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  • When To Use this.method()?

    - by Soo
    Hi SO, and happy Friday I have a question regarding the use of this.method();. My code seems to work without using the this., but I include it because it seems like the right thing to do. When should .this be used, and because it's presence doesn't always make a difference, what's the best practice for .this?

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  • else or return?

    - by Ram
    Which one out of following two is best wrt to performance and standard practice. How does .NET internally handles these two code snippets? Code1 If(result) { process1(); } else { process2(); } Or Code 2 If(result) { process1(); return; } process2();

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  • 3Ware 9650SE RAID-6, two degraded drives, one ECC, rebuild stuck

    - by cswingle
    This morning I came in the office to discover that two of the drives on a RAID-6, 3ware 9650SE controller were marked as degraded and it was rebuilding the array. After getting to about 4%, it got ECC errors on a third drive (this may have happened when I attempted to access the filesystem on this RAID and got I/O errors from the controller). Now I'm in this state: > /c2/u1 show Unit UnitType Status %RCmpl %V/I/M Port Stripe Size(GB) ------------------------------------------------------------------------ u1 RAID-6 REBUILDING 4%(A) - - 64K 7450.5 u1-0 DISK OK - - p5 - 931.312 u1-1 DISK OK - - p2 - 931.312 u1-2 DISK OK - - p1 - 931.312 u1-3 DISK OK - - p4 - 931.312 u1-4 DISK OK - - p11 - 931.312 u1-5 DISK DEGRADED - - p6 - 931.312 u1-6 DISK OK - - p7 - 931.312 u1-7 DISK DEGRADED - - p3 - 931.312 u1-8 DISK WARNING - - p9 - 931.312 u1-9 DISK OK - - p10 - 931.312 u1/v0 Volume - - - - - 7450.5 Examining the SMART data on the three drives in question, the two that are DEGRADED are in good shape (PASSED without any Current_Pending_Sector or Offline_Uncorrectable errors), but the drive listed as WARNING has 24 uncorrectable sectors. And, the "rebuild" has been stuck at 4% for ten hours now. So: How do I get it to start actually rebuilding? This particular controller doesn't appear to support /c2/u1 resume rebuild, and the only rebuild command that appears to be an option is one that wants to know what disk to add (/c2/u1 start rebuild disk=<p:-p...> [ignoreECC] according to the help). I have two hot spares in the server, and I'm happy to engage them, but I don't understand what it would do with that information in the current state it's in. Can I pull out the drive that is demonstrably failing (the WARNING drive), when I have two DEGRADED drives in a RAID-6? It seems to me that the best scenario would be for me to pull the WARNING drive and tell it to use one of my hot spares in the rebuild. But won't I kill the thing by pulling a "good" drive in a RAID-6 with two DEGRADED drives? Finally, I've seen reference in other posts to a bad bug in this controller that causes good drives to be marked as bad and that upgrading the firmware may help. Is flashing the firmware a risky operation given the situation? Is it likely to help or hurt wrt the rebuilding-but-stuck-at-4% RAID? Am I experiencing this bug in action? Advice outside the spiritual would be much appreciated. Thanks.

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  • Microsoft Office documents collaboration - Open Source alternative

    - by Saggi Malachi
    I am looking for a good solution to collaborate on Microsoft Office documents, we currently just edit directly on a Samba share but it's one big mess because sometimes people leave the office with their laptops while docs are open so swap files remain there and then you nobody is sure what's going on. Is there any good and simple open source solution based on Linux? I've tried Alfresco but it is much more than what I need, we got an internal wiki for most collaboration and I just need some solution for the stuff we need to do in Microsoft Office (mostly Excel files, the rest is in the wiki) EDIT: Some more info as requested - we are very small group, 4 full time employees and a few freelancers. The best idea I've got so far is just managing it in a subversion repository with a Lock-Modify-Lock policy but I'd love to hear about better solutions. Thanks!

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  • Intel® Core™2 Duo Desktop Processor vs Intel® Core™ i3 Desktop Processor?

    - by metal gear solid
    Intel® Core™2 Duo Desktop Processor vs Intel® Core™ i3 Desktop Processor? Which CPU is better to buy ? Intel® Core™ i3-530 Processor (4M Cache, 2.93 GHz) (it supports DDR3 also) or Intel® Core™2 Duo Processor E7500 (3M Cache, 2.93 GHz, 1066 MHz FSB) (it supports DDR2 only ) Although I do not play games on my PC but I need good performance in Adobe Photoshop, Watching Full HD Movies. I need good performance in Multitasking. Along with any of these CPU I would purchase 2 GB x 2 stick of RAM. and I will use Windows 7. and I will use Microsoft VPC images also with MS Virtual PC.

