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• Virtual Machine Performance - More RAM or More Processor?

  - by webworm

  When looking to improve Virtual Machine performance what would be better ... Increasing the available RAM or increasing the processor power? Here is my choice ... Core 2 Duo @ 2.4 GHz with 8 GB RAM and integrated graphics (Mac Book Pro 13") Core i7 @ 2.6 GHz with 4 GB RAM and 512 MB dedicated graphics (Mac Book Pro 15") I plan to run Windows x64 in the VM with SQL Server 2008, Visual Studio 2010, and SharePoint 2010. I am planning to run VMWare Fusion v3. I also didn't know if a dedicated graphics card makes a difference when using a Virtual Machine. Thank you.

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• Possible to write an implement of RAIDZ or RAIDZ2 for the MD driver in the Linux kernel?

  - by Pharaun

  I am curious on if it is possible to have an implement of RAIDZ and/or RAIDZ2 in the MD driver in the Linux kernel? From my understanding of it is that the RAIDZ version is equivalent to a RAID 5, and that a RAIDZ2 is equivalent to a RAID 6. The main difference is that the stripe size can be variable for RAIDZ as opposite to RAID 5/6 from my understanding, which helps performance. So what I am wondering is would it be possible to add this performance enhancing technique to RAID 5 & 6 in the MD driver in the kernel? Or is it tied too closely to how the ZFS works?

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• When to use Nginx PHP Fast CGI with a TCP socket instead of a UNIX socket?

  - by user64204

  I've followed this guide to setup PHP in FastCGI mode with Nginx. This guide describes 2 ways of doing it: TCP socket and UNIX socket. I've ran some Apache Benchmark on my locale machine and here are the results: Below tests ran multiple times to get better average statistics: $ ab -c 200 -n 100000 http://.... APACHE: 1800 req/sec NGINX (TCP socket): 2500 req/sec NGINX (UNIX socket): 15000 req/sec As far as I understand, there is overhead with using a TCP socket rather than a UNIX socket, hence the better performance with the latter. However I was not expecting such a performance difference given that the TCP socket is on the localhost, and therefore would like to ask the following question: Q: Given the huge performance gain with using a UNIX socket, what are the configuration scenarios where it would make sense to use a TCP socket instead?

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• Windows Server 2003 not automatically assigning drive letter to external drives

  - by Chris

  My newly rebuilt Windows Server 2003 doesn't automatically assign drive letters to external usb devices. I have to manually open the Disk Management Console and assign it a drive letter every time. It does this with two different drives in all USB ports. I have been doing some reading and I don't have any network drives, I have also already tried USBDLM and it doesn't seem to have made any difference. Specs: ProLiant ML150 G5 with Windows 2003 Enterprise and all updates installed. Any ideas on what I can try to resolve this problem would be greatly appreciated. Chris

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• How do I get 480i resolution for an external monitor in Windows 7?

  - by Carson Myers

  I'm trying to get a laptop video signal to my really old television, so that I can play movies on it. But the TV won't accept the video signal. I found the manual online, and apparently the output has to be 480i. But I don't know how to do that -- Windows 7 will only let me set the resolution down to 800x600. Even if I get it down to 640x480- is that 480i or 480p? How do I tell the difference? How do I switch between them? How do I get the resolution down so low in the first place?

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• Use Windows Briefcase from the command line

  - by Daniel

  I have a thumb drive on which I take many of my files with me. I would like to synchronize it with my computer automatically when I connect it. I currently have a script run every time I connect it so that I can do the many things that need to be done when it connects (check for updates to the portable applications, etc.). I want my synchronization utility to: Detect conflicts work correctly when I move files or change the folder structure tell the difference between a file that was deleted on one side and a file that was added on the other work from the command line or at least have a command that will open up a window provide a confirmation screen before doing anything The Windows Briefcase does all of these except the command line. Is there any program that does all of these, or is there a way to synchronize the briefcase from the command line?

