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• C# sends SQL data 4 times less from one box than from another

  - by Bobb

  W2003, .NET 3.5, SQL 2008 I have prod and UAT app servers deployed in 2 different data centres. I have a C# app which reads text file, parse the text and sends the data to the SQL in bulk. SQL server is in US and the app servers are in London (but in different places). All POPs have dedicated network connections. There is no public internet involved. When the app runs on UAT server I can see in Perfmon that the Send byte/sec is x4 higher than from production server. My estimate is that one server outputs at 1 MB/s and the other at 250 KB/s rate. My suspicion immediately is that there is a router on one of the DCs which shapes traffic or does QoS limitation on traffice from London to US. However support and Windows team and networkig team all are saying that there are no differences in neither networking config on the 2 DCs nor NIC config on the 2 app server... How to find out why is the networking bottlneck is 4 times tighter in one place than in the other? What can I do about it?

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• VirtualBox management interface unreliability

  - by Arlen Cuss

  I'm using VirtualBox 3.2.8_OSE with 20 VMs running, and everything's going fine. I find that if I hammer the VBoxManage interface, all sorts of interesting things happen, usually necessitating either a restart of the VM in question, or of all VMs. For instance, if I use VBoxManage guestcontrol execute to run processes, after a few hours of using it maybe once or twice a minute on any given VM, it'll mysteriously start reporting VERR_NOT_IMPLEMENTED and refusing to do anything—sometimes trying to restart /usr/sbin/VBoxService on the VM itself will get it back in working order, but often it won't, and in the meantime, no data can be collected using VBoxManage. Such data includes the VM's IP, so if I hadn't recorded it earlier, I'm usually in trouble and have no option but to portscan the network for it, or kill the VM's process on the host manually and restart it. This one I haven't narrowed down yet, but it seems that even using VBoxManage guestproperty get (to retrieve a machine's IP) frequently and rapidly is enough to cause all VMs' management interfaces to die. The processes are still running fine, but VBoxManage reports them all as "powered off". In the meantime, another process somewhere in the system seems to have decided that their being powered off means they need to be powered on again, and suddenly I have 2x the number of VBoxHeadless processes running than I used to. Has anyone else seen behaviour like this? Is there any workaround? This is a serious impediment to my work, as I've had to resort to a lot of (hacky) caching of data and rate-limiting how often I call VBoxManage, just in case I accidentally bring 20 VMs to their knees.

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• High speed network configuration

  - by Peter M

  Sorry if this seems to be a stupid question, I'm not sure how to specify what I want to know when checking google. I will have 2 or 3 devices pumping out data on a 100Base-T port. The combined data rate of all devices is about 15KB/S which exceeds the optimal 100Base-T channel capacity (12KB/S), but well within the realms of a 1000Base-T connection. Each device will be sending a burst of data in the form of an FTP transfer to a common, single host computer in a sequential manner ie: Device A establishes FTP connection and transfers data Device B establishes FTP connection and transfers data Device C establishes FTP connection and transfers data It may be that the A&B, B&C and C&A transfers overlap in the time domain to some extent. There will be minimal traffic going back from the computer to each device (in general what ever is needed to support the FTP transfers), and the network will be dedicated to transferring data between these devices and the host computer. Is it possible to use a switch to combine the multiple incoming 100Base-T streams into a single outgoing 1000Base-T stream? if so what features in a switch should I be looking for? Or would it be better to have 3 physical point-to-point 100Base-T dedicated connections between each device and the host computer? (thus having at least 3 physical Ethernet interfaces on that computer) Note that I can't change the interface on the devices, but I am free to choose the network and host computer configuration. Thanks for you help Peter

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• Is there a way to make Skype show my contacts instead of my history in the sidebar?