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  • Does this laptop have high enough specifications for gaming? [closed]

    - by Grant
    Here's the laptop It wouldn't be hardcore gaming, mostly things like the new Deus Ex game, Mirror's Edge, Portal 2, etc... I need to replace my current, broken, laptop and I thought this would be a good opportunity to get to play some of these games. My current laptop is really only lacking in its graphics card. (Intel series 4 chipset) If this laptop isn't good enough, I would really appreciate suggestions. I won't be able to get a desktop, otherwise I would, and I can't spend more than $1000 dollars on my new laptop.

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  • Should I be afraid of Linux server administration?

    - by markle976
    I've been trying to figure out what to focus on. I finally realized that the root of my quandary is that I am unsure about learning Linux server administration. I have been getting pretty good with PHP/MySQL and web development, but I am not very familiar with Linux. Is it hard to learn? What would I need to know in order to manage a LAMP stack? Also, which version is most used in enterprises? I think I have also hesitated to dive in because it seems like it is mostly used in small companies, but I guess that could be a good thing.

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  • JMeter Stress testing

    - by mcondiff
    MAMP server hosting a Joomla instance. I'd like to hear the community's thoughts on the best way to stress test the server and find it's breaking point on concurrent users etc. Currently I have setup a test plan which I have going to the home page, grabbing the index.php, css, js and all images and have run tests on 1 to 100 users and a varying number of loops. What I'd like to know is how do I determine at what number of concurrent requests or looping requests is a good way to gauge if my server can handle the proposed increase in traffic? What is a good KB/sec, Throughput, Average, Max, Min via the Aggregate Report and at what number of threads/loops etc? I have googled and have not found immediate answers to these questions and thought to come here. More or less I have just used this http://jakarta.apache.org/jmeter/usermanual/jmeter_proxy_step_by_step.pdf to guide me and then I have been winging it in terms of Thread and Loop numbers. Any light shed on these subject would be much appreciated.

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  • SSD for Visual studio : Intel X25-m G2 or OCZ Vertex

    - by meska
    hi, looking for laptop upgrade, and thinking about SSD drive. Laptop would be Dell Studio XPS with T9400 as i can get one for a very good price. So i was thinking about replacing the built in 500 GB hdd with some kind of SDD Currently two choices: OCZ Vertex Series 60 GB vs. Intel X25-M G2 MLC 80 GB Price is almost the same. From anandtech Intel performs badly in sequential write, but scores very high numbers in random write and random read (good for visual studio?) and i get more space. What do you think? OCZ Vertex or Intel X25-M G2 ? Purely from Visual Studio 2008 and upcoming 2010 perspective?

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  • Feedback request: Linode for Magento hosting?

    - by Ernest
    Hello, i install and customize a self made application for web pages which uses spring+jstl and the admin uses flex. Also i want to add to my offers an ecommerce cms, so i have decided to start with magento. I'm using daily razor vps, however i was thinking in switching to linode because of the price. My questions are: 1.- Is linode good for magento ? 2.- is linode good for java+tomcat+jstl+mysql apps ? 3.- What are the most demanding resources to magento ? CPU ? RAM ? Does it consumes more if i have more products? Well i hope to learn from you, this page is always so helpful UPDATE: A final question: 4.- Do you recomend another vps service for my requieriments ?

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  • Exchange Transport Service Started but not working

    - by Philippe
    Good day, Here is the problem : We are hosting a Microsoft Exchange Server. Everything working fine until recently, where the mail transport seems to go wrong. We almost have to restart the service every morning. The thing is that the transport service is started, but the mail are not delivered to the users and senders to our server get a delayed delivery notification. When we restart the service, all the mail is then delivered to the users and we're good to go for a day or two. Things I've noticed : The store service is growing to around 6 Gb of used RAM, and the w3wp.exe service is hanging around 700mb RAM. Is there a way to schedule a restart of the transport role every 4 hours or something while I'm solving the issue so I don't have to worry when I leave for the week-end? And most of all...does anyone have any idea on how to solve this issue? Thanks, Philippe

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  • NetApp and SQL Server?

