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• Which SATA controller is better to use with Windows Server 2008 R2 64 bit?

  - by at8eqeq3

  We're preforming some hardware upgrade on our server machines. As a part of this process, we have to install some additional disk drives. Unfortunately, total number of drives will become 7 or 8, while all of our motherboards have only 6 SATA ports. Obviously, we need additional disk controllers. For now, we've tested Silicon Image (actually, no-name) and Adaptec controllers, both on SiI3132 chip, and got some problems with drivers for them: Silicon Image drivers are not installing at all, and Adaptec ones are installing, but the system says they're not signed and becomes unbootable. We're tryed both drivers from controllers' CD's and latest versions from manufacturers' websites, and no luck. So, can you recommend some SATA controllers that will really work without tambourine dances on mentioned OS (we need just 2 SATA ports and PCI-E, while RAID and any other features are no-matter)? Thanks for any help.

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• In Varnish, is it normal for the number of freed bytes to be 60% of those allocated?

  - by user331397

  I have an installation of Varnish 3.02 on an Amazon EC2 Medium Linux instance in front of two relatively low-traffic websites. After an uptime of 2 hours, there are 3400 objects in the cache. Using varnishstat, I checked the variables SMA.s0.c_bytes and SMA.s0.c_freed, which I assume correspond to the total number of bytes allocated since startup and the number freed, respectively. No objects should have had time to expire during these two hours, but still about 60% of the memory allocated since startup (330MB out of 560MB) has already been freed. Do you know if this is normal? If not, do you know what kind of configuration could be wrong?

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• How necessary is using PHP filters?

  - by Jamie

  I'm a relatively newbie to PHP and just making my way through the W3Schools tut. The tut makes a big point of saying you must always filter external data (i.e. cookies, form data etc). I'm writing a fairly simple system that talks with a third party Joomla extension. It's at a prototype stage where I'm just wanting to demonstrate the functionality in a minimum viable product. Basically, I'd like to know... what's the worst that could happen in I don't filter content. Are we talking 'I might get a bunch of spam', or 'a good hacker could get root server access'? Have hunted around online, but would love any of your experience / insight on the matter!

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• Apache CPU usage stays at 100% even when there are no requests

  - by Leirith

  Hi, I've been running the Apache HTTP server benchmarking tool (ab) on my new Apache server to test performance. I noticed that with a command like the following: ab -n 100000 -c 1000 http://www.mysite.com/ The CPU is used 100% by the apache2 processes during the testing. When the test concludes, usually with the following error just before the last requests are made: apr_poll: The timeout specified has expired (70007) Total of 99960 requests completed the CPU usage remains at 100%, and it's all being consumed by apache. I am using the worker MPM with and running PHP with mod_fcgid. Any advice as to why this is or what can be done to stop it would be appreciated.

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• Hyper-V CPU Utilization, Good Tools?

  - by yzorg

  I just learned a ton from this post: Host CPU% doesn't include child VM CPU%, specifically I learned that both the 'host OS' and 'child VM' are siblings within the HyperVisor layer. Are there good utilities for 'watching' the total CPU and other resource counters at the HyperVisor (hardware) layer? I know perfmon (watching special Hyper-V CPU counters) is the standard answer, but I've stayed away from perfmon for ad-hoc monitoring. Is there a good OSS or free tools to 'watch' the resource utilization as I create multiple new VMs running on the server? I'm a developer, so if there aren't any good UI tools to surface this data I'd consider creating one, but only if needed. P.S. My specific scenario is I'm creating new web, SQL and back-end server VMs for new Windows 8 Server and SQL 2012 (entire application stack). I need to monitor them for utilization and know when I need to grow beyond 1 host (I'll need to split the VMs into separate hosts as I hit hardware limits of the 1st host, and diagnose problems).

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• Storing CLLocationCoordinates2D in NSMutableArray

  - by Amarsh

  After some searching, I got the following solution : ref: http://stackoverflow.com/questions/1392909/nsmutablearray-addobject-with-mallocd-struct CLLocationCoordinate2D* new_coordinate = malloc(sizeof(CLLocationCoordinate2D)); new_coordinate->latitude = latitude; new_coordinate->longitude = longitude; [points addObject:[NSData dataWithBytes:(void *)new_coordinate length:sizeof(CLLocationCoordinate2D)]]; free(new_coordinate); And access it as: CLLocationCoordinate2D* c = (CLLocationCoordinate2D*) [[points objectAtIndex:0] bytes]; However, someone claims that there is a memory leak here? Can anyone suggest me where is the leak and how to fix it. Further, is there a better way of storing a list of CLLocationCoordinate2D in NSMutableArray? Please give sample code since I am an Objective C newbie.

