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• High CPU Steal percentage on Amazon EC2 Instance

  - by Aditya Patawari

  I am experiencing high CPU steal percentage in a Amazon EC2 large instance. I know it means that my virtual CPU is waiting on the real CPU of the machine for time. My question is that what can I do to reduce this percentage and get maximum out of the CPU? Steal percentage is consistently at 20%. System load crosses 10 when this happens. I have checked memory and network and I am sure that they are not the bottleneck. Is that normal for such environment? Also are there any system level optimization techniques for reducing steal percentage form the virtual instance? avg-cpu: %user %nice %system %iowait %steal %idle 52.38 0.00 8.23 0.00 21.21 18.18

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• Install Second Copy of Windows in a Partition, Block Access to other Partitions

  - by Mat

  I want to lend my computer to my flatmate so that he can play some games for which his computer is underpowered. Is it possible to install a second copy of Windows 7 into a separate partition and configure it such that it has no access to the other partitions and disks on the computer, the ones that I use in my main Windows install? I'm not concerned about security, just want to avoid him accidentially messing with my data somehow. Can I do that?

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• Difference between all servers in one cluster and more than one cluster with servers?

  - by silla

  Not sure I understand what´s the difference or how it works when servers a running in one cluster or if there are more than one clusters with servers in it - regard High availability & Load Balancing. For me they are somehow the same, there is not really a big difference. Let´s make a simple example: 2 Servers in 1 Cluster 2 Clusters with each 1 Server - 1. If one Server failure, the other one is able to continue the work. The same for Load Balancing, these two Servers are able to balance the work together. - 2. The same thing! If one Server failure... The only thing that could be a problem with point 1. is if the Cluster fails (then both of the Server are dead). But is this even possible? I was reading stuff about clustering and high availability but I think I do not get this really. Probably I did not really understand how a cluster is working. Are these 2 points with 1 Cluster and 2 Clusters somehow the same or are there really some big differences? What should I know about it? Thank you

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• Removing 'bundled' software to make a slow laptop faster?

  - by spdegabrielle

  My brother-in-law has a cheap HP laptop used by his kids for schoolwork. It had got into a bit of a state and was running slowly with some dubious software. I removed a bunch of stuff that had been installed, that was obviously not required (three different driver scanners!), had been downloaded in error or looked like malware. I also disabled as many 'start on login' apps as I could and removed AVG replacing it with MSE. (AVG is uninstalled and replaced with MSE after failing to detect malware) What remains is a significant quantity of bundled HP and 'nero backup' software, including a HP restore utility (apparently something like the osx hidden partition restore), the trackpad driver. is there anything else I can do to breath a little more life into the old 'celeron' laptop? Should I bit the bullet and just put win8 on it? Will the trackpad still work?

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• How do I improve picture quality while streaming live football (soccer) from my Dell D600 to an HDTV?

  - by Bob

  I have fibre broadband with speeds up to 38mbs, my Dell D600 has its max 2gb ram and has an ATI Mobility RADEON 9000 4xAGP 32mb card in it...Its TV support it says is NTSC or PAL in S-video and composite modes with a 7-pin mini-DIN connector (optional S-video to composite video adapter cable) and a vga port which i am using at the moment... The laptop runs Windows XP, an 80g HD with only windows + necessary updates and anti virus software on it..... There is HDMI on the TV, but not the laptop Fairly slow moving and close up pictures arent too bad, but when the movment is fast(a shot on goal) or in the distance, I cant see the ball and the images go out of focus.

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• Windows 2008 R2 on ESXi 4.1 cpu utilization kernel high

  - by MK.

  I have a Win2k8 guest running on ESXi 4.1. The host has 12 cores and the problem happens even if the guest is the only VM on the host. We have 4 cores dedicated to the guest. We noticed that network starts chocking when the CPU load goes up. After some testing we noticed that when running a simple CPU hogging tool set up to run 3 threads at 100% the regular CPU load goes to 75% like it should and the "kernel times" graph in task manager goes up to 25%. My intuition tells me that the network problem and kernel times problem are the same. This is confirmed by another similar VM we created on the same host which doesn't have either of the problems. VMWare tools are obviously installed. The nic is e1000. What else can we do to troubleshoot this?

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• How can I increase the size of the hard disk used by my Virtual Machine Manager (VMM) vm?

  - by Scott Langham

  In Virtual Machine Manager admin console, I used the 'New virtual machine' wizard and created a machine from an existing template. When I got to the Configure Hardware step, I selected the primary hard disk (which is a dynamic) disk and tried to increase it's maximum size, but this control is disabled so I can't increase it. It's not big enough for my purposes. how do I increase the maximum size of the hard-disk? Thanks. Edit: I am able to add a second hard disk of a size I specify. That's not useful though as I'm trying to install some software, some of which insists on being on drive C.

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• What is the maximum memory that an IIS6 web site/app pool can use?

