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• How can I pin point a USB file transfer bottleneck in Unix?

  - by HankHendrix

  I'm experiencing very slow data transfer speeds over USB 2.0 on my nix box and was wondering how I can pin-point the cause of the problem. I've looked into iotop and top but the cpu and mem figures look normal (compared to guides I have checked). The box which is affected is Ubuntu 12.04 32bit Server running on an Asus EEE 701 2G model and I am transferring from the OS over USB 2.0 to an external HDD (which transfers at 30MB/s+ on Windows 7 on other machine). I get rsync write speeds of 1MB/s from OS to USB HDD which seems ridiculously slow. These speeds are consistent with other USB HDDs and sticks.

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• Problems with the backup

  - by marcodv

  I did a script which run around 4 o'clock in the morning, for backup all the mysql databases and the config file for 250 linux vm. The problem is that it tooks ages for complete and more than 50% of these vm, need more than 8 hours for complete. More or less all the vm had the same configuration,I mean Same amount of ram same amount of disk space same number of cpu Debian 6.0.5 I am saving these backup on amazon s3, because is the cheapest solutions that I've found. Now my questions is: Has anyone some solutions or suggestions about that? On one blog I've read that probably the ionice and nice combination could be good work around about that. any thought?

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• Why does Resource Monitor in windows 7 show half my memory as "Hardware Reserved"?

  - by Brandon

  Does anyone know why in Windows 7 Resource Monitor shows that I have 8 GB of RAM installed on my computer, but I only have 3.2 GB available as 4.8 GB are in "Hardware Reserve". I researched this issue and tried going into msconfig and making sure that in the boot options the number of processors and max memory options were turned off. I also opened the computer up and reseated each of the memory sticks while clearing out any dust that was in there. Some info on the system I am using: OS: Windows 7 Enterprise 64-bit Edition CPU: AMD Phenom X4 9750 Memory: 4 X 2GB DDR2 memory Motherboard: MS-7548 (Aspen) Any help would be much appreciated.

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• I know this is a stupid question but... How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• Passenger/Rails not releasing memory

  - by michaeldelorenzo

  I have an Ubuntu server running three separate Rails (2.3.8) applications with Passenger, REE and Apache. Recently we started experiencing problems with ruby processes eating up memory and consuming entire cores on our server. Here's what we're getting... %CPU PID USER COMMAND 99.9 1717 nobody Rails: /var/www/api 99.6 5542 nobody Rails: /var/www/api 97.3 1223 nobody Rails: /var/www/api 4.7 5537 nobody Passenger ApplicationSpawner: /var/www/api 10.5 1801 nobody Rails: /var/www/api We've also seen instances where there have been over 100 instances of Apache running. These applications have been running for a few months without an of these issues, but in the last day or so we've been noticing this. The site referenced here is a Rails application that is a RESTful API so it serves many requests every minute. Any guidance on what we should be checking or looking out for would be appreciated.

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• transparently set up Windows 7 as remote workstation

  - by Áxel

  Maybe is a very basic question, but I can't find the exact terms to Google for it and find the concrete answer to my doubt. Suppose we have several PCs in which individual employees work. One of them has an extremely powerful CPU, and it's very useful to use that computer to perform heavy computations, but go there and set up your task means its user has to stop working for a while. Is it possible to allow a secondary user account to remotly log in, for example via Remote Desktop, and work with a full user environment, while the main user keeps working under his user session? I've used remote desktop many times in the past, but it always blocked current user session, or even terminated it. Lots of thanks in advance guys.