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• High load on a nagios server -- How many service checks for a nagios server is too many?

  - by Josh

  I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the check_http plugin even 5 minutes, some every minute. Recently the load on the nagios server has been above 4, often as high as 6. The server also runs cacti, gathering statistics every minute for 6 hosts. I wonder, how many services should hardware like this be able to handle? Is the load so high because I am pushing the limits of the hardware, or should this hardware be able to handle 42 service checks plus cacti? If the hardware is inadequate, should I look to add more RAM, more cores, or faster cores? What hardware / service checks are others running?

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• Ubuntu 14.04 says insufficient memory in my /boot memory alocation while updating

  - by Aravind Dollar

  I am new to Linux platform. I just tried installing Ubuntu alongside windows but allocated only 200 mb to the /boot partition which is not recommended. Now Ubuntu software update keep on insists me no enough space. What should I do? Is there any way to increase my /boot partition without removing the total OS? Or should I completely uninstall Ubuntu and put it back? Please anyone suggest me over this issue. I have no idea what to do. And please be elaborate, as I am new to Linux environment.

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• Backup of images

  - by Sam Kong

  I've just installed a Ubuntu for a file server. It will share a folder (samba) and employees of my company will save photos on that. Currently the total amount of the photos is about 100GB and every day 20MB will be added. My question is about backup plan. I want to backup the photos to a remote server using a cron job. I can think of 2 things. rsync git Image files won't be changed so rsync will do. But as people say, I must git all my data. What would you do? Thanks. Sam

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• ns-2 c++ file changes

  - by stanigator

  I have just installed a network simulator program called ns-2 and I am trying to familiarize myself with it by going through the tutorial by Marc Greis. When I get to the stage where I'm messing around with C++ source files and related program C++ source files as stated in http://www.isi.edu/nsnam/ns/tutorial/index.html, I don't know what to do as there are enough inconsistencies between the version of ns-2 that I downloaded (which is the latest stable build) and the guide. What would your recommendations in this case, as I don't know what to do with it as a newbie? Thanks in advance for your help!

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• Painless way of consolidating files across multiple machines/OSes

  - by 5arx

  Just bought a NAS. So I thought I'd get all our photos, media files and pdfs consolidated, de-duplicated, de-junked and virus-checked and stick them all on it. We have 3 laptops, one running Windows, the others OSX. We have a file server running Windows - it was the result of an earlier attempt at a networked fileserver - and a Mac Pro that is also kind of a server (previous attempts at this job have resulted in most of our stuff being on it). Also memory cards/sticks, cd backups and so on. I would be grateful if anyone could suggest a strategy or, ideally, tool(s) I could use to solve this problem. It is probably no more than one or two terabytes of data in total, but I can imagine that going through it all manually, file-by-file may well drive me insane.

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• Default Webcam Driver Issues

  - by Omegaclawe

  I'm having troubles getting my monitor-attached webcam (ASUS VK248H) to install on my new computer. On the old computer, it was a matter of not using a USB 3.0 port, but I can't get anything to work on the new one. I have tried all manner of uninstalling/reinstalling the driver and resetting the computer, as well as literally every USB port on the computer (14 in total). It's not that windows isn't recognizing the device; it most certainly is. However, comparing it to the old computer's driver details, on the new computer, it is not using the ksthunk.sys driver in addition to the usbvideo.sys driver, like on the old (working) computer. Naturally, I figured the way ahead was to simply get this other driver to work with the hardware, but haven't really found out a way to do that. Does anyone know of a way I can force it to use ksthunk.sys? It seems rather difficult to get it to install anything when Windows is feeling that everything is peachy.

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• c++ std::map question about iterator order

  - by jbu

  Hi all, I am a C++ newbie trying to use a map so I can get constant time lookups for the find() method. The problem is that when I use an iterator to go over the elements in the map, elements do not appear in the same order that they were placed in the map. Without maintaining another data structure, is there a way to achieve in order iteration while still retaining the constant time lookup ability? Please let me know. Thanks, jbu edit: thanks for letting me know map::find() isn't constant time.