  - by Robin M

  I have an IIS 6 server running on Windows 2003 SP2 x86. The server has 4GB of RAM and runs consistently with 2GB allocated. I realise that with x86, the server won't utilize all of the 4GB RAM and the application space is also limited but the IIS processes seem to be limited elsewhere. w3wp.exe never has more than 500MB allocated and I occasionally get OutOfMemory exceptions from a busy .NET application (there are several applications running, each with a separate application pool). What is the maximum memory that an IIS6 web site/app pool can use?

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• Is Joerg Schilling’s “sdd” a full replacement for “dd”

  - by fishtoprecords

  I was directed to post here, I started on Stackoverflow.... I'm trying to use 'sdd' on my Debian system, and can't get one set of options to work. They do work in 'dd' so I am wondering if I am specifying them incorrectly, or if sdd didn't implement them, or something else. What I want to do is sdd if=/dev/hdh1 of=/bay5/imagebay1 bs=4096 conv=sync,noerror if I leave out the "conv=..." option, it works, or at least starts copying data. sdd if=/dev/hdh1 of=/bay5/imagebay1 bs=4096 Can you shed a bit of light?

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• Send request body data when running siege

  - by qui

  I am trying to use the command line utility Siege to load test a service. The service recieves json in the request body via a POST. I have a file called example-data.json with the json inside. I will eventually turn this into a tiny service which creates random json for testing, but this should do for now I have another file called hit-qa.siege with http://www.qa-url.com POST < example-data.json and i try and run siege -c10 -d1 -r1 -f ops/perf/hammer-dev.siege When I check the logs of the service, it is not recieving anything in the request body. My googles have been fruitless, does anyone know how to accomplish this?

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• Any real benefit from eBoostr?

  - by skevar7

  Is there any real data on this question?

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• Windows Explorer - How can an large file have a zero "Size on disk" value? What does it mean

  - by Jaans

  I would expect some discrepancy between "Size" and "Size on disk" in Windows Explorer due to file system allocations etc. Below is a screenshot of an example file on a Windows 2012 R2 file server that has a 81.4 MB "Size" but for the "Size on disk" it's 0 bytes. What gives? I have other files doing the same, but yet another set of files and folders behaving as expected showing the size on disk relatively close to the actual file size. The volume is a basic disk, formatted with NTFS and the default 4K allocation units. No compression is set for any file or folder on the volume. (For those more paranoid, I did a malware scan, and also confirmed there is not ADS streams associated with the file in question). The user account running Windows Explorer is the domain administrator, and the file owner is also the domain administrator. Thanks for reading!

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• Bringing my Dell XPS 13 ultrabook back to factory state

  - by TysHTTP

  I have a brand new Dell XPS 13 ultra book. After i picked it up at the store, i wiped the exising partitions which also contained the restore/rescue data, which you need to reinstall the factory version of Windows 8 that comes with this machine. I did this because we have a different MS partner edition of Windows which i prefer to run. After doing all this, i noticed that there was something wrong with machine. No real damage, but the specs are not completely as they should be. Turned out that a simple mistake while ordering. Now, long story short, the shop says that it has no problem with taking the product back, as long as it is in it's original state. And this is the problem i'm having, because i formatted the original partitions that contain that rescue option / windows 8 setup, i don't have a clue whether it's possible to get back to that original. Does anyone have an idea on how to get this fixed?

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• How to speed up Ubuntu on a netbook

  - by c1

  How do I speed up the latest version of Ubuntu on a VIA C7-M 1.6 GHz based netbook (HP 2133)? For example, full screen videos are very slow in the default configuration.

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• Increase/refresh the size of the FreeBSD's main partition

  - by Lucas

  I am using VirtualBox and have my FreeBSD mounted on a virtual drive, which recently ran out of space (10 GB) so I have increased the Virtual Drive size up to the 15 GB - started my FreeBSD and its still out of space, because it doesnt "refresh" the main partition size: # df -h Filesystem Size Used Avail Capacity Mounted on /dev/ada0p2 9.3G 9.3G -711M 108% / devfs 1.0k 1.0k 0B 100% /dev How can I set the partition size to the virtual drive size?

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• "Raid 0 SAS" versus "2nd generation SSD"

  - by Stefano

  Hi everybody, i was planning to buy a SAS system made of two 15k RPM disks in Raid 0 configuration to give a boost to my s.o. and my apps... but after i saw that article on Coding Horror, i've started to thinking if a new 2nd generation SSD could do the same job, or even better... Does anybody have any information to help me decide?

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• TrueCrypt - "Warning! Password locked: Fixed disk0" error message on boot

  - by Tibi

  TrueCrypt - "Warning! Password locked: Fixed disk0" error message on boot. When i start my laptop (Acer TravelMate 2410). after the starting memory check, the screen goes full black, and a message appears for about 3 seconds: Warning! Password locked: Fixed disk0 and after that, disappears, and next message comes out: Operating System Not Found and all stops here. Windows Xp was installed on it, before this came. TrueCrypt cd (witch was made during the process of full encryption) is not working, not in restoring MBR, no even in decrypting my drive - completely useless. Note: I detected some short of boot sector errors (i dont know the amount) on my drive before this happened. Please, i would greatfully thank every comment, or suggestion, because my computer is unusable now. The HDD is a Samsung HDD, 160Gb. Other preferences: Acer TravelMate 2410 Notebook, 2 Gb RAM, 1500 Mhz Intel Celeron M processor. Regards

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• How expensive is a hostname in htaccess? Other solutions possible?

