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• Using multiple USB webcams in Linux

  - by rachelderp

  Running more than one USB webcam in Debian/Linux results in the the following error: libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON: No space left on device What initially seemed to be a programming issue in OpenCV turned into a quest for a mysterious hardware/software problem after the same errors were produced by running cheese and xawtv. Apparently it's caused by webcams requesting all the available bandwidth on the USB host controller. With that in mind I decided to run wireshark and capinfos to see just how much bandwidth a single camera used. 4 megabits per second at 320x240 14 megabits per second at 640x480 32 megabits per second at 1920x1080 Interesting! That might explain why two cameras at 320x240 work but any higher resolution fails. It's as if my USB controller is only operating at USB 1 speeds, yet lsusb shows both webcams belonging to a device which supposedly supports 480 megabits per second. One solution proposed forcing the webcams to calculate their bandwidth usage instead of requesting their maximum by running the following commands: sudo rmmod uvcvideo sudo modprobe uvcvideo quirks=128 Unfortunately that made no difference, so I decided to try another solution. A post on StackOverflow suggested telling my webcams to use a lower FPS or compressed video format like MJPEG, but after running v4lctl list it doesn't appear either of my webcams support changing their video mode. And that's where I'm stuck. Why would two webcams operating well below the maximum speed of USB 2 would produce this error? ps: It's not a disk space issue, df displays no change when the webcams are started. pps: If it makes a difference, here's the output of lsusb

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• Touchpad scroll slow and jumpy

  - by IR

  I have a laptop with a synaptics touchpad running on win7 x64. When i use the scrolling region of the touchpad in some applications, for example in Visual Studio 2008, Notepad and Windows Media Player 12, the scroll is very slow. If i pull the edge of the touchpad slowly the program will scroll one row at a time(regardless of the number of lines-settings in the mouse configuration). If i pull the edge quickly though, the program will instantly jump like 20 rows making it way too fast. In some applications, like Firefox, the scrolling work as expected. Changing the scrollspeed-setting for the touchpad does not help. If you make it slower it doesn't do the 20-row jump but then it's horribly slow and if you try to make it faster it will do the jumps all the time. I have tried both synaptics generic drivers and the "special" drivers that HP provides but they both have the same problem (except that the generic one can't adjust the scrolling speed, even though that didn't help anyway). With windows generic drivers the scrolling region doesn't even work. Other mice i've tried with scrollwheel work as they should do.

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• Advice on cloning disk

  - by hks

  I'm going to buy a second disk for backup, the same size as my laptops. I want to mount it in a casing via usb and backup an entire hdd every soemtime. That's because I want the posibility to just switch drives in case of something goes wrong. I'm using Linux and obviously the right tool seems to be dd. The thing is that my laptop drive has a speed of around 50-70 MB/s and usb 2.0 is 57 MB/s. So to copy my 250GB disk should take me more than 1 hour if I'm lucky. I can't wait this much. I want some differential backup. I read one of JWZ articles. In it he gives more details for using rsync on Mac. He writes that there is possibility of making rsync'ed disk bootable. So my question is: how to make rsync'ed hdd bootable under Linux or are there other 'quick backup' tools for Linux that would allow me to just swap drives? Or should I just stick to dd :( ?

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• 2.6.9 Kernel on virtual server (non upgradable) - any expected problems?