  - by Paperflyer

  <rant> that new Skype on OSX is so amazingly awful its not even funny...</rant> Alright then, so, the most amazing feat of the new Skype version 5 is that whenever it starts up, it immediately shows me just about the most useless information possible: A log of my last conversation. Chances are, the last thing I did was to make a Skype call so all Skype shows me is a long list of Call Started and Call Ended. Amazingly useful. Actually, I probably started up Skype to make a call to someone, so the information I would like to see is the list of available contacts. Now the best thing would be to actually put this list in the sidebar, where it would be readily available no matter what I was doing last. Instead, Skype puts a history of all recent conversations there which might or might not contain the desired contact. At any rate, I have to scan that whole list to search for the desired contact every time I open up Skype, then I find out that the contact is not in there, hit the contacts icon in the top left and then finally can start making the call. Is there a way to just put the list of contacts in the sidebar and make Skype behave again?

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• Trouble in Team Viewer VPN Connection

  - by Sumit Pal

  I have completed initial vpn connection setup. It has connected. I have tested with ping and it is ok. My problem is, when I want to start file transfer in VPN it asks for username & password. So what is the user name? I have tried giving Computer-Name/User-Name. I have found my Computer Name by going to Control Panel/System/ & clicking 'Computer Name' tab & username from user accounts or it is shown when I login in windows account (Please correct me if the above procedure is wrong). But what is the password? I have tried giving the account password but it always give 'The username or password is incorrect.' My Question: How to find the username & password? For Information: a) I have Team Viewer 7 installed in one Windows XP PC & one Windows 8 PC. I like to create a secure connection between these two PCs. b) The two PCs are connected in the same local network via a router. Please ask if you need additional information.

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• How do I share a complete XP disk so it can be seen from a Windows 7 system? (To move all files to a

  - by Ian Ringrose

  This should be easier! (both computers can see the internet etc so I know the network it’s self is working) I have a normal home network with a Windows XP machine on it and the new Windows 7 (64 bit) machine. So I can transfer the files to the new Windows 7 machine, I wish to share the complete disk (and all files) from the Windows XP machine and access them from the Windows 7 machine. Is there a step by step set of instructions for doing this anywhere? So fare I have: put both computers into the same workgroup put the windows 7 machine into work network mode so it can see the XP machine in the work group shared the XP disk as read only But when I try to access a lot of the folders on the XP disks, I am told I am not allowed to access them. (I was not asked for any passwords by the windows 7 machine when I accessed the XP machine. The XP machine just has its default account with no password set on it) The XP machine runs XP home and hence has "simple file shairing" turn on. So it seems that even if I create a admin account (with password) and connect with that account, it still comes in as "guest" on the XP machine. Chooseing to share the folder I want access to rather then the top of the disk drive seems to work, but is a pain as I need to share each user's folder with a different share name. If the new computer was not a laptop, I would just plug the hard disk from the old machine into it, but being a laptop I don't have that option.

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• Frequent freezes with constant disk activity on SSD netbook

  - by SamsLembas

  I am running Arch Linux on an HP Mini 1000 with a SSD. The machine is a little under a year old and fairly heavily used. About a month ago the machine started freezing up. During the freezes, the system is almost completely unresponsive, seemingly especially for disk-intensive tasks such as launching an application for the first time since reboot. The disk activity led is always constantly illuminated during the freezes. After somewhere between 30 sec and 3 minutes, the machine returns to normal operation. I am pretty sure that the SSD is the source or the problem. Iotop reports a disk transfer rate of 0 during the freezes, so I think it must be getting "stuck" and simply not performing any r/w during the time. I can't seem to find any information on these symptoms on the Internet, so any input on exactly what might be the cause of this would be greatly appreciated. The machine is under warranty, but I would rather not deal with HP until I actually know what is going on. Thanks.

