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  • Would a PHP application benefit from being served from a RAM drive?

    - by Tom Marthenal
    I am in charge of hosting a PHP application that is large and slow, but easy to scale. The application is entirely static, with writable disk storage needed. We've profiled the application, and the main bottleneck appears to come from loading the application and not the work the application does. The application is not CPU-intensive, although it does use a fair amount of memory (think Magento). Currently we distribute it by having a series of servers with the same PHP files on their hard drive and a load balancer in front of them. Easy but expensive. I've been reading about RAM disks and the IO benefits they offer, and was wondering if they would be well-suited to PHP applications. Since PHP applications are loaded from disk for every request and often involve lots of different files (as opposed to being kept in memory like with a Java application), I would figure that disk performance can be a severe bottleneck. Would placing the PHP files on a RAM disk and using the mount point as Apache's document root offer performance benefits? A startup script could create the RAM drive and then copy the files (which are plain-text and small) from a permanent location to the temporary RAM drive. Does this make sense, or should I just trust the linux kernel to cache the appropriate files in memory by itself?

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  • New to server admin, Diagnosing Memory and CPU issues on DV

    - by G Thompson
    Sorry for my ignorance and lack of knowledge. I'm a PHP/Front-end developer just now venturing into very minor server management/diagnostics. I have a Media Temple DV account. I have 2 sites that run a PHP script through a subscription service to an API. Basically API hits site with said script. Script runs, gathers data from api, saves data to SQL database. I noticed that these sites seemed to causing memory overages on my server (not sure why). So I temporarily disabled them. The memory overage alerts stopped but my CPU still sits really high, like at 115% and above. I'm trying to diagnos this with tutorials and resources but just can't seem to find a solution. I'll attach screenshots(screenshots are without the PHP scripts I assume are responsible for the memory issues) I'm assuming are important to the diagnosis, but if anyone can point me in the right direction to start A. figuring out if and why the PHP script may be causing memory overages and B. Why my CPU is always over 100%. Thanks guys! Links to screen shots... can't post with low points. http://i.stack.imgur.com/A64k4.png http://i.stack.imgur.com/qm1rV.png

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  • Windows Server wbadmin recover with commas

    - by dlp
    I want to do a recovery of files with commas in their names from the command line, ala: wbadmin start recovery -version:10/01/2013-12:00 -itemType:File -overwite:Overwrite -quiet "-Items:C:\Path\To\File, With Comma.txt,C:\Path\To\File 2, With Comma.txt" So there are two files: C:\Path\To\File, With Comma.txt C:\Path\To\File 2, With Comma.txt The problem is wbadmin assumes commas separates each file, so it sees 4 files specified instead of 2. I've tried putting a \ in front of commas that are part of the file names like so: wbadmin start recovery -version:10/01/2013-12:00 -itemType:File -overwite:Overwrite -quiet "-Items:C:\Path\To\File\, With Comma.txt,C:\Path\To\File 2\, With Comma.txt" but it doesn't work, it just says there's a syntax error. The documentation on Technet doesn't seem to mention anything that'll help either. OS is Windows Server 2008 R2. A clarifying comment: I've changed the file names to be different than the actual names to be less revealing, but I also see I dumbed it down too much. The comma can occur either in the file name itself like C:\Path\To\File, With Comma.txt' or in the path to the file, like:C:\Path, To\Other\File.txt`.

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  • How do I configure IIS to allow access to network resources for PHP scripts?

    - by Dereleased
    I am currently working on a PHP front-end that joins together a series of applications running on separate servers; many of these applications generate files that I need access to, but these files (for various reasons) reside on their parent servers. If I, from the command line, issue a bit of script such as: <?php var_dump(glob("\\\\machine-name\\some\\share\\*")); I will get the full contents of that directory, proving that there's no problem programmatically with PHP reading the contents of a UNC share. However, if I try to execute the same script from the web server, I get an empty array -- more specifically, if I use more explicitly functions designed to "open" a directory like it was a file, I get access errors. I believe this to be a permissions issue, but I am not a server/network administrator type, so I'm not sure what I need to do to correct this and get my script running, and the links I've checked out have not been a terrible amount of help, perhaps due to my background, or lack thereof as far as IIS is concerned, coupled with the fact that we are not actually using .NET for this. Relevant Stats: Windows Server 2008 Standard SP2 IIS 7.0 PHP 5.2.9 I will be connecting to two types of servers: a few other nearly-identical Server 2008 machines, and a machine running embedded XP. Links that have not been particularly helpful but maybe I am just misreading: http://support.microsoft.com/?id=306158 http://support.microsoft.com/kb/207671/EN-US/ http://support.microsoft.com/kb/280383/