  - by chris_l

  Hi, I'm considering to rent a virtual server (for me personally). The product I'm currently looking at offers IMO fair pricing, very good hardware etc. The only problem is, that I won't be able to do an upgrade to a newer kernel than 2.6.9 (running Debian Etch). Also, I can't install my own kernel modules. (The server runs with Virtuozzo, so as far as I understand it, it just does some chroot instead of a real virtualization (?)) I want to run GlassFish, Postgres, Subversion, Trac and maybe some other things on it. It will also have to employ a firewall, and provide OpenSSL for https. Ideally, it would also be able to do AIO (asynchronous IO), which could speed up some server I/O. Should I expect problems with that old kernel version, in conjunction with the software I want to install (I'd like to use current versions of the software)? One thing I already found out, is that you can't do everything with iptables, since some kernel modules are missing/things are not build into the kernel. GlassFish v3 appears to run fine at first glance. I was able to test the server for a few hours. Installing my whole setup wasn't feasible in that time, but what I can say is, that it's amazingly fast for an entry-level vserver, especially hard disk and network performance (averaging at ca. 400MBit/s). So if the kernel won't be a problem, I'd really like to take it. Thanks, Chris PS Exact kernel version: 2.6.9-023stab051.3-smp

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• How can I create a macro that acts on a relative reference rather than an absolute reference to cell A1?

  - by Bruce

  I have a master rent statement in an Excel 2007 (macro enabled) spreadsheet that shows all tenants in rows with columns formed by the months. Each tenant then has a separate rent statement sheet like the one below that pulls the data through from the master rent statement and all I do then is to copy the last 4 columns to the right and add them to the right, just renaming the month labelled as ‘rent due’ with the current month and then hiding the previous last 4 columns to the left so that the statement always shows the previous month's activity and the amount due for the current month: I used a macro to speed up the creation of these statements, but then found that in some cases the result was wrong and needed major correction because the macro use absolute references i.e. its starting position was relative to cell A1 whereas some of my rent worksheets commence from a different column and in some cases from a different column and a different row. I have tried recording the macro with 'Use relative references' but when trying to use the macro it only gets part way through its operation before it stops and the message appears: Run time error '1004' Application defined or object defined error with the option to End or Debug or go to Help and then I'm stuck as I don't know how to debug and work in VBA or understand what has gone wrong. I want to record a single macro that always remains relative to the last 'Total Due' column heading (in the sample, it’s cell FF3 but on another worksheet could be cell GA26) and thus enables me regardless of where on the worksheet the rent statement is placed to add through my recorded macro a further four columns with updated dates and a repositioned 'Total Due' summary (in the sample in cells FE23 and FF23). The contents of cells FE23 and FE22 are always the same number of rows from the 'Sample Rent Statement, Service Charge and Sub Total' rows. I've searched on the web and in the help files of Excel 2007 but have been totally stumped by this, so currently I have to re-record a quantity of macros each month to cover all of the permutations of the worksheets in my Excel rent workbook, which is starting to become pointless in terms of saving time. Does someone know a solution to this problem please?!

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• Windows 7 misses keystrokes from internal keyboard after hibernation (on Acer Aspire 5820)

  - by ron

  I face a very strange symptom on my Acer Aspire laptop (with the factory default Win7 install and divers. Windows update running). After waking the computer from hibernation, it is a pain to type, since on average 5-10 keypresses are missing per 100 presses, using the laptop's keyboard. Steps to reproduce: 1) Power off 2) Power on, wait for system to become usable 3) Open notepad, for 5 times do hit 10x the same character. This gives a similar pattern of 50 chars total: xxxxxxxxxxyyyyyyyyyyaaaaaaaaaassssssssssdddddddddd 4) Optionally repeat. Everything is fine this far. 5) Hibernate. 6) Power on and resume. 7) Repeat steps 3)-4). This time approximately 3-5 character will be missing from each 50 characters. What I ruled out: putting to Sleep or just Locking and resuming from there does not cause problem battery / AC usage does not matter net connection does not matter running processes seem to be the same before and after hibernation key press speed doesn't really matter. For the test I use a nominal 3-5 strokes/second beat. plugging in an external USB keyboard works fine, but the built-in one still misbehaves What could be the problem? How could I diagnose if the keypresses arrive in, but get swallowed at some point? (maybe some nasty keyboard handler hook misbehaves?). Update: It seems that pushing the PowerSmart button and toggling to power saving state fixes the problem. Also, toggling it again back to the original state keeps it fixed. So this may be a fine workaround, but is not a conforming solution.

