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  • System Requirements of a write-heavy applications serving hundreds of requests per second

    - by Rolando Cruz
    NOTE: I am a self-taught PHP developer who has little to none experience managing web and database servers. I am about to write a web-based attendance system for a very large userbase. I expect around 1000 to 1500 users logged-in at the same time making at least 1 request every 10 seconds or so for a span of 30 minutes a day, 3 times a week. So it's more or less 100 requests per second, or at the very worst 1000 requests in a second (average of 16 concurrent requests? But it could be higher given the short timeframe that users will make these requests. crosses fingers to avoid 100 concurrent requests). I expect two types of transactions, a local (not referring to a local network) and a foreign transaction. local transactions basically download userdata in their locality and cache it for 1 - 2 weeks. Attendance equests will probably be two numeric strings only: userid and eventid. foreign transactions are for attendance of those do not belong in the current locality. This will pass in the following data instead: (numeric) locality_id, (string) full_name. Both requests are done in Ajax so no HTML data included, only JSON. Both type of requests expect at the very least a single numeric response from the server. I think there will be a 50-50 split on the frequency of local and foreign transactions, but there's only a few bytes of difference anyways in the sizes of these transactions. As of this moment the userid may only reach 6 digits and eventid are 4 to 5-digit integers too. I expect my users table to have at least 400k rows, and the event table to have as many as 10k rows, a locality table with at least 1500 rows, and my main attendance table to increase by 400k rows (based on the number of users in the users table) a day for 3 days a week (1.2M rows a week). For me, this sounds big. But is this really that big? Or can this be handled by a single server (not sure about the server specs yet since I'll probably avail of a VPS from ServInt or others)? I tried to read on multiple server setups Heatbeat, DRBD, master-slave setups. But I wonder if they're really necessary. the users table will add around 500 1k rows a week. If this can't be handled by a single server, then if I am to choose a MySQL replication topology, what would be the best setup for this case? Sorry, if I sound vague or the question is too wide. I just don't know what to ask or what do you want to know at this point.

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  • Vagrant - Failed login, ssh not set up

    - by motleydev
    This question is two fold because somewhere in my attempts to solve the problem, I created a new one. First: I was trying to vagrant up using a Vagranfile based on the standard hashicorp/precise32 box. Everything worked up until default: SSH auth method: private key where it would eventually time out. Enabling gui in the Vagrantfile showed that the machine never actually logs in. I can use the standard user/pass and log in from that point but the vagrant up process still remains at that prior status. Here's where my understanding might be a little dim. I've tried setting auth method from the insecure_pass_key to my root ~/.ssh/id_rsa or whichever one I wanted to use. I'm not entirely sure where to put a copy of the public key or my authorized keys file. I've got a .vagrant.d folder in my user dir (I'm on OSX) which seems to contain the box images. I've got a .vagrant folder in my directory with the Vagrantfile which seems to contain the specific machine I am building off of. I've tried pouring over the docs and forums but I seem to be missing a key concept here. And Now: After a host of tips/tricks such as rolling back by VirtualBox install, uninstalling/reinstalling Vagrant and VritualBox several times, when I try to run vagrant ssh-config with a Vagrantfile based on the same hashicorp/precise32 it says that the box is not enabled for SSH. Specifically, this error: The provider for this Vagrant-managed machine is reporting that it is not yet ready for SSH. Depending on your provider this can carry different meanings. Make sure your machine is created and running and try again. Additionally, check the output of `vagrant status` to verify that the machine is in the state that you expect. If you continue to get this error message, please view the documentation for the provider you're using. So now I am slightly up a creek. Any help would be appreciated if not just clarifying a concept. Some pertinent info: I'm on OSX Maverics Due to the fact I'm running a dual HD system with system files on one HD and user files on another, my permissions are a little wonky and VBoxManage will only let me run commands via Sudo - not sure if it's pertinent - but maybe. I have no idea what I'm doing. That part is perhaps more important.