    - by Edinor
    Do you have any good or bad experiences to share running SQL Server OLTP Systems on NetApp appliances? I have been working with a small, relatively low-volume cluster with a lower-end NetApp device, and I have found the environment to be generally unstable, at least compared to my experiences with other SANs, iSCSI arrays, and DAS setups. I struggle to believe that RAID DP and WAFL are more than fairy-dust technologies. A solution has been proposed to me that I just need a bigger, better NetApp, with PAM cards and other cool technology I've not heard of, and I feel like I would be better off spending a quarter of that on good direct-attached drives and a beefy server. At the same time, I feel that an Enterprise-class SAN should be something I can count on to be consistently a more stable, better performer than the less expensive solution I might propose. Are you a SQL Server DBA in an OLTP environment and love your NetApp? If you don't like them, why not?

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  • Wireless Bridge with NetGear and TP-Link

    - by Tiago Cruz
    I have a wireless NetGear WGR614 v7 (little old) router connected to the internet, but I can't get a good signal in the other end of my house. I have another new one, model TP-Link TL-WR941ND wireless router. I was able to do the stuff works using a wired cable, but now, I would like to do the same using wireless connections (bridge mode, some like WDS?) Now, the computer connected to TP LINK was able to ping my computer connected to NETGEAR, but we cannot go IP ADDRESS outside my network, only internals ones. What can I do to configure this? Is needed that BOTH wireless routers support BRIDGE mode or only one its good enough? Thanks a lot!!

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  • Dvorak hotkey remapping in vim, worth it?

    - by Bryan Ward
    I've been trying to learn the dvorak keyboard layout of late and I have been making some good progress this time around. The trouble I am finding now is that all of my hotkeys are all in the wrong places. As a vim user this is particularly troubling. I have found good resources to switch the bindings back so that they are in the places in vim, but I wonder if this is worth it. I also use set -o vi in my ~/.zshrc file so that I can use the familiar bindings in the terminal as well. hjkl navigation is also featured in a number of other applications such as less. For those of you out there who have successfully made the switch, is it worth remapping things to be familiar again, or is it better in the long run to just deal with weirdly placed hotkeys?

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  • MD3200 - 3 to 4x less throughput than MD1220. Am I missing something here?

    - by Igor Polishchuk
    I have two R710 servers with similar configuration. One in my office has MD1220 attached. Another one in the datacenter of my hosting services vendor has MD3200. I'm getting significantly worse throughput from MD3200 at my vendors setup. I'm mostly interested in sequential writes, and I'm getting these results in bonnie++ and dd tests: Seq. writes on MD1220 in my office: 1.1 GB/s - bonnie++, 1.3GB/s - dd Seq. writes on MD3200 at my vendor's: 240MB/s - bonnie++, 310MB/s - dd Unfortunately, I could not test the exactly the same configurations, but the two I have should be comparable. If anything, my good performing environment is cheaper than the bad performing. I expect at least similar throughput from these two setups. My vendor cannot really help me. Hopefully, somebody more familiar with the DAS performance can look at it and tell if I'm missing something here and my expectations are too high. To summarize, the question here is it reasonable to expect about 100MB/s of sequential write throughput per each couple of drives in RAID10 on MD3200? Is there any trick to enable such performance in MD3200 with dual controller as opposed to simple MD1220 with a single H800 adapter? More details about the configurations: A good one in my office: Dell R710 2CPU X5650 @ 2.67GHz 12 cores 96GB DDR3, OS: RHEL 5.5, kernel 2.6.18-194.26.1.el5 x86_64 20x300GB 2.5" SAS 10K in a single RAID10 1MB chunk size on MD1220 + Dell H800 I/O controller with 1GB cache in the host Not so good one at my vendor's: Dell R710 2CPU L5520 @ 2.27GHz 8 cores 144GB DDR3, OS: RHEL 5.5, kernel 2.6.18-194.11.4.el5 x86_64 20x146GB 2.5" SAS 15K in a single RAID10 512KB chunk size, Dell MD3200, 2 I/O controllers in array with 1GB cache each Additional information. I've also ran the same tests on the same vendor's host, but the storage was: two raids of 14x146GB 15K RPM drives RAID 10, striped together on the OS level on MD3000+MD1000. The performance was about 25% worse than on MD3200 despite having more drives. When I ran similar tests on the internal storage of my vendor's host (2x146GB 15K RPM drives RAID1, Perc 6i) I've got about 128MB/s seq. writes. Just two internal drives gave me about a half of 20 drives' throughput on MD3200. The random I/O performance of the MD3200 setup is ok, it gives me at least 1300 IOPS. I'm mostly have problems with sequentioal I/O throughput. Thank you for looking into it. Regards Igor

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  • Which linux distro for a laptop in windows environmet?

