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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• Fusion 3.1 and Parallels 6 for Win7 x64

  - by Ronnie

  I read in a recent article that Parallels Desktop 6 is faster almost everywhere than VMware Fusion. I was originally using Parallels 4 before passing to VMware due to the frequent Parallels crashes. As now I am using a lot Fusion on my Macbook on a big Win7 x64 virtualized development machine that I find too slow I am wondering if the announced speed up of Parallels V6 is justified to come back to it. As a test I converted my Fusion 3.1 to a trial of Parallels Desktop 6 and my Windows Experience Index passed from 4.7 of Fusion to 4.5 on Parallels 6 so apparently the virtualized machine is not seeing that speed benefit. Is there any optimization to set up on Parallels to increase the WEI or should I stay with Fusion (and in this case this kind of articles is just marketing stuff)?

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• Palm software that can turn the Palm IR keyboard into a Bluetooth keyboard for PC?

  - by Stu

  I had this kooky idea this morning. I love my foldout palm keyboard, but it only speaks IR to my Palm Treo. But it also has a Bluetooth radio so I thought wouldn't it be just keen to have a program that runs on the Treo that reads from the IR the keyboard and exposes it as a Bluetooth keyboard for a PC. I realize I'm way late to the game because there's so little information about the Palm anymore. I was thinking of writing this software if it wasn't too big of a deal, but I figured I'd see if anybody knew of such a project already in existence or something like it that I could piggyback off of. Not even sure if I can get the Palm OS Developers' kit anymore....

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• Unable to Boot from USB External Hard Drive

  - by Josh Stodola

  I recently upgraded my main development machine to Windows 7. This involved wiping out my primary boot drive (Windows XP 64-bit) and starting clean. Before I wiped it, I did a direct disk-to-disk copy to a big external hard drive I have. While I have been able to migrate most of the necessary files without any problems, I was wanting to boot from it today to check a few settings. I plugged in the hard drive, rebooted, changed the BIOS to boot from USB-HDD first. But, no mattter what I do, it always boots from my primary drive to Windows 7. I do not see any kind of error message or anything. How can I boot to Windows XP 64-bit on this external hard drive?

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• Strip X Window System from OpenRD (Fedora core 8)

  - by disown

  I just got myself an OpenRD Client embedded box with an old Fedora 8 on it. Runs like a charm, only problem is that the default install has X on it, which I would like to remove in order to free up some space. I found a similar post here on the same topic, but yum groupremove doesn't work in my case, yum grouplist returns nothing, so I presume that no groups are defined. I don't know if this is because fedora 8 didn't have any groups, or because the OpenRD build is special in some way. In any case, I would like some tips on which package(s) to remove in order to remove an as big chunk of X as possible. Thanks in advance.

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• Rail's FileStore with Linux Disk Caching or RAMdisk?

  - by Yo Ludke

  I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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• Revo 3610 not doing hdmi handshake

  - by DoomStone

  I am having a problem with my Revo 3610 witch is connected to my tv via hdmi. For some reason will it not do the hdmi handshake with the tv, so my tv does not think that there are anything in the hdmi port. I have tested the tv and it works find, with my laptop and dvd. It dose work some times, but this time have it failed for 2 days in a row, and i have tried rebooting, turning the tv off and on, and so on nothing helps. I can trick the TV to listen to the HDMI with connecting with my laptop and then change the hdmi back to my revo, this on the other hand results in the image going thoug nicely but there are a big fat "Check signal cable." on the screen. I have also tryed changing the resolution in the revo but this dose not help ether. Have any one had this problem before, and if so how did you fix it? Example: http://i.imgur.com/gguZ4.jpg

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• In Excel, given a worksheet "A", how do you create a sheet "B" that has a subset of the rows in "A"?

  - by user32706

  In Excel 2007, I have a sheet full of data "A". One of the columns in sheet "B" is called "Valid" and has either "yes" or "no". I've created a second sheet "B". It's easy to make each row in "A" appear in "B" if the row is valid using an 'if' statement in each cell. But if it's invalid, there's a blank row. I need "B" to show only the rows from "A" that are valid. TWO BIG CAVEATS: - No macros - No filtering (for long and complicated reasons). I feel like it might be possible with vlookup used cleverly, but so far, I'm stumped.

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• Unix: Sync directory with FTP or SFTP directory

  - by Svish

  I have a website on my local computer running Mac OS X. I am wondering if there is any built-in command that I can run in the Terminal that will upload that website to my webserver either through FTP or, if possible, SFTP. Installing new commands through MacPorts is also a possibility. A big bonus would be that it only uploaded the files that needs to be updated and not everything else. It would also be nice if I can tell it to delete the files on the server that no longer exists locally once in a while. Any good tips?

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• Postfix sends email to spam (gmail, hotmail)

  - by razorxan

  I recently installed a postfix + dovecot + dkim multi domain, multi user, multi alias mail server on my debian squeeze system. Everything works except for one big issue that basically makes the whole thing useless: Every single email sent by my server goes straight into spam. (gmail, hotmail) First thing i did is doing the well known allaboutspam test and all is checked (green) except for the BATV thing (yellow): Reverse dns: green HELO Greeting: green RBL: green BATV: yellow SPF: green DKIM: green URIBL: green SPAMAssassin: green Greylist: green I'm really confused and i can't see a way to solve this issue. Ask me any detail if you need.