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  • Question about Installing an Intel E5300 CPU.

    - by jeff
    Can I re-use my heatsink/fan that is currently on the motherboard with this new Intel e5300 CPU ? I know both CPUs are socket 775 based CPUs. I have a 2.4 GZ single core Intel chip currently. Also would I be able salvage the thermal paste or should I just buy new paste?

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  • Multiple mouse settings on laptop?

    - by Jonas
    I'm wondering if this is possible. I use a macbook, running windows 7...when I don't have an external mouse connected, I leave the left/right settings of the buttons to the default. But when I plug in a mouse, I change that setting (since I use the mouse left-handed). When I unplug the mouse, I would like it to revert to the "unplugged" setting. Is there a way to get windows to remember mouse settings based on which device it's using?

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  • Does exists a software that act as DHCP service?

    - by marco.ragogna
    I need to configure a network made by a simple old hub with 24-ports a server and some clients. Both clients and server has Windows XP or later. If all clients has the DCHP service enabled does exists a software that, installed on the server, assigns automatically to the clients an IP based on a predefined range?

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  • Does Windows performance degrade past a certain level of CPU utilization?

    - by Mike Taylor
    Is there a recommended average CPU threshold in running Windows boxes based on experience in other shops? Background: We are running with Windows Server 2003 32-bit OS. Servers are handling a major enterprise-level web application suite with a high frequency of small transactions mixed in with much larger transactions - overall average is 13ms. Our average overall CPU utilization of the Windows servers are ~60% during prime-shift. And we question at what level does the Windows OS begin to shimmy on the CPU scheduling road? Thanks.

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  • TCP/IP & throughput between FreeNAS (BSD) server & other LAN machines

    - by Tim Dickerson
    I have got a question for someone that knows BSD a bit better than me that are in regards to my LAN setup at home/work here outside Chicago. I can't seem to fully optimize my network's (LAN) thoughput via my FreeNAS (BSD based) file server. It runs with the latest FreeBSD release which is modified to support several protocols for file transfers and more. Every machine that is behind my Smoothwall (Linux based) router is on the usual 192.168.0.x subnet and for most part works just fine. Behind the Smoothwall box, all machines are connected to a GB HP unmanaged switch. I host a large WISP here and have an OC-3 connection here at home/work and have no issues with downloading/uploading from/to the 'net'. My problem is with throughput. When I try and transfer large files...really any for that matter..between any of the machines to/and from the FreeNAS server via FTP, the max throughput I can achieve say between a Win 7 or a Linux box is ~65Mbit/sec. All machines are running Intel Pro 1000 GB NIC's and all cable is CAT6. Each is set to 'auto negotiation' and each shows 1500 MTU Full Duplex @1GB so I know the hardware is okay. I have not adjusted the MTU on any machine as I understand it to be pointless unless certain configurations are used (I assume I am not one of those). My settings for the FreeNAS machine are the following: # FreeNAS /etc/sysctl.conf - pertinent settings shown kern.ipc.maxsockbuf=262144 kern.ipc.nmbclusters=32768 kern.ipc.somaxconn=8192 kern.maxfiles=65536 kern.maxfilesperproc=32768 net.inet.tcp.delayed_ack=0 net.inet.tcp.inflight.enable=0 net.inet.tcp.path_mtu_discovery=0 net.inet.tcp.recvbuf_auto=1 net.inet.tcp.recvbuf_inc=524288 net.inet.tcp.recvbuf_max=16777216 net.inet.tcp.recvspace=65536 net.inet.tcp.rfc1323=1 net.inet.tcp.sendbuf_inc=16384 net.inet.tcp.sendbuf_max=16777216 net.inet.tcp.sendspace=65536 net.inet.udp.recvspace=65536 net.local.stream.recvspace=65536 net.local.stream.sendspace=65536 net.inet.tcp.hostcache.expire=1 From what I can tell, that looks to be a somewhat optimized profile for a typical BSD machine acting as a server for a LAN. I might be wrong and just wanted to find out from someone that knows BSD better than I do if indeed that is ok or if something is out of tune or what. Are there other ways I would find better for P2P file transfers? I honestly do not know what I SHOULD be looking for with respect to throughput between the NAS box and another client when xferring files via FTP, but I am told that what I get on average (40-70MB/sec) is too low for what it could be. I have thought about adding another NIC in the FreeNAS box as well as the Win7 machine and use a X-over cable via a static route, but wanted to check with someone first to see if that might be worth it or not. I don't know if doing that would bypass the HP GB switch and allow for a machine to machine xfer anyways. The FTP client I use is: Filezilla and have tried both active and passive modes with no real gain over each other. The NAS box runs ProFTPD.

