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• Log Shipping breaking daily on SQL Server 2005

  - by IT2

  I am facing a somewhat serious problem with Log Shipping on SQL Server 2005 and I am having trouble to correct it, so I will try some help from SF's experts. I have a Windows 2003 Server (PROD) that ships transactional log backups to another two servers: STAND1: Windows 2003 Server with SQL Server 2005. STAND2: Windows 2008 R2 Server with SQL Server 2005. The problem is that Log Shipping to STAND2 is breaking for ~ 90 minutes some times of the day and returning back without intervention. The breaking occur at times when the backup file is larger (after reindexing, etc). I can see the message below logged on the COPY job: *** Error: The specified network name is no longer available The copy agent was breaking dozens times a day only to STAND2 server, and after the changes below "only" breaks ~ two times a day: The frequency of the backup job was changed from 5 minutes to 10 minutes. Instead of backing up the 4 databases to the same folder, the log backups are now saved on separated folders for each database. The backup job doesn't run 24hs now, and only for 14 hours a day, when people are working on the database. I configured the SQL Server instances on the three servers to limit the memory, leaving more memory to the OS. Now I don't know what to do. Any help will be much appreciated! Thanks!

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• Local references to old server name remain after Windows 2003 server rename

  - by imagodei

  I have a standalone Win 2003 server with Windows Sharepoint Services (WSS3) running on it. I had to rename the server and I had bunch of problems resulting from this. Note that the server is not in AD environment. Most obvious problems were with Sharepoint, which didn't work. I was somewhat naive to think it will work in the first place, but OK - I've solved this using step 1 & 3 from this site (TNX) Other curious behavior/problems remain. Most disturbing is that Sharepoint isn't able to send email notifications to participants. I noticed there are several references to old server name everywhere I look: in Registry, in Windows Internal Database (MICROSOFT##SSEE). I see instances of old server name in the Sharepoint Central Administration - Operations - Servers in farm. There is reference to a servers: oldname.domain.local oldname.local On one of those servers there is also Windows SharePoint Services Outgoing E-Mail Service (Stopped). Also, when I try to telnet locally to the mail server (Simple Mail Transfer Protocol (SMTP) service), I get a response: 220 oldname.domain.local Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at Tue, 15 Jun 2010 13:56:19 +0200 IMO these strange naming problems are also the reason why email notifications from within Sharepoint don't work. Can anyone tell me how to correct/replace those references to oldservername? Why is the email service insisting on old name? Of course I would like to try it without reinstalling the server. TNX!

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• MySQL partition "full"?

  - by gdea73

  I have a server that runs Debian 6.2, with Apache, PHP5, and MySQL. Well, I hadn't done anything with MySQL at all so far, just Apache and PHP; I must have installed it (mysql-server) at some point along the line, and I decided to login to the database for the first time a couple days ago as I was considering using the database for a future website project. I noticed that the "root" user had a password, and I didn't recall having set one. My usual root password was incorrect. So I attempted to reset the password. sudo service mysql stop (stopped successfully) sudo /usr/bin/mysqld_safe --skip-grant-tables --skip-networking & started successfully, from what I can tell. However, mysql itself returns "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld,sock' (2)", and additionally sudo service mysql start returns "/etc/init.d/mysql: ERROR: The partition with /var/lib/mysql is too full! ... failed!" df -h tells me that / is 26% used, a 20GB partition, and /home, roughly 900GB, has only 5% usage. On a potentially related note, I've been experiencing random hangs since I noticed this problem, my tty2 randomly froze several times while idle, and the entire system is suddenly unstable. gnome-terminal also does not open. (Gnome-terminal apparently works now, disregard that part, but the server is still being somewhat unstable, I randomly lost connection when I was SSHed into it from my laptop, twice now.)