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• Cannot Access Kickstart.php

  - by user282659

  Hey All Let me explain you the scenario upto now.. Been a newbie to Joomla I managed to build my own website using Joomla CMS in my computers localhost. Then after the completion of the site, I wanted to upload my Local Joomla Site to a GoDaddy Server / Hosting Account.. Thanks to Google I found the below mentioned tutorial, http://zensamarketing.com/2009/07/how-to-use-joomlapack-and-kickstart-to-upload-your-local-joomla-site-to-a-godaddy-server-hosting-account/ So far I completed up to the 7th step, But I'm stuck at the step 08. I'm using Filezilla as my FTP client, Using that I uploaded the files as per the guided on step 07 and when I try to access www.mysitename.com/kickstart.php, it is giving me the below error, Forbidden You don't have permission to access /kickstart.php on this server. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request. How can I set permission... Please explain in a non technical way.. Thank you so much in advance smile

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• Amazon EC2: how to find out detailed CPU usage?

  - by j0nes

  I am running several EC2 instances, and I want to know the exact work my CPU is doing. On "normal" machines I am doing this with munin and its CPU plugin which looks at the statistics provided by /proc/stat. On my EC2 machines however, I get incorrect graphs. The machine has two cores, so the max CPU usage should be 200% - however it gets as high as 400%: I know that I should use Amazon CloudWatch to see the total CPU usage (and this is the official and recommended from Amazon way to do this), but I am specifically looking on how the CPU usage is spend (e.g. system, user, iowait). Is there a way to get detailed CPU usage statistics on EC2 instances?

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• How to efficiently dump a huge MySQL innodb database?

  - by Jagbir

  I got an Ubuntu 10.04 production MySQL database server where total size of database is 260 GB while size of root partition is itself 300 GB where DB is stored, essentially means around 96% of / is full and there's no space left for storing dump/backup etc. No other disk is attached to server as of now. My task is to migrate this database to other server sitting in different datacenter. Question is how to do that efficiently with minimum downtime? I'm thinking in line of: Request to attach an extra drive to server and take a dump in that drive. Transfer dump to new server, restore it and make new server slave of existing one to keep data in sync When migration is needed, break replication, update slave config to accept read/write requests and make old server read-only so it won't entertain any write requests and tell app developers to update there config with new IP address for db. What's your suggestions to improve this or any alternate better approach for this task?

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• Windows DFS Limitations

  - by Phil

  So far I have seen an article on performance and scalability mainly focusing on how long it takes to add new links. But is there any information about limitations regarding number of files, number of folders, total size, etc? Right now I have a single file server with millions of JPGs (approx 45 TB worth) that are shared on the network through several standard file shares. I plan to create a DFS namespace and replicate all these images to another server for high availability purposes. Will I encounter extra problems with DFS that I'm otherwise not experiencing with plain-jane file shares? Is there a more recommended way to replicate these millions of files and make them available on the network? EDIT: I would experiment on my own and write a blog post about it, but I don't have the hardware for the second server yet. I'd like to collect information before buying 45 TB of hard drive space...

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• Why is process not being displayed by TOP

  - by drN

  I am running a Mathematica script (this question probably doesn't fit in Mathematica.SE however) and I know that it generally takes up a lot of RAM and loads up my cores. However, althought pgrep MathKernel is showing a pid, I find that top doesn't show this in the top processes, although I notice that it is taking up about 2.25GB of the 8GB available to me. pmap -x my_process_id total kB 2243132 1907404 1892108 AND ps aux | grep MathKernel dnaneet 20837 12.6 23.3 2234944 1907404 pts/1 Sl 09:23 8:01 /share/apps/mathematica/8.0.4/SystemFiles/Kernel/Binaries/Linux-x86-64/MathKernel -runfirst $TopDirectory="/share/apps/mathematica/8.0.4" -script ./dcm_10micrometer_2x -- ./dcm_10micrometer_2x ps aux shows that the process is taking about 12% (In asterisks) dnaneet 20601 0.0 0.0 68264 1660 pts/1 Ss 09:15 0:00 -bash **dnaneet 20837 12.2 23.3 2234944 1907404 pts/1 Sl 09:23 8:01 /share/apps/mat** dnaneet 21922 0.0 0.0 65604 948 pts/1 R+ 10:29 0:00 ps -aux Did this process fail and is the MathKernel just lingering?