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• Apache https is slsow

  - by raucous12

  Hey, I've set apache up to use SSL with a self signed certificate. With http (KeepAlive off), I can get over 5000 requests per second. However, with https, I can only get 13 requests per second. I know there is supposed to be a bit of an overhead, but this seems abnormal. Can anyone suggest how I might go about debugging this. Here is the ab log for https: Server Software: Apache/2.2.3 Server Hostname: 127.0.0.1 Server Port: 443 SSL/TLS Protocol: TLSv1/SSLv3,DHE-RSA-AES256-SHA,4096,256 Document Path: /hello.html Document Length: 29 bytes Concurrency Level: 5 Time taken for tests: 30.49425 seconds Complete requests: 411 Failed requests: 0 Write errors: 0 Total transferred: 119601 bytes HTML transferred: 11919 bytes Requests per second: 13.68 [#/sec] (mean) Time per request: 365.565 [ms] (mean) Time per request: 73.113 [ms] (mean, across all concurrent requests) Transfer rate: 3.86 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 190 347 74.3 333 716 Processing: 0 14 24.0 1 166 Waiting: 0 11 21.6 0 165 Total: 191 361 80.8 345 716 Percentage of the requests served within a certain time (ms) 50% 345 66% 377 75% 408 80% 421 90% 468 95% 521 98% 578 99% 596 100% 716 (longest request)

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• Cheap Solution for Routing a Toll Free Number to a Standard POTS Number

  - by VxJasonxV

  I do some technical work for an Internet Radio Show/Podcast, and need to fix something that has been broken for a while. The hosts have a Skype-In number to take listener calls, and for convenience sake, I bought and paid for a toll free number for a period of time. I used to use Asterlink for routing calls, but they folded and sent my number to OneBox, but they're ridiculously expensive by comparison. I'm looking for a cheap solution for this one simple task. Forward toll free calls to a skype-in number. The definition of cheap is as cheap or cheaper than Asterlink was. I paid something like $2 a month, and then the termination/call rate, which was a fraction of a sent for termination, and only whole cents after some serious time on the call. A $20 preload lasted me months at a time. I don't want to be upsold too, I want a simple web based management screen (CDR/stats are fun!), and obviously, it needs to be reliable. What vendors out there are you a fan of that solves this need?

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• Windows VPN always disconnects after < 3 minutes, only from my network

  - by hemp

  First, this problem has existed for almost two years. Until serverfault was born, I pretty much gave up on solving it - but now, hope is reborn! I've set up a Windows 2003 server as a domain controller and VPN server at a remote office. I am able to connect to and work over the VPN from every windows client I've tried, including XP, Vista, and Windows 7 without issue, from at least five different networks (corporate and home, domain and non.) It works fine from all of them. However, whenever I connect from clients on my home network, the connection drops (silently) after 3 minutes or less. After a short while, it will eventually tell me the connection has dropped and attempt to redial/reconnect (if I've configured the client that way.) If I reconnect, the connection will re-establish and appear to work correctly, but again will silently drop, this time after a seemingly shorter time period. These are not intermittent drops. It happens every single time, in exactly the same way. The only variable is how long the connection survives. It doesn't matter what type of traffic I send. I can sit idle, send continuous pings, RDP, transfer files, all of that at once - it makes no difference. The result is always the same. Connected for a few minutes, then silent death. Since I doubt anyone has experienced this exact situation, what steps can I take to troubleshoot my evanescing VPN?

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• Large, high performance object or key/value store for HTTP serving on Linux

  - by Tommy

  I have a service that serves images to end users at a very high rate using plain HTTP. The images vary between 4 and 64kbytes, and there are 1.300.000.000 of them in total. The dataset is about 30TiB in size and changes (new objects, updates, deletes) make out less than 1% of the requests. The number of requests pr. second vary from 240 to 9000 and is dispersed pretty much all over, with few objects being especially "hot". As of now, these images are files on a ext3 filesystem distributed read only across a large amount of mid range servers. This poses several problems: Using a fileysystem is very inefficient since the metadata size is large, the inode/dentry cache is volatile on linux and some daemons tend to stat()/readdir() it's way through the directory structure, which in my case becomes very expensive. Updating the dataset is very time consuming and requires remounting between set A and B. The only reasonable handling is operating on the block device for backup, copying, etc. What I would like is a deamon that: speaks HTTP (get, put, delete and perhaps update) stores data it in an efficient structure. The index should remain in memory, and considering the amount of objects, the overhead must be small. The software should be able to handle massive connections with slow (if any) time needed to ramp up. Index should be read in memory at startup. Statistics would be nice, but not mandatory. I have experimented a bit with riak, redis, mongodb, kyoto and varnish with persistent storage, but I haven't had the chance to dig in really deep yet.