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• Gnome-panel disappearance in Ubuntu 10.10

  - by jurchiks

  Just today, after about a week of somewhat normal running (I'm a total beginner in Linux and the level of amazingly stupid problems I encountered made me go nuts), today my panel disappeared (the one with Applications/System menus, you'd call it taskbar in Windows). Also, Alt+F2 doesn't work and Ctrl+Alt+Backspace has no effect (I'd think it's supposed to do something). I tried the solution posted here: Panel doesn't show at startup at Ubuntu 10.04 No luck, didn't change absolutely anything. I also couldn't find the .gconf and .gconfd folders using search, so couldn't try that option. There were ones that had same names but without the dot though, but there were several so I didn't risk. What could possibly be the reason for this? All I did yesterday was try to install some updates (another extremely dumb problem - doesn't allow to install even the official updates - "insecure sources" or smth like that, tried fixing it with some tutorials on the net but in the end it worked only for half a day and went back to refusal mode :@) and very few tools from the Ubuntu Software Center, but nothing that would change system settings just by installing it.

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• h264 inside FLV container vs. MP4 container?

  - by Gotys

  I am developing a tube site, and currently having issues with h264 format . By looking at youtube, I noticed they are putting their hi-def videos into mp4 container, so logically I did the same. Next, I installed mod_h264_streaming for lighttpd to make streaming and timeline-scrubbing work. Problem is, that large files (500mb+ at somewhat high resolution) take for EVER to even start buffering ( I read the flowplayer or other flash players need to download metadata first) . I moved the xmov atom to the front of the file with MP4Box (i tried qt-quickstart too) , and the problem didn't go away. Next I read online I need to interleave audio tracks, so I did that too. No change in slowness. So I tried putting the same exact h264 movie into an FLV container, and the playback buffering starts almost instantly - no slowness. So what am I missing here? Why would I choose MP4 container with mod_264_streaming module , which seems super-slow over a regular FLV container with lighttpd's built-in mod_flv_streaming ? Obviously many websites pick mp4 container , but I fail to understand why ? And as a side question - I tried using HTML5's VIDEO tag to try the same h264 MP4 movie, and the scrubbing is LIGHTING FAST! I looked into lighttpd's log file, and i noticed taht Flash Players append video.mp4?start=234 each time timeline is scrubbed, wheres HTML5's video tag does no such thing . Is this some sort of limitations of Flash ? Why Can't flash streaming be same fast as HTML5 streaming? Thanks to ALL who can help. I very much appreciate this community.

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• Laptop Randomly Turning On and Off

  - by Ian Mallett

  So, I have a pretty new laptop, and one of its quirks is that, at random times (though typically in the middle of the night), it seems to wake up from sleep mode, churn a bit, and then go back into sleep mode. I write "seems" because its fans are very loud, so it's obvious when it's not asleep, but during the time it is "on", I can't see anything on the screen. I have researched the problem somewhat, and could only find similar issues; nothing identical. In those cases, it appeared that certain devices could be responsible. Nothing is plugged into my computer during this behavior, but I nonetheless disabled every device's permission to wake the computer through the device manager. This included disabling the magic packet wake for the network (despite its only having a wireless connection). Using "powercfg /lastwake" gives an empty wake history. But, I also went through all the tasks and checked if they would wake the computer. None appeared to. The problem persisted, so, after some more research, I found this, and executed it for all power schemes on the computer. The problem persists. System: OS: Windows 7 Professional CPU: Intel 990X GPU: NVIDIA GeForce 580M/12GB RAM Motherboard: Clevo X7200 Model: NP7282-S1 (Sager-built laptop)

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• VLAN setup on my PC

  - by Surjya Narayana Padhi

  Hi Geeks, I am bit new to VLAN. I want my two computers communicate through VLAN. I have following queries. As I am new to it my queries may be somewhat vague in some points. But i would like to hear from experts for my basic queries. I have two PCs Computer A and Computer B in two different IP networks Network A and Network B Both my PC has windows OS installed. How to send a VLAN(#Number) tagged packet from Computer A to Computer B and how to detect and untag the packet at Computer B? (Please provide the steps for windows OS) For this action do I need to check if my ethernet card supports VLAN tagging/untagging? If yes how can I know if my card supports it or not? Is the VLAN applied for Wireless ethernet controllers also? Do I need any switch or router for this action? Experts please given your inputs so that I can have a strong basic. If anyone can give some inputs how i can detect those VLAN in wireshirk, it will be helpful me also. Thanks in advance.

