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• Apache going straight to 100% mem usage on localhost

  - by Dennis Pedrie

  Hi, I'm running XAMPP on a OS X testing server... I'm the only person sending requests to the server. I've never messed with Apache config before, so I'm kinda without a paddle here. When I start Apache, I get ~10 httpd processes started, and 95% idle CPU. When I request a WordPress page, the CPU usage goes to 50%, and the page loads in about five seconds. It seems like once the page has finished loading, the CPU usage jumps to 100%, almost all of that httpd. A ton of processes get started, and they don't go away, and their CPU usage stays the same. I've changed the MaxRequestPerChild setting and so forth, but nothing seems to solve the problem. Even now, having not send any requests for about 15 minutes, the CPU usage is at 100%. Here's the applicable settings: Timeout 10 KeepAlive On MaxKeepAliveRequests 0 KeepAliveTimeout 3 <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 0 MaxSpareServers 2 MaxClients 20 MaxRequestsPerChild 50 </IfModule> I had always thought that once the request was made, Apache killed the process. Is there anything I can do to bring down the CPU usage, or is this just something I'll have to deal with? Thanks for helping out an Apache idiot.

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• Scaling databases with cheap SSD hard drives

  - by Dennis Kashkin

  Hey guys! I hope that many of you are working with high traffic database-driven websites, and chances are that your main scalability issues are in the database. I noticed a couple of things lately: Most large databases require a team of DBAs in order to scale. They constantly struggle with limitations of hard drives and end up with very expensive solutions (SANs or large RAIDs, frequent maintenance windows for defragging and repartitioning, etc.) The actual annual cost of maintaining such databases is in $100K-$1M range which is too steep for me :) Finally, we got several companies like Intel, Samsung, FusionIO, etc. that just started selling extremely fast yet affordable SSD hard drives based on SLC Flash technology. These drives are 100 times faster in random read/writes than the best spinning hard drives on the market (up to 50,000 random writes per second). Their seek time is pretty much zero, so the cost of random I/O is the same as sequential I/O, which is awesome for databases. These SSD drives cost around $10-$20 per gigabyte, and they are relatively small (64GB). So, there seems to be an opportunity to avoid the HUGE costs of scaling databases the traditional way by simply building a big enough RAID 5 array of SSD drives (which would cost only a few thousand dollars). Then we don't care if the database file is fragmented, and we can afford 100 times more disk writes per second without having to spread the database across 100 spindles. . Is anybody else interested in this? I've been testing a few SSD drives and can share my results. If anybody on this site has already solved their I/O bottleneck with SSDs, I would love to hear your war stories! PS. I know that there are plenty of expensive solutions out there that help with scalability, for example the time proven RAM-based SANs. I want to be clear that even $50K is too expensive for my project. I have to find a solution that costs no more than $10K and does not take much time to implement.

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• Local admin password recovery: Windows Vista

  - by Jim Dennis

  I am faced with an unsettling situation. A friend of my father's has rather suddenly become a widower. Naturally they've taken care of the bank accounts and all the normal mundane things that people have been doing for a century or so. However, she was the computer user of the household. He was aware that they had some online banking stuff and bill paying stuff ... and that she spent lots of time on FaceBook and stuff like that. However, he doesn't know what her local passwords were (actually only vaguely aware that her couple of desktop and couple of laptop system even had passwords). He's never heard of "admin" passwords so that's no good either. In the past I've used KNOPPIX and the old LinuxCare "bootable business card" to recover NT passwords. I've never done this with MS Windows Vista. So, I'm looking for the best advice on how to do this. Naturally I do have physical access to the systems (the two laptops are charging across the room from me; and her old desktop systems are, naturally, still back at his place). Getting it right is much more important than fast or easy (I don't want to mess up those filesystems and possibly lose some photos or other stuff that he or his kids or grandkids will want). (BTW: if anyone things this is some social engineering hack to play upon the sympathies of the community to get the information I'm asking for ... think about it for a minute. I know about IRC and the "warez" boards. I know I can find this stuff out there if I dig enough. I'm just asking here because it'll hopefully be faster and, secondarily to raise awareness. As more of us put more of our lives online ... as we get older and as places like FaceBook continue to widen the appeal of computing to a broader segment of older people ... we are, as computer nerds, going to see a lot more of this. Survivors will needs us to be careful, sensitive and ethically responsible as they try to recover those bits of legacy during their bereavement. I can now tell you, first hand, it sucks!)

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• List connections to OS X Server, and what sharepoint they have mounted?

  - by Dennis Wurster

  I have an Xserve running OS X Server 10.4.11. It has Apple File Protocol enabled to share a few dozen sharepoints on the local network. I would occasionally like to get a listing of who is currently connected to the server (easily done with Server Admin), but I would like to know which sharepoints they have mounted on their local computer.

