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• Hardware freeze during disk activity

  - by Thomi

  I built myself a linux-based NAS. It has several drives of various sizes and ages in an LVM configuration, with 800GB or so of data. The data is served using a simple samba server. This was working flawlessly, but after physically moving it, it has developed a strange fault: Whenever I do something on the server to cause disk activity, the entire machine freezes hard. This has the effect of killing any open network connections to the box, and generally making it useless. If I leave the machine for a few minutes it seems to come right again, but obviously this isn't really a solution. There are no error or warning messages in syslog, or the kernel logs. If I power the machine on, and leave it, it runs for several days without locking up. After that time I stopped testing. It doesn't freeze instantly - obviously it doesn't freeze while booting, and I can normally log in via SSH and start poking around in a few log files for a couple of minutes before it dies. My question is: What diagnostic tests can I run to determine the casuse?

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• Dynamically blocking excessive HTTP bandwidth use?

  - by Jeff Atwood

  We were a little surprised to see this on our Cacti graphs for June 4 web traffic: We ran Log Parser on our IIS logs and it turns out this was a perfect storm of Yahoo and Google bots indexing us.. in that 3 hour period, we saw 287k hits from 3 different google ips, plus 104k from yahoo. Ouch? While we don't want to block Google or Yahoo, this has come up before. We have access to a Cisco PIX 515E, and we're thinking about putting that in front so we can dynamically deal with bandwidth offenders without touching our web servers directly. But is that the best solution? I'm wondering if there is any software or hardware that can help us identify and block excessive bandwidth use, ideally in real time? Perhaps some bit of hardware or open-source software we can put in front of our web servers? We are mostly a windows shop but we have some linux skills as well; we're also open to buying hardware if the PIX 515E isn't sufficient. What would you recommend?

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• Dell Latitude D510 Runs From Battery But Not AC Adapter

  - by Jason George

  I have a Dell Latitude D510 that went belly up around two years ago. It will run from the battery, however, the wall adapter will neither power the machine nor charge the battery. Once the battery is dead, the machine is dead. Since it died I've searched repeatedly for solutions. I've tried a new AC adapter and even removed and replaced the DC jack thinking one of the solder joints might be bad. Both to no avail. After two years of searching I finally found the answer today. Since it's such a simple fix and I had such a hard time finding it I wanted to post the info for others (as it is apparently a common issue with the D510). -----SOLUTION----- It seems this is commonly caused by a cracked solder joint at pin 1 on an inductor filter pair (FL2) near the power jack. Pins 1 and 4 are ground and pins 2 and 3 are power. There should be 20V from 1 to 2 and 3. Anything less indicates a cracked joint that is increasing resistance and dropping the supply voltage. Repair simply requires reflowing all four pins with a little added solder for security. Detailed instructions can be found here. Dell Latitude D510 solder problem

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• Best all in one linux based proxy,firewall, dhcp and wins server.

  - by BeStRaFe

  I help to run a lan in Sydney. We have a need for a proxy/gateway solution to allow those pesky games that require internet to work. I have been doing this with an ISA server and it has worked quite well. However now i wish to port this over to run on the same hardware as our cacti / nagios box under a vmware VM. ISA server is horridly nad due to the massive ram and i/o requirement for something is basically port blocking and handing out IP's. The needs are as follows. 1. DHCP 2. WINS (otherwise network devices fight over who is the WINS master) 3. Filtering based in PORT for outbound traffic. 4. Ability to whitelist IP/MAC's for internet access. 5. Web Interface. I had been thinking to use PFSENSE however there is no option for a WINS server and i cbf working my way around bsd.

