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  • Debugging IO limitation

    - by Martin F
    I have a Fedora box with some severe IO limitations which I have no idea how to debug. The server has a Areca Technology Corp. ARC-1130 12-Port PCI-X to SATA RAID Controller with 12 7200 RPM 1.5 TB disks and a Marvell Technology Group Ltd. 88E8050 PCI-E ASF Gigabit Ethernet Controller. uname -a output: 2.6.32.11-99.fc12.x86_64 #1 SMP Mon Apr 5 19:59:38 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux The server is a file server running Nginx with the stub status module enabled, so I can see the current amount of connections. The problem present itself when I have a high number of simultaneous connections in a writing state. Usually around 350, at this very moment it's at 590 and the server is almost unusable and stuck at 230mbit/s. If I run stop and hit 1 to see CPU core usages I have all 4 cores with around 99% io wait, if I run iotop the nginx workers are the only processes producing any read load, currently at around 25MB/s. I have each of the workers bound to their own core. Initially I figured it was just the disks being bugged. But I've run fscheck and smartmontools checks and found no errors. I also ran an iozone test which you can see the result of here: http://www.pastie.org/951667.txt?key=fimcvljulnuqy2dcdxa Additionally, when the amount of connections are low I have no problem getting a good speed. If I wget over the local network it easily hits 60MB/sec. Right now I just tried putting a file in /dev/shm, then I symlinked a file from the public dir to it and used wget over the local network and only got 50KB/s. Also, if I try to cp /dev/shm/test /root/test it quickly copies around 740MB and then slows down HEAVILY. Again with iotop reporting 99% iowait. I'm not really sure how to go about figuring out what the problems are. It could be a natural disk limitation but then the file from /dev/shm ought to transfer so it seems there's a network limit, but that's fine when there's not many connections. Perhaps it's a TCP stack problem but I really have no idea how to check that. Any suggestions on how to proceed with debugging would be very welcome. If additional information is required then let me know and I'll try to get it. Thanks.

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  • Choosing my first Domain Registrar?

    - by user36914
    This will be the first domain i've ever registered. So i'm at a loss what to look for. I definitely don't want to go with GoDaddy. Here are my requirements: Must have unlimited email forwards for my domain Easy to transfer away if i choose. Must not be one of those shady registrars that will try to auction your domain at the end. Ability to create sub domains Domain Registration is Private I would like a domain registrar that would let me use my dynamic ip of my ISP (Cable) if i want to. So hopefully they would have some type program that would detect IP changes and update accordingly So i've looked at a variety of registrars so far. The three left were really NameCheap, DreamHost, & DomainMonster. I have heard good things about DreamHost but i think its off the list because they don't give you any information about the features you get when you register your domain with them. They have a "Whats included" button the page but it mainly list the features with hosting not registration. DomainMonster looks pretty cool but i don't see anything about subdomains. Also i would assume they don't have a system for dynamic ip address updating. So you would have to constantly check that your ip of your ISP has changed or not and update it manually. NameCheap also looks nice. There are two things i really like about them. Right on their feature page they list "Free Dynamic DNS With Client" which is pretty cool. They also have a free SSL certificate for the first year. Haven't messed a lot with certificates but this would definitely be something i would use. Only minus i can see is you only get free private whois for the first year. After that its $2.99 which isn't that big of a deal. I'm leaning towards NameCheap now. Is this a good choice. Is there anything else i should be looking at?

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  • Networking Mac and PC - Firewall Issue?

    - by zm15
    Here's the scenario: Work network - I have a Mac and a PC - OS X is Snow Leopard - Windows 7 I am trying to connect to the PC from the Mac. IT ONLY works if I turn off the firewall in Windows. I tried to trace the port and connection it was using, it appears to be on port 445 via TCP. I really prefer not to leave this open, or is it OK? How can I only allow this connection while still leaving the firewall on?

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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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  • How to know when the kernel was last compiled?

    - by Mehmet Tuncal
    I have installed a linux distro and I "think" it is vulnerable to kernel exploits. I have to update kernel but I need to know if it is really compiled in year 2003? How can I know if additional updates are made to the kernel? Linux gandalf 2.4.21-4.ELsmp #1 SMP Fri Oct 3 17:52:56 EDT 2003 i686 i686 i386 GNU/Linux Does also "smp" mean that it is safe from latest threats or something? Thank you.

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  • Good text editor for OS-X?