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• How to verify if a clean windows 7 install was done or an upgrade over vista was what the tech did?

  - by Melody

  I'd like to know if the install was truly done as a clean Windows 7 or If the windows 7 was installed over the vista as an upgrade - 32 bit and ultimate verstion? I noticed hp game stuff (wild tanget or something ) during an virus scan and it was not suppose to be in a clean install...so now I'm wondering how to verify what kind of install Really happened/ Any help? I'd appreaciate knowing how to know the difference, if I was led to believe something that was not true...I paid for a clean install. Did I get that or not is my concern Thank you so much Melody

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• What kind of SSL Cert do I need and where do I get it?

  - by chacham15

  I want to have subdomains with SSL within my domain. The main difference is that each subdomain is hosted by a different person with a different public key/private key pair. Let me illustrate with an example: User send his public key and requests subdomain from foo.com User is added and assigned subdomain bar (bar.foo.com). Users public key is stored for future validation against bar.foo.com User goes to bar.foo.com and see's a validated SSL connection. From what I gather, this means that I need to create a CA, which is fine. The problem is that from what I recall, a CA needs a special sort of SSL Cert. How do I go about getting this?

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• Intel PRO/1000 Server NIC on Windows latency. How to measure?

  - by Bobb

  Please note - this question is about latency of the card itself. Not latency of internet or anything else. Thank you for your attention on this matter. It is often said that good server NIC does make difference compared to low grade cards and on-board Ethernet chips. I understand that on-board chip will likely consume CPU time and stand-alone card would use its own chip. Also server card would be faster than low-grade card. Are these 2 facts explaining most of the server cards advantages over on-board and low-grade cards ethernet? How would you measure latency on the card itself? I saw some reports stating some microseconds figures of NIC latency but I dont see how to measure that... Any advise will be appreciated.

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• Multiple servers acting like a single one with all the hardware?

  - by marc.riera

  Hello, by now I have 10 servers for hpc, power computing oriented. My users need to launch several processes using qmake. The users are used to work with ubuntu 9.10, and the software from the repositories is switable for them. I've deployed ubuntu 9.10 to all 10 servers (pxe rocks). By now we work with parallel-ssh and cluster-ssh, which allows as to launch the same process to all servers. With this tools this tools the servers remain as independent but with the same software and the same launched command. Now we would like to go to next step and see all the servers as a single one with all the resources from the other 9 as if was its resources. The difference would be substantial in time to process and also time to design the command to launch. Any advice on wich software to use will be very useful? Thanks

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• What does dd conv=sync,noerror do?

  - by dding

  So what is the case when adding conv=sync,noerror makes a difference when backing up an entire hard disk onto an image file? Is conv=sync,noerror a requirement when doing forensic stuff? If so, why is it the case with reference to linux fedora? Edit: OK, so if I do dd without conv=sync,noerror, and dd encounters read error when reading the block (let's size 100M), does dd just skip 100M block and reads the next block without writing something (dd conv=sync,noerror writes zeros to 100M of output - so what about this case?)? And if is hash of original hard disk and output file different if done without conv=sync,noerror? Or is this only when read error occurred?

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• Domain Computers Not Listed In Network

  - by Giawa

  Our network computers are all connected to a domain, and I can see them if I search the active directory (I can click 'search active directory' and then select 'computers' and then Find Now, and all of the computers will appear). However, the computers are not listed in the network browser on any of our computers (Win XP, Win7, Linux, etc) which are connected to the domain. DC is running Windows Server 2008 (Windows Server Standard) with a configured DNS and DHCP server. All of the IPs on our local network are static IPs, although I can't see how that would make a difference. I can still connect to computers on the network via \\computer_name, but I cannot browse them in 'network' or in 'my network places'. The computer browser service is not started on the DC, but I tried starting that and it had no effect. DC currently has the firewall configured as 'off' to try to debug this problem. Thanks in advance

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• What is the minimum delay between two consecutive RS232 frames?