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• HP Photosmart C4780 printer/scanner breaks netgear WNDR3700v3 router on connection

  - by CodeJunkie

  A few months ago, we upgraded our Netgear router's firmware. Immediately, we started having trouble connecting to the internet. Each time this problem would happen, every device in the house would stop being able to make new connections to the internet. For example, you couldn't open new pages in the browser, but if Skype was running when the problem happened, you could keep talking to people. The only solution to this problem seemed to be resetting the router to factory defaults. Eventually, we solved this problem by just downgrading the router firmware. A while later, we got a new Netgear router. Almost right away, the new router started having exactly the same problems as the old one did on current firmware. The network connection would stay active and the computer would say it had an internet connection, but you couldn't do anything online except for using Skype. We eventually figured out that this happens every time our HP printer gets onto the network. Any time the printer gets onto the wireless network, the whole network stops connecting to the internet almost completely. The only thing that will fix it at that point is to reset the router to factory specs, and unplug the printer so it can't get back onto the network. The Netgear router has the latest version of the firmware, but the printer/scanner is very old. It looks to me like this problem is probably a result of a firmware conflict between the printer and the router, but I'm not sure how to fix that problem. Here's some additional information: Printer: HP Photosmart C4780 Router: WNDR3700v3 Router firmware: V1.0.0.22_1.0.17 (Stock, up to date firmware) Why would the printer getting on the network cause the router to not be able to access the internet correctly until it was reset? What can be done to allow the printer to be on the network without breaking the network for all other devices? Edit: One other thing that happens during this internet problem is that multiple computers in the house display an "IP conflict" message repeatedly, and extremely frequently (as often as every five to ten minutes, and every time a connection to the wireless is made).

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• Linux - preventing an application from failing due to lack of disk space [migrated]

  - by Jernej

  Due to an unpredicted scenario I am currently in need of finding a solution to the fact that an application (which I do not wish to kill) is slowly hogging the entire disk space. To give more context I have an application in Python that uses multiprocessing.Pool to start 5 threads. Each thread writes some data to its own file. The program is running on Linux and I do not have root access to the machine. The program is CPU intensive and has been running for months. It still has a few days to write all the data. 40% of the data in the files is redundant and can be removed after a quick test. The system on which the program is running only has 30GB of remaining disk space and at the current rate of work it will surely be hogged before the program finishes. Given the above points I see the following solutions with respective problems Given that the process number i is writing to file_i, is it safe to move file_i to an external location? Will the OS simply create a new instance of file_i and write to it? I assume moving the file would remove it and the process would end up writing to a "dead" file? Is there a "command line" way to stop 4 of the 5 spawned workers and wait until one of them finishes and then resume their work? (I am sure one single worker thread would avoid hogging the disk) Suppose I use CTRL+Z to freeze the main process. Will this stop all the other processes spawned by multiprocessing.Pool? If yes, can I then safely edit the files as to remove the redundant lines? Given the three options that I see, would any of them work in this context? If not, is there a better way to handle this problem? I would really like to avoid the scenario in which the program crashes just few days before its finish.

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• Define custom escape sequences in terminal

  - by Ipkiss

  I would like to change the escape sequences used by some keys in my terminal. My goal is to define custom mappings in Vim (terminal version). In the following I use shift-space as an example, but I would prefer if the proposed solution could be generic. My current terminal (gnome-terminal) uses a simple space as escape sequence for shift-space, as can be seen by typing ctrl-v shift-space. A quick check with the true xterm shows the same behavior. I would like that the shift-space key combo generates another escape sequence (e.g., the one of shift-F30, which I would never use otherwise). So, how would I go about doing that? And is it really a good idea? Let me know if there are better alternatives... Note: I'm aware that this is only part of the problem: after the terminal sends a proper escape sequence for my keys, I still need to teach Vim what it means. But I think I know how to deal with that.

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• Symantec NetBackup restore - Incremental backup

  - by w0051977

  We are using Net Backup as a corporate solution. Incremental backups are taken daily during the week and then a weekly backup is done at the weekend (Saturday). My colleague has restored a folder to how it stood at 14:00 on a Tuesday. The problem is that the restore is taking files from the weekend backup if they did not exist at that point in time of the restore. For example, the folder we are restoring should look like this (this is how it looked on Tuesday at 14:00): Folder1 (folder name) Test.txt Test1.txt Test2.txt The folder looked like this at the weekend when the full restore was done (even though it did exist at the weekend when the full backup ran): Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt The actual folder restored looks like this: Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt Test3.txt should not be restored because it did not exist at the point of the restore. Is there a setting somewhere that we are missing. The folder in question is 200GB - the example above is for simplification. I realise this is a basic question.

