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• Why is a single thread spread across CPU's?

  - by Marcus Lindblom

  I'm just curious why the scheduler constantly moves an app between CPUs, rather than keeping it on one. It looks a bit silly to have 4 cores at 25% rather than one at 100%. Does it has to do with heat, or is it more efficient somehow? Do other OS's do it differently? Insights or links to in-depth stuff would be nice. (Couldn't find much myself.) Update: By "spread out" I don't mean that it executes on several cpu's at once, but is being moved from one to the other several times per second, making the effect that it looks spread out.

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• Calculating IOPS for a single HDD - what am I doing wrong?

  - by red888

  So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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• ganglia graphs like munin for cpu, etc?

  - by CarpeNoctem

  I'm coming from munin and a CPU graph contains data for system, user, nice, etc ALL on one graph. I just installed ganglia and setup the basic monitoring. It appears that each type of cpu data is a separate graph! WTF is this and can I change the defaults to combine these into a single per host? That is my question, how do I combine cpu data into a single graph. Also, can I change the layout to something closer to munin's day-week side-by-side layout? I'm trying to be impartial and give ganglia a chance. ;)

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• What hardware makes a good MongoDB Server ? Where to get it ?

  - by João Pinto Jerónimo

  Suppose you're on dell.com right now and you're buying a server to run your MongoDB database for your small startup. You will have to handle literally tens of thousands of writes and reads per minute (but small objects). Would you go for 2 processors ? Invest more on RAM ? I've heard (correct me if I'm wrong) MongoDB handles the most it can on the RAM and then flushes everything to the disk, in that case I should invest on a CPU with a large L2 cache, probably 40GB of RAM and a solid state drive.. right ? Would I be better off with a high end (~$11,309, 2 expensive processors, 96GB of RAM) server or 2x(~$6,419, 2 expensive processors, 12GB of RAM) servers ? Is Dell ok or do you have better sugestions ? (I'm outside the US, on Portugal)

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• Tell browsers to cache until last modified date changes?

  - by Chad Johnson

  My web site consists of static HTML files which are usually republished once per day, and sometimes more. I'm using Apache. In the vhost settings for my site, I'd like to tell browsers to cache HTML files indefinitely, until Apache sees that they are modified. So as soon as an HTML file is changed, Apache should immediately begin telling browsers it's changed and send the updated file. As soon as a new file is published, browsers should immediately begin receiving that...they should never receive old versions of files. Maybe ExpiresByType text/html modification and no "plus x days." Is something like this possible?

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• Create FTP accounts with access to just some folders in the web directory

  - by Karevan

  I own a VPS server. At the moment I havent installed any FTP server on it, I am using SSH and SFTP only. I am using Debian 6 Squeeze and Apache2 service. The web directory is in /var/www/ Well, I wanted to create different FTP accounts and give access to some people to them (one account per user). In my web directory I have an structure like this: /var/www/mtaplugins/music/mplayer/music/ /var/www/mapuploader/ and more folders inside. I want to create an FTP account which should be able to just access one of those folders and the folders inside them. I would appreciate some recomendations or stept to follow before installing anything or doing anythong, because I dont have any idea about this. I was thinking in using ProFTPd but as I saw in the documentation it would just create an account for each user in my server, and I want to not create more users (I always use root) Thanks in advance

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• meta.stackoverflow.com has a problem

  - by asker

  Sorry, this is off topic, but fact evolved that meta.stackoverflow does only allow posting with openid despite stating possibility of post per nick/email. Posted here because underlying prob stemmed from serverfault. So here is a copy: Despite stating that submission via nick/email were possible, required fields are not given. Please fix or state that critique be only issued non anonymously. Tags OpenID Login Get an OpenID Oops! Your question couldn't be submitted because: must include one of these tags -- bug feature-request discussion support users with less than 99 reputation can't create new tags. The tag 'limit' is new. Try using an existing tag instead. name and email, or your OpenID, are missing

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• How to put several files in one archive?

  - by Roman

  I have 10 files which I need to send per e-mail. It is inconvenient for me all 10 files and it will be inconvenient for the receiver to download all 10 files (it can be annoying to do the same operation 10 times). I would like to put all 10 files into one files (I think it can be done as archive). How can I do it? Important details. I am working in the Windows 7 and prefer to do the mentioned operation from the command line. In the directory, where I have my 10 files, I have many other files which I would not like to include into the archive. The files are small, so compression rate and size do not play any role. I just one to have an easy way to put 10 files into one and then easily to extract these 10 files.

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• As a small business about to overhaul infrastructure and go virtual, how can we take advantage of all the features of the QNAP TS-439 Pro II+?

  - by Sally

  Specifically, how can we benefit from these current list of features? We're very new to this and I want to be able to talk intelligently to our IT consultant. VMware Ready Citrix Ready Built-in iSCSI target service Virtual Disk Drive (via iSCSI Initiator) Remote Replication Multi-LUN per Target LUN Mapping & LUN Masking Support SPC-3 Persistent Reservation Support What other products should we compare this QNAP to? I appreciate how informative the site is, but they only seem to sell their products through a small number of channels. Is QNAP well known? TIA!

