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• Is 1GB + 1GB RAM better than 2GB +0.5GB?

  - by pibboater

  My laptop has two slots for RAM, and currently has two 512 MB chips, for 1 GB. Windows XP is running terribly slow on it, so I want to upgrade the RAM. I could buy two 1 GB chips to replace both of the current 512 MB chips, to give me 2 GB of RAM. Or, the price is the same to buy one 2 GB chip, to replace just one of the 512 MB chips, and give me 2.5 GB total. The RAM it takes is PC2-4200 533MHz DDR2. What do you think would be better: buying two 1 GB chips so it can take advantage of dual-channel operation, or buying one 2 GB chip to end up with more total RAM but not dual-channel operation? Like I said, price is the same, so performance is the only consideration. I'm not doing anything especially intensive like video or photo editing -- just having multiple Office programs open, playing music, browsers, etc., but currently even opening the first application takes forever. If it matters, the laptop is a Toshiba Qosmio G25-AV513 running Windows XP Media Center SP3. Thanks! Kevin

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• IDE compatability with SATA image

  - by Ormis

  We had an old CNC machine's hard-drive fail recently. The hard-drive is an old 1275MB IDE (Seagate) and there were defiantly bad sectors on it. I was able to image the contents of the drive onto a drive in my computer before it became completely unusable (I used DD, replacing all bad sectors w/ 0s). After running a couple chdsks, the SATA drive will boot off of the image. This is great, but there's one problem. The CNC machine old and requires IDE, I've attempted to copy the currently booting image off of the SATA drive and onto IDE drives numerous times in numerous ways and every time I do so the machines return that a boot device cannot be found. Some other information: The file system is fat32, running windows 98 The SATA drive is an 80gb drive I have tried copying the image to three 20gb and two 80gb IDE drives I have checked the jumper on the back of the IDE drives when using them If anyone has any ideas, questions, suggestions, etc. please let me know. P.S. I would just put a fresh install of win98 on the machine if i had the installation media (so that's out of the question). And if it comes to it, this is my last week working here, so I'll leave that to my co-worker. EDIT: Also, I have tried using Clonezilla as well as straight up DD to copy the image to the IDE drives.

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• PCI Tv Tuner not receiving signal

  - by C-dizzle

  I inherited an Angel II PCI Dual TV Tuner card, popped it into my computer's PCI slot, plugged in my coax cable, but am having trouble getting any type of signal to it. The computer I am using is Windows 7 Ultimate 32 bit, I know the card works because the computer recognizes it and installs the drivers, or at least I assume it works because of that. I'm trying to use Windows Media Center to watch/record tv. Here are a few things I have tried to get it working: Uninstalled/Reinstalled the newest drivers Tried hooking up an antenna to the coax input instead of my cable Instead of using cable splitter, went directly from wall output into card with coax cable Tried using different output on splitter in case the out port was bad I haven't tried a different coax cable yet, it should be fine since it's pretty new. Since this is my first time setting up a TV Tuner card, is there anything specific that I need to do with it? Is there any configuration that needs to be done on it? Do I need to have a digial receiver? I was getting pretty frustrated with it so I wanted to turn here to the experts, I'm sure someone can help me figure it out.

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• How can I stop Excel from eating my delicious CSV files and excreting useless data?

  - by atroon

  I have a database which tracks sales of widgets by serial number. Users enter purchaser data and quantity, and scan each widget into a custom client program. They then finalize the order. This all works flawlessly. Some customers want an Excel-compatible spreadsheet of the widgets they have purchased. We generate this with a PHP script which queries the database and outputs the result as a CSV with the store name and associated data. This works perfectly well too. When opened in a text editor such as Notepad or vi, the file looks like this: "Account Number","Store Name","S1","S2","S3","Widget Type","Date" "4173","SpeedyCorp","268435459705526269","","268435459705526269","848 Model Widget","2011-01-17" As you can see, the serial numbers are present (in this case twice, not all secondary serials are the same) and are long strings of numbers. When this file is opened in Excel, the result becomes: Account Number Store Name S1 S2 S3 Widget Type Date 4173 SpeedyCorp 2.68435E+17 2.68435E+17 848 Model Widget 2011-01-17 As you may have observed, the serial numbers are enclosed by double quotes. Excel does not seem to respect text qualifiers in .csv files. When importing these files into Access, we have zero difficulty. When opening them as text, no trouble at all. But Excel, without fail, converts these files into useless garbage. Trying to instruct end users in the art of opening a CSV file with a non-default application is becoming, shall we say, tiresome. Is there hope? Is there a setting I've been unable to find? This seems to be the case with Excel 2003, 2007, and 2010.