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• How to step down voltage from 208V to 110V

  - by Eric Dennis

  I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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• Asus EEE PC 1005HA (XP Home) refuses to connect to Virgin Mobile MiFi

  - by Dennis Wurster

  My client has an Asus EEE PC model 1005HA, and we're attempting to connect it to the WiFi network created by a VirginMobile MiFi unit. They also have a MacBook Pro with Snow Leopard that has absolutely no issue connecting to the MiFi. The specific symptom is that the netbook fails to lease an IP address from the MiFi unit. I supply the 12-digit numerical password (WPA) to the netbook, it throws a 'waiting for network' dialog with an indeterminate progress indicator, and then times out. Update: We've determined that this behavior has stopped when the EEE PC and the MiFi unit were taken out of the client's home, and to a different home that didn't have an existing wifi network. Similarly, when taken to a third location that didn't have wifi, the EEE PC and MiFi got along swimmingly. My current theory is that the existing wifi networks and the wifi leg of the MiFi unit are on the same channel and competing with one another. Perhaps the MacBook Pro has the capability to overcome this interference, while the EEE PC doesn't.

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• Can't figure out how to make Slitaz USB persistent

  - by Dennis Hodapp

  I installed Slitaz on my USB. However I can't figure out how to make it persistent automatically. There are different sources telling me different ways to make it persistent. One told me to add "slitaz home=usb" to the syslinux.cfg file like this: append initrd=/boot/rootfs.gz rw root=/dev/null vga=normal autologin slitaz home=usb but it didn't work for me. http://www.slitaz.org/en/doc/handbook/liveusb.html gave an example of how to do it manually but I didn't try it and I also want it to happen automatically. custompc.co.uk/features/602451/make-any-pc-your-own-with-linux-on-a-usb-key.html is an older article that also explains how to make the USB persistent but I don't want to try it cause it looks outdated (from 2008) does anyone know the best way to make the USB automatically persistent?

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• SSH Tunneling for Munin

  - by Dennis Wisnia

  I had at home an NAS and in the datacenter a Server. I make an SSH Tunnel with the following command: autossh -fN -M20404 -R 1337:localhost:22 user@server (from the nas to the server) Its working and I can access the NAS. Now, I want access the munin-node, also I make a new tunnel from the server to the nas: ssh -N -R 49499:localhost:4949 localhost -p 1337 but if I make an nmap localhost -p 49499 the port is closed and i cant access the munin-node. I don't know why and I am very happy about your help.

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• Zabbix not getting data for one filesystem

  - by Dennis Williamson

  I have Zabbix monitoring disk space for several volumes on several servers. It works fine on all of them except for one of the volumes on one of the servers which always reports as 0. However, when I run ./zabbix_get -s localhost -p 10050 -k 'vfs.fs.size[/home, free]' locally on the machine in question, it gives me the correct, non-zero size which matches the output of df. How can I go about troubleshooting and correcting this problem?

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• Implications of Multiple JobTracker nodes in a Hadoop cluster?

  - by Jim Dennis

  I get the impression that one can, potentially, have multiple JobTracker nodes configured to share the same set of MR (TaskTracker) nodes. I know that, conventionally, all the nodes in a Hadoop cluster should have the same set of configuration files (conventionally under /etc/hadoop/conf/ --- at least for the Cloudera Distribution of Hadoop (CDH). Can we define multiple Job Trackers in mapred-site.xml? Something like: <configuration> <property> <name>mapred.job.tracker</name> <value>jt01.mydomain.not:8021</value> </property> <property> <name>mapred.job.tracker</name> <value>jt02.mydomain.not:8021</value> </property> ... </configuration> Or is there some other allowed syntax for this? What are the implications of doing this. Does each JobTracker get information about the load on each TaskTracker node. In other words can the two JobTracker co-ordinated their scheduling across the TT nodes only based on the gossip information from the TTs or would they need to talk to one another? Is this documented anywhere?

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• Are there any USB flash drives or SD cards which use RAID or redundant storage for additional reliability?

  - by Luke Dennis

  I'm looking to get a fault-tolerant USB flash drive, which saves data to multiple independent locations, whether using RAID or some other means to back up data. Has a product like this ever been created, or are my only options to hack something together? (By the way: I'm aware that RAID doesn't prevent data corruption from software or the file system. I'm just looking for something that can handle one of the memory sticks going dead.)

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• HP laptop won't recognize wireless adapter

  - by Dennis Williamson

  I have an HP Pavilion dv6400 series laptop with an NVidea chipset which is the subject of a class action lawsuit. The symptom (PDF) that I'm experiencing is that the system fails to recognize that there is a wireless adapter installed. It doesn't appear in Device Manager. Is there some way, short of installing a new adapter, that I can work around this problem? The system is running Windows Vista Home and has the latest BIOS (F42) and Windows updates and drivers. See this related question where I ask how to use an old Windows Mobile phone as a Wi-Fi (not cellular data) tether.

