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• Network / Internet diagnostic tool to locate an error?

  - by Jesper

  Hi, I’m facing some difficulties with the Internet / network at my work and I have trouble locating the precise error and when and how it occurs. The problem is that the client machines in the house sporadic is disconnected to the Internet. I’m some what new so I haven’t that much inside in the network and apparently neither has my predecessor. What I am requesting and hoping you guys knows about is, if there exist some kind of network monitor tool I can install and run and it will periodically check the network, the Internet connection etc. and record to logs. Then, if there suddenly arises a problem some time of the day in some part of the network or the Internet connection, I can check it perhaps the next day. I’ve just downloaded and installed Microsoft Network Monitor 3.3 application and hopeful it can give me some answers on where the instability is located but I still would like a tool to make different checks and test in some time interval. Do anyone know about such a program or another kind of performance / diagnostic tool / method I can use? Sincere Jesper

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• Xeon X5550 vs Six-core Opteron for database server

  - by gregmac

  I'm specing out a database server, and the price works out to be reasonably close between an Intel X5550 Quad-core and an AMD 2425HE (2.1Ghz) Six-core Opteron. I've been looking for some comparisons between the two, but the only thing useful I've found is an AnandTech Review of the 2435 which compares it to Intel Xeons, but concludes they both have their place. My load is MS SQL Server 2008, with an OLTP database that has about an equal amount of reading/writing (and it's a reasonably heavy load). So my question is, what is going to work better in this situation, assuming the drives are the same: Xeon X5550, with 16GB 1333Mhz RAM (Dell R510) or an Opteron 2425HE (2.1Ghz) or 2439SE (2.8Ghz) with 16GB of 800Mhz RAM? (Dell 2970) Note: the 2439 adds $500, but the overall pricing works out that it's not that much more than the R510. Using the 2425HE, the Dell 2970 server is slightly less than the similarly-equipped R510). If it adds a decent amount of performance, it's worthwhile to go faster. (single CPU, in both cases).

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• best practices for setting development environment

  - by Sharique

  I use Linux as primary OS. I need some suggestions regarding how should I set up my desktop and development. I do work on mostly .Net and Drupal, but some time on other lamp products and C/C++, Qt. I'm also interested in mobile (android..) and embedded development. Currently I install everything on my main OS, even I use it a little. I use VMs a little. Should I use separate VM for each kind of development (like one for .Net/Mono, another C++, one for mobile and one for db only, one for xyz things etc) Keep primary development environment on main os and moveothers in VM. main os should be messed up keep things easy to organize (must) performance should be optimal

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• BES 5.0 and MAPI calls to exchange system

  - by nysingh

  We have been using BES 4.1(5) for a while now and it has been a resource hog on exchange due to high number of MAPI calls. I have heard that BES 5.0 is even worse. the comparison i heard is that BES 4.1 is makes MAPI calls equal to 5 outlook clients per BB user and BES 5.0 makes MAPI calls equal to 10 outlook clients per BB user. can someone confirm if it is true? is BES 5.0 is really that bad in MAPI calls and for exchange performance. ? thanks

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• MS SQL Server and "No Hard Drive Space Left"

  - by bobber205

  Got a server running a document delivery system on it. The machine is running extremely poorly (Windows XP). I've checked the regular things, like doing a memtest (turned out fine) and trying to degraf the HDD (not needed). The only thing weird about this machine is that its running MSSQL server. And Symantec Anitvirus. (ugh) Sometimes the machine reports "No hard drive space left". I immediately look at the one hard drive at the machine and it still has 20 gigs left. Each and every time. Could MSSQL server cause this? Could this be tied to the machine's terrible performance? Thanks!

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• VMware networking - PortChannel or not?