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• Software/hardware to build video streaming server?

  - by Sasha Yanovets

  I am looking for a video streaming server solution, something like online TV server, with ability to make live broadcasts in the internet. What software could you recommend for that? What kind of hardware it should run on, should be there anything special? I am looking for a solution that could be scaled up to at least 1000 simultaneous users online with good resolution of video. I think it is good to have general answer on what direction to choose. But here more details on my specific case: I just looking for a solution almost from scratch. We have some video content that we've produced, but it is not delivered over internet yet. We do not tied to any particular vendor for now. We want to make 24 hours of steaming three 8 hour blocks with change of content every day. We want the ability to make regular live broadcasts. I guess we will need to have several options of streaming quality (low ~56 kb/s mid ~273 kb/s). Some terms just foreign to me (like play-truncation rate), if you could point out what parameters we should avare of, it would be great. Uplink to the internet is to be determined. We plan to start from something and scale up on the way. If you are already have some kind of media streaming server, just describe its configuration here (hardware, OS, software), peak number of concurrent users it serves. I think it could help people approaching this task.

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• Basic IPTables setup for OpenVPN/HTTP/HTTPS server

  - by Afronautica

  I'm trying to get a basic IPTables setup on my server which will allow HTTP/SSH access, as well as enable the use of the server as an OpenVPN tunnel. The following is my current rule setup - the problem is OpenVPN queries (port 1194) seemed to be getting dropped as a result of this ruleset. Pinging a website while logged into the VPN results in teh response: Request timeout for icmp_seq 1 92 bytes from 10.8.0.1: Destination Port Unreachable When I clear the IPTable rules pinging from the VPN works fine. Any ideas? iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE iptables -A INPUT -p tcp --dport 1194 -j ACCEPT iptables -A FORWARD -p tcp --dport 1194 -j ACCEPT iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -i ! lo -d 127.0.0.0/8 -j REJECT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT iptables -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT iptables -A INPUT -j REJECT iptables -A FORWARD -j REJECT

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• AutoHotKey temporarily rebind Winkey

  - by wes

  I've got a wireless keyboard that puts some media keys on top of the Function keys, so that by default F4 is actually lock (Rwin & l) and Fn+F4 is a real F4. So I'd like to basically switch those around. Here's what the key history shows: VK SC Type Up/Dn Elapsed Key ------------------------------------- 73 03E d 17.32 F4 ; Fn+F4 73 03E u 0.16 F4 5C 15C d 2.96 Right Windows ; F4 4C 026 d 0.00 L 5C 15C u 0.13 Right Windows 4C 026 u 0.00 L This doesn't do anything: SC15C & SC026::MsgBox,Pressed F4 But this prints that I hit F4 then goes to the login screen: Rwin & l::MsgBox,Pressed F4 So how can I stop it from switching to the login screen? Ideally I'd like F4 (which registers as Rwin & l) to just send F4, Fn+F4 to send Rwin & l, and also have them work with other keys (e.g., a manual !F4 should still close a window). Is this possible?