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• Ubuntu's garbage collection cron job for PHP sessions takes 25 minutes to run, why?

  - by Lamah

  Ubuntu has a cron job set up which looks for and deletes old PHP sessions: # Look for and purge old sessions every 30 minutes 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] \ && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 \ -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir \ fuser -s {} 2> /dev/null \; -delete My problem is that this process is taking a very long time to run, with lots of disk IO. Here's my CPU usage graph: The cleanup running is represented by the teal spikes. At the beginning of the period, PHP's cleanup jobs were scheduled at the default 09 and 39 minutes times. At 15:00 I removed the 39 minute time from cron, so a cleanup job twice the size runs half as often (you can see the peaks get twice as wide and half as frequent). Here are the corresponding graphs for IO time: And disk operations: At the peak where there were about 14,000 sessions active, the cleanup can be seen to run for a full 25 minutes, apparently using 100% of one core of the CPU and what seems to be 100% of the disk IO for the entire period. Why is it so resource intensive? An ls of the session directory /var/lib/php5 takes just a fraction of a second. So why does it take a full 25 minutes to trim old sessions? Is there anything I can do to speed this up? The filesystem for this device is currently ext4, running on Ubuntu Precise 12.04 64-bit. EDIT: I suspect that the load is due to the unusual process "fuser" (since I expect a simple rm to be a damn sight faster than the performance I'm seeing). I'm going to remove the use of fuser and see what happens.

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• Low 'Burst Rate' from SATA drive in HDTune?

  - by UpTheCreek

  I recently upgraded my laptop's v slow hard drive to a seagate momentus 7200. Everything is working fine, but I'm a bit confused by these benchmark results: The burst rate is significantly less than the Maximim transfer rate, and not much higher than the normal minimum (if you ignore the spikes). What's going on here? On the HDtune website it defines Burst Rate as: ...the highest speed (in megabytes per second) at which data can be transferred from the drive interface (IDE or SCSI for example) to the operating system. Which begs some questions... e.g. if this is the highest, then how did the bechmarking tool record the 103MB/sec maximum? And if this really is the true maximum, then where is the bottleneck? The laptops SATA interface is on an Intel 82801GBM southbridge controller. When I check in hardware manager, I see that it's driver is iaStor.sys from 2005. Maybe that's the issue? I'll look for a newever version, but any insights would be appreciated. Thanks UPDATE: Acorting to this page on the HDTune website... An important parameter of the test is the Burst Rate. This value should always be higher than the maximum transfer rate. A lower value is usually an indication of a configuration problem. So what might be the configuration problem?

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• environment variables generated by at command

  - by Jordan Arseno

  I'm inspecting /var/spool/cron/atjobs/a001cf01570e44 with cat, after running the at command from PHP using exec(). It looks like at has prepended the script with lots of APACHE environment variables. #!/bin/sh # atrun uid=33 gid=33 # mail www-data 0 umask 22 APACHE_RUN_DIR=/var/run/apache2; export APACHE_RUN_DIR APACHE_PID_FILE=/var/run/apache2.pid; export APACHE_PID_FILE PATH=/usr/local/bin:/usr/bin:/bin; export PATH APACHE_LOCK_DIR=/var/lock/apache2; export APACHE_LOCK_DIR LANG=C; export LANG APACHE_RUN_USER=www-data; export APACHE_RUN_USER APACHE_RUN_GROUP=www-data; export APACHE_RUN_GROUP APACHE_LOG_DIR=/var/log/apache2; export APACHE_LOG_DIR PWD=/home/jordanarseno/webroot/public_html/myapp; export PWD cd /home/jordanarseno/webroot/public\_html/myapp || { echo 'Execution directory inaccessible' >&2 exit 1 } curl -k http://localhost/myapp/crons/this_action/3 The last line is the only real command I sent along with at via stdin. What is the purpose of these variables? Where is this procedure stored?