  - by dunxd

  My ESX hosts each have 8 NICS. I have set up 2 NICs for our iSCSI SAN - each is connected to a different SAN switch. 2 NICs are set up for vMotion and Service Console - these are each connected to a different core switch (ports are trunked with VLANs dedicated to vMotion and Management) I now have four ports left over. Currently we have these set up each going into our default VLAN. Two NICs are connected to one core-switch and two are connected to the other. We decided to aggregate the connections to each switch - so they are teamed at the vswitch end, and port channelled at the physical switch end. I am now reading that port channelling these connections is not particularly useful, perhaps even over complicating things. Is there a particular problem with using port channels for VMware? What method provides the best balance between redundancy and performance?

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• Install both 64-bit and 32-bit JDK on a 64-bit windows?

  - by Toperi

  I need to use a java library that uses native code requiring a 32-bit jvm. I have 64-bit windows with 64-bit eclipse installed with 64-bit JDK7. In order to develop with it, do I need to have 32-bit JDK? Or would the JRE suffice? If it is possible to install both, what is the naming convention you use for the installation directory for the 32-bit jre or jdk? I have heard rumors there is a performance hit on virtual memory if both are installed, is this true?

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• Connect two subnets without router

  - by Shcheklein

  I got two Comcast routers with two different subnets on each. Every subnet contains 5 static IPs. Two questions: Are there any problems if both routers and machines from both subnets are connected into one switch? Security issues doesn't matter there. I need to know if there are some performance or other problems. Is it possible to make machines from different subnets to see each other if they all are connected into one switch? Some static routing, add ARP records or somethig else ... I just want to avoid configuring second ethernet adaptors, third router or something. And I need to connect these subnets vai high-speed local network.

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• How to unmount a VHD in Windows 7. There is no unmount option.

  - by Triynko

  I mounted a VHD file in Windows 7 using the Disk Manager. Once mounted, there is no option to Unmount it. The only thing close to such an option that I can find is if I click the icon in the taskbar notification area that I use to remove USB devices... there's an option to eject the virtual hard disk. However, when I click that, it says that it's in use and cannot be ejected. Even though... it's not in use, I never even browsed the drive. The disk manager is closed... and the only open files handles to the drive (according to disk performance in task manager) is SYSTEM. Ejecting devices cleanly has been a problem since Windows XP, and it sickens me to see it persist into windows 7.

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• Dual boot OSX and Windows 7 natively

  - by Phill

  I'm considering getting one of those new fancy Mac Book Pro's with the fancy screens, but after reading some stuff on the internets about running Windows 7 with bootcamp: https://discussions.apple.com/thread/2770866?start=0&tstart=0 It seems you can't use the integrated graphics with windows, this causes windows to chew the battery life: I am afraid it is not possible. Since Apple introduced dual graphics chip laptops, they kept the low power/embedded GPU hidden under Window and they expose only the power hungry discrete GPU. It feels that this is being done on purpose so that it appears to users that OS X offers a better experience and battery life over Windows. So running bootcamp and windows kills the battery, running in parallels means you don't get accelerated 3d support (or something along those lines), so you don't get the performance out of it. I'm wondering: Is it possible to natively dual boot Windows 7 on a MBP, and if so would/does that give windows access to the integrated graphics to be able to not rape the battery?

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• Does the ``-'' sign have meaning in rsyslog.conf

  - by Aleksandr Levchuk

  Rsyslog is backwards-compatible with Syslog configuration files. The syslog.conf man page has: You may prefix each entry with the minus ``-'' sign to omit syncing the file after every logging. Note that you might lose information if the system crashes right behind a write attempt. Nevertheless this might give you back some performance, especially if you run programs that use logging in a very verbose manner. but I could not find aything about the - sign in man rsyslog.conf. What does rsyslog do when if reads - in the config file?