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• 403 Forbidden serving static files from VirtualBox shared folder with nginx (Ubuntu 10.04LTS guest, Windows 7 host)

  - by Chris Pratt

  I'm working on a local development VM and trying to test serving my site with gunicorn and nginx as a reverse proxy for static resources only. The site loads minus static resources with user nginx; in nginx.conf. Attempting to load a static resource individually reveals a 403 Forbidden error. For background. The static resources are in a shared folder under /media/sf_work. All files are owned by root:vboxsf (VirtualBox default). My user account on the system has been added to the vboxsf group, and I have full access to the shared folder. For comparison, I tried changing the nginx.conf user to my user account. In that scenario, the static files did load, but then the homepage itself gives a 403 Forbidden error. So, I then tried adding the nginx user to the vboxsf group, but then everything gives a 403 Forbidden error. After further investigation it seems that if the nginx.conf user is in any group, it results in a 403 Forbidden. Any idea what could possibly be going on here?

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• W7-pro indexing mydoc on disk partition does not work

  - by Yvan Thery

  I am working on a HP-7100 mini tower running W7 Pro 64bits. My Local HD includes C:/ + 2 disk partitions : all my documents are located on disk partition L:/ and all my media files are on disk partition M:/ The indexing process works well on C:/ and M:/ but does not index the L:/ any more also all of them are allowed to be indexed, also the system is present on all drive security tabs. I have tested to rebuilt the indexing file with a new setting including few directories present on drive C/M/L but still with L: does not work ! One more thing I can tell you is that even after rebuilding the indexing file, I can find some residual directories or files which are out of the test selection. It is like unerased components remaining in the indexing database. As I do not know precisely how the indexing process works it is hard to know what to do ... Recently I had a bad time after using a past restoration procedure ... maybe it did corrupt the indexing file ???? If I start indexing the all L:/ disk partition the system stop at 39 found index also many more are existing .... Does any one from you guys could advise the process to create a new indexing database ... ? Any idea to get out of this mess ? Many thanks for assistance Yvan

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• MySQL stops accepting connections over 3306, still working on localhost

  - by Ben Dilts

  I have a MySQL database that stopped accepting connections from my web server altogether. So I SSH'ed into the server and started checking its vitals. The hard disks had plenty of open space, and there was plenty of available memory and swap space. Nothing was eating up the CPU (close to 100% idle). I even connected to MySQL locally and ran a few queries without any issues. But SHOW PROCESSLIST only showed my own connection, no others. Worst of all, in the MySQL log, no errors even remotely coincided with the unavailability of the server. On the web server, I got an error saying "Lost connection to MySQL server during query" at the moment the unavailability started, followed by a bunch of "MySQL server has gone away" errors. There's only one other application on the server that accepts network connections, and I killed that one (in case it was holding too many open connections or something), but it didn't help. Finally I just restarted the MySQL process, and everything is (for now) working again. What else should I check in these circumstances? Any idea what the problem might be? And how might I verify that is in fact the problem?

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• Home Network Stopped Working

  - by James

  I have a home network where a machine running Windows 7 Ultimate N acts as a central hub for other devices to access media. This has been running for around 2 years now and there has been no recent configuration changes. The machine has a static IP address (192.168.0.3), which also has not been changed. A few laptops, Sonos music system and mobiles are using the machine for music/video mostly. Additionally, post 3389 was also open for RDP. I used a no-ip agent to map a hostname so I could RDP to the machine from the internet. As of yesterday when I try to ping the machine, I get PING:Transmit Failed, General Error I noticed however, the IP it is pinging is 0.0.2.233. All shares etc are no longer functioning including RDP. On the machine itself, an IP config shows like nothing has changed. It still shows the expected IP. If I ping itself from its hostname, I get the same error as above. machine has been rebooted, the router has been also. Any ideas where to even start on this?

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• What LPR arguments do I need to print a 1400x800 pixel image on a 4x6 label?

  - by Nick

  This is driving me nuts. UPS sends our system a 1400x800 GIF image of a shipping label, which is supposed to fit nicely on a 4x6 page. Unfortunately, I can't seem to get the command line options right to make it happen. We're using an Eltron/Zebra 2844 with a network adapter, and printing from our Ubuntu 8.04 server using CUPS. We're using the correct drivers, and test pages print correctly. No matter what I try though, it insists on printing the UPS labels accross 6 pages, with a little bit of the label on each page, or way too small. I've tried a bazillion different lpr settings, most of them producing garbage. The closest I've gotten is this: lpr -P Eltron2844 -o natural-scaling=55 -o page-right=0 -o page-left=0 -o landscape -o media="4x6" ./1ZY437560399620027.gif but it causes the image to be too small on the page. It's about an inch too short, and there's a 1/2" margin on both sides. If I bump the scale up to 56, it explodes the image onto two pages, and squashes it. Any ideas?