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• Windows 7 misses keystrokes from internal keyboard after hibernation (on Acer Aspire 5820)

  - by ron

  I face a very strange symptom on my Acer Aspire laptop (with the factory default Win7 install and divers. Windows update running). After waking the computer from hibernation, it is a pain to type, since on average 5-10 keypresses are missing per 100 presses, using the laptop's keyboard. Steps to reproduce: 1) Power off 2) Power on, wait for system to become usable 3) Open notepad, for 5 times do hit 10x the same character. This gives a similar pattern of 50 chars total: xxxxxxxxxxyyyyyyyyyyaaaaaaaaaassssssssssdddddddddd 4) Optionally repeat. Everything is fine this far. 5) Hibernate. 6) Power on and resume. 7) Repeat steps 3)-4). This time approximately 3-5 character will be missing from each 50 characters. What I ruled out: putting to Sleep or just Locking and resuming from there does not cause problem battery / AC usage does not matter net connection does not matter running processes seem to be the same before and after hibernation key press speed doesn't really matter. For the test I use a nominal 3-5 strokes/second beat. plugging in an external USB keyboard works fine, but the built-in one still misbehaves What could be the problem? How could I diagnose if the keypresses arrive in, but get swallowed at some point? (maybe some nasty keyboard handler hook misbehaves?). Update: It seems that pushing the PowerSmart button and toggling to power saving state fixes the problem. Also, toggling it again back to the original state keeps it fixed. So this may be a fine workaround, but is not a conforming solution.

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• Which Cardbus/PCMCIA -> USB card works with external hard drive?

  - by Carl

  I have an HT-Link Cardbus/PCMCIA USB 2.0 2-port card (NEC / 32-bit). My external hard drive w/USB adapter won't work with it, and it will work plugged directly into a USB port on a different laptop. (My USB ports got fried.) I got the card off E-Bay. My MP3 player works plugged into that card. The drivers for the card say "Known limitations: High Speed Isochronus, USB Composite Devices." (No other details provided.) I don't know if the hard drive adapter is "isochronous" or "composite." I've read there are problems with too little power being supplied to the drive. The cable to the drive has two USB plugs on one end, and it doesn't make any difference if I plug both of them into the Cardbus card. What card should I get? I see many different brands on E-Bay. I need one that supplies sufficient power for an external hard drive, and doesn't have any "known limitations" in the way.

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• How can I change the default program installation directory in Windows 7?

  - by Max

  Windows 7 is installed on my C drive, which is quite small. I am very tired of instructing new programs to put their files on my larger D drive during installation; I would like to change the default drive. This article says that you can use a registry hack, but I am giving Microsoft the benefit of the doubt and naively assuming that a configuration option exists somewhere. It's 2010... do I really have to hack my registry to make a simple tweak like this? Also, there's a ServerFault question that explains how to move the "Users" directory and create a symlink, which could also work. However, at the moment I have some apps in C:\Program Files, some apps in C:\Program Files (x86), and some apps in the corresponding folders on D:\, so it would be a hassle. Also, my small OS boot drive is a 10k RPM WD Raptor, and I feel like that probably gives a speed boost to apps installed on it that need to read & write to their directories a bunch. I wonder if it actually matters.

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• Minecraft server hosting hardware specifications [on hold]

  - by Andrew Wright

  I am planning on purchasing a server to rent off Minecraft game servers, largely to friends. I am planning on purchasing a 128GB RAM server to save on colocation costs (as I am likely to need more than 32GB and would have to rent 2U of space...) I am hoping for some advice about the processing power needed to deal with this level of RAM. The servers will be run in a shared environment on linux in a VM to make backups easier. The server I have in mind is dual CPU. I have been considering at the low end dual Xeon E5-2609V2 Quad-Core 2.5Ghz, and at the high end dual Xeon E5-2650V2 Eight-Core 2.6Ghz. The difference between these is 6.4 GT/s and 8 GT/s and £3000 for the lower spec server, £4300 for the higher spec. I was hoping I could get advice about whether it is worth paying for the extra/higher speed processor or if I would be wasting my money? Thank you for any help - I appreciate that this is not directly related to professional system administration.