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• Classic ASP on large memory server

  - by Steve Evans

  I have a client with a large ASP app that apparently is fairly memory intensive. I’m helping them migrate to new hardware they have running Win2k8 R2. They have 4 physical servers with 32gb of RAM each. I’m making the assumption that ASP apps run as a x32 process. So I see that we have two options: On the application pool enable web gardens. Use the physical servers as VM hosts and split the box into say 4 web servers each. Any thoughts on which path will provide us better performance? I’m just not really sure how ASP will handle a machine with lots of memory, and I’m worried it won’t really be able to address the memory well. (you can ignore all the obvious stuff like increased maintenance of 16 web servers vs 4, or the flexibility virtualization gets us over physical servers, etc)

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• Instant database snapshot

  - by raj

  My product uses oracle 9 database in its backend. every week the new release of the product is launched which will want to fire some DML, DDL queries to the database. I usually test the product release in a dummy database before applying it in the main database. I create a database dump using exp command, then import them into dummy database using imp. then i test the product in the dummy database and checks if there are any errors. This exp and imp takes about 3 hours to complete. Is there any alternative as : instant snapshot of the live database (which will be independent of the live one)? or is there any option to keep dummydatabase in sync with the originl database always. Yhis can be done by making the product firing DML&DDL queries to both the databases.. but this will be a HUGE performance problem.. how can i overcome this?

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• Satellite TV on my PC?

  - by jasondavis

  What would be a good solution for hooking up the satellite TV box (Dish network) in my room to be able to watch it on my PC and possibly record video from it? Please share with me the best cards, cables, software, anything else needed to do this in the most efficient way? I am looking at the WinTV-HVR from Hauppauge. I am not sure, for performance, what would be the best to go with, PCI, PCI express, USB2.0? Also on the Hauppauge website I saw this note: "WinTV-PVR products will not work in PC systems with 4GB or more of memory." The new PC I am building will be 12-24gb of DDR3 RAM, does that mean their products will not work at all with my memory? So confused now!

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• Advise on VMWare hardware requirements and host OS

  - by edwin.nathaniel

  Hi All, I'm a newbie developer wanting to learn a bit about Virtualization (from the IT point of view, not theoretical/academic). What I'd like to do: Prepare a machine Install VMWare or VirtualBox Prepare 3 Guest OSes (one for Win2k8 server, 2 for Ubuntu Server) Win2k8 will run SQL Server 2k8 and IIS (for ASP.NET MVC deployment) 1 Ubuntu Server for Drupal, SugarCRM, MediaWiki, typical LAMP stuff 1 Ubuntu Server for Java (Tomcat/Jetty + MySQL/PostgreSQL) What I'd like to know: What would be the ideal Host OS such that the Host OS should not spend too many resources on itself but should boost these instances of VMs (e.g: does Win2k8 performs better vs Linux?) What would be the ideal machine for this (preferably AMD base chip) I'm not expecting the best performance out of this setup, just a decent one to host one drupal instance, one ASP.NET MVC (future, not now), and one Tomcat/Jetty instance. NB: If you have a better suggestions on the setup, feel free to let me know (e.g: maybe Drupal and Tomcat can be in one instance but move the database to another instance instead of 1 instance map to 1 webserver and 1 dbserver). Thank you.

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• Software RAID 10 on Linux

  - by vpetersson

  For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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• Advantage of using nexenta vs. OpenSolaris

  - by jotango

  I am currently building a NAS for about 24 TB of storage. Video files, slow access, long term storage. No performance issues. I am currently undecided between buying a JBOD case and installing OpenSolaris (because of ZFS), or purchasing a Nexenta license. The difference is about $ 12.500 for licenses over three years. What would you see as the main advantage in purchasing a nexenta license, beside the support? Did nexenta really enhance the basic OpenSolaris, or is it just a lot of marketing speak? No one really wanted to answer that question.