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• IIS7.5 is only resolving to the Default Web Site

  - by Dennis Burnham

  I am able to access only the Default Web Site on a Windows 2008 R2 Server which is running IIS 7.5 The Default Web Site's binding is to "All Unassigned", same way as I have done it on a different machine running IIS6 under Windows 2003 Server. The bindings of the desired Web Site have the IP address of the server and the correct home directory. Regardless what I do, the only page content I can see is the default index page in the wwwroot directory which is the Default Web Site. What must I do to deliver the correct content from the Web Sites that are configured in IIS7.5?

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• How to step down voltage from 208V to 110V

  - by Eric Dennis

  I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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• Ubuntu 11.04 fresh install - "Input signal out of range" or "Mode not supported..."

  - by Dennis

  I recently installed Ubuntu 11.04 using a CD .iso. Installation went fine. Upon completion I rebooted and after a second or two I got a black screen with the message "Input signal out of range". And there it sits... Read a few things about how this could be related to screen resolution, refresh rate, etc. For the heck of it I tried a different monitor. The result is the same but the message provides some clues - "Mode not supported - H:92.7kHz, V:58.3Hz" (the latter is Hz; not kHz). So my thought is that I should probably be able to use the 11.04 install disc to "Try out Ubuntu", find and edit some file that was created by the install with the correct values. Problem is, I am not too sure what I am supposed to edit. Looked at the xorg.conf file but this is so minimal at this point I am not sure it is where I want to go. By the way, the monitor is an I-Inc ix191a. Anyone have any ideas on how to get around this?

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• How can I make my laptop use a phone as a wi-fi adapter?

  - by Dennis Williamson

  I have an HP Pavilion dv6400 series laptop with an NVidea chipset which is the subject of a class action lawsuit. The symptom (PDF) that I'm experiencing is that the system fails to recognize that there is a wireless adapter installed. It doesn't appear in Device Manager. In this question, I ask if there's a way to work around this problem. As an alternative, I'd like to see if there's a way to use an old Windows Mobile 5 phone that does not have cellular service (voice or data) as a Wi-Fi adapter. How can this be accomplished? The system is running Windows Vista Home and has the latest BIOS (F42) and Windows updates and drivers.

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• Not getting my normal internet speed but my other computers can?

  - by Dennis

  I have Comcast Xfinity and I cannot reach anywhere near my promised speed. My family desktop which is hardwired into the router reaches to 60Mbps and so do my parents computers and my brothers. I cannot seem to get anywhere close to it, I know with being wireless I won't reach it, but I should at least get somewhere close. I can only pull 6Mbps and thats terrible for what I should be receiving. Any clue what could be wrong here? Edit: I have 100% signal and I'm not behind any walls

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• How to set up an extended desktop on dual monitors in Kubuntu 9.04?

  - by Dennis

  I'm using my laptop (Lenovo Thinkpad T60) and I have a secondary monitor (which has a different resolution than my laptop screen) connected by VGA. Kubuntu recognizes the monitor and it functions but my desktop is mirrored (i.e. an identical copy) across the dual monitors (which is useless to me). How can I extend my desktop across both monitors? P.S. I googled it but the solutions I found weren't standard, they were hardware specific and you had to manually change system files, etc.. There must be an easier way. edit: Here is a snapshot of the settings.

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• Why is CS never a topic of conversation of the layman? [closed]

  - by hydroparadise

  Granted, every profession has it's technicalities. If you are an MD, you better know the anatomy of the human body, and if you are astronomer, you better know your calculus. Yet, you don't have to know these more advance topics to know that smoking might give you lung cancer because of carcinogens or the moon revolves around the earth because of gravity (thank you Discovery Channel). There's sort of a common knowledge (at least in more developed countries) of these more advanced topics. With that said, why are things like recursive descent parsing, BNF, or Turing machines hardly ever mentioned outsided 3000 or 4000 level classes in a university setting or between colleagues? Even back in my days before college in my pursuit of knowledge on how computers work, these very important topics (IMHO) never seem to get the light of day. Many different sources and sites go into "What is a processor?" or "What is RAM?", or "What is an OS?". You might get lucky and discover something about programming languages and how they play a role in how applications are created, but nothing about the tools for creating the language itself. To extend this idea, Dennis Ritchie died shortly after Steve Jobs, yet Dennis Ritchie got very little press compared to Steve Jobs. So, the heart of my question: Does the public in general not care to hear about computer science topics that make the technology in their lives work, or does the computer science community not lend itself to the general public to close the knowledge gap? Am I wrong to think the general public has the same thirst for knowledge on how things work as I do? Please consider the question carefully before answering or vote closing please.