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• How can I flush my ssh keys on power management activity?

  - by Sam Halicke

  Hi all, Using ssh-agent and private keys per the usual. Everything's working as normal. My question regards best practices on flushing keys from ssh-add on activity like sleep, suspend, hibernate, etc. I thought about writing a simple wrapper around those commands, but then wondered if are they even called? Or does the kernel initiate this activity directly? Are the PM utilities strictly userland? I would like this additional layer of security beyond locking my screen, etc. and was wondering if anyone else had solved this elegantly or has best practices to recommend. Thanks.

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• What is a easiest way to implement Mail Server in ubuntu and hook in webmail through XAMPP?

  - by Parris

  Hi Everyone, I currently have xampp running on my ubuntu server. I tried a variety of things including installing, postfix+dovecot+roundcube+postfixadmin (postfix+dovecot work I think, postfix admin also works, roundcube works and connects to dovecot but i cant create user accounts, or figure out how that works), citadel (it installed, but I have no idea how to make it work with xampp for webmail) and i tried messing with exim and vexim a bit also. In short I feel like this should be a lot easier, and I can't figure it out haha. XAMPP works fine. I got my server running with everything. I was thinking about mercury mail, but I need a webmail solution also. I was thinking about google apps, but 50 bucks a year per user is a steep change from free. Thanks for the help!

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• How to Setting up Amazon EC2 with own OS and DB ?

  - by Spencer Lim

  i got my own version of OS and DB which are window server 2008 Hyper-V R2 and Sql server R2 2008 both in enterprise version may i know how to configure it up and running ? with amazon EC2, what other is a must combination to make it run ? also how could i install the operating system and DNS ? i never doing server before, but i just need something like VPS to support my development and testing. Amazon Ec2 seem the best and cheapest service due to only $1 per hour. Appreciate if Any brief guide provided, Thx =D

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• Internet addicted, need software to control my usage and block access

  - by user69991

  I found I have problem to be a little addictive with surfing on internet. I am trying to find a free ware, (or software), that can help me for exemple to be just 2 hours per day on internet. Like it is counting the minutes and than stop working. not just 2 hours in one time, but in whole day.... maybe that it has different modes (2hours together, in whole day, 2hours + little reserve time) but I need something that really take me away access from internet :) Just counting time, is not enough for me :) Hope we will find something because, I just can't avoid not to loose 4 hours on internet. I have windows 7

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• Troubleshoot odd large transaction log backups...

  - by Tim

  I have a SQL Server 2005 SP2 system with a single database that is 42gigs in size. It is a modestly active database that sees on average 25 transactions per second. The database is configured in Full recovery model and we perform transaction log backups every hour. However it seems to be pretty random at some point during the day the log backup will go from it's average size of 15megs all the way up to 40gigs. There are only 4 jobs that are scheduled to run on the SQL server and they are all typical backup jobs which occur on a daily/weekly basis. I'm not entirely sure of what client activity takes place as the application servers are maintained by a different department. Is there any good way to track down the cause of these log file growths and pinpoint them to a particular application, or client? Thanks in advance.

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• Determine / set Puppet environment

  - by quickshiftin

  I'm trying to determine what Puppet thinks the environment is on my agent nodes. Per the documentation I've configured the agent's environment in /etc/puppet/puppet.conf as such [agent] environment = development In order to view the environment I've found this code to add an environment fact to facter: require 'puppet' Facter.add("environment") do setcode do Puppet[:environment] end end However, on one of my agent nodes, if I run sudo facter -p environment, the result is production. I've tried to manually set the environment temporarily via sudo puppet agent --environment development, however the result from facter is the same. Any idea what's going on?

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• Does LDAP fit the role of a user database for an application?

  - by Spredzy

  I (my company) run a webservice that integrates pieces of few entreprisey-level software. Most of them offer different type of authentication but all offers at least LDAP. I was wondering if storing my application users directly in an LDAP directory would be a good idea. This way all the application I am using could rely on it for authentication purpose. I am aware that LDAP is not a database per se, but it is a datastore. I am also aware that there is no kind of constraints thus deleting a user on the LDAP directory won't do anything on my actual data, but this case would be taken care of with an extra process. My main question here is : is there any reason why I shouldn't use LDAP as my users database ?

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• Making python run on my webserver

  - by richzilla

  Hi all, im getting a bit stuck regarding options for running python scripts on my server. From the research ive done so far, i can see i need to modify apache slightly to run python scripts, by using either mod_wsgi or mod_python. Two issues i have: mod_python doesnt appear to be maintained anymore (last release, 2007) mod_wsgi appears to require modification of my httpd.conf file on a per application basis. What im wanting to know, is there a way of getting python scripts to run in the same way as php, i.e. just by going to index.py etc... or is it more involved than that? At present im just trying to set it up on my xampp install. Any help would be appreciated.