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• What is annotations and how do it actually works for frameworks like Spring ?

  - by Rachel

  I am new to Spring and now a days I hear a lot about Spring Framework. I have two sets of very specific questions: Set No. 1: What are annotations in general ? How does annotations works specifically with Spring framework ? Can annotations be used outside Spring Framework or are they Framework specific ? Set No. 2: What module of Spring Framework is widely used in Industry ? I think it is Spring MVC but why it is the most used module, if am correct or correct me on this ? I am newbie to Spring and so feel free to edit this questions to make more sense.

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• What's a fast way to copy a lot of files from an internal hard-drive to external (USB) storage?

  - by jonathanconway

  I have a large amount of data - about 500 GB - on the internal hard drive of a desktop PC. This includes music, videos, PDFs... you name it. I want to copy everything to an external USB hard drive (1.5 tb capacity). The desktop PC runs Ubuntu. To being with, I simply plugged in and mounted the hard drive and dragged the top-level folder onto the drive. It's started copying, but it seems to be proceeding very slowly. About 10 minutes later and it's only done about 500 MB. I'm sure this is slower than what I could achieve with less total data. So I'm wondering if there's a quicker way of doing this. Would it be better to copy it in portions of 500MB or so, rather than all at once?

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• "Cannot allocate memory" while no process seems to be using up memory

  - by omat

  I am not competent on server issues, any help is much appreciated. When try to start a python/django shell on a linux box, I am getting OSError: [Errno 12] Cannot allocate memory. free -m seems to confirm I am out of memory: total used free shared buffers cached Mem: 590 560 29 0 3 37 -/+ buffers/cache: 518 71 Swap: 0 0 0 But I cannot see what is eating up the memory with top or ps aux: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 24336 908 0 S 0.0 0.2 0:00.68 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:04.85 ksoftirqd/0 How can I identify the leak? Thanks. BTW, I am not sure if it is relevant, but the machine I am talking about is an AWS EC2 instance with Ubuntu 12 running.

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• How do I make PyScript work? Says it cant find python26.dll

  - by Alex

  I installed PyScript to try it out but it just wont start. It only gives me the error: "Error126: Could not open Dll "python26.dll" followed by: "Python could not be properly initialized. We must quit." I think this may have something to do with the PYTHONPATH but since I'm a newbie and dont know what it is or exactly what to put in the PYTHONPATH, after some googling, I ask here. Also, when I tried to install wxPython it was impossible becouse the PYTHONPATH could not be found. I have installed ActivePython 2.6 and the PATH is set so I can access python in cmd.

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• How do I recover a RAID 1 volume on Mac OS X (10.7)?

  - by Avry

  I have a Synology NAS that I've set up with RAID 1. The device is set up with two drives, both the same size (i.e. 500 GB each), formatted in ext3, as a RAID 1 volume (i.e. even though the total capacity is 1TB, I effectively only get 500 GB). In the case of a device failure where I can only access one of the drives, how can I recover my data? The solution I'm looking for is something like: 'Put the working drive in an enclosure, and use <some software> to recover your data.'

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• How do I take some RAM and use it towards Dedicated video memory for my Nvidia graphics card?

  - by Noah Rainey

  I have a Nividia GeForce 6150SE nForce 430 graphics card (so it's quite old), it only gets 64MB of dedicated memory by default. I went into the bios and see if I can increase it, but it wouldn't let me. However, from the Nividia control panel I see I have up to 1071MB of total available graphics memory. I'm not sure what that means and I'm not sure how I can harness this memory and use some RAM for my graphics card. Can someone explain if this is possible and if so, how?

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• Web Farm Application deployment best practices

  - by rauts

  Hi All, We are having a web farm which hosts multiple ASP.Net applications. We typically have 4 servers on the farm. The dilemma which i am having is in terms of capacity issue of the farm. Lets say i have currently got 200 apps in total. Should I deploy all 200 apps on all 4 servers (i.e. all the servers in the farm are identical) or should i split the applications between 2 sets of server and create 2 smaller farms so that i can then manage the application based on its criticality and usage etc. Any best practices in this area would be highly appreciated. Thanks Rauts

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