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  • What is the best Linux filesystem for MySQL (InnoDB)?

    - by Continuation
    I tried to look for benchmark on the performances of various filesystems with MySQL InnoDB but couldn't find any. My database workload is the typical web-based OLTP, about 90% read, 10% write. Random IO. Among popular filesystems such as ext3, ext4, xfs, jfs, Reiserfs, Reiser4, etc. which one do you think is the best for MySQL?

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  • http in web browser address bar

    - by Kumar P
    If we type a domain name in web browser address bar, How it will be add default ? Ex. If i type linkedin.com in web browser address bar, How it will be add www and http:// ----- http://www.linkedin.com/ ....... If i didn't mention ftp also it will add automatically add ftp://...... Based on what concept, it will work. I know it basic and simple question. But please tell about it as clear as possible

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  • Connecting to a switch?

    - by Kravlin
    I have a managed switch that i liberated from our school's surplus goods store for $10 that has a serial based console. I have a serial cable and a computer with a serial port, but i have no idea what protocal to use to connect between the two. I'm running Arch Linux on the computer with the serial port. Thanks

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  • few questions on packet sniffer/analyzer

    - by user37652
    I have few questions about packet sniffer. I'm using a zyxel p-600 series modem and a hub to distribute the internet connection. Can I use a packet sniffer here to determine if the user is downloading something? Can I determine if the user is downloading a file based on the modem alone.(The lights blink faster) Is there an application that I could use for the modem or the hub to limit or avoid direct downloads. Details: OS: Ubuntu 9.10 and Windows 7

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  • Monitor uSWGI via Nagios: invalid socket

    - by webjay
    I'm trying to monitor uSWGI via Nagios, but according to uWSGI I have specified an invalid socket. The socket path I got from the JSON config file which also says chmod-socket: 666 so I have a hunch that the problem is permission based. The socket file is owned by www-data who I don't want to tinker with, so any other ways? uwsgi --socket=/tmp/app.sock --nagios detected binary path: /usr/local/bin/uwsgi UWSGI UNKNOWN: you have specified an invalid socket ls -l /tmp/app.sock srw-rw-rw- 1 www-data www-data 0 2012-10-26 17:00 /tmp/app.sock

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  • Quick-n-Easy way to remove outdated ActiveDirectory users?

    - by Jason Taylor
    We have around 70 current employees, but 178 accounts in ActiveDirectory. The prior administrators never removed old accounts, and sometimes they weren't even disabled. As it is, I am considering manually reviewing each account to determine if it can be removed. Is there an easier way to remove accounts based on a condition? Such as, remove (or at least disable or flag in some way) users that haven't logged in within the last month or so?

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  • Timezone reset on Amazon AMI update

    - by Jeff
    I have a server set up through Amazon AWS. It's Amazon's RHEL-based AMI. When I initially booted up the machine, I set the proper timezone by creating a symlink: ln -sf /usr/share/zoneinfo/America/Los_Angeles /etc/localtime This works just fine, but whenever Amazon provides an update to their AMI the timezone automatically reverts to UTC. Is there a way around this or does it have to be manually set after each update?

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  • How do software .dmg files mount or work in OS X?