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• How to determine which source files are required for an Eclipse run configuration

  - by isme

  When writing code in an Eclipse project, I'm usually quite messy and undisciplined in how I create and organize my classes, at least in the early hacky and experimental stages. In particular, I create more than one class with a main method for testing different ideas that share most of the same classes. If I come up with something like a useful app, I can export it to a runnable jar so I can share it with friends. But this simply packs up the whole project, which can become several megabytes big if I'm relying on large library such as httpclient. Also, if I decide to refactor my lump of code into several projects once I work out what works, and I can't remember which source files are used in a particular run configuration, all I can do it copy the main class to a new project and then keep copying missing types till the new project compiles. Is there a way in Eclipse to determine which classes are actually used in a particular run configuration?

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• Limit disk I/O one program creates?

  - by Posipiet

  Hardware: one virtualization server. Dual Nehalem, 24GB RAM, 2 TB mirrored HD. Software: Debian, KVM, virt-manager on the server with several virtual machines that use Linux too. 2 TB Disk is a big LVM, each VM gets a logical volume and makes its own partitions in that. Problem: One of the programs that runs on one of the VMs creates huge disk load. This never was an issue, because the program never ran on such a powerful hardware. Now the CPUs are fast, and lots of I/O is the result. We cant do much against that at the moment, because the tool is a black box. On the other hand, the speedy computation is welcome. The program creates about 5 GB of temp files which get overwritten during the next iteration. Question: How can we limit the disk I/O for the process?

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• MySQL keeps crashing OS server.. Please help adjust my.ini!

  - by TruMan1

  I have MySQL 5.0 installed on a Windows 2008 machine (3GB RAM). My server crashes on a regular basis (almost once a day) with this error: Changed limits: max_open_files: 2048 max_connections: 800 table_cache: 619 I did not use the heavy InnoDB .ini file, although I am rethinking that I should have? I am worried that big configuration changes will make my current sites stop working. What should I do? Here is my current ini settings: default-character-set=latin1 default-storage-engine=INNODB max_connections=800 query_cache_size=84M table_cache=1520 tmp_table_size=30M thread_cache_size=38 myisam_max_sort_file_size=100G myisam_sort_buffer_size=30M key_buffer_size=129M read_buffer_size=64K read_rnd_buffer_size=256K sort_buffer_size=256K innodb_additional_mem_pool_size=6M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=3M innodb_buffer_pool_size=250M innodb_log_file_size=50M innodb_thread_concurrency=10

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• wifi routers and concurrent devices

  - by Joelio

  We have a Linksys WRT54G WiFi router in our office which was working great when we had 5-6 folks. Now on peak days we have 10-15 people, each with a computer, smartphone, etc, and an ooma VOIP device. On average 1-2 times a day I need to go hard reboot the router, and sometimes the border router (Cox-supplied device). I assume this is just because the router cant handle this many concurrent users. So my question is can these consumer routers handle this kind of load? If not, would adding more devices solve the problem, and how close proximity can I put 2 routers without having interference problems (our office area is not that big physically)?

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• How can I receive more traffic? My VPS fails!!!

  - by qtrix

  I have a web site - photo gallery. About 400 photos. Site on Gallery 3. mySQL. Hosted on VPS from myhosting.com (CPU 1792 MHz, 2048 MB RAM). Everything seems to be ok, but there is one big problem. Once traffic reaches ~ 20 people (online) - website start loading really really slow. Actually website can't be loaded about 30-60 sec. What should I do? Buy more RAM / CPU on the same VPS? Move to a dedicated server or maybe myhosting.com just sucks? What do you recommend?

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• Which CMS for a mobile app? No HTML, just XML or JSON.

  - by Sascha

  I am a newbie in content management systems. I would need a CMS that can transfer content by XML or JSON to a client. It is ok if the CMS can also manage HTML websites, but the priority is on the data transfer over a web service. Which is the best CMS to use here? I want to avoid spending endless hours learning all the big CMS systems just to find out that they don't support this feature or that it's badly integrated. Thanks.

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• FTP Sites vs Sites in IIS 7.0

  - by NealWalters

  We have one FTP site set up (and working) basically like the instructions here: http://www.iis.net/learn/publish/using-the-ftp-service/creating-a-new-ftp-site-in-iis-7 It shows up under "Sites" and then the name of our FTP Site. However, above "Sites" (in the left navigation tree view), we see a node called "FTP Sites". When we click on it, it says "FTP Management is provided by IIS 6.0". Can someone give me the big picture of why this node appears, and why IIS 6 is involved? Is is some backward compatible feature? I didn't build these machines, so don't know the reasoning of what was done before I arrived on the scene. Also, is the tree view icon for websites and FTP sites the same?