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• Linux freezes every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• aptana/eclipse blocks other apps

  - by waquner

  Hi, I've got a fresh win7 installation, the only apps installed so far are aptana (beta 3)/eclipse and firefox + chrome (except antivirus and drivers) Every time I start aptana, chrome and firefox are blocked, so firefox can't load a webpage (or sometimes takes veeeery long) and chrome doesn't even take care of events (so for example hovering over a link doesn't change the cursor and a click does...nothing or typing in an url, press enter - nothing happens) First I thought, aptana downloads something and blocks my internet connection... but IE works well and also there are no signs in the taskmanager (cpu%, network or memory) When I close Aptana, all works as before. I tried updating Java, which didn't help... On my office-computer I use the same apps and it works perfect. Got any ideas? TIA, waquner

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• How to get rid of disturbance on LCD monitor?

  - by Uday Kanth

  I have an Acer G195HQL LCD monitor and recently I've been noticing a lot of disturbance on the screen. They appear to be like flickering horizontal white lines. These lines are more apparent on dark backgrounds like grey/black. The curious thing is that, the intensity of these lines increases and decreases with no specific pattern. The disturbance temporarily goes away when I detach and re-attach the VGA cable at the CPU end. My speakers are magnetically shielded, but the problem persists even when I turn them off. I don't know what to do and this is really annoying me. Is it possible that my monitor is failing? Or is there anything I should check?

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• PSU aka Power Supply won't turn off and No Power_Good - Safe to keep using?

  - by Tek

  The title is the symptoms of my problem. I mainly chose this title for search engines so people can know why this is happening since I see a lot of uncertainty when it comes to this problem. I do have a question related to the source of the problem though. First of all, Inserting the power to the power supply automatically turns on my computer. Using a power supply tester, the tester automatically turns on without me having to push the button to test the PSU. lol. The PG (Power Good) signal is missing. The strange thing is my computer still turns on (OS boots, etc) considering a missing power good signal. Is it really that unsafe to use the power supply when it's missing the power good signal? All the voltages seem to be in check. Here's a picture: Power Supply Tester Readout And by safe (considering the readout) in the sense that is it likely my components (cpu, mobo, etc) could be damaged?

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• Windows 7 extremely long startup

  - by Tyler

  Windows 7 before it even gets to login. On the "starting windows" splash screen takes no less than 15 minutes to finish more like 25 minutes most times. During this time the hard drive activity led indicator is blinking maybe once every 20 seconds. When I finally get to the desktop everything runs normally. I have unplugged all peripherals with same result. Ideas? It's 32bit. 4gig memory. Fast CPU which I can't recall off the top of my head.

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• Server OS: put it on a separate drive? Yes, no, or depends on the situation?

  - by captainentropy

  Hi, I would like opinions, or facts, both preferably, on whether it's ok to install a server's OS on the RAID array or not. I would predict installation on separate drives is the best but I'm interested in the performance. The server in question will have 8 cores (2.4GHz ea.), 24GB RAM, and ~16TB of usable space of server-class drives in RAID10. There is also a subsytem of an ~equivalent size for backup. I will be running CPU/memory intesive applications on this server in addition to it being file storage for my work (research lab). IF I install the OS (haven't decided which one, probably Ubuntu or Fedora or some other good linux distro) on separate drives will there be any performance problems if they aren't configured in RAID10? IF it is better to have the OS on separate drives should I go for 150GB velociraptors in RAID1 or smallish SSD drives in RAID1? Money is unfortunately a factor as I think I'm close to maxing my budget as it is. Thanks!

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• How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• mpstat on slackware 13.0 shows no utilization

  - by conartist6

  As the title says, the mpstat command, executed on Slack 13.0 continuously shows almost no processor utilization of any sort. In fact none of the output ever seems to change at all. The system is dual processor board with two hyperthreaded P4 Xeons. Any ideas? 08:50:06 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 08:50:06 PM all 0.38 0.00 0.03 0.03 0.00 0.00 0.00 99.56 1510.46 08:50:06 PM 0 0.50 0.00 0.05 0.10 0.00 0.01 0.00 99.33 11.90 08:50:06 PM 1 0.32 0.00 0.03 0.01 0.00 0.00 0.00 99.64 0.00 08:50:06 PM 2 0.38 0.00 0.03 0.01 0.00 0.00 0.00 99.58 0.00 08:50:06 PM 3 0.29 0.00 0.02 0.00 0.00 0.00 0.00 99.68 0.00 This is, literally, the only output I can get from the program. No values change ever.