    - by ymasood
    I am a new Mac user and have an iMac. Coming from the Windows world where everything is installer based, OS X seems to mount .dmg files and run them. I've seen this happen prior to an install and later it requests us to move an icon to the Applications folder. Could someone help me unclutter the install process on OS X. What or how does it work? Thanks in advance!

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  • iis7 bandwith throttling for downloads via iis media services?

    - by MikeJ
    I am looking after a sever that is managing the downloads of software updates released by the company where I work. The throttle in IIS7 seems to limit the total rate and not the rate each individual download gets. I was thnking on installing media services, adding .zip as a type and then throttling the individual connection rate based on what I read. Is this how this sort of thing is done with IIS7?

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  • WinXP 64bit cannot see files on dfs

    - by Kvad
    Hi, I have Server1 Win2008 Storage Server Running DFS Access-based enumeration - off Offline settings - disabled Workstation1 WinXP SP3 32bit Workstation2 WinXP SP2 64bit I have a shared folder on Server1 on the DFS share. Workstation1 can see all files and folders. Workstation2 does not. I have tested with multiple WinXP 64bit PCs and the same files across these machines do not show up. Going directly to the files via the address bar works.

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  • Rocksclusters reinstalling nodes partitioning error.

    - by Antiarchitect
    I have a HPC based on rocksclusters So when I've added new roll (torque) I send a kickstart command to all nodes to reinstall them. But after loading X installer on nodes all of them showed me an error: Could not allocate requested partitions: Partitioning failed: Could not allocate partitions as primary partitions. Cannot allocate partition for /boot

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  • Getting Classic ASP to work in .js files under IIS 7

    - by Abdullah Ahmed
    I am moving a clients classic asp webapp to a new IIS7 based server. The site contains some .js files which have javascript but also classic asp in <% % tags which contains a bunch of conditional statements designed to spit out pieces of javascript based on session state variables. Here's a brief example of what the file could be like.... var arrHOFFSET = -1; var arrLeft ="<"; var arrRight = ">"; <% If ((Session("dashInv") = "True") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4"))) Then %> addMainItem("/MgmtTools/WelcomeInventory.asp?wherefrom=salesMan","",81,"center","","",0,0,"","","","",""); <% Else %> <% If (Session("dashInv") = "False") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4")) Then %> <% Else %> addMainItem("/calendar/welcome.asp","",81,"center","","",0,0,"","","","",""); <% End If %> <% End If %> defineSubmenuProperties(135,"center","center",-3,0,"","","","","","",""); Currently this file (named custom.js for example) will start throwing js errors, because the server doesnt seem to recognize the asp code in it and therefore does not parse it. I know I need to somehow specify that a .js file should also be treated like an .asp file and run through parsing it. However I am not sure how to go about doing this. Here is what I've tried so far... Under the Server node in IIS under HANDLER MAPPINGS I created a new Script Map with the following settings. Request Path: *.js Executable: C:\Windows\System32\inetsrv\asp.dll Name: ASPClassicInJSFiles Mapping: Invoke Handler only if request is mapped to : File Verbs: All verbs Access: Script I also created a similar handler under the site node itself. Under MIME Types .js is defined as application/x-javascript None of these work. If I simply rename the file to have .asp extension then things work, however this app is poorly coded and has literally 100's of files with the .js files included in them under various names and locations, so rename, search and replace is the last option I have.

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  • GUI to Change the Login Screen Wallpaper Image on Snow Leopard

    - by lexu
    the "standard" login screen background on OSC (Leopard and Snow Leopard) can be modified using these command line incantations: cd /System/Library/CoreServices sudo mv DefaultDesktop.jpg DefaultDesktop_org.jpg sudo cp /path/of/image.jpg DefaultDesktop.jpg I learned that here QUESTION: is there a GUI based utility for people like my wife and daughter? .. they DO want to customize (worse: they want me to do it ), but they DON'T want to learn the terminal ( since I know how). They DO know how to enter an admin's credentials when prompted.

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