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• How ZFS handles online replacement in a RAID-Z (theoretical)

  - by Kevin

  This is a somewhat theoretical question about ZFS and RAID-Z. I'll use a three disk single-parity array as an example for clarity, but the problem can be extended to any number of disks and any parity. Suppose we have disks A, B, and C in the pool, and that it is clean. Suppose now that we physically add disk D with the intention of replacing disk C, and that disk C is still functioning correctly and is only being replaced out of preventive maintenance. Some admins might just yank C and install D, which is a little more organized as devices need not change IDs - however this does leave the array degraded temporarily and so for this example suppose we install D without offlining or removing C. Solaris docs indicate that we can replace a disk without first offlining it, using a command such as: zpool replace pool C D This should cause a resilvering onto D. Let us say that resilvering proceeds "downwards" along a "cursor." (I don't know the actual terminology used in the internal implementation.) Suppose now that midways through the resilvering, disk A fails. In theory, this should be recoverable, as above the cursor B and D contain sufficient parity and below the cursor B and C contain sufficient parity. However, whether or not this is actually recoverable depnds upon internal design decisions in ZFS which I am not aware of (and which the manual doesn't say in certain terms). If ZFS continues to send writes to C below the cursor, then we are fine. If, however, ZFS internally treats C as though it were gone, resilvering D only from parity between A and B and only writing A and B below the cursor, then we're toast. Some experimenting could answer this question but I was hoping maybe someone on here already knows which way ZFS handles this situation. Thank you in advance for any insight!

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• Unexpected(?) high 'wasted' memory in memcached

  - by Nanne

  Looking at our memcached stats I think I have found an issue I was not aware of before. It seems that we have a strangely high amount of wasted space. I checked with phpmemcacheadmin for a change, and found this image staring at me: Now I was under the impression that the worst-case scenario would be that there is 50% waste, although I am the first to admit not knowing all the details. I have read - amongst others- this page which is indeed somewhat old, but so is our version of memcached. I think I do understand how the system works (e.g.) I believe, but I have a hard time understanding how we could get to 76% wasted space. The eviction rate that phpmemcacheadmin shows is 2 ev/s, so there is some problem here. The primary question is: what can I do to fix this. I could throw more memory at it (there is some extra available I think), maybe I should fiddle with the slab config (is that even possible with this version?), maybe there are other options? Upgrading the memcached version is not a quickly available option. The secondairy question, out of curiosity, is of course if the rate of 75% (and rising) wasted space is expected, and if so, why. System: This is currently not something I can do anything about, I know the memcached version isn't the newest, but these are the cards I've been dealt. Memcached 1.4.5 Apache 2.2.17 PHP 5.3.5

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• Erratic WiFi 2.4 GHz channel spikes, what gives?