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• Require a very simple bash-based webserver for logging XML POST [on hold]

  - by Syffys

  As in title, it's for testing purpose and I need it to be extremely light (1 line to 1 single light file). Here is a XML query sample: XML_QUERY=$(cat <<EOF <?xml version='1.0' encoding='UTF-8'?> <Test></Test> EOF ) curl -H "Content-type: text/xml; charset=utf-8" -H "Soapaction: \"\"" -k -d "${XML_QUERY}" http://localhost:8088 Here are some of the tracks I have found so far even if I wasnt able to adapt them to work as I expect: Netcat minimal webserver: Problem is that my nc does not have the -q option, so the connection is closing before delivering the XML content Netcat Only webserver: Same as above Thanks in advance! EDIT: As it's been asked, I'm running Linux Redhat, even if the distro does not really matter and the OS implied since I'm asking a bash-based solution... Also about my topic being on hold: "Instead, describe your situation and the specific problem you're trying to solve" = I though this was exactly what I was doing, but ok I'll reword: My situation: bash environment (which can also include some standard linux tool: netcat, python or whatever) My specific problem: please see title: Require a very simple bash-based webserver for logging XML in HTTP POST for testing purpose

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• Terminate child processes on ctrl-c

  - by jackweirdy

  In tiny core linux, I have the following script: #!/bin/sh # ~/.X.d/freerdp.sh rdp(){ while true do xfreerdp -f [IP Address] done } rdp & It's pretty simple; when X starts up and checks the .X.d directory (as is the case in tiny core) it finds and executes this script. The script starts up freerdp and keeps a connection open to the server by restarting it whenever it closes. As you can see from the rdp & line, the function is run in the background to allow X to continue its startup routine. The problem is that whenever I cancel X with a Ctrl-Alt-Backspace the rdp process doesn't die. I'm looking for a way to kill the process as soon as X finishes, either through: A) a script, executed on X closing, which kills the process or B) by modifying the script to check the return value of the xfreerdp command. NB - if the solution does check the return value, it must only end if the command fails to open the X display. For that reason, if you could point me to a reference for xfreerdp return values I'd be grateful.

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• How do I replicate Gmail filtering (forwarding mostly)?

  - by projectdp

  I have reached the limits of Gmail forwarding. Before there was no need to verify forwarding addresses. It's a problem for me now because the addresses I want to forward to are not natural inboxes but automated systems with no way to track the verification email contents. I want to set this up for example: mobile - email - facebook-email - flickr-email - tumblr-email - posterous-email How do I do this without Gmail filters? I think I need to use fetchmail to watch my inbox and then autoforward to the above addresses. Is fetchmail the best solution to this issue? Any other MRA's? I'd like to do some more complicated things with the emails in an automated fashion too, how would I go about monitoring the inbox, doing some actions to the email before forwarding, and forward everywhere? prerequisites: a server: fetchmail daemon to poll the account local mailbox script to clean & forward appropriately (python probably) sendmail + ~/.forward file backup email account (Gmail probably) Any help would be greatly appreciated. I'm trying to automate my social content distribution.

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• Any program to help me check whether an ethernet channel can support full-length VLAN packet?