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• Using a degrading corrupted hard disk with a brand new one. Is this ok?

  - by EApubs

  My old 500 GB hard drive started to give bad sectors. Its slowly going down. So, I bought a new 1TB Seagate drive. I first attached the 500GB drive as the first primary drive and installed Windows. I want Windows boot loader to be placed in the old drive so it won't conflict with the Linux system. But the actual Windows system (Including the C drive) is placed on my new hard drive. After this, I attached the new drive as the primary and installed Linux. Now if I want to re install windows, I can do it without any issues by simply setting the old drive as the primary. So the Linux system will be untouched. But is it a good idea to set things like this? Will the old degrading drive have an impact on the new one? The old drive is slower than the new one. Won't I be able to get the maximum speed out of the new drive even when its used to install everything (including the OS)? PS : When I ran the Windows Experience Index, I was using the old drive as the primary. Did it got the hard drive ratings from the old drive? What if I run it now with the new drive as the primary?

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• Cannot Install Windows 7 SP1 (64-bit)

  - by Clever Human

  I have tried every way I know how to get Windows 7 SP1 to install. It fails every time. Below is what looks like the relevant contents of the CBS.Log file. If there are further details that would help or more information I can gather, I will get it. 2011-08-15 10:32:52, Info CBS Startup: Package: Package_for_KB976902~31bf3856ad364e35~amd64~~6.1.1.17514 completed startup processing, new state: Installed, original: Installed, targeted: Installed. hr = 0x80070490 2011-08-15 10:32:52, Info CBS WER: Generating failure report for package: Package_for_KB976932~31bf3856ad364e35~amd64~~6.1.1.17514, status: 0x80070490, failure source: CBS Other, start state: Partially Installed, target state: Installed, client id: SP Coordinater Engine 2011-08-15 10:32:52, Info CBS Failed to query DisableWerReporting flag. Assuming not set... [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND] 2011-08-15 10:32:52, Info CBS Failed to add %windir%\winsxs\pending.xml to WER report because it is missing. Continuing without it... 2011-08-15 10:32:52, Info CBS Failed to add %windir%\winsxs\pending.xml.bad to WER report because it is missing. Continuing without it... 2011-08-15 10:32:52, Info CBS SQM: Reporting package change completion for package: Package_for_KB976932~31bf3856ad364e35~amd64~~6.1.1.17514, current: Partially Installed, original: Partially Installed, target: Installed, status: 0x80070490, failure source: CBS Other, failure details: "(null)", client id: SP Coordinater Engine, initiated offline: False, execution sequence: 517, first merged sequence: 517 2011-08-15 10:32:52, Info CBS SQM: Upload requested for report: PackageChangeEnd_Package_for_KB976932~31bf3856ad364e35~amd64~~6.1.1.17514, session id: 101457924, sample type: Standard 2011-08-15 10:32:52, Info CBS SQM: Ignoring upload request because the sample type is not enabled: Standard I have downloaded the service pack and ran it from the EXE, I have installed it from Windows Update, I have ran all the "troubleshooting" trouble shots I could find. Nothing has worked so far. Any advice would be appreciated.