  - by Francis W. Usher

  Sorry guys, first a gripe about my neighbor's WiFi access point (it is related): they totally hog the center nine 2.4 GHz channels (3-11), centered right at 7! I know the outer regions of the signal don't make as much of a difference, and technically they're running channels 5 & 9. Anyway, their signal is clearly interfering with mine, which is necessarily centered at 3 or 11 to evade their interference. I guess it's somewhat a case of access point envy: they happen to have both a stronger signal and a higher data rate, while occupying twice the band width that I do. Getting to the point, I've noticed that they tend to sit nice and pretty centered at 7, but they definitely auto-select their channel, and I've noticed that the auto-selection algorithm tends to shift towards the higher channels; hence I decided to pick channel 3, and I don't get so many intermittent lag spikes any more. Anyway, the thing that weirded me out was the reason they have to auto-select sometimes: unexplained, powerful (talking order of 0dB here), giant spikes of 2.4 GHz activity in consistent regions of the spectrum. I don't think it's just noise, since my wireless monitoring software is registering a MAC address, a manufacturer, and usually a fairly coherent ascii name... and it seems to be a fairly well-confined signal. But these signals are fairly common, and they do some weird stuff to my signal. So my question is what are these signals? Where are they coming from? Where are they going? Why are they so ridiculously strong? Why don't they ever last very long? Here's an inSSIDer screenshot I took, for your perusal. I am labeled with "me", my greedy neighbor labeled with "neighbor", and the 2 quasar signals are labeled with "WTF?".

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• What performance degradation to expect with Nginx over raw Gunicorn+Gevent?

  - by bouke

  I'm trying to get a very high performing webserver setup for handling long-polling, websockets etc. I have a VM running (Rackspace) with 1GB RAM / 4 cores. I've setup a very simple gunicorn 'hello world' application with (async) gevent workers. In front of gunicorn, I put Nginx with a simple proxy to Gunicorn. Using ab, Gunicorn spits out 7700 requests/sec, where Nginx only does a 5000 request/sec. Is such a performance degradation expected? Hello world: #!/usr/bin/env python def application(environ, start_response): start_response("200 OK", [("Content-type", "text/plain")]) return [ "Hello World!" ] Gunicorn: gunicorn -w8 -k gevent --keep-alive 60 application:application Nginx (stripped): user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; } http { sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; upstream app_server { server 127.0.0.1:8000 fail_timeout=0; } server { listen 8080 default; keepalive_timeout 5; root /home/app/app/static; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } } } Benchmark: (results: nginx TCP, nginx UNIX, gunicorn) ab -c 32 -n 12000 -k http://localhost:[8000|8080]/ Running gunicorn over a unix socket gives somewhat higher throughput (5500 r/s), but it still does't match raw gunicorn's performance.

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• Anonymous file sharing without login window, from Windows 7 server to XP clients

  - by Niten

  I'm trying to provide machines on a small LAN with read-only, anonymous access to files shared from a Windows 7 workstation (let's call it WIN7SVR). In particular, I don't want clients to have to deal with a login window when they navigate to, e.g., \\WIN7SVR in Windows Explorer, but we do not have a domain and synchronizing accounts between the server and clients would be intractable. There are both Windows 7 and Windows XP clients that need access to these shares. I got this working for Windows 7 clients by just enabling the Guest account on WIN7SVR and setting appropriate share permissions. Other Windows 7 machines automatically try logging in as Guest, it seems, so their users don't have to deal with the login window. The problem is with the XP clients--they can access the server if the user enters "Guest" in the login window, but I don't want users to have to do that. So from what I gather, in my limited understanding of Windows file sharing, this boils down to granting null sessions access to file shares on WIN7SVR. But I've had no success so far on that front. I've tried all the following in the local group policy editor on the Windows 7 server: Set Network access: Let Everyone permissions apply to anonymous users to Enabled Set Network access: Restrict anonymous access to Named Pipes and Shares to Disabled Added the names of corresponding shares to Network access: Shares that can be accessed anonymously Added "ANONYMOUS LOGON" to Access this computer from the network under User Rights Assignment Any advice would be highly appreciated... I'm mostly a Unix guy, so I feel somewhat out of my league with Windows file sharing. I do understand that any sort of anonymous access to file shares isn't generally ideal from a security standpoint, but it's the most practical solution for us in this case, and access to our network is well enough controlled that share-level security isn't a concern.