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• Real RAM latency

  - by user32569

  Hi, very quick question. When I look for RAM timing, I got 2 different explanations on what is CAS latency. First states, its the time after command to read has been issued from CPU and data are send to data bus. Second says its time betwen column in memory layout has been activated. So, where is the truth? I mean, when I want to know total RAM latenci, in case 1, ot would be just CAS times one clock time. In second case, it would be CAS+other things like RAstoCAS and so times one clock time. Thanks.

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• Windows freezes, showing a random color or pattern

  - by Manu

  I have a PC with windows 7, and I'm experiencing random freezes with increasing frequency. After some time (from 30 minutes to a few hours) the screen will shows a random color or pattern (vertical lines) and nothing works anymore, I need to reboot manually. I've checked the events log, but nothing is shown except for the unexpected reboot. I've tested the RAM with Memtest86+ 4.20, and the graphics card with FurMark 1.10.3, no errors have been found. I've updated the graphic drivers and openned the case to remove dust, but the issue is still there. Also, the problem doesn't seem to arise when I'm playing games fullscreen, but when I'm surfing the web, using itunes, or coding. My hardware is as follows : intel core i5 750 CPU, ATI Radeon HD 5670 graphics card, ASUSTeK P7P55D motherboard, two 2Gb KINGSTON DDR3 ram sticks, 2 SATA hard drives, a Netgear dongle for wifi.

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• Sharing RAM resources between 2 or more computers

  - by davee44

  I know there was a somewhat similar question before: How to share CPU or RAM? But, let me just specify it a little more... When Microsoft Windows requires more RAM capacity than available it uses a swap-file to temporarily store the data there, this is actually something like a hard-drive-based RAM. This technology is used for many years. Theoretically, it shouldn't be too hard to implement a similar technology that uses the RAM of different computer(s) in the network for temporary data storage. This just requires a software that runs on computers in the network that accepts and returns data from/to the main computer and keep that data in the RAM; plus the operation system of the main computer must have the ability to use computers in the network instead of (or in addition to) the swap-file. I wonder, are there any implementations of this idea? This would allow users to build RAM clusters using all of their home or office computers, that will boost the performance of a single computer for some development/gaming/video tasks, etc.

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• Isn't ethernet used for LAN?

  - by Alraxite

  I'm not really knowledgeable about networking stuff, hence the stupid question. I read that ethernet was used for LAN connections but I'm pretty sure what I'm currently using to connect to the internet is 'ethernet'. The only knowledge that I have about networking is that there are two types of internet connections: Dial-up and broadband. And broadband can be either DSL or cable. So where does ethernet come from? The only thing I can tell is that I have a DSL model and there is an ethernet port at the back of it, a cable from which runs to a port in the back of my CPU. So, can ethernet be used to connect to the internet? Is it a subtype of DSL? I'm really confused about this, so I would really appreciate if someone could explain this to me. Also, I will apologize if this isn't the right place to ask.

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• How can I get a windows server to collate and email 4 daily reports/graphs for server performance

  - by Glyn Darkin

  I run a windows 2008 webserver and would like to setup the most basic performance monitoring in the world. What i would like is: a plot of ASP.Net request time for each w3wp process for a 24hour period a plot of CPU% utilisation for each w3wp process for a 24hour period a plot of Memory utilisation for each w3wp process for a 24hour period a plot of network utilisation for each w3wp process for a 24hour period a plot of disk utilisation for each w3wp process for a 24hour period I would these plots to be emailed to me each morning. Anybody know what is the simplest way to set this up? Thanks for your help in advance. Glyn

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• Games + Closed Lid = Hibernation

