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• Wireless range extender throughput extremely slow.

  - by Alan B

  I've got a Belkin 54G router connected to the internet, and a Belkin range extender model F5D7132. I can get the range extender connected to the parent router SSID no problem, in repeater mode as opposed to access point mode. My Windows 7 laptop connects to the extender, which has a different SSID, and it connects with the full 5 bars. The issue is that when going through the extender internet performance is murderously slow, even getting the config pages of the extender or router is bad. When I connect directly to the router, all is well.

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• How (much) is virtualization used today?

  - by BLAKE

  I know that where I have worked, I have pushed alot for virtualizing our servers. I think that it is much easier to implement and maintain than physical servers. I have been using Microsoft's Virtual Server 2005 R2 since it was released. Right now at my workplace we have 12 VMHosts that hold about 55 VMs. We have 6 other servers that we have been unable to convert to VMs. I want to know how other people in our field view virtualization. I know that I have had developers dislike the notion of VMs claiming major performance hits. What do other Sys Admins think about virtualized servers?

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• Sudden slow read & write speed on all IO

  - by user23392

  I have a custom built rig that has 2 storage drives. for OS: Western Digital 1.0TB HARD DR 64MB for other stuff: Corsair Performance 3 128GB (SSD) [ expected read speed: 400 mb/s ] The system was incredibly fast for a couple of months, then one day i was playing a game then it started to get buggy (some sounds and objects disappearing), i stopped the game and the system seemed to be unstable so i had to shut it down, next morning i couldn't start it up, it was saying something about corrupt device. I formatted both disks and installed a fresh copy of windows, all i can say that since that day the system was never like before, it takes 10 minutes to boot up (the icons and desktop slowly appear). but once it's done the slowness isn't as noticeable. Here's my benchmark on the HDD ( read speed - write speed ): And the SSD: Anyone knows what could be the issue?

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• How is it possible for SSD's drives to have such a good latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives have such a low latency, whereas they are using NAND chips? (or at least lot better than what a typical single NAND chip would do) EDIT: I think under-estimate NAND chip capabilities. USB drives, while powered by NAND's are mostly limited by USB protocol (which have a pretty high latency) and the USB controller. That explain their poor performance in some cases.

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• Fresh install of Xenserver 6.2 , cannot load tools in Guest Win7

  - by Erik

  I've just started testing the XenServer 6.2 offering.. it's awesome so far.. I've event loaded all the patches and hot fixes, and started a windows 7 guest image. I want to install tools, but whenever I click the install tools boxes.. I'm taken to my VM console and nothing loads. It's a brand new guest, and most of the advice is for those with previous versions of tools loaded. Any ideas how to fix this?

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• Virtualbox, merging snapshots and base disk

  - by Henrik

  Hi, I have a virtual machine with about 30 snapshots in branches. The current development path is 22 snapshots plus the base disk. The amount of files is seemingly having an impact now on IO and the dev laptop I'm using (don't know if it is host disk performance issues with the 140GB total size over a lot of fragments, or just the fact that it is hitting sectors distributed across a lot of files). I would like to merge the current development branch of snapshots together with the base disk, but I am unsure if the following command would produce the correct outcome. I am not able to boot this disk after the procedure completes (5-6 hours). vboxmanage clonehd "C:\VPC-Storage\.VirtualBox\Machines\CRM\Snapshots\{245b27ac-e658-470a-b978-8e62137c33b1}.vhd" "E:\crm-20100624.vhd" --format VHD --type normal Could anyone confirm if this is the correct approach or not?

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• Redirect traffic to local address so iOS speedtest app measures LAN speed

  - by ivan_sig

  I have mounted a Speedtest Mini server on a local LAMP, so I can test my LAN speeds effortlessly just by opening the URL with a Flash enabled web browser, the thing is, I want my iOS and Android devices to test with the LAN server too, not with the WAN, as I'm trying to measure LAN-Only performance. Is there a way so I can redirect the traffic intended to an specific external IP (The one of the real server) to my local server?. I know the servers IP as a short Wireshark analysis gave me the data, but still searching for a way to make that redirect. I have Jailbreak and root on my devices, so playing with system files is not a problem. I've tried mounting a proxy and making redirects by the hosts file and domain names, but it looks like Ookla's app relies on IP address only.

