPS is a relatively minor bump. I can create a separate VirtualHost just like the one above, replacing port 80 with 443, and adding in SSL directives. This leaves the other ports to be dealt with. I tried using * for the port, but then I get overlap errors. I tried redirecting all request to the HTTPS server and visa-versa but neither worked; either the SSL requests wouldn’t redirect correctly or else the HTTP requests gave the You’re speaking plain HTTP to an SSL-enabled server port… error. Further, I cannot figure out a way to test if other ports are being successfully redirected (I could try using a browser, but what about FTP, ICMP, etc.?) I realize that I could just use a port-blocker (eg ProtoWall, PeerBlock, etc.), but there’s two issues with that. First, I am blocking domains with this method, not IP addresses, so to use a port-blocker, I would have to get each and every domain’s IP, and update theme frequently. Second, using this method, I can have Apache keep logs of all the ad/malware/spam/etc. requests for future analysis (my current AdKiller logs are already 466MB right now). I appreciate any help in successfully setting up an Apache VirtualHost blackhole. Thanks.

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  • Avoiding QoS degradation for video streaming clients

    - by aarege31
    Suppose I have two routers connected via a 1Gbit connection. A client behind router 1 streams to a client behind router 2 while other clients behind router 1 transmit data to other clients behind router 2. Are there any best practice policing, scheduling or queue management algorithms available that help a beginner understand what is necessary to prevent QoS degration in simple cases as above as well as in real world environments?

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  • Setting a mail server without root?

    - by Legend
    Is it possible to setup a mail server on a Linux machine without root permissions? I want to be able to create two aliases for a given mail ID. But if I remember correctly, it is no possible to do this without root privileges because I need to edit the configuration file and then restart the mail server. Does anyone have a suggestion to get around this problem?

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  • Samsung SSD SMART failure warning on macbook proA

    - by user37303
    My 9 month old 256GB Samsung SSD is now reporting the following SMART failures: Rsvd_Blk_Cnt_Chip FAILING NOW 184 Available_Reservd_Space FAILING NOW 20 Can anyone explain the meaning of these two attributes that appear to be failing (Rsvd_Blk_Cnt_Chip and Available_Reservd_Space? Also, also aren't SSDs much more immune to these types of failures? Everything seems to be working fine now, but I'm fearful of a looming failure.

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  • Automatically log off idle Windows 7 console sessions

    - by Josh G
    We have a number of shared computers that users never seem to log out of. Am I correct that there is no built in functionality to automatically log off console sessions after an idle timeout? I've seen two suggestions: a logoff screensaver, and a scheduled task with an idle trigger. Will the idle trigger work if only the session is idle, but the computer is in use with a different session? Is there a better way to go about this? Thanks,

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  • Full File Path in Reference to Another Workbook in Excel

    - by SHARIQ MUSANI
    I have two Excel files, one on D:\ and the other one on E:\. I reference one from the other, for example, using vlookup in the E: file to search from the D: file, like that: VLOOKUP(A1,'D:\SHARIQ\[FILE NAME.XLS]SHEETNAME'!A1:10,3,FALSE) As long as D:\SHARIQ\FILE NAME.XLS is open, I get the formula in the E: file displayed like this: VLOOKUP(A1,'[FILE NAME.XLS]SHEETNAME'!A1:10,3,FALSE) Why does it remove the whole path?

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  • Idempotent Powershell word search/replace across documents with headers, change tracking, etc

    - by user61633
    I've found one or two guides to doing a word search and replace across multiple documents with powershell. They work well on simple documents. However, the script ignores text in headers and footers; and if "track changes" is enabled, it replaces text which has already been replaced, resulting in multiple copies of the new text if I run the script more than once on the same file. Any clues as to how I can avoid these undesirable behaviors and make this script robust?

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  • Choose source interface for PPTP VPN on Ubuntu

    - by Emyl
    I have an Ubuntu Virtualbox guest with two network interface, eth0 (NAT) and eth1 (bridged). I want to connect to a PPTP VPN using eth1, but I don't know how to specify which interface to use. If i just try: sudo pon myvpn nodetach It fails with: Using interface ppp0 Connect: ppp0 <--> /dev/pts/1 Modem hangup Connection terminated. Looking at routes with route seems to indicate that eth0 is being used: x.x.x.x.no 10.0.2.2 255.255.255.255 UGH 0 0 0 eth0

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  • Which server would you purchase? IBM x3550 or Dell R610?