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  • Server Intermittently Inaccessible Externally (but Accessible Internally Continuously)

    - by nicorellius
    I have a CRM on a server on a network. We have a static IP and another server outward facing. We use port-forwarding to map to the CRM, so that when you go to the IP or the FQDN, you get to the CRM: xxx.xxx.xxx.xxx crm.example.com Internally, we can access the CRM by going to crm or crm.example.com Lately, I've been noticing that accessing the server from outside the network times out or gives 503, bad gateway. During that time, I can also SSH (different port, so this works) into the outward facing computer and access the server just fine. I have a robot monitoring the site and indeed via HTTP monitoring the site is going down periodically. I looked through the Apache server access and error logs and nothing stuck out at me so I'm a bit confused as to what could be going on. I also searched the access logs for 503 and found nothing. When I run tracert from outside the network, it appears the packets basically make it through the wider area servers (Comcast city and county servers) and end up dropping at the CRM server's front step. I'm tempted to replace the server because it is older and underpowered but it would be nice to know what is going on. Any ideas what to do next?

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  • Microphone array support in Windows. Info on performance and compatible hardware?

    - by exinocactus
    It is officially claimed by Microsoft (Audio Device Technologies for Windows), that Windows Vista has an integrated system-level support of microphone arrays for improved sound capturing by isolating a sound source in target direction and rejecting ambient noise and reverberation. In more technical terms, an implementation of an adaptive beamformer. Theoretically, microphone arrays with 2-4 mics can substantially improve SNR under some conditions like speaker in front of the laptop in noisy environment (airport, cafe). Surprisingly, though, I find very little information about commercially-available products supporting these new features. I mean products like portable usb micropone arrays or laptops or flat screens with integrated mic arrays. I could only find info about two laptop models having "noise cancelling digital array microphone". These are Dell Latitude and Eee PC 1008P-KR. Now my questions: Do you have any experience with the Windows beamformer implementation? For instance, in the above mentioned laptops. How well does it work? Are there any tests results available in the net or in print (papers?)? Do you know about other microphone array hardware? What could be the reason why mic array technology didn't get sucess Is there mic arrays support in 'Windows 7'?

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  • Hostname vs webpage domain.

    - by Mark
    Hi All, Im just starting to look at deploying a webpage and get into the joy of DNS etc. And im wondering how you set up multiple web-servers all with thier own hostnames/public IP addresses, and yet have them serve up a webpage from one domain. For example, lets say you have a website example.com, and an A record in DNS that points at it's IP address of 1.2.3.4 . You want to have two servers, prod1 and prod2 with some kind of load balancer in front of them for fail over reasons. The way I see it you would want to have the hostnames of these servers as prod1.example.com and prod2.example.com and perhaps loadb.example.com. How would you set up the DNS so this would all work. ie you could ssh to any of the server domains, prod1.example.com, prod2.example.com or loadb.example.com and also just use the www.example.com url to go to the website. And would all these server names be resolvable from the public internet and is that safe? This would be a linux environment, for arguments sake ubuntu, a django framework dynamic website, running in apache 2.2 Cheers Mark

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  • Installing a new Motherboard in a HP xw6200 case

    - by thing2k
    I have a HP xw6200 Workstation, that is rather long in the tooth, and with 2 physical CPUs, it is quite inefficient. So, the plan was to upgrade the internals. Nothing special: AMD Athlon II X4 640 ASUS M4A78KT-M LE (mATX) 2x 2GB DDR3 1333MHz RAM. 3p under my £150 budget The issues: The pin connector for the front panel isn't a good fit, but I can trim it to size. The PSU has a 8-Pin Power connector, unsurprisingly, the new board has a 4 pin socket. The pins do line up, but I would have to cut it in half to fit. Finally, due to the weight of heat-sinks, they are screwed directly into the case. It turns out that these screws also lock the motherboard in place. As to remove it, you remove the heat-sinks, slide the motherboard across and lift it out. I tested the new board for fit, and while it slots in fine, it's not secure. There is nowhere to screw the board down, it is just held in place with plastic standoffs. The only idea I had, was to wedging something between the side of the motherboard and part of the case. Any suggestions?