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• Joomla performance problems on AWS

  - by Bobby Jack

  I'm running a site on AWS with the following setup: Single m1.small instance (web server) Single RDS m1.small db Joomla 1.5 Generally, the site is performant, but is fairly low-traffic - say around 50-100 visits / hour. However, at peak time, we see about double that traffic. During peak time, pretty much every day: CPU usage on the web server slowly climbs to 100% CPU usage on the RDS server climbs quite quickly to about 30%, from an average of about 15 Database connections shoot up to about 140, from a normal average of about 2 or 3 The site is then occasionally unreachable, certainly according to pingdom monitoring. Does anyone recognise this behaviour? Can you point me in the right direction to begin investigating? Of course, RDS makes it difficult to do things like slow query logging, so I've started by regularly dumping the mysql process list into a file to see if there's anything I can spot there, but it would be good to have something more concrete to investigate. UPDATE At least, can someone confirm that I'm definitely right in saying that the level of traffic implies the problem must be a specific type of query taking way longer than it should to execute? This would happen if a table gets locked, and many queries need to write to it, right? For this very reason, I've already changed the __session table type to InnoDB.

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• How may I retrieve data from an Excel table based on a variable number of criteria?

  - by Eshwar

  I have the following salary data for example: Country State 2012 2013 -> 2027 ======= ===== ==== ==== China Other 1000 1100 China Shanghai 1310 1400 China Tianjin 1450 1500 India Orissa 1500 1600 So now in another Excel sheet I would want an answer to one of the following questions: What is the salary in Shanghai for 2013? (Answer would be 1400) What is the salary in Hubei province for 2012? (Since it is not listed, use "Other" - 1000) What is the average salary in China for 2013? (Answer would be 1450) What is the highest salary in China for 2012? (Answer is Tianjin) So as in the above order of priority, I would like those numbers in another Excel sheet using some form of query. I considered PivotTables but I was wondering if there is another much better more efficient way of doing this? I imagine SQL is suited for this but I am not clued up on that. Some Excel functionality is much rather preferred. Also suggestions on an appropriate format of data for such queries would be appreciated.

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• htaccess hacked - i've deleted code and file - what next?

  - by user1762595

  My website was hacked recently. I think i've found the code that was added to the htaccess file, deleted it and then added script to prevent the htaccess file being accessed again. I've also deleted the php file that the hacked code refers to (common.php). What do i need to do next? I'm not a programmer or website developer but i really wanted to see if i could fix the problem myself as i've spent quite a few hours trying and don't give up easily. Here is the hacked code that i deleted; <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{HTTP_USER_AGENT} (google|yahoo) [OR] RewriteCond %{HTTP_REFERER} (google|yahoo) RewriteCond %{REQUEST_URI} /$ [OR] RewriteCond %{REQUEST_FILENAME} (shtml|html|htm|php|xml|phtml|asp|aspx)$ [NC] RewriteCond %{REQUEST_FILENAME} !common.php RewriteCond /home/httpd/vhosts/bluestardive.com/httpdocs/common.php -f RewriteRule ^.*$ /common.php [L] </IfModule> this code has to stay in the htaccess file as it redirects my url to seo friendly ones or the website errors, but has this code been hacked as well? # Apache search queries statistic module RewriteEngine On AddHandler php5-fastcgi .php .php5 # <contrexx> # <core_modules__alias> RewriteRule ^about-us$ /index.php?page=883 [L,NC] RewriteRule ^ausfluge-und-aktivitaten$ /index.php?page=800 [L,NC] RewriteRule ^bluestardive-news$ /index.php?page=919 [L,NC] RewriteRule ^bookings$ /index.php?page=911 [L,NC] RewriteRule ^diveresort$ /index.php?page=879 [L,NC] RewriteRule ^diving$ /index.php?page=880 [L,NC] RewriteRule ^excursions-and-activities$ /index.php?page=881 [L,NC] RewriteRule ^galerie$ /index.php?section=gallery [L,NC] RewriteRule ^oceannight$ http://www.bluestardive.com/index.php?page=906 [L,NC] RewriteRule ^philosophy$ /index.php?page=846 [L,NC] RewriteRule ^reservation$ /index.php?page=917 [L,NC] RewriteRule ^reservierung$ /index.php?page=918 [L,NC] RewriteRule ^resort$ /index.php?page=798 [L,NC] # </core_modules__alias> # </contrexx> many thanks for any help Claire