  - by Jimm Chen

  Sometimes, I have to face such a situation that I need to quickly and explicitly know whether a full length VLAN packet can traverse between two RJ45 ports. Yes, I mean 802.1Q ethernet frame with Etype=81 00 (diagram below). What I can do now is: Get two Windows PCs, for each PC, intall Intel Gigabit NIC and Intel specific driver to create a virtual NIC, with VLAN ID=3 assigned. Then connect the two PCs to each of the two RJ45 port. Finally execute ping to generate a full-length ethernet packet. ping -f -l 1472 <dest-IP> This way, I can be sure that the sent packet has the maximum "IP data payload" of 1500 bytes(8 bytes of ICMP header and 1472 bytes of ICMP data). If the ping gets reply, I know that the ethernet channel support full-length VLAN packet. From my experiment, some home switch or broad band routers(e.g. Linksys WRT54G) does not support full-length VLAN packet switching, so only ping -f -l 1468 succeeds. You see, I have to use an expensive Intel NIC to carry on that test, quite inconvenient. You know, for most laptop today, they do not equip an Intel NIC, and, even it is an Intel NIC, Intel VLAN driver, Intel has limitations on the models on which VLAN driver can be installed. So, my question is: Is there a small program that can let me send a full-length VLAN packet without installing a dedicated VLAN driver? Or better, the program has a stock feature that does the very job for my situation. Windows programs preferred, Linux solution welcome. Simpler the program, the better. Thank you.

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• Computer sending data while turned off

  - by Nicklas Ansman

  I have a some what strange problem (which could have and easy and obvious solution for all I know). My problem is that when I've booted ubuntu (now 10.4 but same problem with 9.10) and turns it off it starts sending a HUGE amount of data via the ethernet cable, so much in fact that my router can't handle it and stops responding. As far as I can tell the computer is completely turned off with no fans spinning. I can add that if I boot windows I do not have this problem, just when exiting ubuntu. There are two "fixes" for my problem: Pull the ethernet cable until the next boot Turn off power to the PSU and wait for the capacitors to unload Is there anyone who knows what could be going on? I'd be happy to post some logs or conf-files. Currently I'm using the ethernet port on my motherboard which is a Asus P6T Deluxe V2 with an updated version of the BIOS (maybe not the latest but since it only happens when I've been in ubuntu I don't wanna mess with the BIOS too much). Regards Nicklas ---------Update 1---------- The router is a D-Link DIR 655 with the latest firmware. ---------Update 2---------- I've now reinstalled ubuntu (with 10.4) and I still experience the same problem.

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• Unable to connect to FTP - Connection timeout after MLSD

  - by Afrosimon

  So here is my problem, I'm absolutely unable to connect to a FTP server, in circumstances I've never seen before. Here is the situation : I get a "Connection timed out" just after the MLSD command. I usually use Filezilla, under Ubuntu, but to make sure the problem isn't related to this particular client I tried a few others : gftp on ubuntu and winscp and freeftp on windows 7. All the same result. Also made sure to try with Active or Passive modes. Same result. At this point I would be inclined to think there is something wrong with my current network (furthermore, according to a coworker the FTP server is OK). But I did check with http://ftptest.net/ and I am able to get the directory listing (which I'm not able to through a FTP client). So in the end the last thing I didn't tried is to go on another network, solution which seems would work, but wouldn't be very practical in the long run. And thus I guess there's something wrong with my router... but what could it possibly be? Note : I did try to register and post this question on filezilla's board first... but I can't create an account with a gmail nor hotmail account. WTF?

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• MS Excel 2010 - Using DSN + 32 bit drivers

  - by Kristiaan

  I need some advice as im running into a problem and so far i have been unable to find a solution. We have a set of reports developed in MS Excel that use DSN file to connect to data sources to retrieve data, these work fine on 32 / 64bit systems, however we are moving to a terminal server environment using windows 2008 R2 64Bit. The reports fail to run using the DSN's within this environment if we only have the 32bit drivers installed and configured in the ODBC settings, the minute we install the 64Bit drivers the software works. Is there a way / Method of getting Excel or the DSN file to NOT use the 64Bit driver, but force it to use the 32bit driver. ANSWERED - But due to low user score i cannot "answer" my own question... Sadly there is no way to-do what i want to-do, without a lot of very nasty and not 100% perfect reg hacks. If you need to access 32bit ODBC data sources the application in question has to be 32Bit. here is a link to just one forum post i found relating to this type of problem, it appears the only way i would be able to accomplish this is to remove the 64bit version of office and install the 32bit version instead of it. http://social.msdn.microsoft.com/Forums/en-US/accessdev/thread/5108f337-f06a-4518-afe3-d3c1abd040ef/