  - by Nanne

  For easy allow or disallowing of dynamic IP-adresses you can add them as a hostname in a .htaccess file. As I have read from: .htaccess allow from hostname? it does a reverse lookup on the connecting ip address, seeing if the response matches the allowed name. (Well, actually Apache is doing a double lookup, first a reverse lookup and then a forward lookup on the result of the reverse.) This is the reason we are currently not using dynamic-ip hostnames in the .htaccess: this "sounds" quite heavy: 2 extra lookups for every request. Is this indeed quite heavy, and would a reasonably busy server that is rather looking for less then more load get away with this :)? (e.g.: how does this 'load' compare to the rest? If a request is 1000 times more expensive then the lookups it might be negligible. otoh, it could be that final straw :) ) Are there other solutions? I can write a script that does a lookup of the hostname and put it in .htaccess files ofcourse, but this feels a bit like a hack.

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• Exclude a process from being listed in `top`

  - by warren

  Is it possible to exclude some processes from being reported by top? For example, I would like to exclude itself from its listing (ie, I don't want top to show in the process list). I would also like to be able to exclude processes that do not belong to the user running top (except for root). Is this possible? If so, how? If not, is there a similar tool that will do what I want (that does not involve running something like ps frequently).

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• How do I remove 1,000,000 directories?

  - by harper

  I found that in a directory more than 1,000,000 subdirectories has been created due to a bug. I want to remove all these directories, let's say in the directory WebsiteCache. My first approach was to use the command line tool: cd WebsiteCache rmdir /Q /S . This will remove all subdirectories except the directory WebsiteCache itself, since it is the current working directory. I noticed after two hours that the directoriws starting with A-H have been removed. Why does rmdir removes the directories in alphabetical order? It must take additional effort to do this ordered. What is the fastest way to delete such an amount of directories?

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• Why can't I extend the C: drive on Vista? Because I have Free Space to its right instead of Unalloca

  - by tzup

  Okay this is annoying! I have a C: drive that is the primary partition (bootable) that I would like to extend. In order to do that it seems like I need to have Unallocated Space to the right of the partition. Right now, I have "Free Space" to the right. How in the world do I make it Unallocated (not formatted)? There must be some command line utility to be able to do this. Please help!

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• Tracing slow Java I/O in Solaris 10

  - by antispam

  We have a Java application which is significantly slower in Solaris 10 server than in Windows PC. We have profiled (-Xprof) the application and observed that UnixFileSystem.getBooleanAttributes0 method consumes about 40% CPU time with native calls. How can we follow our search to identify which is the cause of the slow behaviour? Thank you very much.

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• Running Windows XP with VMWare Fusion from a Fujitsu-Siemens recovery disk.

  - by Time Machine

  I have installed a trail version from VMWare Fusion. I had (sold now) a very old Fujitu-Siemens laptop (from around 2001) which came with two recovery disks (which I still have :P). One recovery disk is a Windows XP installer, the other is a disk with drivers and useless software you will never use and run permanently in the background. If I install Windows XP from the recovery disk (which did not contain any software except what comes with Windows XP, for as far as I know), will it run in VMWare Fusion? Or do I really have to buy/pirate a new Windows XP installation disk? Thanks. Yes, I need XP, not 7.

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• trying to setup multiple primary partitions on ubuntu linux [migrated]

  - by JohnMerlino

  I currently have ubuntu desktop installed on a harddrive. I want to partition the harddrive so that I can reserve 30 gigs for ubuntu server and 30 gigs for ubuntu desktop. The drive has 300 gigs available. Right now I am booting from dvd drive and installing ubuntu server. I selected "Guided partitioning" and created a 30 gig primary partition of Ext4 journaling filesystem, set "yes, format it" for format partition and set bootable flag to on. I intend to use this 30 gig partition to hold ubuntu server and allow me to boot from it. Now I have two other partitions. They are both set to "logical", one is currently using 285.8 gigs and is using ext4 (when I try to set bootable flag to true, it gives a warning "You are trying to set the bootable flag on a logical partition. The bootable flag is only useful on the primary partitions"). More alarming it says "No existing file system was detected in this partition". Actually, Im thinking that this is the parittion that is supposed to be holding my current Ubuntu Desktop. And of course I want this to be bootable and be a primary partition, so I could dual boot from this and the server partition. Now the third partition is also set to logical and it is being used as swap area. My question is regarding that second partition. Its supposed to be a primary partition thats holding my existing ubuntu desktop edition. How do I switch it to primary and to make sure that its pointing to my existing desktop installation?

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