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• Few questions about backing up the OS

  - by user23950

  I'm running windows 7 with 2gb memory and 2.50 Ghz dual core cpu. here are my question regarding backing up an entire drive. I plan to use Macrium Reflect because its free. And I can't afford to buy one. If I backup a hard drive would I only be able to backup the partition where the operating system is? If I have installed applications which requires activation keys, and I have already installed an activation key. Does backing the hard drive also backup those application, so that I won't have to re-apply the keys later? If I have a multi-boot system, would the backup also include those other OS that are installed in my hard drive? Can I still boot into them after restoring the image? Do you have any links there that could enlighten me on what drive backup really is. Thanks!

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• uploading files greater than 1MB = connection resets

  - by Legit

  I'm using nginx on the frontend as "proxy cache" and apache on the backend, i've set my PHP settings to the following: error_log = /var/www/site1/php_error.log error_reporting = 22527 file_uploads = On log_errors = On max_execution_time = 0 max_file_uploads = 20 max_input_time = -1 memory_limit = 512M post_max_size = 0 upload_max_filesize = 1000M What's the problem? Uploading files less than 1MB is successful but anything greater than that, Google Chrome outputs: Error 101 (net::ERR_CONNECTION_RESET): The connection was reset. I already checked for the error log file but it doesn't exist in the directory. I also checked /var/log/httpd/error_log but no uploading related problems. I don't know anything else which might have caused the problem so I have reached out for your helping hand. Thanks!

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• Need data on disk drive management by OS: getting base I/O unit size, “sync” option, Direct Memory A

  - by Richard T

  Hello All, I want to ensure I have done all I can to configure a system's disks for serious database use. The three areas I know of (any others?) to be concerned about are: I/O size: the database engine and disk's native size should either match, or the database's native I/O size should be a multiple of the disk's native I/O size. Disks that are capable of Direct Memory Access (eg. IDE) should be configured for it. When a disk says it has written data persistently, it must be so! No keeping it in cache and lying about it. I have been looking for information on how to ensure these are so for CENTOS and Ubuntu, but can't seem to find anything at all! I want to be able to check these things and change them if needed. Any and all input appreciated.

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• Solr performance (tomcat) - High load

  - by Ward Loockx

  I'm relatively new to solr. I have a production site running on a VPS, but now I'm having serious load issues. I don't know where to start in order to get the load down... VPS specs (linode.com 512) 512 MB RAM 4 CPU (1x priority) Looks like my solr server (tomcat) is using a lot of CPU power You can find my solrconfig.xml on http://pastebin.com/qdfi8Med and my schema.xml on http://pastebin.com/rRusDP8b I've tried to increaese the cache size, but this didn't do anything on the load. You can see the stats page below. EDIT - Because the screenshot was unclear, I took smaller screenshots if what (I think) is important. Dismax query handler stats Caches stats Thanks for the help!

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• How many xml http requests is too much for a pc to handle?

  - by Uri

  I'm running mediawiki on an apache on a regular pc running vista (don't know the specific specs, but I'm guessing at least duo core 2 2 giga hertz processor, broadband connection (500 kb/s at least, probably 1 mega). I want to use the MediaWiki api to send a lot of requests to this server. Most of the time the requests will be sent through LAN (but sometimes through the internet). I'm talking thousands of requests every few seconds at worst case. (A lot of these requests may repeat themselves, I guess some sort of cache would help) Will the server handle this, or do I need a stronger/dedicated computer? (I'm not looking for specific yes/no, but just want to get an idea as to what configuration of computer will support how many request per second) Thanks

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• HP MSA 1000 SAN: Can I use 1 array/shelf?

  - by CC

  Hi all, I'm planning some expansion on an HP MSA1000 SAN. My boss says that we need to have two separate arrays on the new enclosure, one for Bays 1-7, the other for Bays 8-14. Is there any reason that we need to do this? My plan was to have the entire expansion shelf be 1 array, then create RAID 6 logical drives from that. I don't understand what splitting drives into separate arrays gain us. We don't have dual controllers, so there's no benefit there. Thanks, CC

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• Inconsistent slow DB connect times

  - by mcryan

  I have an app that shows significantly increased load times every 5 minutes. We use New Relic and I've been able to identify that every slow request is due to our DB connect functions. I've looked through our frontend servers and db servers and have ensured that there are no cronjobs running every 5 minutes - though the increase comes every 5 minutes without fail. I feel like I've tried everything I can to isolate this but I'm not having any luck. It is not coming from a cronjob, there is no cache expiring every 5 minutes, etc. What else could I check, and does anyone know of anything that could cause this sort of behavior? For what it's worth - our stack includes Apache, PHP, MySQL, Varnish and Memcache. SQL and memcache are running on dedicated servers and we have a number of frontend servers behind a load balancer, each running Apache and Varnish. Spike every 5 minutes: And it's always db connect (in red) taking up all of the time:

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• How do I prevent users from entering a blank value in an Excel sheet?