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• Printing on Remote Desktop session

  - by Arindam Banerjee

  We have to connect a Windows 2008 server using Remote Desktop from Windows XP machine. A Barcode Printer is attached with XP machine and the printer is shared as Local Resource in RDC session to the server. On the server we have to print from an application which prints either to LPT port or shared printer (UNC path). For this I use to configure print pooling combining LPT1 and (Terminal Server) TSxxx port. As I don't know the option to access the Terminal Session printer via UNC path. But I have the following issues - Every time I connect to a remote session, the printer from my local Win XP machine is showing in Printers and Faxes on Win 2008 Server (Terminal Server), but I am not allowed to manage the Win XP printer from Terminal Server to enable pooling. On the server I have to change the security permission every time and then enable print pooling. How can I keep the security permission unchanged? Secondly I created a batch file to enable print pooling. rundll32 printui.dll,PrintUIEntry /Xs /n "Printer (from CLIENT)" Portname "LPT1:,TS005" But every time the printer in terminal session connects in diffrent terminal Session port. Any solution to make the TS port fixed? Help from anyone will be highly appreciated.

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• Running Visual Studio 2010 in a University Campus

  - by Woondows

  We have just installed Windows 7 Enterprise x64 in one of our computer labs being used by students for programming. However, when we installed Visual Studio 2010 Ultimate on the machines, we found that to even launch the application (devenv.exe), required the student to enter the administrator password (the usual UAC prompt). Of course, we could just turn off UAC, but that would defeat the purpose of having it in Windows 7. On the other hand, we cannot really give the students local administrator privilege, as we are concerned that they will do some malicious stuff on the computers. Previously when we used Windows XP Professional running Visual Studio 2005, we had no problems. Kindly advise if there's any workaround for this. EDIT: Thanks for the answer guys. Mayank, your links may work for Visual Studio .Net, but it doesn't seem to work for Visual Studio 2010. Ryan, Tieson, I'm intrigued that you guys managed to get it working easily. FYI I don't manage the Group Policies, but I can get them changed if necessary. Any particular GP that I should be looking at? Suggestions to how to troubleshoot further why UAC is being invoked? At least now I know for sure that this is not supposed to be the default behaviour for Visual Studio 2010 so I'm going to keep digging for a solution. Will try running Procmon and see if i can find something..

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• Index a low-cost NAS on Windows 7

  - by JcMaco

  Has anyone found a way to index the files stored on a Networked Attached Storage on Windows 7 so that the files can be available in Windows Search and Libraries? I am referring to the cheap and available NAS like the Western Digital My Book series that use an embedded linux server. Similar question: http://windows7forums.com/windows-7-networking/6700-indexing-nas-drive-libraries.html EDIT Windows help proposes to make the files stored on the NAS available offline. This is obviously not a good solution if the NAS has more data than what the client can store. If the folder is on a network device that is not part of your homegroup, it can be included as long as the content of the folder is indexed. If the folder is already indexed on the device where it is stored, you should be able to include it directly in the library. If the network folder is not indexed, an easy way to index it is to make the folder available offline. This will create offline versions of the files in the folder, and add these files to the index on your computer. Once you make a folder available offline, you can include it in a library. When you make a network folder available offline, copies of all the files in that folder will be stored on your computer's hard disk. Take this into consideration if the network folder contains a large number of files.