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• Windows 7 - Remote Desktop - multiple credentials

  - by w--

  My home network consists of a couple Windows XP machines and a Windows 7 box. One of the Windows XP boxes is like a shared server accessed via Remote Desktop. I have an account on there and my gf has another. Previously I was able to save RDC shortcuts to this shared server including credentials. So in order to access the server from a computer on the network, I just needed to open the shortcut. I thus would have two shortcuts, one for my account and one for my gf's. In Windows 7, it seems to store credentials for a box based on machine name. I.e. I can only store one set of credentials per machine name. This seems incredibly stupid so my question is: In Windows 7, is there some way to have RDC shortcuts that use different credentials to login to the same target box?

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• What is the maximum number of TCP connections I can have in Windows Server 2008?

  - by evilfred

  I would like to have as many connections (single connections from many different clients) as humanly possible in a server running on Windows Server 2008, in order to support a Comet-style application. The application is written in C#. The connections will not be chatty, they just need to be open (and stay open). Buying boatloads of memory and fast CPUs are not a problem. As far as I can tell, I will be limited to 65k simultaneous open connections per NIC - the maximum number of ports. Is this accurate? Or can I go beyond 65k connections / NIC somehow? It seems like there are server products for Linux at least that support hundreds of thousands of connections. How do they do this?

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• Mapping capslock to control on Mac OS X: works for some things, but not others?

  - by keflavich

  I've mapped my capslock key to control using the Modifier Keys mapping in System Preferences: Keyboard. I've also tried mapping to "right control" instead of "left control" as per http://hints.macworld.com/article.php?story=20060825072451882 using a plist editor. The mapping seems to work in all cases except one: I can't use capslock with left-shift to make key mappings or apparently do anything else. capslock (as control) with right-shift works. I'm primarily testing by using control-tab / control-shift-tab to switch between tabs. Using the on-screen-keyboard viewer, I can get capslock-shift-(just about anything) to work, but not capslock-leftshift-tab. My best guess is that somehow the particular keyboard I'm working on is faulty, but I'm curious whether anyone else can reproduce this or has any ideas.

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• Permissionless external drive with NTFS

  - by user12889

  I have an external hard disk which has 1 partition, formatted in NTFS. I use this drive on multiple computers with a different logins on different machines, Windows XP and Windows 7. All files are plain old files, not OS encrypted or compressed. Every now and then Windows 7 does not let me access some files, citing permission problems. I can circumvent this per case by taking ownership and setting appropriate permissions. This, however, is tedious. Is there a simple way to tell Windows to not enforce or store any permissions on any file/directory on a partition?

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• apache returning "The connection was reset"

  - by usjes

  One of my dedicated servers had some network issue today and the data center has to replace some router. Since then the sites on that server returns "The connection was reset" error most of the time. I tried installing nginx and it opens better, but it still shows the error sometimes. Everything in the config seems normal, what could be causing this error? UPDATE: Just noticed that in whm apache status there are always only 1 requests currently being processed, 8 idle workers. I know for sure the server received thousands of requests per minute. What could be limiting this to such a low number?

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• Tomcat startup.sh doesn't work

  - by OMG Ponies

  I've just installed Tomcat 6.0.20 (per Jira documentation recommendation) on RedHat EL 5 Server, and attempts to use: bin] # ./startup.sh ...result in: Using CATALINA_BASE: /opt/software/jira-tomcat-6.0.20 Using CATALINA_HOME: /opt/software/jira-tomcat-6.0.20 Using CATALINA_TMPDIR: /opt/software/jira-tomcat-6.0.20/temp Using JRE_HOME: /etc/alternatives/jre Usage: catalina.sh ( commands ... ) commands: debug Start Catalina in a debugger ... version What version of tomcat are you running? I've edited the catalina.sh file to add: echo $0 echo $1 ...and I see: catalina.sh start ...etc when I use: ./catalina.sh start Why does catalina.sh not use the parameter?

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• Is there a way to bundle pdf tiles to a Kindle friendly file?

  - by Maciej Swic

  I'm downloading PDF approach plates from Navigraph, and i have a folder per airport with files named after their corresponding approach / departure etc. Now I'd like to take such a folder with a bunch of PDF files, automatically generate an index and combine them to a single .mobi file that i can send to my Kindle. The index created can be very simple and consist of the file name (without the extension). Tapping an index item should jump to the correct page for that chart. I know there is a host of apps that combine comic book jpg's to ebooks, but is there anything that does the above please?

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• Waht are the best proxy servers for Mikrotik router?

  - by niren

  I want to setup proxy server for my Mikrotik router. There is inbuilt web-proxy for Mikrotik router but I can extend this upto transparent proxy(kind of proxy server) only. We need High anonymity proxy so that we can hide our LAN static IPs(we don't have private IP) from outside Intruder/hackers. And also I know I can setup NAT rule to hide our IP(only private IP not public/static IP) as per this link, but I cann't hide static/public IP. Essentially I want to hide our Public/Static IP (there is static/public IP for all systems in our company) from outside Internet. To achieve this I guess I need other software apart from Mikrotik router gateway setup. can anyone suggest me Is there any other software to achieve my requirement? I know about squid proxy but am not sure whether It can hide our static/public IP. Note: we have assigned public/Static IP to all systems of our company since we have rights to access our company's system from anywhere by dedicated laptop(given by our company with more security) through VPN connection.

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