  - by Lord Loh.

  I have been working on creating a UART on an FPGA. I can successfully transmit and receive single characters typed on PuTTY. However, when I set my FPGA to constantly write a large sequences of "A", sometimes I end up with a sequences of "@" or some other characters until I reset the FPGA a few times. I believe the UART on the computer looses track of the difference between the start bit and a zero. The delay between the two "A" is ~ 30us (measured with a logic analyzer) and the baud rate is 115200 8N1. Is there a minimum delay that must be maintained between two consecutive RS232 frames?

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• IPtables rate-limit, What are the differences between modules? Recent, Limit

  - by TechZilla

  I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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• Does SQLIO lie when run from a Hyper-V guest on a VHD?

  - by ScottStonehouse

  SQLIO seems like a useful tool. I thought it would be interesting to try to measure the speed difference between a physical disk and a VHD. So I ran SQLIO on the Hyper-V host on the physical drive. Results seemed reasonable. Then I ran it from the guest to test the vhd (on the same physical disk). I expected it to be a bit slower. But instead it was way faster - like 0ms average latency. So I'm trying to learn something here. It seems like hyper-v is fooling SQLIO somehow but I don't understand it well enough to figure it out. It's a dynamic vhd, no snapshots or anything, and the vhd is the only file on the disk. The physical disk is actually a two SAS drive RAID 1.

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• Is there a common X-Header for RFC 2821 "MAIL FROM"? Should it be DKIM signed?

  - by makerofthings7

  w.r.t. the difference between RFC2821 MAIL From and RFC2822 FROM I'm considering having my MTA add a header specifying what was sent in the MAIL FROM portion of the envelope. The RFC2821 header is used for receiving email bouncebacks, and is the header that is checked in SPF and some SenderID configurations. The goal is to make it easier for diagnostics and debugging by having this low level information in the email header. What is an acceptable name for this SMTP header? Should this header be signed by DKIM? Is there any reason why it shouldn't be signed?

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• Simulating network latency for localhost connection on Windows 7

  - by nitro2k01

  I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some trial and error. While it generally works, I can't seem to get it to filter localhost traffic. Even after adding a rule from any to any which affects external traffic, this makes no difference for local connections. I would appreciate if anyone knows how to simulate local latency using dummynet or a different tool. The tool should be able to simulate latency generically in IP packets, (TCP and UDP) and not be protocol specific.

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• 500 INTERNAL SERVER ERROR

  - by jude

  Hi, I have and old content database which i restored in my sharepoint 2007. But whenver i try to access web sites in my sharepoint i get error : 500 INTERNAL SERVER ERROR. I can see the old content database at :- Sharepoint Centre Admin-Application Management-Content databases. There is no difference in the version of the old content database. My current content database is working fine.Its just the old content database is not. What could be the reason? Thanks, Jude Aloysius.

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• How to make schema dumps comparable between Windows and Linux

  - by Jonathan

  I have two systems running, one on linux and the other on windows. From the linux box, I ran pg_dump against both systems and dumped the schema. pg_dump command: pg_dump -h HOST -U USER -s -f /tmp/out.sql DB_NAME After I removed all of the "--" comments, I diffed the files together. Diff output snippet, linux compared to windows: - ADD CONSTRAINT sys_c004775 FOREIGN KEY (ruleid) REFERENCES rule(ruleid); + ADD CONSTRAINT sys_c004775 FOREIGN KEY (ruleid) REFERENCES "rule"(ruleid); The linux dump does not quote any entities and windows does. Is this a function of some encoding or just of a difference between windows and linux? Is there an option in pg_dump to make the output more consistent?