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• Return http status ok (200) on request method OPTIONS Apache

  - by jazz

  I have a apache server which uses Reverse Proxy to connect/direct to a tomcat server. Using virtualHost, RequestHeader set X-Forwarded-Proto "http" ServerName image.abc.local DocumentRoot "/var/www/html" ProxyRequests Off ProxyTimeout 600 ProxyPass /abc http://image.abc.local:9001/abc ProxyPass /xyz http://image.abc.local:9001/xyz ProxyPassReverse /abc http://image.abc.local:9001/abc ProxyPassReverse /xyz http://image.abc.local:9001/xyz what i want to achieve here is that, when there is a REQUEST_METHOD OPTIONS i want simply return HTTP status OK (200). I dont want the request to be received by the tomcat server and process it. For performance based concerns i want this request to be handled at apache level. with all the research i was still unable to get this to run; RewriteEngine on RewriteCond %{REQUEST_METHOD} OPTIONS RewriteRule .* - [R=200m] can somebody assist me with what rewrite rule should be there? or is there an alternative to RewriteEngine? Thanks

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• Windows Upgrade vs Full Install

  - by James Atkinson

  I'm in the process of purchasing a Netbook for use while traveling. The included OS is XP, however, I would like to upgrade(?) to Windows 7. My question: Does a Windows Upgrade have the same physical footprint and performance as a full install? Does an upgrade leave behind non used files/resources that were originally included in XP? If so, are there ways to reduce this? I'm trying to reduce as much OS bloat as possible. Please let me know if my question is unclear. Thanks. Related to http://superuser.com/questions/60646/is-a-clean-install-really-better-than-an-upgrade however, this doesn't address the "leftovers" question.

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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• How can I use a batch shortcut to open multiple Windows Explorer folders, and a Notepad file?

  - by ModelHX

  I've recently built a computer with an SSD in it (my first) and am in the process of moving a select few of my Steam games to the SSD and symbolically linking them to where they're supposed to be on the main (mechanical) hard drive so that Steam doesn't throw a fit and I get maximum performance. To this end, I'm finding myself repeatedly navigating to both target folders to move the relevant files and opening a specific Notepad file to enter the relevant paths into a template I've got set up that I paste into the Windows command prompt to create the symlink. This is annoying. I've read up a little bit on batch shortcuts, and have a basic understanding on how to use one to open programs and files. However, I'm finding a lot of confusing suggestions on how to use batch shortcuts to open specific folders in Windows Explorer, and none of them deal with opening multiple folders at once. Any assistance on writing the shortcut would be greatly appreciated. Thank you for your time.

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• Choosing between cloud (Cloudfoundry ) and virtual servers - for developers

  - by Mike Z

  I just came across some articles on how to setup your own cloud using Cloudfoundry and Ubuntu, this got me thinking, choosing our infrastructure, if we want to use our own servers what's the advantage of cloud on virtual servers vs just using virtual servers, VPN? If we now develop for the cloud later if we need help we can quickly move on to a cloud provider, but other than that what's the advantage and disadvantage of private cloud in these areas? speed of development, testing, deployment server management security having an extra layer (cloud) will that have a hit on server performance, how big? any other advantage/disadvantage?

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• Cisco FC SAN switch decision

  - by Chopper3

  I've got to buy a bunch of FC SAN switches in the next week or so, I have to, and want to, buy Cisco MDSs. Servers are HP BL490c G6's in C7000 chassis with Virtual-Connect Flex-10 ethernet interconnects and VC FC interconnects (Emulex HBAs btw), all running ESX 3.5U4 (for now). I think I've only really got two choices; MDS 9509's with dual-supervisors with a single 48-port 4Gb FC card MDS 9222i's with single supervisor and the built-in 18-FC-port/4-GigE-FCIP-port option Both have the same functionality (I think, buying the enterprise licence btw), both have plenty enough performance and adequate ports for now and the next three years. The 9222i's are about 55% the price of the 9509's - logic says get the 'i's but will I really miss the dual-supervisors? I've got lots of 9509's with dual-supervisors that I'm very happy with but I'm not sure I've every benefitted from the dual-sups in the past and they are nearly twice the price - but if I don't buy them and miss them I can't retrofit them later. What are your thoughts?

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