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• SSD runs faster on Windows as compared to Linux [closed]

  - by wushugene

  Windows 7 seems to install, boot and run much smoother & faster than each the three linux distros I have recently tried (Ubuntu 12.04 unity, Linux mint 13 MATE, and Fedora 17 on gnome 3.4). Why am I facing bad performance in Linux? I have tweaked my Linux installs for the SSD (enabling trim, disabling swap, etc.) I'm using an Acer TravelMate with i5-2410m processor, intel hd 3000 graphics, 8 gigs of ram, and a 256 gb samsung 830 ssd. Edit: Boot times are 10-15 seconds slower, there is noticeable delay from login to fully loaded desktop, and in general does not appear to be as responsive as my old windows 7 install or the Linux guests I had running on it.

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• Which PSU should one chose? The biggest is the best?

  - by Shiki

  I'm fully aware of PSU's "Active PFC" and that they won't consume the written W all the time. (Makes sense). But now I'm before a PSU replacement (Guys: NEVER buy a Chieftec. Seriously.) The question is: If one can get a bigger one (in my case 750W and 650W) ... should that person go for the bigger one ? (The difference in price is not much). No, I don't think I'll soon use all that much. (Please help (if you want of course) to make the question more generic if the question is really not OK in this form. I've been wondering about this for a time already. In my case it would be XFX Black Edition Silver 750W and 650W) (Basically about "which one" I would go with XFX/Antec/something which comes with industry qualified parts. Like Duracell but in a PSU. :) But the performance is a different thing.)

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• Mitigating the 'firesheep' attack at the network layer?

  - by pobk

  What are the sysadmin's thoughts on mitigating the 'firesheep' attack for servers they manage? Firesheep is a new firefox extension that allows anyone who installs it to sidejack session it can discover. It does it's discovery by sniffing packets on the network and looking for session cookies from known sites. It is relatively easy to write plugins for the extension to listen for cookies from additional sites. From a systems/network perspective, we've discussed the possibility of encrypting the whole site, but this introduces additional load on servers and screws with site-indexing, assets and general performance. One option we've investigated is to use our firewalls to do SSL Offload, but as I mentioned earlier, this would require all of the site to be encrypted. What's the general thoughts on protecting against this attack vector? I've asked a similar question on StackOverflow, however, it would be interesting to see what the systems engineers thought.

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• TCP 30 small packets per second flood connection with server

  - by Denis Ermolin

  I'm testing connection with flash client and cloud server(boost::asio for software) over TCP connection. My connection with server already is really poor - 120 ms ping in average. I found when i start to send packets with 2 bytes size (without tcp header) with speed 30 packets/s - ping grow to 170-200 average. I think that it's really bad and my bad connection and bad cloud provider is reason for this high ping without any load. What do you think? (I tested my software - it can compute about 50k small packets/s so software is not a problem). I measure my ping through flash client - send packet with timestamp and immediatly send from server to client.

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• what to use instead of laptop-mode?

  - by playcat

  hello, i have ubuntu 10.10 64bit on hp 6735s (turion processor). it overheats, and i'm forced to use turion power control in order to keep core temperature to a reasonable level. one more measure that i use is putting my processors to conservative mode. that way, i'm perfectly happy with its performance, and heat is where it should be. however, after my latest upgrade, something happened - cores are back to ondemand by default, and i'm not sure if turionpowercontrol is working any more (ps axu | grep urion shows no process). in addition, i read somewhere that laptop-mode uses hdd spindown for preserving data/energy, and that hdds have only a limited amount of those spindowns, so laptop-mode usage can actually shorten the life of my hdd. i'm wondering if there is a good way to set my cores to automatically go to conservative mode? also, what's the good way to see what is the voltage my cores use? on windows i use cpuz tools. thx and sorry for the long explanation.

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• Restart single uWSGI application (when it's in emperor mode)

  - by Oli

  I'm running uWSGI in emperor mode to host a bunch of Django sites based on their individual configs. These are supposed to update when it detects a change in the config file and this largely works when I just touch uwsgi.ini the relevant file. But occasionally I'll mess something up in the Django site and the server won't load. Yeah, yeah, I should be testing better but that's not really the point. When this happens, uWSGI seems to mark the site as dead and stops trying to run it (seems to make sense). Even after I fix the underlying issue, no amount of touching will get that site's uWSGI process up and running. I have to reload the whole uWSGI server (knocking dozens of sites out at once for a few seconds). Is there a way to force uWSGI to just reload one of its sites?