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  • How can I automate or script daily downloads for any new anti- virus databases, and then have the program scan my drive?

    - by Macgrimm
    Howdy all Super Users" I humbly ask if any Super User can direct this long time, gray haired Apple Tech in the right direction on this issue. I believe there probably are many ways to skin this cat. But I am looking to find simply the best, most unattended way to get it done. Any help will be greatly appreciated. also (I know there are much better softwares out there for the Mac so please don't go there! The politics of this company dictate which Anti virus we have to use) anyway without any further wait: basically I am trying to automate 2 very important functions of Mc'Afee anti-virus for Mac. First I want to automate the process of retrieving new virus definition files, and second I want to automate the process of scanning for viruses. It turns out that Using Mc'Afee Anti-Virus for the Mac are both manual functions. And they left up to the user (per user account) to perform. Depending on all of about 150 MAc users to perform these 2 tasks themselves is around 65% compliance. My question then is: If I wanted to use the command line such as (open /Applications/McAfee\ Security.app) It will open up the Security Console. But how can I make command Mc'Afee go out and grab the definition files and scan the computer? I have to admit I am at a crossroad and Macaltimers has set in. I would really appreciate it if any of you "Super ~ Users" can help me out with this MacAltimers loss of how to what to do. Thanks to All up Front Macgrimm

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  • Need help ttoubleshooting PC

    - by brux
    I have had problems since my dog pee'd on my computer. Problem: loads windows fine, at random intervals from 5 minutes to 30 minutes it restarts itself. There is nothing in the event log such as errors, no BSOD, just cold restart. after rstarting - sometimes- it POST's and restarts itself at the end of POST. It will do this many times and then finally load windows. The cycle then begins again, it will restart eventually. What i have done: I thought it was HDD at first, since this is the only part of the coputer which actually got wet with any fluid ( the case is off the PC and the dog pee'd down the front where the HDD is located). Seatool, the seagate HDD tool, found errors when I ran it inside windows, so I ran it in DOS mode from bootable USB and ran it. It found the same number of errors and fixed them all. I ran the scan again and it says "Good". I loaded windows and ran the scan and it also said "Good there. So the HDD apears to be fine but the problem persists, random restarts. What else could this be? I have taken the computer apart and cleaned everything and also taken the PSU apart and cleaned it thoughrouly. The problem still persists, what should my next steps be? Thanks in advance.

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  • Reverse web proxy with time constraints

    - by user2893458
    I have a web application which produces several unique URLs of the type http://service.company.com/service.html?type=aaaa&key=jfiZm6u6cW where the last part is a randomly generated key. Each such URL provides access to an instance of the service provided. I am looking for a way to restrict access to those URLs based on time constraints, as an example URL#1 should be available between 8:00AM and 10:00AM on May 30, URL#2 should be available between 10:30AM and 12:00PM on May 31, and so on. I already have a resource scheduling application based on Drupal and would like to find a way to include those URLs as scheduled resources. The web application is deployed on Apache Tomcat, so I don't have the knowledge or the resources to alter it, therefore I thought that I could put some sort of reverse proxy in front of the web app that could implement the time constraint feature. In my thoughts the reverse proxy would allow or disallow access to each URL based on the rules that my scheduling application would provide. There may be other ways to deliver such a solution, but I can't think of anything better, so the question is: is there a reverse web proxy architecture that could allow access to the destination URLs based on time and date rules? Any other ideas are more than welcome.