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• Family server setup [closed]

  - by Manny

  Hi all, I really hope some of you can give me some direction. I have setup a linux server at home and through samba I can access files from different computers in my home. I would like to use this server as a file-server for my family (brothers, sisters and parents who all live in their own homes). I really like the way it is set up right now with user and permission controls, but I've read that it is bad idea to open up the samba port to the world. The requirements are simple: 1) it should be easy to access, by using standard web browsers or mounting the drive (shouldn't have to use any VPN setup or use putty etc) 2) should be somewhat secure. We just want to share family pictures instead of putting them on facebook or picasa or other web server, nothing top secret. Here is what I've looked into: 1)Webdav. It seems decent but seems like it windows7 doesn't like it very much, even with digest mode authentication. User controls and permissions are not as flexible as samba (or at least to my knowledge). I really like the user and group permissions in samba, but if I could live with webdav if it worked seamlessly with windows, it should just work shouldn't it? 2) I read somewhere to stay away from ftp as it is outdated and that there are newer and better internet file-server setups? Was that a reference to webdav? I am so confused, please help... Manny

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• How can I remotely display images on my computer?

  - by Jakob

  What I Have: A laptop booted with Ubuntu and a stationary computer dual-booted with Ubuntu and Vista, both connected through a wireless ad-hoc network. What I Want: I want a way to display images in fullscreen on my stationary, using my laptop as a "remote control". I want to be able to choose another picture at any time and have my stationary computer remain in fullscreen mode at all times. Preferably, I should also be able to display just an empty (black) screen. How can I arrange for this? What I Have Tried: I have tried simply SSH:ing into my stationary computer and opening the image files using an image viewer, but all of the ones that I have tried (Eye of Gnome, Mirage, Gwenview, and others) open a new window for every new image. I don't know how to force them into using a single instance. I have tried using the VLC remote control command line interface, but apart from seeming somewhat unreliable (exiting with segmentation faults at one point), it also displays some images with a green border and forces me to pause playback in order for the image to remain on screen. Bonus Question: In my final setup, I also need to play music through my stationary computer's speaker and have the ability to switch to another track at any point, like with the images. Preferably, I would like to control the images and the audio through the same interface. How can I best achieve this?

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• How to sandbox a VMWare image as much as possible

  - by Craig H

  The situation: -A corporate environment, with a corporate managed XP desktop (locked down, patched regularly, restricted user rights, no manual install of SW, AV, etc.) The requirement: -Using VMWare Workstation, run a sandboxed image (also XP) for specific testing purposes (with admin rights in the guest VM). No network connectivity is required. It can't be a separate standalone physical workstation disconnected from the network. (FWIW, this is a legitimate, sanctioned requirement - not someone trying to get around corporate restrictions.) The challenge: -Do this in as safe/secure a manner as possible. The proposed solution: -Create an image with host-only networking. -Perhaps remove the virtual ethernet adapter? (not sure if it's required for basic VMWare functionality?) The question (finally): -What potential risks remain (and how could I best mitigate them)? One challenge is that the guest VM will not be a managed workstation itself, so patching, AV, etc. can't be guaranteed (and, ironically, would in fact be somewhat difficult given the proposed solution!)

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• Liked Arch Linux - but I am still not sure if its the right distro for me...

  - by BlackAndGold

  As the title says... I used Arch Linux for a while and liked it a lot: leightweight, sleek, fast and well documented with a great community. However I had to format my hd and for the sake of being too lazy to reinstall arch, I used windows 7 exclusively for a while. Now I want to get back to linux again (still dual boot), mainly for web development purposes and using handy tools such as rsync ect. Again, I liked Arch, but there is too much tweeking, too much reading up and too much figuring out what to do as well es some bad suprises especially when you need them the least and when just quickly want to get some work done. I kind of would like to have a little more "out of the box" distro that is still fast and somewhat leighweight and of course reliable. I actually considered Ubuntu, which I am not too big of a fan of, but I will still give the minimal install a shot. However other distros seem interesting as well, such as crunchbang and mint debian ecpecially. My question, hoping this isn't too boring for many you, what is the right distro for me?