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• Trouble Letting Users Get to Certain Sites through Squid Proxy

  - by armani

  We have Squid running on a RHEL server. We want to block users from getting to Facebook, other than a couple specific sites, like our organization's page. Unfortunately, I can't get those specific pages unblocked without allowing ALL of Facebook through. [squid.conf] # Local users: acl local_c src 192.168.0.0/16 # HTTP & HTTPS: acl Safe_ports port 80 443 # File containing blocked sites, including Facebook: acl blocked dst_dom_regex "/etc/squid/blocked_content" # Whitelist: acl whitelist url_regex "/etc/squid/whitelist" # I do know that order matters: http_access allow local_c whitelist http_access allow local_c !blocked http_access deny all [blocked_content] .porn_site.com .porn_site_2.com [...] facebook.com [whitelist] facebook.com/pages/Our-Organization/2828242522 facebook.com/OurOrganization facebook.com/media/set/ facebook.com/photo.php www.facebook.com/OurOrganization My biggest weakness is regular expressions, so I'm not 100% sure about if this is all correct. If I remove the "!blocked" part of the http_access rule, all of Facebook works. If I remove "facebook.com" from the blocked_content file, all of Facebook works. Right now, visiting facebook.com/OurOrganization gives a "The website declined to show this webpage / HTTP 403" error in Internet Explorer, and "Error 111 (net::ERR_TUNNEL_CONNECTION_FAILED): Unknown error" in Chrome. WhereGoes.com tells me the URL redirects for that URL goes like this: facebook.com/OurOrganization -- [301 Redirect] -- http://www.facebook.com/OurOrganization -- [302 Redirect] -- https://www.facebook.com/OurOrganization I tried turning up the debug traffic out of squid using "debug_options ALL,6" but I can't narrow anything down in /var/log/access.log and /var/log/cache.log. I know to issue "squid -k reconfigure" whenever I make changes to any files.

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• Chrome will not load a web page with an <embed> element

  - by rossmcm

  I have been trying to get a simple sound web page going: Sound.html <script> function PlaySound () { var sounder = document.getElementById ("ToneA") ; sounder.Play () ; } </script> <embed id="ToneA" height="1" width="1" src="https://dl.dropboxusercontent.com/u/311035/ToneA.mp3" autostart="false" enablejavascript="true"//> <button onclick="PlaySound () ;">Play</button> The test web page is here. It plays in IE, but not in Firefox or Chrome. My problem: Chrome reports "Could not load VLC Plugin". It seems to be a known problem that the VLC community don't necessarily feel like fixing at the moment, and is a result of Google choosing not to allow some certain kind of plugin. If I disable the plugin I no longer get the message but nothing happens when I click the button. Looking at the console in a debug window I see Uncaught TypeError: undefined is not a function Sound.html:7 PlaySound Sound.html:7 onclick which suggests Chrome could not find anything else to handle the sound file. How to I tell Chrome to use (e.g.) Windows Media Player? * UPDATE * This is apparently because the VLC plugin is a NPAPI plugin and Chrome no longer supports these. I have uninstalled VLC and this has removed the error on loading the webpage with an embedded sound element, but it still doesn't invoke WMP instead.

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• How is the extra mSATA SSD disk used/configured in a Dell XPS laptop?