  - by Tola Odejayi

  I want to restrict users to entering either just 0 or 1 in an Excel 2007 sheet. I use the Data Data Validation dialog to do this, but I'm finding that it doesn't stop them from entering blanks. What I would like is for there to be a prompt when they enter blanks, just like the one that appears when they enter any other non-blank data that is not 0 or 1. I plan to fill the sheet with 0s before applying the validation, so there should not be a problem with erroneous data. Also, I'm open to using VBA to fix this problem.

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• How to maximize parallel download from S3

  - by StCee

  I got a lot of images to load from Amazon S3 on a single page, and sometimes it takes quite some time to load all the images. I heard that splitting the images to load from different sub-domains would help parallel downloads, however what is the actual implementation on that? While it is easy to split for sub-domains like static,image, etc; Should I make like 10 sub-domains (image1, image2...) to load say 100 images? Or is there some clever ways to do? (By the way I am considering using memcache to cache the S3images; I am not sure if it is possible. I would be grateful for any further comments. Thanks a lot!

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• Problem with the hosts file in Windows XP

  - by waldev

  I have a computer with Windows XP SP2 with a weird problem. The hosts file doesn't work. No matter what I do, adding or removing entries in the file doesn't make any difference, pinging the added names times out. I tried flushing the DNS cache (using ipconfig /flushdns) but that didn't work, I even tried to restart the DNS client service but that made no difference too. Removing entries also has no effect, I ping the names and I get a reply. Help!!! Edit: Thanks for your answer guys, but the problem is more complicated than this. It seems I'll have to reinstall Windows.

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• nginx serves broken characters

  - by Andrew123321

  I have nginx 1.2.0-1 on debian 6.0.5. I have an empty file (let's say test.css). I add A and newline, works fine, B and newline, works fine,... D, works fine. I add E and I got three broken characters ("???"). When the file has got more content nginx would usually "cache" it and then output the cached file minus some characters plus some of these broken characters. Do you have any idea how to deal with this? Thank you

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• Has anyone seen an HTTP 500 error when HTTPS traffic going through Pound Proxy forwards to an HTTP page?

  - by scientastic

  We have Varnish as our load balancer and reverse proxy cache for normal HTTP traffic. For HTTPS traffic, we use Pound proxy to unwrap the SSL and forward to Varnish, which then forwards to the back-end servers. This is used for our "checkout" process to encrypt credit card info in transition. However, on the last stage of checkout, users are always getting an HTTP 500 (Internal Server) error. It doesn't seem to be due to our back-end app server, by all tests I've tried. Does anyone know anything about how that transition works-- the transition back from HTTPS to HTTP and the interaction between Pound and Varnish-- and why it might cause 500 errors?

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• Recommendation for hardware upgrade: thin clients? Or...?

  - by Alex C.

  I work for an animal shelter in Upstate New York. We have about 50 machines running XP Pro. They're connected to a Windows network with a domain. About half of these computers are used for nothing more than using two web-based apps -- one to keep track of our animals, the other to process credit cards. Having a full-blown desktop PC seems like overkill for this purpose. The PCs are three-to-five years old, and I'd like to come up with a plan to upgrade the hardware. Our donations are down (not surprising, given the economy), so cost is a big factor. Can people recommend some options? Some sort of thin client, maybe?

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• Some Domain Clients unable to access certain websites

  - by Shaunie

  I have a small domain around 20 clients with a 2003 R2 SP2 DC. Most of my clients can browse the internet freely and dont have a problem. However a couple are reporting problems accessing certain sites. IE: Hotmail, skyscanner, bbc news They can browse the sites sometimes then other times they get 408\409 errors. other machines in the domain can access these sites. I have cleared out dns cache on these machines modified external dns servers on the DC still to no avail. The main issue is the person not able to access skyscanner uses it several times a day to book flights for employess going on leave or returning to work. both clients are running XP SP3 though one machine is getting change for one running win7 shortly. Any advice greatly appreciated. thanks

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• Single PC Satellite Office Firewall

  - by Carl

  We are setting up a small, single PC office about 200 miles away. We plan on getting a cable internet connection but need some advice on a sufficient firewall. We would like to keep it under $100 if possible. 2 options we are considering are: Cisco RVS4000 (got some bad reviews) Linksys WRT120N (running DD-WRT) We need the ability for VPN but other than that we don't need anything special. We just want to keep that PC as safe as possible but easily maintainable because most work will be done remotely. What suggestions or solutions can you recommend for this application?

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• What if any free video player for windows can I set a custom frame buffer for streaming over the wifi?

  - by user268883

  I currently use DAUM PLayer (Pot Player) but I have problems streaming video to my laptop unless it is plugged into the network. An easy fix (so I thought) would be to find a player were I could adjust the cache / buffer so say 5 mins+ is read to the local Hdrive and then played from there... I can not work out how to do this in any player I have VLC, MPCHC and DAUM installed. All I want to do is increase the file buffer so X amount of the networkfile is copied to the local drive and then played... so all stuttering is stopped? How do I do this?