    - by Cyrcle
    I'm considering getting a Mac. I want to make sure I'll be able to get a good text editor for it. I'm wondering what other folks are using. Features I need - Contextual highlighting for PHP, HTML, CSS, and preferably many others FTP from a hotkey - so I can hit ctrl-s to save, then another combo to FTP it. Features I'd like - Code Completion I'm also interested in any comments in general about coding on a Mac and if it's really worth the extra $$$ to get one. Thanks

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  • Which mouse for preventing carpal tunnel/RSI symptoms?

    - by user102533
    I started getting carpal tunnel symptoms about a year back and have tried different mice/keyboards and nothing seems to help. When my right wrist (i am right handed) started giving me pain, I switched from a regular optical mouse to this logitech mouse: It helped for a short while. I then started to learn using my left hand to operate the mouse. Now, my left wrist has started experiencing the symptoms. Which mouse do you recommend that has really helped you?

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  • Ubuntu 9.10: how do I troubleshoot a startup script that doesn't appear to run?

    - by TheDeeno
    I've created a bash script 'foo'. I've made that script executable with chmod+x and added it the the start-up by running sudo update-rc.d foo defaults 80 Despite that, it doesn't appear to be working at startup. Is there a way to have my script echo messages to a log? Or is there some log that would record events/errors for this? atm, I feel like I'm flying blind and don't really know how to troubleshoot this.

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  • Open source calendar software allowing sync with Iphone?

    - by Jared
    I'm looking for something I can install on a Linux server to create a remote calendar that I can sync with my iphone. Anything requiring setting up an exchange server on the Iphone is out since I already have one set up for work. I'd like to avoid a groupware package since all I really want is a calendar.

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  • How does a so-called "LED monitor" work?

    - by sharptooth
    Every here and there I hear about new LED monitors. I imagined that they were really LED monitors - that their screens were formed of multiple tiny LEDs that lit up in a controlled manner to form an image. Yet turns out they are LED backlit LCD monitors. What's the difference between this and a trusty Belinea 10 17 51 I've been using for the five years already?

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  • Excel 2007: what happened to the Auto Expand Selection tool?

    - by Erik Olson
    Older versions of Excel had a icon that would expand the selection to include any non-empty cells in all directions. It was an X shape with four arrowheads. You can still write VBA code to do this, but I really miss this tool. Did they just drop it from Excel 2007? In older versions you had to go get it from the Customize menu because it wasn't on any toolbar by default.

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  • Multiple "from" addresses for single Exchange account in Outlook 2007

    - by Jørn Schou-Rode
    I have a single Exhange account with multiple aliases (e-mail addresses), for which it recieves incoming mail messages. Using "rules" it is possible to have the incoming messages sorted into folders depending on the address they are sent to. When composing and sending messages from Outlook, the primary address of the exchange account is used in the "From" header. Without adding additional mail accounts (I really only have one), is it possible to learn Outlook about the alias addresses, making them available as "From" addresses when composing new messages?

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  • Migrate OS Install to VMWare Virtual Machine

    - by rockinthesixstring
    I have Windows Server 2003 installed on my server. I'd really like to be running it via VMWare EXSi as a virtual machine, but I don't what to have to reconfigure the whole deal. Is there a relatively painless way to move it to a virtual machine? It will be staying on the same box with the exact same hardware... nothing changes. Thoughts?

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  • Is it generally a bad idea to have other types of virtual appliances installed along side a firewall

    - by MGSoto
    I want to run my Firewall/NAT software (pfsense) and an internal NAS (looking at freenas right now) for my SOHO on one machine. Right now I have them separated on two different machines, but I'd like to consolidate them. Is this generally a bad idea? I see the security concern where if the firewall or host OS is compromised, then your data is essentially screwed. But is it really a concern for me?

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  • BSD route(8) MAN page bug

    - by Farseeker
    http://www.freebsd.org/cgi/man.cgi?query=route Route is a utility used to manually manipulate the network routing tables. It normally is not needed, as a system routing table management daemon such as routed(8), should tend to this task. ... BUGS The first paragraph may have slightly exaggerated routed(8)'s abilities. Is this really a "bug", or some developer's attempt at humour?