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• Mass-migrating from POP3 to Exchange 2010, how do I copy mailboxes?

  - by Erik P. Skaalerud

  I'm in the process of planning our migration from an internal hosted POP3-server (dovecot) to Exchange 2010. We're using Outlook 2003 for the moment, but will soon upgrade to Outlook 2010. The big problem is that we have about 50 computers here in our HQ, plus ~30 clients in branch offices (wich will get their Exchange migration later sometime). I'm the only IT personel, and having to go around and manually set up Outlook and copy over their PST contents is not a option I'm looking for. Some users have set outlook to keep messages for X number of days on the POP3 server, others have not. Using a POP3 connector to transfer over the mails is not a viable option. Here is what I've done so far: Created a transform for the Office 2003 administrative installation point Created a .PRF file to modify any existing e-mail account to switch over to Exchange (including the RPC-encrypt hotfix described in MSKB 2006508) Tested both transform and PRF, both works Created a test-OU and GPO containing the Office 2003 installation with transform applied, also works My big question is: How can I force Outlook to import any existing .PST into the new Exchange mailbox when the user starts up Outlook for the first time after the MST/PRF have been applied? Is this possible?

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• 1080p monitor: connected through VGA - perfect, HDMI - awful

  - by develroot

  When I connect my 23" monitor (1920x1080) to my pc through HDMI, I encourage some problems. It's not full screen That's it. There are ~1cm black borders on right and left side and ~0,5cm black borders on the top and the bottom of the monitor. That's pretty frustrating. I tried adjusting overscan, but I can't mannualy type the % of overscan that I need. I can only select between ex. 8 and 10% in AMD Vision Engine Control center, but what I need is 9%. Next, even if i select 10% and the image fits all the corners, but after log off all the settings are lost and I have to do it again and again. Text, images, everything looks blurry That surprised me a lot. Should'nt HDMI quality be better than VGA's one? When connected through HDMI, the text isn't readable. It's like a very low refresh rate, although i'm running at 60Hz. Also the text has something like little shadows, very very annoying. Are there any tips to get the same quality as with VGA, with HDMI ? (running on integrated ATI Radeon HD4200, which, appearently, is the best card I have ever seen in terms of integrated ones)

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• break Folder Protection, Folder Guard Lock or Folder in Windows XP?

  - by SonyAdi

  when I'm making a new partition by the partition magic. Then all of a sudden power failure. Unfortunately because my computer is not equipped with UPS (Power supply Uniterruptible), my computer finally died, too. When power is restored, I tried to turn on the computer. Suddenly my computer can not boot normally into windows. Option through safemode and others all I've tried. The result fails, can not boot at all, into safe mode also can not. And I know the cause. Partition Magic did not finish the work and stopped in the middle of the road and cause the transfer of data files or stopped, finally file2 any default windows were destroyed as well. Unfortunately my important data I store in my document. Finally, I take my hard drive to a friend. Hopes to open a computer hard drive through friend, at least I could save my important data, and then I can install window again by reformatting my hard drive is first. I read the hard drive in explorer my friend, complete with their data, but the data of my important data in my document can not get to go because it requires administrator privileges or the original user's default start my windows (my computer) to open my document folder tersebut.Ini actually very similar to the work or Folder Protection Folder Guard. result I was disappointed and almost desperate to get back my important data is. how do i break Folder Protection, Folder Guard Lock or Folder in Windows XP?