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• redundant/multi-site terminal server

  - by Adam

  Hi We have a Hyper-V cluster running 5 virtual terminal servers using HA. We need to be able make this system redundant and so if this site was to fail our users could log into the backup system at another location and access their data via the terminal servers. Any ideas? We were thinking of maybe using a NAS which replicated the data to the other location in real-time(pass-through disks)? and having a similar Hyper-V cluster setup in the backup location. However we would need to create the users in both location and create a virtual mirror without the data ie applications, directories, settings etc. Is this the best way to achieve this? We have read that using Hyper-v pass through disks is a big performance de-grade.

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• How does Outlook handle old recurring reminders?

  - by Zian Choy

  Context: Windows 7 Ultimate 32-bit edition Microsoft Office 2007 Outlook Steps to Reproduce: Make an event that recurs once a week. Wait a week. See that it pops up OK. Wait a month. Notice that it doesn't say that it is a month overdue. Expected Result: The usual note that the reminder is [x] weeks overdue. Actual Result: Something like "6 days overdue". Possible Excaberating Issue: I have many overdue reminders. For the ones that aren't time critical (and all other things being equal), I work by category and age. For example, I do health-related reminders when I'm doing health stuff; if I have 2 health-related reminders, I do the older one first. Big Question: How is Outlook supposed to handle this sort of overdue recurring reminder? Is there any way to get Outlook to act the way I expect it to?

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• How can I receive more traffic? My VPS fails!!!

  - by Vic

  I have a web site - photo gallery. About 400 photos. Site on Gallery 3. mySQL. Hosted on VPS from myhosting.com (CPU 1792 MHz, 2048 MB RAM). Everything seems to be ok, but there is one big problem. Once traffic reaches ~ 20 people (online) - website start loading really really slow. Actually website can't be loaded about 30-60 sec. What should I do? Buy more RAM / CPU on the same VPS? Move to a dedicated server or maybe myhosting.com just sucks? What do you recommend?

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• How to configure mysqldump to avoid max_allowed_packet error

  - by Leopd

  Honestly it baffles me that with a completely default installation of mysql if I run mysqldump with default parameters it generates a SQL file that can't be imported into another completely default installation of mysql. From what I can gather it's got something to do with the max_allowed_packet setting and/or the net_buffer_length setting. I've read a bunch about this, and tried tweaking it a bunch of ways on both the export and import sides, but it still doesn't work. I keep getting the packet too big error on import. From everything I've read, here's my best guess: mysqldump --net_buffer_length=50000 myschema > giant_file.sql Because I read here that mysqldump refers to max_allowed_packet as net_buffer_length because ... uhh ... anyway. Then to import mysql --max_allowed_packet=999999 myschema < giant_file.sql But this still doesn't work. How do I export / import the database???

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• SQL Server Transaction Log RAID

  - by Eric Maibach

  We have three SQL Server servers, and each server has a about five or six databases on it. We are in the process of moving these servers to a new SAN and I am working on the best RAID configuration. Currently all of the log files for all of the databases share a RAID array, there is nothing else on this RAID array except for the log files, but all of the databases use this same array for their log files. I have read that it is best to have log files on separate disks. But in our case I am not sure whether it would be best to have one big array with about 8 drives that all the log files are on. Or would it be better to create four two disk arrays and give some of the larger databases their own dedicated disks for their log files?

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• AirPlay over unicast DNS-SD. Anyone got it working?

  - by Moduspwnens

  We set up AirPrint using unicast DNS-SD on our campus about a year ago and it turned out to be a big success, so we're looking at trying to get AirPlay working so our faculty and students can wirelessly show content on our classroom projectors. There are still a couple of other things preventing an ideal implementation (username and password authentication, for starters), but I've been trying to set up a working demo nonetheless. Getting AirPrint working was basically just a matter of advertising the same records over a DNS-SD domain instead of the multicast (.local) one, but doing the same thing for AirPlay doesn't seem to cut it. The devices don't recognize the DNS-SD AirPlay servers as available. I've uploaded a screenshot of my DNS-SD configuration with the original (from AirServer, which works normally for multicast) here. I realize this is still a fairly new feature and documentation is lacking, but has anyone been able to get AirPlay working via DNS-SD? If it simply only works over multicast, I can accept that, but its potential is so appealing for us that I thought it'd be worth asking if anyone else has figured it out.

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• Using a PC + headset as a telephone without VOIP

  - by user76782

  I'm trying to find a way to realize a decentralized callcenter, so that the callcenter agents can talk from their home office with just a PC + headset. The big challange is that some of the agents have very low bandwith and the quality with VOIP is too bad. So my question is: What other solutions are possible when VOIP is not a option? What exactly do I need to do if I try to achieve this with for example Landline/PBX or GSM? (e.g. Which software do I need to install? Which device do I need?)

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• Is there a free ftp client that has macros

  - by wheresrhys

  At the moment I'm using filezilla to deploy new versions of a site to the live server. the trouble is that there are one or two config, bootstrap etc. files which are different for the live site and I have to be careful not to overwrite. Also there are big areas of code that never change (eg I use the zend framework, which is always the same). I'd like to be able to record a macro to upload the same bunch of files and folders every time, excluding subdirectories and files which shouldn't be overwritten. Does any ftp client offer this?

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