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• Installing Windows 7 on an Asus EeePC 1008HA

  - by Keith

  I'm planning to install Windows 7 on my Asus EeePC 1008HA netbook. I heard that there were some issues with RC1, but other than that have not had much luck finding help with this specific hardware. The closest I've found is this article for the similar 1005HA. I can find XP drivers and have them downloaded just in case. Also (obviously) I've backed up everything on the machine. Anyone on here got any experience with Windows 7 on an Asus EeePC 1008HA? Anyone know whether the reported issues with RC1 have been fixed by the RTM and driver updates?

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• Can VMWare Server 2.0 be useful in Production for easing backups?

  - by Keith Sirmons

  Howdy, Let's run this idea by the group here. I am thinking about using VMWare Server in production to host a 2008 Domain Controller with DHCP and DNS, a 2008 member server with WSUS, some virus software, and other "management" utilities a second 2008 member server with SQL, IIS, and File Shares for a medium business of 50-100 desktops. The reason I am leaning toward Server vs ESXi is for backup purposes. Using ESXi, if I want to backup the VM's, I would need a second server in the office with enough storage availability to hold a copy of the vmdks. I am wondering if putting this virtual environment on top of a basic 2008 server install will allow for easier backups to both tape and/or to offsite storage using JungleDisk. Can a snapshot be triggered easily via a scheduled job? I know this doesn't necessarily handle file level restores, but I want to make sure in a DR situation, we can restore production servers quickly. Does this concept hold water? Would a very minimum install of the 2008 Host remove too many resources from the actual production machines? This would be a new Dell 410 server with 12 GB ram and (6) 600 GB 15K in a RAID 6, Dual Intel Xeon 2.26GHz procs.

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• Multiple contacts with shared information

  - by Keith Thompson

  Background: I currently have several hundred contacts, synchronized between a Microsoft Exchange server and several mobile devices. I also save exported copies of the contacts in .vcf format. Is there a good way (application, file format, whatever) to maintain contacts with shared information? A very common scenario is that I have contacts for two or more people who live in the same house, for example: John Doe 123 Main Street, Anytown USA Home: 555-555-1111 Work: 555-555-2222 Mobile: 555-555-3333 E-mail: [email protected] Jane Doe 123 Main Street, Anytown USA Home: 555-555-1111 Work: 555-555-4444 Mobile: 555-555-5555 E-mail: [email protected] As you can see, both contacts have the same home address and phone number, but distinct names and work and mobile phone numbers. (Other information might also be either shared or distinct.) The applications and file formats I'm familiar with don't seem to have a good way to deal with this. If I use a single "John & Jane Doe" contact for both, it's difficult to distinguish the distinct information (if I want to call Jane's mobile phone rather than John's). If I use a separate contact for each, I have to remember to update both of them (or all of them for N 2) when they move or change their home phone number. An ideal solution would let me create a record containing information for their household, and have each of their contact records contain a reference to the household record, so that when I view John's contact record I see both shared and distinct information. Is there anything out there that has good support this kind of thing? (I would think there would be, since it's a very common scenario.) (I suppose I could roll my own system that generates merged .vcf files from some extended format, but that wouldn't play well with synchronizing across multiple devices.)

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• Exchange 2007 to 2010 public folder replication error 1129

  - by Keith

  I currently upgrading from an Exchange server 2007 to 2010. I have moved all mailboxes and OAB. I am having issues replicating the public folders. This is the error I'm getting in the event log on the 2007 box: Error 1129 occurred while processing a replication event. Folder: (6-11ED8367F0C) IPM_SUBTREE\Marketing\Marketing I have looked online and everything about these errors seems to relate from an old 2003 server. Well, we never had a 2003 server. I'm really not sure what to do at this point. Any help?

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• PDO - WHat is it? How do I enable it on shared hosting.

  - by Keith Groben

  I have a shared hosting account and PHP5 is installed and running. When I view phpinfo, I can see that mysql pdo is running. I think I need to "link" to it from the php.ini file. But I dont know for sure. I read that I needed to type "extension=pdo.so". I did that, and it did nothing. I contacted my hosting support, they said I need to rename php.ini to php5.ini. Did that and nothing. I am stuck and trying to install Kimai, but cannot without fixing this pdo problem. I have searched for a good hour and can find nothing to help me.

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• What's the simplest way to serve RhodeCode over HTTPS on windows?

  - by Keith Nicholas

  I have RhodeCode working with http using the paster serve tool that it comes with... I'm struggling to find a "simple" solution to get this running on HTTPS. A lot of discussion is about using Apache to do this on unix. Not a lot of info on how to do it on IIS. I was looking at paster serve and it seems to be able to serve using HTTPS, but can't quite work out how to get this going. However the real goal is just to serve RhodeCode over HTTPS in the simplest way possible ( all self contained would be brilliant).

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