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• sysbench memory test on ec2 small instance

  - by caribio

  I'm seeing a problem with sysbench memory test (the default version that's compiled in). This is on Ubuntu Maverick, sysbench installed via apt-get install sysbench. Running the same thing on Ubuntu @ Rackspace worked just as expected. While the CPU and I/O tests worked fine on EC2 servers, the memory test just runs without doing anything (notice the 0M in the test results). The instance used was the publicly available 'stock' Ubuntu image with no changes to it: ./ec2-run-instances ami-ccf405a5 --instance-type m1.small --region us-east-1 --key mykey Supplying more arguments (such as: --memory-block-size=1K --memory-total-size=102400M) didn't help. What am I doing wrong? Thanks. sysbench --num-threads=4 --test=memory run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 4 Doing memory operations speed test Memory block size: 1K Memory transfer size: 0M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 0 ( 0.00 ops/sec) 0.00 MB transferred (0.00 MB/sec) Test execution summary: total time: 0.0003s total number of events: 0 total time taken by event execution: 0.0000 per-request statistics: min: 18446744073709.55ms avg: 0.00ms max: 0.00ms Threads fairness: events (avg/stddev): 0.0000/0.00 execution time (avg/stddev): 0.0000/0.00

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• Transfering Files to server IP and port

  - by Mason

  I need to transfer files from my local computer on windows 7 to a server running linux. I access the server with putty through ssh at a specific IPv4 address and port number. I've attempted using the pscp command from my local computer but was denied access by the server. "Fatal: Network error: Connection refused" c:>pscp test.csv userid@**IPv4_Addres***:Port# /path/destination_file_name. Either the server blocks all pscp attempts from unauthorized users (most likely my laptop included) or I used the command incorrectly. If you have experience using this command, where exactly will the file get transfered to, I'm assuming that the path destination starts at my home directory in the server. Also if you have any other alternative methods of transfering the files let me know. Update 1 I have also tried using WinSCP however I got permission denied for that as well, it looks like the server will not let me upload or save files. Solved I had a complete lapse of memory and forgot about sudo (spent too much time with scripts the last 2 months), so I was able to change the permissions to allow external editing. Thanks for all the help guys!

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• Passwortgeschützter Traffic-meter

  - by UncleBob

  Hallo erstmal, ich habe hier ein kleines Problem für das ich bis jetzt noch keine Lösung habe. Ich lebe in Bosnien und teile hier die Internetverbindung mit der Vermieterin, und wie es in Bosnien so ist haben wir keine Flatrate, sondern eine 15 Giga traffic limite. Das wäre eigentlich mehr als genug, wenn der Sohn der Vermieterin nicht immer überziehen würde, sodass die Rechnungen immer ziemlich teuer ausfallen. Ich habe ihm bereits ein Messprogramm installiert, aber das schaltet er offensichtlich aus sobald er in die Nähe seiner Limite kommt und behauptet dann die Limite nicht überzogen zu haben. Ich brauche also mindestens ein Messprogramm das Passwortgeschützt ist und/oder im Log Zeiten vermerkt wärend denen es nicht eingeschaltet war. Noch besser wäre ein Programm das ihm den Netzzugriff einfach abklemmt wenn er seinen Anteil überschreitet, also eine Mischung aus Trafic-meter und Parental Guard. Kann mir da jemand weiterhelfen? Gtranslated version Hi first, I have a small problem for which I yet have no solution. I live in Bosnia and share the Internet connection here with the owner, and how it is in Bosnia, we do not have a flat rate, but a 15 Giga traffic limite. That would actually would be more than enough, if the son of the landlady does not always cover so that the bills always turn out quite expensive. I have it already installed a monitoring program, but he apparently turns out as soon as he comes close to its limit and then claims not to have the limit excessive. I therefore need at least a measurement program that is password protected and / or in the log notes During low periods where it has not turned on. Even better would be a program that disconnects him from accessing the network if it simply exceeds its share, ie a mixture of Traffic parameters and Parental Guard. Can someone help me there?

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• Can Internet data be used by malware when PC off?