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• Windows XP VM on VMWare ESXi 4.1 "pausing" / blocked occasionally

  - by FelixD

  We have an issue with Windows XP SP3 VMs on VMWare ESXi 4.1.0 (the free version): They sometimes seem to "pause" for several minutes. This happens rarely (maybe once a month per VM, at least noticed only that often), but still is an issue for us. It happens for three different but similar VMs on three pretty different hosts (different hardware). I have the feeling that the "pausing" is not actually the CPU blocking, but probably the harddisks, but not 100% sure. The servers have one IDE disk (C:) and one SCSI (D:) and it might be either of the two. I have seen scheduled tasks simply not starting for up to 9 minutes and then running normally again with normal speed. They were totally blocked. This is not a load issue, the VMWare hosts have average load and the VMs in question already have reserved CPU resources plus high priorities for CPU and disk. The Windows boxes run mainly MySQL, Tomcat, FileZilla server, Cygwin stuff, Java + R applications, VMWare client, Elusiva Terminal Server pro, Nagios client. Not sure if this might be related with any of that software (e.g. Elusiva). Trying to debug this, there was nothing visible in Windows Event log, other logs in C:\Windows, VMWare events etc. Unfortunately the vmware.log file ends with "Log throttled". We found that we ran into 2 VMWare bugs there: The VMWare client writes lots on bogus messages in the vmware.log, which we now disabled (log level error setting) plus the bug that VMWare does not unthrottle the log (at least so far despite VM reboots). I know there is not much guidance and that may also be the reason why I so far didn't find anything related on the web or on ServerFault, but maybe some of this rings a bell with someone? Or please direct me to what more info to post. I hope that the vmware.logs get unthrottled eventually (can't easily restart the hosts at the moment). Thanks for any input!

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• MacMini transmit rate stuck at 11, every other device can connect at full 54Mbit/s?

  - by chum of chance

  I have a MacMini circa 2007 that's getting very low transmit rates via wifi, 8-11. I have other devices that are getting full 54, including a MacBook Air. With everything else off, the MacMini doesn't want to seem to go any faster. Since it has been previously connected to ethernet its entire life, I was wondering if there were some settings I can change to speed up the connection. Option-clicking the network icon gives this read out: PHY Mode: 802.11g Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -73 Transmit Rate: 11 My new MacBook Air has the following readout: PHY Mode: 802.11n Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -66 Transmit Rate: 79 Both have full bars and the wireless router is in the same room to eliminate any obstructions from the equation. Could the MacMini be connecting at an older protocol, like 802.11b and be reporting erroneously that it is connected at 802.11g? This would explain why I haven't seen a transmit rate above 11. Any further trouble shooting I can try before buying a new USB 802.11n device? The WiFi router is a DLink DIR-615. I can see other devices, and none, even the other g connected devices, are getting below 30-40 MBit/s. What's going on here?

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• Config nginx for slow connection to avoide corrupted doanlowds

  - by user1850273

  We have a Windows 2003 server that nginx 1.3.8 is running. Our problem is users with slow connction about 10K . Our server is serving our program update files and when they download from our server the downloade file is incompleted or crrupted. (Users can not download file with DL manager and the problem is in IE ) for example in slow connection a file with 25mb , after 2Mb downloaded finish . in high speed connections there is no problem. Also when we redirect these slow connection to other port F.e 50005 with the same config they download will be much better but not good as other servers. Which config we must apply to avoide such these download stops or corrupted downloads in slow connection ? this is our server config : worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent ' '"$http_user_agent"'; access_log logs/access.log main; sendfile off; keepalive_timeout 60; server { listen 80; server_name localhost; location / { root html; deny 127.0.0.3; index index.html index.htm; } } server_tokens off; } Our server use Htaccess password accounting and we can not use IIS on windows , Which soloution you think is better ? IIS with a extention to use apache htaccess ? Or use apache for windows insted of nginx ? Thank You.

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• AT&T Upload Filtering?