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• Standards for documenting/designing infrastructure

  - by Paul

  We have a moderately complex solution for which we need to construct a production environment. There are around a dozen components (and here I'm using a definition of "component" which means "can fail independently of other components" - e.g. an Apache server, a Weblogic web app, an ftp server, an ejabberd server, etc). There are a number of weblogic web apps - and one thing we need to decide is how many weblogic containers to run these web apps in. The system needs to be highly available, and communications in and out of the system are typically secured by SSL Our datacentre team will handle things like VLAN design, racking, server specification and build. So the kinds of decisions we still need to make are: How to map components to physical servers (and weblogic containers) Identify all communication paths, ensure all are either resilient or there's an "upstream" comms path that is resilient, and failover of that depends on all single-points of failure "downstream". Decide where to terminate SSL (on load balancers, or on Apache servers, for instance). My question isn't really about how to make the decisions, but whether there are any standards for documenting (especially in diagrams) the design questions and the design decisions. It seems odd, for instance, that Visio doesn't have a template for something like this - it has templates for more physical layout, and for more logical /software architecture diagrams. So right now I'm using a basic Visio diagram to represent each component, the commms between them with plans to augment this with hostnames, ports, whether each comms link is resilient etc, etc. This all feels like something that must been done many times before. Are there standards for documenting this?

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• Netgear router keeps disconnecting iPhone

  - by DisgruntledGoat

  My old router (Voyager 2091) packed up so I just got a new router - a Netgear N150 model DGN1000. My laptop connects OK wirelessly, but my iPhone 4S is constantly getting "disconnected" - it has perfect wifi signal and is seemingly connected to the router, but no pages load (it says "server cannot be found"). If I disconnect manually ("forget this network") then reconnect, it works fine again for a random amount of time (usually 10-30 minutes) then I get the same problem again. I've done some searching and this appears to be a known problem - there are dozens of forum posts out there lamenting similar connection problems. The only advice I have seen is to set a specific channel under Wireless Settings on the router CP, although every forum post recommends a different channel! 1, 3, 5, 6, 11... I have tried them all for hours at a time and get the exact same problem. The firmware is up to date. Is there an actual solution for this, or do I need to get a different router just to be able to use my iPhone?

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• Why would e-mail from our own domain not be forwarded to gmail

  - by netboffin

  To solve a problem with spam on our server we tried to forward e-mail from our dedicated server's mailserver(matrix smtp service) to gmail, but while most e-mails got through e-mail from our own domain all went missing. They weren't in the inbox or spam or anywhere else. We've had to go back to using the old system, which means my boss gets a huge amount of spam. We have a windows 2003 server with iis 6 and the matrix smtp service installed. I've toyed with the idea of installing a mail proxy like ASSP but it looks pretty complicated. We're hosting 20 domains on the server as well as our own which has an online shop whose payment system depends on email. I can't start playing around with complicated solutions when it could have disastrous consequences and I don't know enough to implement them safely. So my question has two parts: Part One: Why can't we forward e-mails from people using the same domain. If our domain was foobar.com then [email protected] can't receive from [email protected], but he can receive from everyone else. Part Two: Is there a really simple server side solution to spam that would work with matrix? For instance popfile?

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• Join multiple filesystems (on multiple computers) into one big volume

  - by jm666

  Scenario: Have 10 computers, each have 12x2TB HDDs (currently) in raidZ2 (10+2) configuration, so, in the each computer i have one approx. 20TB volume. Now, need those 10 separate computers (separate raid groups) join into one big volume. What is the recommended solution? I'm thinking about the FCoE (10GB ethernet). So, buying into each computer FCoE (10GB ethernet card) and - what need more on the hardware side? (probably another computer, FCoE switch? like Cisco Nexus?) The main question is: what need to install and configure on each computer? Currently they have freebsd/raidz2, but it is possible change it into Linux/Solaris if needed. Any helpful resource what talking about how to build a big volumes from smaller raid-groups (on the software side) is very welcomed. So, what OS, what filesystem, what software - etc. In short: want get one approx. 200TB storage (in one filesystem) from already existing computers/storage. Don't need fast writes, but need good performance on reading data. (as a big fileserver), what will works transparently, so when storing data don't want care about onto what computer the data goes. (e.g. not 10 mountpoints - but one big logical filesystem). Thanks.