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• Intermittent FTP login issues (Microsoft IIS FTP Service)

  - by JaggenSWE

  I've got a somewhat weird problem which I'm not sure how to troubleshoot. We have a FTP running on a Windows Server 2003 machine using the IIS FTP Service, this is for our clients and is configured with IP-restrictions. However, now ONE of the clients starts complaining that they can't log in to the server from time to time. This is just ONE of 10+ clients that have this issue, which makes me think it's a problem on their side. Just to be on the safe side I had a peek into the FTP logs and found something strange. Whenever succeed in loggin in this is what I can find in the logs: nnn.nnn.nnn.70, userxxx, 2012-06-11, 09:22:32, MSFTPSVC1, SERVERNAME, nnn.nn.nn.11, 0, 0, 0, 331, 0, [191747]USER, userxxx, -, nnn.nnn.nnn.70, userxxx, 2012-06-11, 09:22:32, MSFTPSVC1, SERVERNAME, nnn.nn.nn.11, 0, 0, 0, 230, 0, [191747]PASS, -, -, However, if the login fails I see the following events: nnn.nnn.nnn.70, userxxx, 2012-06-11, 09:16:33, MSFTPSVC1, SERVERNAME, nnn.nn.nn.11, 0, 0, 0, 331, 0, [191739]USER, userxxx, -, nnn.nnn.nnn.70, -, 2012-06-11, 09:16:33, MSFTPSVC1, SERVERNAME, nnn.nn.nn.11, 0, 0, 0, 530, 1326, [191739]PASS, -, -, When you look at the event where the clients sends the PASS in the successful login it seems to know that it is infact "userxxx" that is coupled to that PASS, but when it fails it seems to be lost since user in the PASS event is set to "-". Anyone have any ideas around this, any help would be appreciated. :) //JaggenSWE

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• Linux Live CD only works when Windows is in Legacy mode?

  - by Vee

  I have asked a similar question before and no one was able to help me but I think it was because I wasn't phrasing it properly. This is a better restatement of the question. I have Windows 8 and Linux Mint dual booted on my pc. When I tried to boot the Linux from a CD ROM only, it would give me the following error: error: failure reading sector 0x0 from 'hd1' error: you need to load the kernel first. Press any key to continue... The Linux Mint works fine but otherwise, but it gives this error when I try to boot from CD. The boot Linux from CD only worked when I changed the Windows to Legacy mode in the BIOS settings. When I changed it back to UEFI, it would give the same error. Why is this? How can I fix it? I am somewhat new so is there anything else I should know about all of this? NOTE: I changed the Linux into UEFI mode using boot-repair but that still did not solve the problem when I tried to boot from CD ROM.

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• h264 inside FLV container vs. MP4 container?

  - by Gotys

  I am developing a tube site, and currently having issues with h264 format . By looking at youtube, I noticed they are putting their hi-def videos into mp4 container, so logically I did the same. Next, I installed mod_h264_streaming for lighttpd to make streaming and timeline-scrubbing work. Problem is, that large files (500mb+ at somewhat high resolution) take for EVER to even start buffering ( I read the flowplayer or other flash players need to download metadata first) . I moved the xmov atom to the front of the file with MP4Box (i tried qt-quickstart too) , and the problem didn't go away. Next I read online I need to interleave audio tracks, so I did that too. No change in slowness. So I tried putting the same exact h264 movie into an FLV container, and the playback buffering starts almost instantly - no slowness. So what am I missing here? Why would I choose MP4 container with mod_264_streaming module , which seems super-slow over a regular FLV container with lighttpd's built-in mod_flv_streaming ? Obviously many websites pick mp4 container , but I fail to understand why ? And as a side question - I tried using HTML5's VIDEO tag to try the same h264 MP4 movie, and the scrubbing is LIGHTING FAST! I looked into lighttpd's log file, and i noticed taht Flash Players append video.mp4?start=234 each time timeline is scrubbed, wheres HTML5's video tag does no such thing . Is this some sort of limitations of Flash ? Why Can't flash streaming be same fast as HTML5 streaming? Thanks to ALL who can help. I very much appreciate this community.