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  • apache chokes after 300 connections

    - by john titus
    We have an apache webserver in front of Tomcat hosted on EC2, instance type is extra large with 34GB memory. Our application deals with lot of external webservices and we have a very lousy external webservice which takes almost 300 seconds to respond to requests during peak hours. During peak hours the server chokes at just about 300 httpd processes. ps -ef | grep httpd | wc -l =300 I have googled and found numerous suggestions but nothing seems to work.. following are some configuration i have done which are directly taken from online resources. I have increased the limits of max connection and max clients in both apache and tomcat. here are the configuration details: //apache <IfModule prefork.c> StartServers 100 MinSpareServers 10 MaxSpareServers 10 ServerLimit 50000 MaxClients 50000 MaxRequestsPerChild 2000 </IfModule> //tomcat <Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol" connectionTimeout="600000" redirectPort="8443" enableLookups="false" maxThreads="1500" compressableMimeType="text/html,text/xml,text/plain,text/css,application/x-javascript,text/vnd.wap.wml,text/vnd.wap.wmlscript,application/xhtml+xml,application/xml-dtd,application/xslt+xml" compression="on"/> //Sysctl.conf net.ipv4.tcp_tw_reuse=1 net.ipv4.tcp_tw_recycle=1 fs.file-max = 5049800 vm.min_free_kbytes = 204800 vm.page-cluster = 20 vm.swappiness = 90 net.ipv4.tcp_rfc1337=1 net.ipv4.tcp_max_orphans = 65536 net.ipv4.ip_local_port_range = 5000 65000 net.core.somaxconn = 1024 I have been trying numerous suggestions but in vain.. how to fix this? I'm sure m2xlarge server should serve more requests than 300, probably i might be going wrong with my configuration.. The server chokes only during peak hours and when there are 300 concurrent requests waiting for the [300 second delayed] webservice to respond. Please help..

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  • Can I set up arbitrary filesystem redirection in Windows?

    - by Jon
    I am sitting in front of a Windows 7 machine that has no drive Q:. Is it possible to arrange for accesses to Q:\somedir to be redirected to an arbitrary location on the existing filesystems (for example, C:\Windows)? I would especially like a "set it and forget it" option, if one exists. I am assuming (although I have not tried it) that it is possible to use SUBST to mount an existing (empty, created for this purpose) folder as drive Q: and then MKLINK /J to create a directory symbolic link from Q:\somedir to wherever I want. However, this approach has a couple of drawbacks that I would like to avoid if possible: The drive Q: will be visible in the system. It is not as clean as I would like (removing the mounted folder will break it; a batch script needs to be manually added to the system startup). Is there a better option? If there is none and I am forced to make compromises, what is the closest I could get to the ideal solution? Assume anything is up for discussion.

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  • Apache Virtual Host Issue

    - by Nik
    I think I hate Apache now, but on with the issue. It might be a configuration error on my end or just my inability to see what's right in front of me, but I'm trying to configure a sub-domain in Apache and no matter what, it always redirects the sub-domain to the web root of the main domain. My configuration is posted below (and yes, the domain name information was purposefully modified): <VirtualHost *> DocumentRoot /var/www/root/ ServerName example.com <Directory /var/www/root/> allow from all Options +Indexes </Directory> </VirtualHost> <Directory /usr/share/squirrelmail> Options Indexes FollowSymLinks <IfModule mod_php5.c> php_flag register_globals off </IfModule> <IfModule mod_dir.c> DirectoryIndex index.php </IfModule> # access to configtest is limited by default to prevent information leak <Files configtest.php> order deny,allow deny from all allow from 127.0.0.1 </Files> </Directory> # users will prefer a simple URL like http://webmail.example.com <VirtualHost *> DocumentRoot /usr/share/squirrelmail/ ServerName squirrelmail.example.com </VirtualHost>

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  • Mod_pagespeed, Varnish and Apache cache issues after new code pushes