  - by xpda

  Using an AT&T DSL, I cannot ftp upload or ftp download a few files of a large 1500 set. The problem is the file name. I can change a few characters of the file name, and they upload fine. I can change the filenames from upper to lower case and they upload fine. If I change back to the original filename, it will not upload again. When it doesn't upload, it starts, transfers about 5% of a 5-10 meg file, and then times out. I have uploaded one of the files under a different name, changed the name back to the original, and it will not download via ftp. It will download onto a browser, and it will ftp download just fine with a different name. It just will not download with ftp. I have reproduced this uploading to three different servers on 1and1 and Amazon EC2. When I try it on a non-AT&T ISP client, it works OK. Here is a file that did not upload until I had renamed it. (I have changed it back to the original name): "http://xpda.com/nautnew/11302 STOVER POINT TO PORT BROWNSVILLE SIDE A.png" This problem is unrelated to connection, speed, and file content. Only things I can see that makes a difference are the file name and ATT DSL. Does ATT have some kind of ftp file filtering? Is there anything else that could cause this behavior?

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• 5 year old server upgrade

  - by rizzo0917

  I am looking to upgrade a server for a web app. Currently the application is running very sluggish. We've made some adjustments to mysql (that's another issue in itself) and made some adjustments so that heaviest quires get run on a copy of the database on another server was have as a backup, however this will not last that much longer and we are looking to upgrade. Currently the servers CPUs are (4) Intel(R) XEON(TM) CPU 2.00GHz, with 1 gig of ram. The database is 442.5 MiB, with about 1,743,808 records. There are two parts of the program, the one, side a, inserts and updates most of the data. Side b, reads the data and does some minor updates. Currently our biggest day for side a are 800 users (of 40,000 users all year) imputing the system. And our Side b is currently unknown, however we have a total of 1000 clients. The system is most likely going to cap out at 5000 side b clients, with about a year 300,000 side a users. The current database is 5 years old, so we can most likely expect the database to grow pretty rapidly, possibly double each year (which we can most likely archive older records if it comes to that). So with that being said, should we get a server for each side of the app, side a being the master, side b being the slave, any updates made on side b are router to side a. So the question is should i get 2 of these or 1. 2 x Intel Nehalem Xeon E5520 2.26Ghz (8 Cores) 12GB DDRIII Memory 500GB SATAII HDD 100Mbps Port Speed And Naturally I would need to have a redundant backup so it could potentially be 4 of them.

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• VMware ESX Linux Guest Customization

  - by andyh_ky

  Hello, I am interested in deploying several RHEL 4 Update 8 virtual machines for creation of a test environment. Here are the steps I am taking: In off hours, P2V/V2V the production machines and convert them to templates Deploy the virtual machines with a customization specification that changes hostname, IP address I am interested in how these processes are done and if there are any options for further customization. Are the machines brought on the network when they are powered on, before they are reconfigured? Is there a potential IP address conflict? Is there an option to run additional scripts which reside on the guest as a part of the reconfiguration? For example, restoring an Oracle Database. This is an option with Windows guests and sysprep, but I have been unable to locate anything showing a RHEL equivalent. I am dealing with a multi tier application. The main issue I am attempting to mitigate is that the application servers reference database servers by hostname and in tnsnames files. I am interested in scripting the reconfiguration of the application in the deployment so that the app/db servers are pointing to the test environment. I am OK with placing the 'cleanup' script on the source and executing it after the machine has been brought up. I am interested in the automation of the script's execution post clone/boot, as well as if there could be an IP address conflict. (cross posted to VMTN's ESX 4 community)

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• Need recommendation: which USB card (PCMCIA) works with external hard drive?

  - by Carl

  I have an HT-Link Cardbus/PCMCIA USB 2.0 2-port card (NEC / 32-bit). My external hard drive w/USB adapter won't work with it, and it will work plugged directly into a USB port on a different laptop. (My USB ports got fried.) I got the card off E-Bay. My MP3 player works plugged into that card. The drivers for the card say "Known limitations: High Speed Isochronus, USB Composite Devices." (No other details provided.) I don't know if the hard drive adapter is "isochronous" or "composite." I've read there are problems with too little power being supplied to the drive. The cable to the drive has two USB plugs on one end, and it doesn't make any difference if I plug both of them into the Cardbus card. What card should I get? I see many different brands on E-Bay. I need one that supplies sufficient power for an external hard drive, and doesn't have any "known limitations" in the way.