  - by Isaac Rabinovitch

  I have an ASUS N53S that I mainly bought for its RAM capacity. (I run a lot of VMs.) But as a bonus, it came with a fancy ATI video card. So I decided to install GTA 4 and plug it into a big monitor and settle down for some casual mayhem. But after about 5 minutes, it goes into hibernation! What gives? Since I was using an external monitor and didn't need the keyboard (using an XBox controller) I closed the lid on the laptop. Gaming is compute-intensive, so my GPU and CPU were both working hard and generating heat. Closing the lid interfered with cooling. Since I have the laptop configured to hibernate when I press the power button, the heat-triggered shutdown caused hibernation.

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• KVM vs Hyper-V. Which hypervisor is best for windows guests?

  - by user198851

  I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs Processor corei5. (4 physical cores and 8 Threads with HT Technology) RAM 8 GB. HD 500 GB. I have created 4 windows xp guests with 512MB RAM and 1VCPU. On each windows guest i have installed visual studio 2008 only. In nova.conf CPU Over-Commit ratio is 2 for better performance (as mentioned in openstack operation guide). Using KVM as hyerpvisor. I have observed poor performance when simultaneously using visual studio in four windows instances. How i can improve performance ? Should i use KVM or Hyper-V ? or any other suggestion ?

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• large RAID 10 vs small RAID1

  - by user116399

  The machine will store and serve millions of small files (<15Kb each), and all those files require a total storage space of 400G Considering the exact same SATA hard drives maker and models, on the exact same environment (OS, cpu, ram, raid controller, etc...) which one of the setups bellow would be faster? A) RAID 1 with 2 drives of 2T each, making up total storage of 2T B) RAID 10 with 4 drives of 2T each, making up total storage of 4T [EDIT]: I'm aware RAID10 is faster than RAID1. The larger the disk, at least in theory, the longer will take to do seeks/writes. So, will the performance gain of RAID10 will be outweighed by the "drag" caused the larger disk area when seek/write operations happened?

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• Hardware changes to require XP Activation ? (for a Virtual Machine)

  - by NVRAM

  I have WXP-64 running on a VM and, for testing and performance reasons, I would like to occasionally change the allocations for it. Changes might include: Number of CPU cores, Amount of RAM Add/remove network adapters. But I'm concerned that XP will demand re-activation and that I might eventually have licensing issues if I do this. So, can anyone tell me: What kind of changes trigger re-activation in XP? Is there limits or caveat with regard to re-activation? I've perused this question and the article it references, but wanted more recent and verified info. (FWIW, I'm not trying to cheat: the OS copy was purchased explicitly for the VM.)

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• RCA monitor won't display highest resolution when NVidia drivers are installed

  - by novellterminator

  My computer is a dual-monitor setup. It won't display my second monitor's highest res... In fact, it will only display one resolution. Anything higher or lower makes the monitor not show the screen. I've had this problem with this computer, and I upgraded almost all my components (cpu, RAM, mobo, and video card included) and I still have this problem with my new setup. This leads me to believe it's a problem with my monitor and the NVidia driver together. Any thoughts on what can be done? The manufacturer of the monitor doesn't make a driver for this monitor. I used to run Windows Vista and now my new setup runs Windows 7.

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• Offer me an ASP.NET & a SQL Server 2008 server specifications for about 2000 concurrent users, please.

  - by amkh

  We have a web application project wich will be created using ASP.NET 4.0, Entity Framework, and SQL Sever 2008 R2. To meet the needs, suppose a normal page of this application that has a query which it takes 10 miliseconds to response on a Core2 Quad @ 2.8GHz proccessor with 2x2GB of DDR3 Ram (EntityFramework overheads are considered). And we will have about 2000 concurrent user at peek times. So, what is the best recommended specifications (CPU/RAM/RAID/...) for the server which will be host this application? -- Or -- How can I calculate that?

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