  - by Mark

  Some machines in the new XPS laptop range from Dell come with a regular, large (500GB+) HDD and an additional 32GB m-SATA SSD. The only detail I can find about this extra drive on the Dell site is this: Store your important files, multimedia and photos with XPS 15’s large hard drive options. To get instant access to your media, choose an optional mSATA solid-state drive (SSD) that can boot up to twice as fast as a regular hard drive and resumes in less than 1 second. I'd like to know more about how this extra drive is set up and used, specifically: Is anything installed on it (e.g. OS files or a boot loader) or is it just used as swap space? Is the m-SATA drive visible as a lettered drive in Windows? (I'd guess not if it's used for swap file only.) Is this unusual configuration likely to cause any problems later down the line - e.g. when upgrading to Windows 8? As usual, Dell's sales team haven't been able to help. If anyone's actually got a Dell machine with this or a similar hard drive set-up and can give a definitive answer rather than speculation I'll accept the answer.

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• disk space keeps filling up on EC2 instance with no apperent files/directories

  - by sasher

  How come os shows 6.5G used but I see only 3.6G in files/directories? Running as root on an Amazon Linux AMI (seems like Centos), lots of free memory available, no swapping going on, no apparent file descriptors issue. The only thing I can think of is a log file that was deleted while applications append to it. Disk space usage is slowly but continuously rising towards full capacity (~1k/min with very small decreases from time to time) Any explanation? Solution? du --max-depth=1 -h / 1.2G /usr 4.0K /cgroup 22M /lib64 11M /sbin 19M /etc 52K /dev 2.1G /var 4.0K /media 0 /sys 4.0K /selinux du: cannot access /proc/14024/task/14024/fd/4': No such file or directory du: cannot access<br/> /proc/14024/task/14024/fdinfo/4': No such file or directory du: cannot access /proc/14024/fd/4': No such file or directory du: cannot<br/> access/proc/14024/fdinfo/4': No such file or directory 0 /proc 18M /home 4.0K /logs 8.1M /bin 16K /lost+found 12M /tmp 4.0K /srv 35M /boot 79M /lib 56K /root 67M /opt 4.0K /local 4.0K /mnt 3.6G / df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.9G 6.5G 1.4G 84% / tmpfs 3.7G 0 3.7G 0% /dev/shm sysctl fs.file-nr fs.file-nr = 864 0 761182

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• How do I activate the F_LINE input in a transplanted HP chassis?

  - by admin

  I have an HP Pavilion Media Center PC chassis, vintage 2003 or so and I replaced the motherboard in it with a newer (vintage 2009) HP motherboard, M2N68-LA (Narra 5). I have scoured the internet trying to find pinouts for the motherboard to no avail. My question concerns the front panel audio, specifically Line In. The old chassis was built for AC97 but the new mobo is build for the newer HD audio standard. I figured out by comparison & experimentally how to connect the Mic & Headphone jacks to the HD audio header of the mobo by adding a manual switch to set the SENSE lines. Now all works fine for Mic & headphone. The old chassis also has a front panel Line In jack that the newer HP chassis does not have. However, the new mobo has a 4 pin white connector labeled F_LINE that I believe is a line input. Under Windows 7 I see the two Line Inputs in the mixer but I can't get one of them to become active. The 4 pin F_LINE connector uses the two middle pins for ground, and presumably the other two for left and right audio inputs. There are no pins for sensing on that connector. Can anyone tell me how to use that F_LINE input for the front panel, or how to activate it?

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• SBS 2008 - DNS Forwarders timing out.

  - by Moif Murphy

  Hello, We have an SBS 2008 server that keeps losing connection to the internet approx 2-3 times a day. It's a simple setup, BT Business Broadband ADSL to a Wireless Zyxel router to the server. Clients connect via WiFi from their laptops. Plugging ethernet in makes no difference, only a reboot of the router seems to bring everything back again. I'm looking at the forwarders on the DNS properties page and they're timing out when trying to resolve the IPs. Currently there are two IPs in there, 194.72.9.34 which has timed out and 194.72.9.38 which has finally resolved to ns8.bt.net We've been in there and replaced all media, installed a PCI NIC, have changed the router three times. There are no errors in the DNS event logs pertaining to what's going on. We've also been on to BT who are adamant that it's not their end. Could someone shed some light on what could be going on or where else to look in the configuration of the server? Thank you.