    - by WerkkreW
    I have a rather strange issue. In my environment we are running a load balanced cluster of 8 apache servers with a master-master MySQL backend. In front of apache we have Varnish in the cache layer. We have been running Apache mod_pagespeed for several weeks now and for the most part it has been working great. The issue arises when we do fresh code updates from Git, and and/all of the JS/CSS assets change. Basically the problem appears to be two fold. One, after the code push we generally take the opportunity to flush varnish, restart apache, and restart varnish. In doing this all of the mod_pagespeed combinied/minified files are cleared out ensuring that all of the new JS/CSS assets are fresh. The problem is, upon doing this the file names that mod_pagespeed creates change, but the old files (appear) to be still cached for many people client side leading to very unexpected results. However, if we do not restart apache, the changes to the files may or may not appear client side due to the cached minified assets. The simple solution is to disable mod_pagespeed, however I would rather not do that as it has made a fairly large impact in performance. I feel as if there must be a better way to deal with the inconsistencies in cache between the client and server to prevent having people to go to great lengths or perform a large number of page refreshes to see a working page. I can provide configuration snippets if anyone needs them. If you would like to inspect the site, source, headers, or anything try the following addresses: http://wellplayed.org http://wellplayed.org/tv Thanks in advance!

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  • How to modify a message, so it will be for 100% recognizable as spam by Exchange junk e-mail filter

    - by user71061
    Hi! I have an sendmail server, sitting in front of my Exchange server. This server filter spam with SpamAssassin (and do it incredibly well!), but it merely tag spam messages with appropriate header flags and by modifying message subject. When such a message arrives to user mailbox on Exchange server, where it is examined by Echange/Outlook junk e-mail filter, which put most of spam in junk message folder. And that is my problem: most, but not all! To put all spam in junk e-mail message folder, user has to define an rule, saying f.e: "If header contains text 'X-Spam-Flag: YES' then move it to 'Junk e-mail messages' folder". Fine, but it has to be done on every user (for some users, this task is too "complicated" to made it themselves :-) . So I want to know, how could I modify message header in such a way, that Exchange junk e-mail filter will for 100% recognize this message as a spam, freeing user from task of defining his own rule. Some solution could be defining such a rule by using AD and group policy, but I wan't to avoid this due to many possible caveats: there are so many combination of different operating system and different Outlook versions, and to be honest, I doubt if it is even possible.

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  • extra managed+unmanaged switches @ home/office -- best (mis)usage scenario? what would you do?

    - by locuse
    up front -- definitely NOT a mission-critical kind of question. after a 'spring cleaning' of my local office, i've ended up with two 'spare' GigE switches at my home/office -- one managed, capable of VLANs, QoS, etc, and the other unmanaged. i've got more ports than i need. in fact EACH switch has more total ports than i need. but, since i can't have these just sitting around not doing SOMETHING ... ;-) i'm interested in ideas for best combined use of these switches. my local topology is simple: [ net ] -- [ adsl2 modem ] -- [linux firewall/router/DNS ] _______________| | [ some arrangement of the 2 GigE switches ] | ( ... stuff on the lan ... ) [WAP1] [voip ATA] [printer] [desktop1] [mail server] [Xen server [desktop2] ( mostly dev, [desktop3] + file server [desktop4] + media server)] the MailServer is a production mail server the XenServer serves some low vol to the 'net; the MediaServer guest serves ONLY to the LAN is there, e.g., any performance value in segmenting off any of the LAN using the managed switch (VLAN? QoS tagging? something?), feeding the rest into the connected unmanaged switch? or should i simply use one of the switches & be done with it, and use the other for a coffee-cup stand?

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  • How do I connect to and factory reset a Catalyst 3560 Switch?

    - by Josh
    My company just bought another company. In their server room they had some older hardware, which I would like to repurpose. One of these is a Cisco Switch: C3560G-48TS-S. I found some instructions about this switch here but this is not a guide for a beginner. I have no idea how to connect to this thing to begin running the commands. It says Configure the PC terminal emulation software for 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control. But I can't find anything on how to do this (assuming with telnet?) or even what program to use. I also don't know how to find the IP address of the device to connect to it. My research also says once I get in there, I need to run clear config all Is this the right command? Also, what if I can't get the username and password for these devices? Is there some way to factory reset (my only experience is with devices that have a hardware reset button) EDIT: I should note that when I push the button on the front the three lights blink, which according to the documentation indicated the switch is configured and "not available for express setup"

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  • Let varnish send old data from cache while it's fetching a new one?