  - by Val

  I have noticed over the last month that my off peak data has been used at a rate of approx 350MB per hour - this has meant that I have gone over my quota and slowed down by my ISP to 256k. There is no one in the house using it (2am-8am is my ISPs off peak hours) at that time. My PC and other wireless devices (ipad and iphone) are turned off. I have changed the wireless password on my modem 3 times and it is now 30 digits long. So I don't think someone else is using my wireless access between 2-8am. It has been suggested by my ISP that I may have malware/spyware on my computer. Sorry for my ignorance, but can malware still run if the PC is off? I did look at my modem's log and followed an IP address to a service called Amazon Simple server Storage. Could this company possibly be the culprit? I am not too tech savvy, so any assistance appreciated. I have run a barrage of spyware cleaning software eg malware bytes; spy bot etc.... Cheers Val

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• When a server IP changes, do exising TCP (e.g. http/mysql) connections remain running

  - by Luke Cousins

  We have some PHP-FPM servers and when they need a database connection, they connect to an HAProxy server which selects them a database server to use and the connection opens. When we then want to perform some maintenance on the HAProxy servers (such as config changes requiring an HAProxy restart), the process is as follows: Shutdown Keepalived on the HAProxy server Wait for the floating IP to transfer to the backup HAProxy server (also running Keepalived) Wait until HAProxy stats is reporting just one connection (us checking how many connections there are) Restart HAProxy Restart Keepalived As step 2 occurs, what will happen to the open mysql connections at that point? According to this TCP Sessions and IP Changes question the connections will be dropped. Is this really the case? If so, what, if anything, can be done to prevent this happening? Can the connection be in some way forced to use the main (non-floating) IP of the server? We also have a similar setup with two Nginx servers with Keepalived running on them and we were planning on doing the equivalent process. If we do, the same question applies - what happens to the existing http connections when the IP moves to the other server? I appreciate your help.

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• central apache log analysis of many hosts

  - by Jason Antman

  We have 30+ apache httpd servers, and are looking to perform analysis on the logs both for historical trending and near "real time" monitoring/alerting. I'm mainly interested in things like error rates (4xx/5xx), response time, overall request rate, etc. but it would also be very useful to pull out more compute-intensive statistics like unique client IPs and user agents per unit of time. I'm leaning towards building this as a centralized collector/server/storage, and am also considering the possibility of storing non-apache logs (i.e. general syslog, firewall logs, etc.) in the same system. Obviously a large part of this will probably have to be custom (at least the connection between pieces and the parsing/analysis we do), but I haven't been able to find much information on people who have done stuff like this, at least at shops smaller than Google/Facebook/etc. who can throw their log data into a hundred-node compute cluster and run Map/Reduce on it. The main things I'm looking for are: - All open source - Some way of collecting logs from apache machines that isn't too resource-intensive, and transports them relatively quickly over the network - Some way of storing them (NoSQL? key-value store?) on the backend, for a given amount of time (and then rolling them up into historical averages) - In the middle of this, a way of graphing in near-real-time (probably also with some statistical analysis on it) and hopefully alerting off of those graphs. Any suggestions/pointers/ideas, to either "products"/projects or descriptions of how other people do this would be greatly helpful. Unfortunately, we're not exactly a new-age-y devops shop, lots of old stuff, homogeneous infrastructure, and strained boxes.

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• Windows thinks outgoing connections are incoming connections?

  - by Slayer537

  I have a rather weird issue.. I'm trying to configure Windows Firewall to block all outgoing connections to a certain app, but allow all incoming. This app is used to transfer files across a network. The reason for this type of setup is to only allow certain users (IP Address) access to the files I have, but to still allow others to see what's available. Since Windows Firewall defaults to allowing all outgoing connections, I made a rule to deny all outgoing connections that were not in the IP ranges I specified. For the incoming connections, I'd like to leave it at allow all, but at the moment it is set to only allow the connections that also have outgoing permissions set. If I blanket say allow all incoming connections, I observe that unauthorized IP Address are able to actually download files, even though their IP was blocked in the outgoing connections. To shed a little more visibility on this, I used NetLimiter to see what was going on. NetLimiter showed me that the connection was an incoming connection. Shouldn't this be an outgoing connection, as I am uploading files to them, not the other way around? Is there a way to make the connection type be correct and show up as outgoing instead of incoming?