    - by Dev er dev
    I just got new laptop at work. What would you recommend as a linux distribution for it? All other developers are working under windows, and use windows tools. I'm currently using ArchLinux, but want to change it. I don't want to waste time configuring wireless, windows network shares, network pritners, projector, etc ... I want this stuff to just work, while still having sane and stable development evironment and tools. Is Ubuntu a good choice for this? I use gentoo at home, but don't think it is a good match for work environmet. EDIT: Note that we are working on cross platform apps, and deployment platform is almost always linux. There are very few windows apps that I have to use (like MS Project). It is just that everything else is windows centric. I use linux because I feel more productive with it, even if I have to dual boot to edit MS Project files.

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  • How to securely generate memorable passwords?

    - by Tim
    Whenever I need new passwords I use some tools to generate those, preferable memorable passwords, but I've been wondering how secure this might actually be. Using The xkcd random number generator is probably pretty bad, cat /dev/random is probably pretty good, but generating memorable passwords seems a bit more tricky. Whenever a program generates a memorable password, it only uses a subset of the total password space available, and it is not clear to me how big this space is. Of course a long password should help in this case, but if the `memorable' part of the program is too predictable, your passwords are not very good in the end. TL;DR: how secure are memorable password generators, given the fact that `memorable' passwords are a subset of total password space? Some tools I know of: pwgen -- seems ok, but passwords are not too memorable Mac Password Assistant - generates memorable passwords but it is unclear to me how this works.

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  • Dedicated NIC or dedicated port for iSCSI?

    - by Newt
    When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That makes a lot of sense and I have no problem with it. The question I do have, is this - should that suggestion be taken to mean that a separate physical NIC should be used, or will a dedicated port/ports on a dual/quad port NIC be just as good? My suspicion is that simply using dedicated port(s) on a shared NIC would be just as good. Any input greatly appreciated.

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  • CORAID using only 1 of the 2 available NICs for AoE traffic

    - by Peter Carrero
    We got 6 CORAID shelves in my workplace. On 2 of them I see AoE traffic on only 1 of the 2 NICs that are attached to the SAN switch. We got jumbo frames enabled on all devices. Both NICs show up when I issue the aoe-interfaces command. This wouldn't bother me too much if the throughput performance observed on the "bad" shelves using bonnie++ wasn't half of the result of the "good" shelves. The "good" shelves are older SR1521 model and they have ReiserFS on their LUNS - not that I think it makes a difference - and the "bad" shelves are newer SR2421 model and have JFS. Any help as to what is going on and how to rectify this would be greatly appreciated. BTW: even the lower performing shelves outperform another iSCSI device we got, but that is another story... Thanks.

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  • What is your best travel (portable) WiFi router?

    - by Sorin Sbarnea
    I'm looking for a small WiFi router that I could use to create my own wireless network when I travel. I'm also interested in a router that has very good signal/antenna and that is easy to take with you. Please do not recommend products just because you can find them on the net, I'm interested about personal experience. Also it's good to know if you can install open-source firmware on it. Selection criteria: size signal quality price Required: to support both 110V/220V power supply, best if embedded or retractable cord.

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  • my Website loss packet in 70% countries, how can i dertermine why its loss packets?

    - by user2511667
    I checked my website on google page speed tester, it show result 90/100. I checked my website on pingdom it shows good result there. When i check my website in cloudmonitor.ca.com, it shows good result in 30% countries and all other countries it show packet loss (100%) How we can determine why my website has packet loss? And what is its solution? Is this problem from my server or from my website? I created new html blank page and set it too my index page, after I tested, it still shows packet loss, guess this means the problem is not in my website. Here is live result When I visit my website in browser, website is working fine. But when i test my domain or IP 198.178.123.219 in command Prompt it shows "Request time out" Why time out in command prompt?

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  • Tools to test multicast routing

    - by Zoredache
    I am looking for a good simple tool that runs on a standard OS (Windows or Linux) that I can used to test that multicast is being passed properly by a router. I have been asked by a client to enable multicast routing on a Linux box acting as their router since their phone system requires multicast to for a few features. Since I am not physically near the client I don't really have the ability to experiment with the various methods for setting up multicast routing on Linux. I can setup a router at my desk that is identical to what is deployed on their network, but I don't know of any good simple tools that I can use to generate or listen for multicast traffic. The one mulicast tool I have found is mcast.exe tool which is part of the Windows 2000/2003 resource kit. From what I have read online it seems that mcast.exe does not work across a router, and only works on the local network, so that doesn't seem to be useful for me to test multicast routing. So what do tool(s) do you use to test that multicast routing is properly setup?

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