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• Can a non-redundant RAID5 cause any serious problems (compared to RAID0)?

  - by leemes

  I used to have a three-disc RAID5 (mdadm) in my computer for personal media storage (music, videos, photos, programs, games, ...). It had three discs with 750 GB each, resulting in an array capacity of 1.5 TB. One day (one year ago), I needed one of those discs to install another operating system. I thought, I don't need the redundancy anymore since I backup the most important stuff (personal photos e.g.) on an external disc anyway. So I decided to remove one of the three discs without converting the RAID to RAID0 or even two separate discs, because I had no temporary storage (since one cannot simply convert the RAID5 to RAID0 AFAIK). So now, for about one year, I have a non-redundant RAID5 with 2 of 3 discs running. Sometimes, one of the discs has a defective contact at the power cable or something similar causing the drive to stop working temporarily (I don't know exactly what it is). Since it still works when rebooting the computer and in most cases by calling some mdadm commands, it wasn't that problematic. Note that the data is not very critical, since I still have a backup of the most important stuff. But in the last few weeks, one of the drives fails very frequently (every few hours), so it gets really annoying to manage this. My questions are: Is there any disadvantage (apart from the annoying management) of a non-redundant RAID5 (with one drive less than typical) over a RAID0? If I understand it correctly, both have no redundancy and the same capacity. On a temporary drive failure, I can restart the array in both cases, assuming that the drive itself still works after the failure. Can it happen that the drive contents alter on a drive failure, making the array inconsistent? If so, can I tell mdadm to check the array for failures (without a file system level checking tool)? Since the drive most probably only has a defective contact causing it to fail for a second only, can I tell mdadm to automatically restart the array, so I will not even notice the failure if no application wanted to access the file system during the failure?

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• Xen or KVM? Please help me decide and implement the one which is better

  - by JohnAdams

  I have been doing research for implementing virtualization for a server running 3 guests - two linux based and one windows. After trying my hands on Xenserver, I am impressed with the architecture and wanted to use the opensource XEN, which is when I am hearing a lot more about KVM, about how good it is and it's the future etc. So, could anyone here please help me answer some of my queries, between KVM and XEN. Based on my requirement of three VMs on one server, which is better for performance - KVM or XEN, considering one the linux vm's will works a file-server, one as a mailserver and the third one a Windows server? Is KVM stable? What about upgrades.. What about XEN, I cannot find support for it Ubuntu? Are there any published benchmarks on both Xen and KVM? I cannot seem to find any. If I go with Xen, will it possible to move to KVM later or vice versa? In summary, I am looking for real answers on which one I should use.. Xen or KVM?

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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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• Computer will not boot - disk read error - cannot boot from HD or DVD

  - by Grant Palin

  This is a 3 year-old system: HP a1640n. There have been no issues with it in the past. I added a video card 2 years ago, and more memory 1 year ago, both without issues. There haven't been any recent hardware changes. I did install Win7 in Oct., but there were no issues with that either. I used the computer fine two nights ago, and turned it off. Yesterday, I tried to turn it on, and got the error: "A Disk Read Error Occurred. Press CTRL ALT DEL to restart" So I restart, see the initial start screen (HP) and enter the BIOS. The hard drive and dvd drive appear to be listed, but the names are gibberish text. I tried putting a Windows disk in the dvd drive, and continued with the boot, but the disk did not get recognized. Even though the BIOS was set to check for optical media before the hard drive. Back to the error screen. If the computer would boot from a cd or dvd, I would just figure the hard drive needed replacing. But both being problematic worries me. Is this a matter of replacing both the hard drive and dvd drive, or might it be an indication of a bigger problem? Thanks for any advice.

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