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• Finding matching columns in excel

  - by fakaff

  I've never used excel before so I need the simplest solution available, and this is a work assignment due this week so I didn't have time read much of the documentation. Basically, I have two tables, A and B, and they are both thousands of rows long. Description of my task: right now (since I don't know better) I'm manually doing this: Go to row i in table B. Select entries in columns B(a, b, c) of that same row. Look for a row in table A where column A(b) matches row B(a). Paste the entries of columns B(a) of row i at the end of the row found in the last step. Repeat for row i + 1. Example: row B(cat, dog, mouse) matches A(mammal, cat, Mr. Whiskers). So I would paste B after A and have A(mammal, cat, Mr. Whiskers, cat, dog, mouse). Note: I am not joining tables. I am merely extending table A by pasting row A(b) if row A(b) matches row B(a). Also, sometimes entries are spelled slightly differently. Using wildcards to search for candidates would be of help. As the description should let on, this task is very tedious and inefficient if I don't know how to automate some operations (there are thousands of entries). Any quick tips as to how to be more productive is a big help.

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• Varnish gets in a restart loop and causes the system to lock up; how can I fix?

  - by chrism2671

  Here is an extract from the syslog. Mar 2 14:01:10 ip-10-226-34-17 varnishd[20204]: Child (20205) not responding to ping, killing it. Mar 2 14:01:16 ip-10-226-34-17 varnishd[20204]: Child (20205) not responding to ping, killing it. Mar 2 14:01:16 ip-10-226-34-17 varnishd[20204]: Child (20205) died signal=3 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child cleanup complete Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: child (13224) Started Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Closed fds: 4 5 6 10 11 13 14 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Child starts Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said managed to mmap 536870912 bytes of 536870912 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Ready Mar 2 14:01:35 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:02:10 ip-10-226-34-17 last message repeated 7 times Mar 2 14:03:15 ip-10-226-34-17 last message repeated 13 times Mar 2 14:03:20 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) died signal=3 Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child cleanup complete Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: child (13288) Started I'm not expecting a solution here but any help just to decode what each line is doing would be very instructive. Many thanks!

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• Scaling databases with cheap SSD hard drives

  - by Dennis Kashkin

  Hey guys! I hope that many of you are working with high traffic database-driven websites, and chances are that your main scalability issues are in the database. I noticed a couple of things lately: Most large databases require a team of DBAs in order to scale. They constantly struggle with limitations of hard drives and end up with very expensive solutions (SANs or large RAIDs, frequent maintenance windows for defragging and repartitioning, etc.) The actual annual cost of maintaining such databases is in $100K-$1M range which is too steep for me :) Finally, we got several companies like Intel, Samsung, FusionIO, etc. that just started selling extremely fast yet affordable SSD hard drives based on SLC Flash technology. These drives are 100 times faster in random read/writes than the best spinning hard drives on the market (up to 50,000 random writes per second). Their seek time is pretty much zero, so the cost of random I/O is the same as sequential I/O, which is awesome for databases. These SSD drives cost around $10-$20 per gigabyte, and they are relatively small (64GB). So, there seems to be an opportunity to avoid the HUGE costs of scaling databases the traditional way by simply building a big enough RAID 5 array of SSD drives (which would cost only a few thousand dollars). Then we don't care if the database file is fragmented, and we can afford 100 times more disk writes per second without having to spread the database across 100 spindles. . Is anybody else interested in this? I've been testing a few SSD drives and can share my results. If anybody on this site has already solved their I/O bottleneck with SSDs, I would love to hear your war stories! PS. I know that there are plenty of expensive solutions out there that help with scalability, for example the time proven RAM-based SANs. I want to be clear that even $50K is too expensive for my project. I have to find a solution that costs no more than $10K and does not take much time to implement.

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