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• balancing loudest and quietest speaker noises

  - by Dan

  It is hard for me to find the right volume for my computer to watch my dvd's on because it seems like most reasonable volumes become overwhelming at the loudest parts of a movie and it is hard to even make out the dialog at the quietest parts. I find I'm constantly adjusting the volume during the course of a movie. Are there ways to make the difference between the louds and the quiets not so extreme? (both computer related solutions and non-computer related solutions welcome). Like moving my speakers across the room and increasing the volume? or the opposite? Or would would the extremes be less noticeable if I used headphones? Are there movie players that might have more complex sound adjustment features? If there is a software solution out there for linux that would be great too. Thanks, Dan

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• SSL certs or intermediate for DMZ

  - by rex

  I've been tasked with deploying and managing load balancers covering internal servers and DMZ servers. I have no experience with this, and this is a first for my organization as well. Balancers are up, running, legit. Currently we are using a self-signed cert for Exchange/OWA. I know that we should have a cert signed by a CA, but the balancer has options for SSL cert or intermediate cert, and I'm unclear on the difference, or on which we need. We will be hosting Lync, Exchange and some custom apps in the DMZ. disclaimer: Apologies up front, I'm desktop support. I recently passed my Net+. It seems that has made me the network engineer in this organization.

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• Web Folder size/quota reporting tool?

  - by nctrnl

  I am currently using a Visual Basic script to determine how big the web folders are and what quota is decided for each folder. The quota is in no way a physical limit, just a value inserted by me to decide whether a user is using too much space or not. The script does the job quite neatly and sends an html file by mail on a regular basis. The problem is that it's such a hassle to insert new quotas since I have to fiddle around with the code. A central "control panel" with an overview and ability to insert new quotas would be more suitable. Is there any software that can do the following: Scan specified folder/subfolders Report the file size and present it in some sort of interface (could be a php/mysql solution) Ability to specify a quota and see the difference value ? It is really important that the quota handling is made simple so that some non-technician can handle this.

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• Web Folder size/quota reporting tool?

  - by nctrnl

  I am currently using a Visual Basic script to determine how big the web folders are and what quota is decided for each folder. The quota is in no way a physical limit, just a value inserted by me to decide whether a user is using too much space or not. The script does the job quite neatly and sends an html file by mail on a regular basis. The problem is that it's such a hassle to insert new quotas since I have to fiddle around with the code. A central "control panel" with an overview and ability to insert new quotas would be more suitable. Is there any software that can do the following: Scan specified folder/subfolders Report the file size and present it in some sort of interface (could be a php/mysql solution) Ability to specify a quota and see the difference value ? It is really important that the quota handling is made simple so that some non-technician can handle this.

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• What's the meaning of logging in as "[email protected]:something"

  - by Harvey Kwok

  My Windows 2008 R2 machine is joined to a domain. In the logon screen, if I type in "[email protected]:something" as the username, I can still logon properly, what's the meaning of ":something" appended at the end? I can even see the current user is displayed as "[email protected]:something" in the switch user screen. Is it a feature in Windows? Or is it just a bug? If it is a feature, what's the difference between logging in as "[email protected]" and logging in as "[email protected]:something"? Note that I tried different combinations like "mydomain\username:something" and "mydomain.com:something\username". None of them work except "[email protected]:something".

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• Unable to boot fedora 11

  - by csunwold

  I have been running fedora 11 for several months without a hiccup, but two days ago I ran "yum update" and installed whatever updates were available (I didn't pay attention to what they were). I was having problems with mysql so I tried "yum remove mysql" and then it removed mysql as well as quite a few unexpected dependencies. I then "yum install mysql" without a hitch and went about my way. However, when I next booted up my machine it got to "Starting preload dameon [OK]" and then it hangs with a flashing cursor on the screen. I tried following http://dailypackage.fedorabook.com/i...ling-Grub.html but it didn't seem to make any difference. I put a new hard drive with WinXP on it into the same machine that I booted to, and I tried to use Ext2 Installable File System for Windows but when I run it, it only seems to see /boot and nothing else on the hard drive. Any ideas?

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