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• Windows 2008 Server on VMWare (hardware)

  - by Bill

  I want to setup a single server to run a few virtual servers for our datacenter. I do not have a lot of money to spend so I am trying to gain bang for the buck. My budget is around $2,000. So I was thinking about building the following as the VMWare physical server: Intel iCore 7 950 (LGA1366, 4 cores,8 threads) Gigabyte GA-X58-USB3 LGA 1366 X58 ATX Intel Motherboard 24 GB of Viper II Series, Sector 7 Edition, Extreme Performance DDR3-1600 (PC3-12800) CL9 Triple Channel Memory VelociRaptor 300GB 10,000 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive I am planning on running the newest version of VMWare ESXi (64-bit). On these I am planning on running a few various servers: Windows 2008 Server R2 w/ IIS (several custom built ASP.NET Apps) Windows 2008 Server R2 w/ MS SQL 2008 Database Server Linux Web Server w/ Several WordPress Blogs (XAMPP?) Windows 2008 Server R2 w/ IIS (DEV ENVIRONMENT) Windows 2008 Server R2 w/ MS SQL 2008 Database Server (DEV ENVIRONMENT) In your opinion, will this hardware be sufficient to run the above load with room for possible 2-3 more virtual machines (probably lightweight web servers)?

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• In BASH, are wildcard expansions guaranteed to be in order?

  - by ArtB

  Is the expansion of a wildcard in BASH guaranteed to be in alphabetical order? I forced to split a large file into [10Mb pieces][1] so that they can be be accepted by my Mercurial repository. So I was thinking I could use: split -b 10485760 Big.file BigFilePiece. and then in place of: cat BigFile | bigFileProcessor I could do: cat BigFilePiece.* | bigFileProcessor In its place. However, I could not find anywhere that guaranteed that the expansion of the asterisk (aka wildcard, aka '*' ) would always be in alphabetical order so that .aa came before .ab ( as opposed to be timestamp ordering or something like that ). Also, are there any flaws in my plan? How great is the performance cost of cating the file together?

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• SonicWALL NetExtender - Client Install?

  - by JArmani

  We are about to push out a new VPN solution for our organization. One of the beautiful things we saw in SonicWALL's SSL-VPN was the thin, browser-based solution of NetExtender. Does anybody have experience with this? My specific concern is that, at least in Windows 7 during testing, it prompts for admin credentials to install the ActiveX NetExtender plugin, which is standard for installing anything in a Windows domain environment. But doesn't this mean I actually have to go in and install the client on all domain laptops that will be using the VPN in the field? They wouldn't actually be able to simply visit the site and run the client, as advertised? By the way, we're using the SonicWALL NSA 3500 device. We do have ManageEngine's Desktop Central, which can push out software installations, but it usually has to be in the form of a .MSI package. Is there any solution to this, besides hitting up all my organization's computers?

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• WMI Notfication and database mirroring

  - by user22215

  Hi all I'm having a problem configuring a WMI alert that I would like to use with database mirroring. I'm running on Windows 2008 Enterprise X64 with Server 2008 Enterprise X64 also SQL Server has SP1 installed. Basically I click on alert select WMI after that I typed the below SQL statement SELECT * FROM DATABASE_MIRRORING_STATE_CHANGE WHERE DatabaseName = 'testmove' AND State = 8 I have also made sure the service broker is enabled for the msdb and all mirrored databases however I still can't get this to work basically the alert never fires. I'm testing with just the alert functionality I have not even added in the agent job yet. I tested this by right clicking on my mirrored database and forcing it to fail over. Any help with this problem would be much appreciated

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• Is running multiple databases on login going to make my Mac really slow?