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  • Vmware - How do i config a host-only network

    - by nXqd
    The understanding about Host-only: I use VMware 7, Vmnet1 is the host-only adapter for host and it's IP is 192.168.209.1 . I'm really confused about this , does it connect to Vmnet 1 switch and Vmnet has DHCP also, it provieds IP range: Why it has virtual host adapter ( Vmnet 1) has IP which isn't in range while it's just an adapter in virtual network, it connects through switch Vmnet like the guest adapter Waiting for your answers , thanks in advance :)

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  • Postfix: Relay access denied

    - by Joseph Silvashy
    When I telnet to my server thats running postfix and try to send an email: MAIL FROM:<[email protected]> #=> 250 2.1.0 Ok RCPT TO:<[email protected]> #=> 554 5.7.1 <[email protected]>: Relay access denied I couldn't really find the answer on the site or by looking at other users question/answers, I'm not sure where to start. Ideas? Update So basically looking at the docs: http://www.postfix.org/SMTPD_ACCESS_README.html (section: Getting selective with SMTP access restriction lists), I don't seem to have any of those directives in etc/postfix/main.cf like smtpd_client_restrictions = permit_mynetworks, reject or any of the other ones, so I'm quite confused. But really I'm going to have a rails app connect to the server and send the emails, so I'm not sure how to handle it. Here is what my config file looks like: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = rerecipe-utils alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = $myhostname, localhost.$mydomain, localhost, mail.rerecipe.com, rerecipe.com relayhost = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all mynetworks = 127.0.0.0/8 204.232.207.0/24 10.177.64.0/19 [::1]/128 [fe80::%eth0]/64 [fe80::%eth1]/64 Something to note is that relayhost is blank, this is the default configuration file that was created when I installed Postfix, when testing to connect with openssl I get this: ~% openssl s_client -connect mail.myhostname.com:25 -starttls smtp CONNECTED(00000003) depth=0 /CN=myhostname verify error:num=18:self signed certificate verify return:1 depth=0 /CN=myhostname verify return:1 --- Certificate chain 0 s:/CN=myhostname i:/CN=myhostname --- Server certificate -----BEGIN CERTIFICATE----- MIIBqTCCARICCQDDxVr+420qvjANBgkqhkiG9w0BAQUFADAZMRcwFQYDVQQDEw5y ZXJlY2lwZS11dGlsczAeFw0xMDEwMTMwNjU1MTVaFw0yMDEwMTAwNjU1MTVaMBkx FzAVBgNVBAMTDnJlcmVjaXBlLXV0aWxzMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCB iQKBgQDODh2w4A1k0qiPNPhkrPj8sfkxpKPTk28AuZhgOEBYBLeHacTKNH0jXxPv P3TyhINijvvdDPzyuPJoTTliR2EHR/nL4DLhr5FzhV+PB4PsIFUER7arx+1sMjz6 5l/Ubu1ppMzW9U0IFNbaPm2AiiGBQRCQN8L0bLUjzVzwoSRMOQIDAQABMA0GCSqG SIb3DQEBBQUAA4GBALi2vvk9TGKJubXYJbU0PKmVmsfzFK35yLqr0keiDBhK2Leg 274sWxEH3ds8mUaRftuFlXb7RYAGNlVyTuMTY3CEcnqIsH7F2McCUTpjMzu/o1mZ O/B21CelKetBd1u79Gkrv2vWyN7Csft6uTx5NIGG2+pGi3r0gX2r0Hbu2K94 -----END CERTIFICATE----- subject=/CN=myhostname issuer=/CN=myhostname --- No client certificate CA names sent --- SSL handshake has read 1203 bytes and written 360 bytes --- New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA Server public key is 1024 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : DHE-RSA-AES256-SHA Session-ID: 1AA4B8BFAAA85DA9ED4755194C50311670E57C35B8C51F9C2749936DA11918E4 Session-ID-ctx: Master-Key: 9B432F1DE9F3580DCC6208C76F96631DC5A4BC517BDBADD5F514414DCF34AC526C30687B96C5C4742E9583555A118232 Key-Arg : None Start Time: 1292985376 Timeout : 300 (sec) Verify return code: 18 (self signed certificate) --- 250 DSN Oddly enough when I try to send an email from the machine itself it does work: echo test | mail -s "test subject" [email protected]

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  • textmate - change cursor color

    - by w-
    i'm using a theme for textmate which i really like but the cursor color is almost invisible. how do i change the color of the cursor? looking at the preferences, i don't see an option to change the color of the cursor. anybody have any suggestions? thanks

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  • Post picture to TwitPic using Tweetie 2

    - by David Thomas Garcia
    This is so embarrassing. I'm usually really good at figuring out software, especially iPhone apps. Heck, I write software myself! But for the life of me I cannot find a place in Tweetie 2 to post a picture to TwitPic. I assume there is a way to do this, can anyone provide step-by-step directions for me?

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