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• Combine multiple network interfaces to connect to a dedicated server

  - by Dženis Macanovic

  this is an underpaid employee writing, who's apparently responsible for all the IT stuff in a very small (non-IT) company. Today said company got a bunch of PCs/workstations, a switch, a computer that's supposed to be used as a router, two DSL connections (each 16 MBit/s downstream and 1 MBit/s upstream) and a dedicated server which is hosted and managed professionally by a larger local company with some decent connection speed (1 GBit/s both directions if I'm not mistaken). This is what I've set up (note I'm not making use of the second DSL connection at all)... ETH0 ETH1 [ SWITCH ]---[LINUX DEBIAN ROUTER]---[DSL MODEM 1]---[INTERNET] | | | PC1 | | PC2 | ... ... when my boss asked me, if it was somehow possible to get 32 MBit/s downstream and 2 MBit/s upstream. At that time I replied "no" without thinking too much about it. Now I've just had the following idea... ETH1 ETH0 ETH0 ,---[DSL MODEM 1 (NON-STATIC IP)]---, ,---, ETH0 [ SWITCH ]---[LINUX DEBIAN ROUTER] [INTERNET] [LINUX DEBIAN SERVER]---[INTERNET] | | | '---[ DSL MODEM 2 (STATIC IP) ]---' '---' PC1 | | ETH2 ETH0 PC2 | ... ... but I have absolutely no clue how to implement that. Would that even be possible? What would the masquerading rules look like on the router? What about the server? I didn't find anything on the internet, mainly because I couldn't come up with any good keywords to search for to begin with. English obviously isn't my first language. Thanks in advance for your time!

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• Online FTP or file sharing service [on hold]

  - by Frede

  We need to share large files with clients, e.g. clients upload a large file, we modify it and later make it available for download. Up until now we've used FTP but this has a number of drawbacks. A lot of management of files and setting up accounts etc. We are therefore considering online alternatives. Requirements: Cheap, 8-) Easy to use, ideally just requiring a web browser, but also possible for power users to connect e.g. via FTPS/SFTP No registration requried for users to upload/download files. We ourselves of course need to be able to login an view uploaded files and upload new files. No per user fee High bandwidth. As files may be GBs in size both upload and download speed cannot be too slow Secure. Encryption during upload/download. No way for users to access uploaded files. Once a user has uploaded a file they (or anyone else besides us) should be able to access the file. To download files users get a link with a password. Ideally the link expires after a set time. No software installation We do NOT need any sync features, backup, versioning etc. Just a quick, easy, secure way for us to share files with our clients. Services like JustCloud, DriveHQ etc seems bloated and "too much" for what we need. What other alternatives exist? Thanks!

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• Is a modem required to be programmed when using with an internet provider?

  - by Tim

  I wonder if a modem is required to be programmed when using with an internet provider? If yes, what is the purpose of programming a modem? Do both a DSL and a cable ISP both require a modem to be used in an individual home? For example, I have a Motorola modem SURFboard Model:SB5101, Customer S/N: xxx S/N? xxx HFC MAC ID: xxx USB CPE MAC ID: xxx a coil of cable and a splitter from Comcast High-Speed internet Self-Installation Kit, which were bought 5 years ago, when I purchased Comcast internet service from its retailer www.comcastoffers.com. With them, I was hoping to reduce the amount of fee by avoiding to ask Comcast people to come over to install. But I remember at that time Comcast sent its technician here, dismissed my idea of self-installation, saying they needed to use their own modem and charging me a hefty fee, and so my equipments have never been used. I haven't been using Comcast for a long time. I wonder if my modem, cable and splitter (brand new, never used) are still good to use with an internet provider such as Comcast? If needed, we can ignore their policy and just consider the technology side? Or they are not good to use and I must throw them away like trash? Thanks and regards!

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