  - by Walrus the Cat

  Sometime ago, I installed Postgres, and the Launch agent that causes it to run when I log in. Just now, I did the same thing for Mongo. I was just about to do it for Couch. I don't remember if I ever did it for MySQL, but I probably did. Mongo and Couch are just 'when I have time to look into it' sort of things, but I don't want to have to remember to start them when I do. I have a 2.4 Ghz processor and 8 GB ram. Is this sort of behavior going to significantly impact my computer's performance? Should I be scrambling to uninstall all but the database I'm currently using, or can I install all the things and run them all the time? Thanks

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• flash h264 mp4 playback pixelation

  - by ndmweb

  Working with converting/playing h264 mp4 videos in flash. I'm converting the video from various source file formats (mostly .mov & .mp4), to h264 mp4 using ffmpeg server side. All seems to be working just fine, except I'm getting a few reports of pixelation of the video when being viewed on windows machines. I've testing just about every browser I can think of on (XP/Vista/7) and could not reproduce. Here's a screenshot: http://i.imgur.com/IK5RV.jpg (sorry for the resolution, was in an email from the client, as I'm unable to reproduce.) Anyone else ever run into this issue? At this point it could be anything in my mind. It seems like an odd bug, and probably a codec issue, or somehow a 32/64-bit issue?

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• How to failover to local account on a cisco switch/router if radius server fails?

  - by 3d1l

  I have the following configuration on a switch that I testing for RADIUS authentication: aaa new-model aaa authenticaton login default group radius local aaa authentication enable default group radius enable aaa authorization exec default group radius local enable secret 5 XXXXXXXXX ! username admin secret 5 XXXXXXXXX ! ip radius source-interface FastEthernet0/1 radius-server host XXX.XXX.XXX.XXX auth-port 1812 acct-port 1813 key XXXXXXXXX radius-server retransmit 3 ! line con 0 line vty 5 15 Radius authentication is working just fine but if the server is not available I can not log into the router with the ADMIN account. What's wrong there? Thanks!

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• How to find malicious IPs?

  - by alfish

  Cacti shows irregular and pretty steady high bandwidth to my server (40x the normal) so I guess the server is udnder some sort of DDoS attack. The incoming bandwidth has not paralyzed my server, but of course consuming the bandwidth and affects performance so I am keen to figure out the possible culprits IPs add them to my deny list or otherwise counter them. When I run: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I get a long list of IPs with up to 400 connections each. I checked the most numerous occurring IPs but they come from my CDN. So I am wondering what is the best way to help monitor the requests that each IP make in order to pinpoint the malicious ones. I am using Ubuntu server. Thanks

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• How Can I test my website using selemium Grid?

  - by prakash.panjwani

  Hello sir, I want to use selenium grid for my web page testing. I have successfully installed the demo of selenium grid on my PC and it is running fine. Now I want to run the test for my web site,but I am not getting how can I do that. Can some body give some example so that I will do that.I am a newer with selenium. I do not know much about selenium and Ant. Please help me . (I have basic knowledge about java.) Thanks In Advance

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• Outlook 2010 + Move IMAP PST file = Outlook data file cannot be accessed

  - by GWB

  I set up a new IMAP account in Outlook 2010. It works but creates IMAP PST file in C:\Users\User\AppData\Local\Microsoft\Outlook. I want the file on my data drive in D:\Users\User\Documents\Outlook Files (the same folder where outlook automatically creates the local Outlook PST. I followed the instructions here to move the IMAP PST. Testing the account (send/receive) works fine, but if I try to manually send an email I get error 0x8004010F Outlook data file cannot be accessed. I've tried repairing the PST using SCANPST (it always finds errors), and deleting and recreating the account but I get the same error. If I move the PST file back, it works again, but this is not ideal. Note: I don't think this is a duplicate of this question as the cause is different and the solution does not help.

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• Problem installing a w2k DC on Hyper-V?

  - by Tony

  Hi, We have a cluster with four node windows 2008 r2 and hyper-v installed. We would like to install 2 VM with role domain controller w2k (the domain is different from the domain of the hyper-v cluster). Do you know if there are any restriction on doing it? Some collegues say that we risk data corruption if we do live migrations. Others speak about the fact that Microsoft don't support w2k any more. And others have doubts because the global catalog server installed on these DC could have loss of performance. Any idea? Thanks Tony

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• VMWare Workstation 8, Sharing a VM without copying them to "Shared VMs location"

  - by Stebi

  I have a host computer (Win7-64) with three different harddrives. It runs several VMs which are distributed among those harddrives for a better performance. Now with VMWare Workstation 8 it is possible to "share" the VMs. I'd like to use this feature, but I have to convert the VMs to "Shared VMs". When I try this WMWare forces me to copy the VMs to one predefined folder, thus making my effort of distributing the VMs among the harddrives meaningless. Is there any possibility to keep the VMs where they are and share them anyway?

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