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• How to create a mysql database that can contain any character, also different languages

  - by Jakke

  I'm trying to create a database that has to contain articles in different languages. I'm using Mariadb as my server and I know bits of SQL. My knowledge doesn't really cover details like the differences between engines like MyISAM, InnoDB etc or character sets like utf8/16/32, latin 5/7/etc. I do know that the character set has importance, I guess what I'm looking for is an all-encompassing character set and an engine that best deals with this type of content. Also, is there an advantage in storing articles in multiple data rows (equivalent of different pages) to make things a little faster, or would you store a whole article in a single data row. Or does that depend on the size of the articles? Sorry for my noobish question, I know the information is all out on the internet but it would take me quite a long time to research and get a grip on everything. Would be cool if someone with experience could give me a little head start and point me in the right direction. This is for a intranet site, consider the content to be somewhat like a blog (and no, I don't want wordpress or something similar at this point). Not sure if it matters, but I tend to create and manipulate my tables with phpmyadmin, I use apache as web server and it all runs on Linux.

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• How do I repartition an SDHC card in Windows?

  - by Peter Mortensen

  How do I repartition an SDHC card (4 GB or more)? Do I need third-part tools or Linux (a live CD solution would be OK)? In Windows' Disk Management the option Delete Partition is dimmed out: I can reformat the card as FAT32, copy files to and from the card and even change the file system to NTFS using the command line command CONVERT, but not repartition it. The article How to Partition an SD Card in Windows XP talks about using "a Windows enabler program" which sound rather dubious to me. I have tried to change from “Optimize for quick removal” to “Optimize for performance”. The option to format as NTFS appeared, but the Delete Partition option is still dimmed out. Platform: Windows XP 64-bit SD card reader: USB 2.0 device, LogiLink® CR0005C Cardreader 3,5' USB 2.0 intern 54-in-1 mit USB Front Kingston 16 GB SDHC card, speed class 4. (It could be formatted as FAT32 and successfully used in a 4 GB ReadyBoost setup (Windows 7).) I have also tried on different versions of Windows and with different cards with the same result: Kingston 4 GB SDHC card, speed class 4 (the one shown in the screenshot) Transcend 2 GB (not marked as SDHC, but SD) Windows 7 32-bit (albeit with a somewhat an older card reader) and Windows XP 32-bit on an EliteBook 8730w

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• How do I prevent a tar pipe from causing swapping?

  - by Jeff Shattock

  I have a rather large filesystem that I need to transfer from one Linux server to another. I figured the best way to do this was via a tar/netcat pipe arrangment, something like tar c . | pv | nc blah blah blah And it works great, the network stays fairly saturated, life is good. Until the source machine starts swapping. The files are on a raid on the source system, so the read speed is much faster than the write speed on the other end. Since the dest machine hasnt picked up the data yet, the source machine needs to stick it somewhere, so into RAM it goes, until there is no more free RAM. It then starts swapping, which is horribly painful since that machine has its OS installed on a somewhat slow CF card. Both machines have 4GB of physical ram, 64 bit Ubuntu 9.04 server. GigE link between them. How do I prevent this swapping? Can I put a "speed-limit" on the tar or netcat process so that the transfer speed doesn't overwhelm the write throughput on the destination end? The man pages didn't list anything, but there might be something I'm overlooking.