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• Mysql showing some high spikes

  - by user111196

  We one mysql server suddenly the access to it becomes slow of out sudden. So I read some place they said maybe due to var size is it? I am not too sure any idea how to check the root cause of it. The cpu is like nearly 150%. Any indication on it. I have tried this so far. du -sh * 4.0K account 67M cache 4.0K cvs 16K db 8.0K empty 4.0K games 4.0K gdm 148G lib 4.0K local 16K lock 624M log 0 mail 4.0K nis 4.0K opt 4.0K preserve 400K run 298M spool 4.0K tmp 359M www 12K yp

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• How can we recover/restore lost/overwritten data in our MSSQL 2008 table?

  - by TeTe

  I am in serious trouble and I am seeking professional advices here. We are using MSSQL server 2008. We removed primary key, replaced exiting data with new data resulted losing our critical business data in its child tables on MSSQL Server. It was completely human mistake and we didn't have disk failure. 1) The last backup file was a month ago which means it is useless. 2) We created Maintenance Plans to backup our database at 12AM everyday but those files are nohwere to be found 3) A friend of mine said we can recover from Transaction Logs. When I go to TaskRestore Transaction log is dimmed/disabled. 4) I checked ManagementMaintenance Plans. I can't find any restored point there. It seems that our maintenance plan hasn't been working. Is there any third party tool to recover lost/overwritten data from MSSQL table? Thanks a lot.

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• Is the quadro 4000 still worth it's price? [closed]

  - by aknewhope

  I am going to be purchasing a quadro graphics card for learning 3d CAD at work. It's not critical I have it right now otherwise I would just buy the current 4000 (PC). I am buying this with my own money and am concerned Nvidia will release a new Quadro 4000 sometime in the near months. Is the current 4000 still worth it's price tag at $700.00? If i were to purchase it, how long would it be useful? I am going to be running E-PLAN, SOLIDWORKS, DRAFTSIGHT, MASTERCAM. My computer is a second generation i7-2600k with z68 chipset (intel DZ68BC mobo).

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• DNSCache excesive memory usage Windows Server 2008 R2

  - by MikeT

  We are having an issue with the dnscache service where its memory usage is becoming excessive (~6GB) after a week or two. Restarting the service frees this memory but performing ipconfig /flushdns does not, an ipconfig /displaydns shows aprox 15-20 entries in the cache. We have checked and there appears to be aprox 150 DNS queries per second taking place but I would not expect this to have the effect of causing this memory issue. I have tried to search MSDN for hotfixes or bug reports but I could only find a reference to a memory leak in windows 2003. can anyone suggest how to proceed.

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• How Do I enable Safe Asynchronous Write With NFS?

  - by Joe Swanson

  The NFSv3 documentation talks alot about the concept of "safe asynchronous writes" (last bullet of A1): http://nfs.sourceforge.net/#section_a This is NOT referring to the sync/async option in the server exports file (as the async option in the exports file is NOT safe). As I understand it, safe asynchronous writes is a hybrid between the sync/async exports option. It allows for a server to reply back without flushing to stable storage immediately, but the client will not remove the write request from cache until it has received confirmation that it has been committed to stable storage (and also detects if the server looses power/reboots). I believe that this option is set on the client side, but I have not come across any documentation that shows how to do this. Any ideas?

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• Missing Desktop Icon Labels in Windows 7

  - by Buzzedword

  Hey guys. Big problem that has been bothering me to no end. My desktop icons have been stripped of their icon labels, and nothing seems to be recovering them. To be clear, when I attempt to rename, the text shows up, and when I view my desktop in an explorer window, all text is preserved. System restore to a stock state will not recover. No changes have been done to the computer-- no installs or downloads for two weeks prior to this error. Rebuilt the icon cache, still no response. Anybody know what can be causing this problem? Screenie below. Thanks in advance. OS: Windows 7 Enterprise 64-bit Profile: Local, non-roaming Image: http://img688.imageshack.us/img688/5152/capturemr.png

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• Understanding RAM usage on Linux

  - by stebbo

  I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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• Use `dd` linux program to save / recover a disk's MBR

  - by Graduate

  I have an Ubuntu OS installed on my laptop. I want to install Windows 7 as well to another disk partition (I will do it by recovering it from a special partition on my laptop). After installing Windows, I want to recover my hard drive MBR to be able to load Ubuntu. I have a plan to use linux dd program: 1) (Before installing, perform this command in Linux) dd if=/dev/sda of=/home/user/mbr_backup bs=512 count=1 2) (after installing, load Ubuntu Live CD and launch this) dd if=/home/user/mbr_backup of=/dev/sda bs=512 count=1 3) Load Ubuntu on PC and re-configure the GRUB2 to be able start Windows I need your advice, I want to be sure I won't damage the disk (it's partition table).

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