    - by mark
    I'm caching dynamically generated pages (PHP-FPM, NGINX) and have varnish in front of them, this works very well. However, once the cache timeout is reached, I see this: new client requests page varnish recognizes the cache timeout client waits varnish fetches new page from backend varnish delivers new page to the client (and has page cached, too, for the next request which gets it instantly) What I would like to do is: client requests page varnish recognizes the timeout varnish delivers old page to the client varnish fetches new page from backend and puts it into the cache In my case it's not site where outdated information is such a big problem, especially not when we're talking about cache timeout from a few minutes. However, I don't want punish user to wait in line and rather deliver something immediate. Is that possible in some way? To illustrate, here's a sample output of running siege 5 minutes against my server which was configured to cache for one minute: HTTP/1.1,200, 1.97, 12710,/,1,2013-06-24 00:21:06 ... HTTP/1.1,200, 1.88, 12710,/,1,2013-06-24 00:21:20 ... HTTP/1.1,200, 1.93, 12710,/,1,2013-06-24 00:22:08 ... HTTP/1.1,200, 1.89, 12710,/,1,2013-06-24 00:22:22 ... HTTP/1.1,200, 1.94, 12710,/,1,2013-06-24 00:23:10 ... HTTP/1.1,200, 1.91, 12709,/,1,2013-06-24 00:23:23 ... HTTP/1.1,200, 1.93, 12710,/,1,2013-06-24 00:24:12 ... I left out the hundreds of requests running in 0.02 or so. But it still concerns me that there are going to be users having to wait almost 2 seconds for their raw HTML. Can't we do any better here? (I came across Varnish send while cache , it sounded similar but not exactly what I'm trying to do.)

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  • Have some questions about setting up a VPN to my private cloud servers

    - by Pure.Krome
    I've got a number of Virtual Servers running at a pretty big Cloud provider. They are all running Windows 2008 R2. I have a CISCO ASA firewall in front of them. Currently, I've got all ports blocked except 80/443/21/3386 (for Remote Desktop). I asked to have a VPN enabled on the firewall and they said it's easy to do BUT I need to use the 3rd party Cisco software. Now, I don't want to get into a debate about it .. but we don't want to install anything extra on our -client- computers. We all use Windows 7 and we love using the built in VPN client to connect to other private LANS we have setup in other locations. So i'm wondering what options I have to create a VPN tunnel to our private cloud LAN? All our cloud servers are part of WORKGROUP, so there's no Active Directory .. nor do we want to install all that. Secondly, we know we can open up a firewall port - so any ports for starting a VPN is fine! Lastly, I was thinking of just using one of the existing servers as the VPN server (and using the Windows VPN software) .. but I'm not sure this is a good thing? Remember - we just want to use the baked in VPN software in Windows 7 .. which is PPTP or SSTP or L2TP/IPSEC. I would -LOVE- to use some free OSS software. For usernames/passwords? We'd probably just have one account .. like U:Hithere P:whatever.. so we don't need any hardcore account management, like Active Directory, etc. So does anyone have any ideas?

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  • Pc sometimes turns on sometimes not

    - by cprogcr
    Some time ago, the PC gave the same problem. It wouldn't turn on. When i pressed the button, it turned on but showed nothing. I had replaced the CPU and that seemed to work. I didn't use the PC that much, rarely you know. But now, after some time, it gives the same problem. It turns on, the front light is on, it makes the normal noise the pc makes when it's turned on , but if I try to shut it down by holding the power button it just doesn't work. So again, I tried replacing the CPU and it worked again. I kept it all day working, just to be sure, and sometimes I would restart it and it would work again. No problems at all. So I turned it off at night, and next morning it just would make the same problem. So I tried replacing the PSU. And it worked again. Now while I had the PC with the new PSU, i tried to insert the old CPU, and again, it would turn on. The same thing, tried restarting too, and it would work. But this morning the same problem happened. Edit: I also tried another CPU today and yet no signs of working. I don't know now what to think.