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• Puzzling TCP performance over 3G / UMTS

  - by lemonsqueeze

  I'm using 3G as my primary internet connection, and TCP over this thing is getting more puzzling every day. For example: Downloading from kernel.org is crazy fast: $wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.8.tar.bz2 increases to ~500kB/s after a few secs ! Some servers are incredibly slow, for instance www.graphic-pc.com:Same thing, downloading a big file with wget it starts at ~30kB/s for a split second, then collapses to 5-10k or even worse. Web browsing is decent but somewhat unreliable. Randomly, a page will take really long to load or even fail to load, but a reload can succeed almost immediately. Now, by chance i started playing with OpenVPN over UDP on top of the 3G connection, and OMG suddenly everything's extremely fast !Same www.graphic-pc.com now shoots at 100-200kB/s ! What's going on here ??? How come it is so much better with the VPN than without ?? And why does graphic-pc.com crawl when kernel.org flies ?Something to do with my tcp stack (or the server), or some buggy router in between ?? Notes: Setup is laptop running Ubuntu Lucid and a Huawei 3G dongle (So direct pppd connection). I can reproduce this pretty much any time during the day and I'm not moving, so it's clearly not cell environment or internet congestion. (although kernel.org without VPN sometimes does worse in the evening, 60kB or so - but still 500kB with VPN !) For 2) wireshark shows retransmitted packets, dup ack's, even out of order sometimes. I've tried playing with different /proc/sys/net/ipv4 parameters (tcp_rmem, window_scaling, tcp_congestion...) doesn't seem to make a difference. Update: Tried under windows 7 (no VPN) with some interesting results: tcp settings : default tcp_optimizer kernel.org : 10 kB/s 20 kB/s graphic-pc.com: 8 kB/s 70 kB/s ! tcp_optimizer turned on ctcp among other things. Have to check what os graphic-pc.com is running, my bet is linux's tcp_westwood and ms ctcp don't mix well here...

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• Where did my backup files go? Can they be recovered?

  - by Ken

  I just purchased a Western Digital Essential SE 1TB external hard drive from Best Buy at their recommendation. I then exchanged it for a Toshiba Canvio (I think that was the name). I have a Toshiba Qosmio X505-Q898. The Canvio locked up my computer and rewrote some kind of OS file, and erased all the restore points as well as the system image backup (according to Best Buy) just by plugging it in for the first time. Never even got to the install part or anything -- plugged it in and fried my computer. They spent about an hour and a half on my computer and got it back to a somewhat working condition and gave me access to my files. So now they say I have to back it up using my recovery disk and rewriting my OS. Enter the Essential. Brought it home last night, plugged it in and installed everything. Works perfect, no problems. Backed up everything on it. I unplugged and plugged it twice to make sure that everything was on it. Essential told me it had both the HDD and SSD backed up. So I reinstalled my OS. Plugged the Essential in and everything loads right up. Went to retrieve my files and the Western Digital has nothing on it. It shows all my music, pics, ETC. as still being on my computer and needing to be backed up, but since there are no files on my computer now. Where is this information coming from and where did my files go? It's about 810GB worth of files I've amassed over several years. Is there any way to recover data from this? I plan to contact Western Digital and Best Buy, just thought I would check here too. Any advice will be appreciated as a lot of these files are invaluable to me.

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• Family server setup

  - by Manny

  Hi all, I really hope some of you can give me some direction. I have setup a linux server at home and through samba I can access files from different computers in my home. I would like to use this server as a file-server for my family (brothers, sisters and parents who all live in their own homes). I really like the way it is set up right now with user and permission controls, but I've read that it is bad idea to open up the samba port to the world. The requirements are simple: 1) it should be easy to access, by using standard web browsers or mounting the drive (shouldn't have to use any VPN setup or use putty etc) 2) should be somewhat secure. We just want to share family pictures instead of putting them on facebook or picasa or other web server, nothing top secret. Here is what I've looked into: 1)Webdav. It seems decent but seems like it windows7 doesn't like it very much, even with digest mode authentication. User controls and permissions are not as flexible as samba (or at least to my knowledge). I really like the user and group permissions in samba, but if I could live with webdav if it worked seamlessly with windows, it should just work shouldn't it? 2) I read somewhere to stay away from ftp as it is outdated and that there are newer and better internet file-server setups? Was that a reference to webdav? I am so confused, please help... Manny

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