    - by Harry
    I'm in the market for a single unit rack mounted server with a strong upgrade pathway. The two servers on the top of my wish list are: IBM x3550 M2 Express Followed by Dell R610 Ultimately I want to have a Dual Quad Xeon (2 Ghz+) server with loads of RAM for a top notch DB server. The database is likely to keep growing indefinitly so a snappy Raid 5 array of Harddrives will be essential. Which would you purchase?

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  • Confused about setting up subversion

    - by apache
    I've already compiled and installed subversion, now trying to add users to it. And I find two articles on this, but they seem to be going in entire different direction. The 1st is here, which looks very simple, and seems it's not necessary to create a user account(useradd ...) the 2nd is here, which is a lot more complicated, and seems I need to create a user account for each svn user. Which one should I follow?

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  • Vmware Player network adapters have no network or internet access in Windows 7 enterprise

    - by daffers
    As per the title. My VMWare player installation has setup the two network adaptor VMnet1 and VMnet8 and they are picked up as unidentified networks with no network access (i need this to activate my windows server installation on it). The option to change the network location is not available (this might be because of network policy on the domain despite having set this as configurable in the local security policy section). Is there anyway i can change how these networks are detected or alter the configuration of vmware to get around this?

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  • Information on 50% drop in spam starting Christmas 2010

    - by George Bailey
    Has anybody who administers email servers or spam filtering noticed that in last couple of weeks the spam volume has dropped significantly? Is there a chart provided by one of the major spam filtering companies? Edit: Based on our internal stats, although it varies, on the two weeks starting the day after Christmas (Sunday), spam seems to be coming in about half as much as it did before Christmas.

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  • GNU Screen: one window per screen or one screen with multiple windows?

    - by yalestar
    I've inherited a few sys admin tasks recently and am trying to wrap my head around using screen. The way the previous guy left it, there are four screen sessions running, some of which have two or three windows running within. It doesn't appear that he was using any particular convention, so I ask you: Is it better to have each process in its own screen session, or better to group similar processes into a single screen? Or something different entirely?

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  • Improve backup performance by watching files added/modified in given directories?

    - by OverTheRainbow
    I use SyncbackSE on Windows to back up files between two hard drives daily. Every time the application starts, it scans every single file in the directories that it watches before copying files that were added or modified. To improve performance, I was wondering if there were a Windows backup application that would hook into Windows to keep tracks of files that were added/modified in given directories, so that it only needs to go through this list when it comes time for a backup. Thank you.

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  • How do I password protect my printer in Windows 7?

    - by Dillie-O
    I have two young kids who have gotten rather computer saavy. They love playing their games, especially when it allows them to print out awards or coloring pages. Unfortunately this means that in the time it takes to refresh my cup of coffee, they can easily drop a 10 page document into the printer queue, and my printer ink runs out rather fast. How would I setup some kind of password protection on the printing, so that I would have to do some kind of final approval before they get their printouts?

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  • Does Windows 7 deleted files generated during hibernation?

    - by Koffeehaus
    Somebody was using my Windows 7 and she hibernated it instead of shutting down. Later, I booted up Ubuntu and moved about 2GB worth of files from the Ubuntu partition to the Windows partition. After booting up Windows (from hibernation), I couldn't find any of the files. Then I restarted the PC, and the files showed for a second or two and then disappeared. Did Windows delete all the files I put on it while it was hibernating?

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  • How many Tomcat instances can one application server handle?

    - by NetworkUser
    My network engineer states I am part of a cluster where two apache application servers(512G RAM each) have 142 instances each of Tomcat (of which my company represents 6 each with 2G RAM). This seems like a lot and my latency issues move with the hour of the day - 7AM CST software functions fine, 10AM CST - system slows significantly this slowness continues until 6PM CST. My question is how many Tomcat instances can one application server handle?

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  • How do I disable animations in Preview in Lion?

    - by c00kiemonster
    For example, open up a pdf and set view to two pages and hit arrow key up/down. Is there a way to get rid of the animation? Preview feels really snappy and fast, and to have animations like that just spoils all the fun. Might seem like a proper first world problem, especially if you're just a casual user of pdfs. But I frequently have 10+ pdfs open for referencing purposes (that is, a lot of flicking back and fourth), and the animation just drives me nuts.

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