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  • Questions for anyone who has used Sun Type 7 keyboards

    - by Irinotecan
    So I noticed that Oracle is still selling Sun Type 7 keyboard and mouse packages. I was thinking of buying one for a Linux box at my house so I had easy access to some of the extra keys such as Compose and Alt-GR. I have some questions though before I do for anyone who has used these -- it's been a very long time since I've used an actual Sun keyboard. They show that both a PC and UNIX layout is available. Unfortunately, I cannot find anywhere a clear picture of both layouts to determine the difference. Can anyone post pictures of the 2 different layouts for me to take a look at? I don't remember what some of the "Solaris shortcut" keys do, like Props, Front, Stop, and Again. Are these vestiges from OpenWindows? Do they have any usage on a modern Solaris like OpenSolaris running Gnome? Do they automatically map to anything useful on Linux, or am I going to have to map them myself to something with XModMap? When I last used a Sun keyboard, I remember it having a rather mushy feel to it, so I am wondering if any touch typists could weigh in on whether this keyboard "feels nice" for day to day touch typing. Thanks!

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  • External HDD connecting via USB disconnects wireless LAN connection

    - by Kensai
    Strange problem. I have this MEDION Akoya PC that has a dedicated bay to slide an external HDD sold separately. It's very handy indeed cause the slot is providing a fast USB 3 connection and power to the HDD unit, without extra cables. All works fine except this show-stopper behavior to disconnect me from the router once I slide in the unit and it powers up. The moment I connect the unit the (normally) three-four WiFi connections I see in my neighborhood disappear and my own to the router loses its signal strength (no Internet traffic is possible). After a while it throws me off that one as well, never to connect me again as long as the unit is powered. Once I disconnect the HDD the various signals come back and it automatically reconnects to my own. What takes? Are we in front of a serious design fault by MEDION here? Does the spinning of the HDD on top of the PC cause electromagnetic interference strong enough to throw off my WiFi connectivity? Is it a simple USB problem? Some kind of strange hardware conflict? Where should I look?

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  • Load Balancing is unusual in Apache in round-robin mode when one of the tomcat is brought down

    - by srayker
    We are facing a unusual behavior with round-robin load balancing on apache when one of the tomcat server is brought down. Our Setup: we have 2 apache web servers on the front end using mod_jk module for load balancing using round robin for load distribution. We also have enabled session stickyness. This is followed by 4 tomcat servers on which the applications are running. Sometimes under heavy load, if there is a slowness in our DB tier we find that eventually one of the tomcat goes into a hung state and would need a restart. The moment we bounce the tomcat we see a spike in requests in one of the server and this would also go into hung state and need a restart. Eventually all the server will face similar condition. What beats me is why does the Apache transfer the whole load to one server instead of distributing the load. We are now trying the worker.balancer.method=B to see if this helps to resolve our issue. Any thoughts on resolving the issue is greatly appreciated. regards, srayker

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  • Reasons for Ajax navigation breaking on Coldfusion/Apache when running an app in iOS fullscreen mode? [closed]

    - by frequent
    Not sure if this belongs to SO or here. I'm running a webApp using jquery, jquerymobile, requireJS and apache, coldfusion8, mysql 5.0.88 serverside. The app works fine until I try to run it in fullscreen mode on iOS (add icon to homescreen, launch app from there with <meta name="apple-mobile-web-app-capable" content="yes" /> specified). This meta tag will break the Jquery Mobile AJAX navigation. The AJAX request will fail and the requested page will be loaded as a new page, thereby restarting the app on every page change. I have chased this through the whole front end starting from requireJS through Jquery Mobiles AJAX navigation down to the AJAX request being made in Jquery. xhr.send( ( s.hasContent && s.data ) || null ); In regular browser this works no problem. In fullscreen mode, this fails (readystate=0, empty response). I have found this article, which argues that fullscreen mode is like a browser instance with different HTTP strings. On ASP.net this results in the browser not being identified by the server and only basic browser settings being assumed (e.g. no Javascript). I'm a little lost where to start looking for possible reasons serverside. I have not written any server code for handling Ajax page navigation, so this must be something that is handled out of the box by Coldfusion or Apache? Question: Where could I start looking for problable causes of fullscreen mode breaking AJAX navigation if I assume Coldfusion or Apache are the culprits? Is there a setting I'm missing in httpd.config? What else could be the problem? Thanks for inputs!

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