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• IIS FTP 7.5 Data Channel Problem (SSL)

  - by user59050

  Hey there I wonder if anyone can get me in the right direction. I am setting up both a FTPS Client and Server, FTPS Server using Microsoft’s iis FTP 7.5. On the client side it will be running on Linux and I am using M2crypto for the openssl wrapping (python). I am worried the problem is on the server side (iis7.5) due to the following discovery : If I host using Filezilla with BOTH the control and data channel being forced to be encrypted it works 100% (100% file transmission), if i use iis as the server everything works up to the point when the data channel takes over... i.e. all data of the retrieved file is already received correctly in my basket! The ftp server just won't send the final '226 Transfer complete.' on the cmd socket. Why? If i force the client or server to close the connection the file is 100% intact....If i use iis 7.5 with forced encryption on control channel all works 100% as long as i don’t force data channel... Here are some screenshots to demo this... Client View after Kill Client : pics @ http://forums.iis.net/p/1172936/1960994.aspx#1960994 Summary : We can establish the connection, do directory listings, start the upload, see the file (0bytes) created on the server but then the client hangs. If we terminate the client, the uploaded file on the server suddenly jumps up to full size.

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• VirtualBox how to merge arbitrary snapshot into base vdi

  - by jmathew

  I botched a transfer of a VM from one harddisk to the other. Now I'm left with the base vdi and a whole bunch of snapshots. My steps Copied old VM directory over to new HDD Deleted old VM and added new VM using using Machine-add and providing the old XML file Couldn't add base vdi file due to conflict so changed the UUID of base vdi with VBOXMANGE.EXE internalcommands sethduuid Attempt to rollback to a snapshot, but it seems the VM is looking for the snapshots on the old HDD (which is formatted and gone) This is the error (networked is the name): Failed to restore the snapshot networked of the virtual machine lfs. Could not open the medium 'H:\vm\ft.vdi'. VD: error VERR_PATH_NOT_FOUND opening image file 'H:\vm\ft.vdi' (VERR_PATH_NOT_FOUND). Result Code: E_FAIL (0x80004005) Component: Medium Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd} The old HDD was drive H: the new one is drive N: How can I modify the snapshots/VM to look in N:\vm\ft.vdi for the base vdi? I've already set the default settings in VirtualBox in general (default vm/vm snapshot location). Or if not that how can I merge the old snap shot with the base vdi given that the only things that have changed is the base vdi's UUID? Thanks

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• Notebook display problem (multiplication)

  - by SubniC

  Hi, I'm having some troubles with the display of a LG E500 notebook. The thing is that without any known reason the display starts to show the screen divided in eigth parts and each part show the display image as if I had a matrix of eigth displays :) I thought it could be some kind of refresh rate problem or driver related, but it is happening at boot-up as well and the BIOS. I got the computer completely unassambled yesterday and I check all the wires and connectors looking for something broken or unconected, but without luck... You can see a picture here of the problem (sorry for the low quality, but I think it illustrate the problem. EDIT 1: I uploaded a new pictrue, here you cans ee the problem better :) There are three horizontal lines that you can see just between the windows. You can see the grey line at the first moment you turn on the computer and the after the duplicated screens show up just like if they where arranged over a grid (over the horizontal lines...) I hope it makes any sense. Do you know what could be happening? or can you tell me what would you do? Thank you very much for your help.

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• SSD for swap on Ubuntu server

  - by grs

  Currently I am reading SSD reviews and I wonder how much exactly I will benefit if I move the 24 GB swap from 7200rpm HDD to SSD. Does anyone implemented swap space on SSD? Is this generally good idea? On a side note: I read that ext4 has much better performance if the journal is on SSD. Anyone with such a setup? Thanks! Edit: Here I will answer the questions posted: Occasionally, relatively rare I am hitting the swap. I know what the swap is for and that is better to get more RAM. When the server begins to swap its performance degrades (not a surprise). The idea is if I have few memory hungry processes running, to improve the overall system performance at that time, using SSD for swap, instead of slower rotational media. At the end - I want to be able to login faster and check the server state during swapping, instead of waiting on the login prompt. And of what I see SSD is cheaper per GB than RAM. Would I have better server performance during swapping (as rare it is) using SSD compared to HDD? Where 10k or 15k rpm HDDs would rate in this scenario? Thank you all for your quick and prompt answers!

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