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• Why is ext3 so slow to delete large files?

  - by Janis Peisenieks

  I have a server, which makes an incremental backup of a system every night. Now on saturdays, there is a full backup. But after the full backup has finished, a script kicks in, that deletes the incrementals. Now, the script sometimes breaks, and it is because the incrementals are each about 10GB files, and sometimes takes too long for the script. Now could someone explain to me, or point me in the direction of a resource, that explains why ext3 is so slow to delete files, when compared to, lets say, NTFS? I know theses are 2 completely different file systems, but I'm really interested why is there such a big difference in deletion?

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• Using Credentials with network scanners

  - by grossmae

  I'm testing out both Tenable's Nessus scanner as well as eEye's Retina for scanning network devices. I am trying to supply credentials to get deeper, more accurate results, however there seems to be no difference in the results whether I supply the credentials or not. I've read the documentation and it seems like I've tried all the logical settings in the Credential options. I've submit along with usernames and passwords for many different accounts and types of accounts (both SSH Credentials and Web Application Credentials) on the devices as well as their respective domain names (when applicable). Is there possibly a good test for either (or both) scanners to tell where these credentials are being provided (if at all) and if any of them are successfully getting authentication?

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• Signal strength and Speed of wireless network

  - by Tim

  As shown by Lenovo Access Connections on my Windows 7, the wireless network I am using has a speed of 54.0Mbps but a signal strength of 88%. I am using WinSCP with unlimited speed to download files. WinSCP shows that the speed fluctuates between 100 and 120KiB/s. I was wondering what are the difference between the two speeds from Lenovo Access Connections and WinSCP? How can I tell the actual speed performance, for example, from the above measurements: speeds and the signal strength mentioned in the two places. Thanks and regards!

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• Any experience with SATA SAS Interposer Cards?

  - by korkman

  Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-SAS interposer cards. Advertised as "seamlessly adding SAS capabilities to existing SATA disk drives", I wonder if anyone here has had some experience with these or similar products. The major benefits I can identify are the increased cable voltage (if all drives are SAS connected), the ability to power-cycle the drive and multipath (if desired). Obviously the SATA drive will still have to be RAID edition. The question is: Do these cards indeed increase the overall reliability of a storage system, or will failing SATA disks cause trouble nevertheless? Edit: I'm not asking for hypothetical answers, only actual experience please. I'm well aware that the typical 10k SAS drive is more reliable (and better performing) than 7200 SATA drives. But how does a nearline SAS, which is phyiscally the same disk as its SATA counterpart, compare to the SATA version with interposer?

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• Is rsync --delete safe in case of disk failure

  - by enedene

  I have two data hard drives on my Linux server and I use second as a backup for a first drive. I use rsync for that purpose. An example would be: rsync -r -v --delete /media/disk1/ /media/disk2/ What this does is that it copies every file/directory from /media/disk1/ to /media/disk2/ but also deletes any difference. For example, lets say that files A and B but not file C are on disk1, and on disk2 there is no A and B files, but there is C. The result would be that after the command on disk2 I'd have files A and B, but file C would be deleted, just like on disk1. Now, a rather disastrous scenario had crossed my mind; what if disk1 dies, system continues to work since system files are on my system disk, but when rsync tries to backup my data on disk2 from broken disk1, it deletes all the files from disk2 because it can't read anything on disk1. Is this a possible scenario, or is there a protection from it build in rsync?

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• Fan is spinning too fast just in Windows - software?

  - by B. Roland

  I've recently replaced my fans (CPU, GPU, and bought a CHA fan). The GPU remained the same, but I've seen it when it was spinned 2 times faster, than it usual... but it is rarely. The problem is, that the CPU fan in Windows (especially 7) spinned too much, 'cos it keeps in under 40°C, and it is spinning with 3300-3600 RPM, which is too high I think. If I swich to Ubuntu, it keeps on ~40-45°C with with 2500-2800 RPM, which is a big difference in numbers, and in noise. I'm looking for a manual fan control solution, or just reduce the Windows' multipliers of fan speed control, somehow... I was bought the new fans because of the lower noise (and it does it, but not with 3.6k RMP). Thank you!

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• Network? or router? problem

  - by Robert H Mercer

  I have two computers networked through a Netgear WG914 router which is connected to an Ipstar satellite modem via the RG47 LAN connector. The main computer is running Windows 7 Pro 64bit and the secondary computer is running Windows 7 Home Edition 32bit. On occasion there is a loss of internet connection usually on the main computer, often followed by a loss on the secondary comuter. Not, however, always the case. Windows troubleshooter, naturally, is about as much use as a politician in government.......NONE. There appears to be no problem with the ISP bad as it is and often the connection will be remade without any help from me. The difference in the OS's is not of any relevance since I had this problem before I changed over to Windows 7. Not being a nerd when it comes to networking I wonder if anyone has any constructive suggestions.

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• Word to GIMP pasted image too small

  - by Marcelo Cantos

  I paste an image from Microsoft Word 2010 into GIMP 2.6.10 using Edit ? Paste as ? New Image, but the pasted image is less than half-size (1280×800 down to 553×347). Pasting into an existing blank 1280×800 image makes no difference. On the other hand, pasting exactly the same clipboard entry into Windows Paint works beautifully, producing a razor-sharp 1280×800 image, and furthermore, pressing Ctrl+C in Paint, then going to Gimp and pressing Shift+Ctrl+V in Gimp produces the correct full-size image in Gimp too. Why does pasting an image directly from Word to Gimp reduce the image size? How can I make it paste the correct image size without having to go via Paint? UPDATE: I just noticed that cutting the image from Word and pasting back into the same document also loses definition. Paint must be magical.

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• Should I format USB sticks and SD cards to FAT, FAT32, exFAT or NTFS? (Windows files, live Linux distors)

  - by superuser

  Does it depend on the media size which one to chose or on some other parameters? In Windows 7 FAT16 is the default. In pendrivelinux.com's Universal USB Installer FAT32. Which one to chose? How about NTFS for Windows use? How about exFAT? It is tne Microsoft designed filesystem for removable media. Is there a difference in USB sticks and SD cards in this regard? Edit: seeing developments in the other thread, should I still use something like exFAT if I don't want Recycle bins created on every single machine I plug my USB thumb drive in?

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• Windows 7 XPS Document Writer has stopped working

  - by jamie

  I have successfully used the Windows 7 XPS Document writer for quite a while under windows 7 (64 bit). Now however when i try to print i get prompted twice for the output file name and then get different error messages depending upon the application being used. e.g. Notepad gives a 'The I/O operation has been aborted because of either a thread exit or an application request'. I have disabled and reenabled the XPS facilities of windows features and have similiarly removed and readded the printer. But the end result is the same. I've uninstalled all applications i have installed since the time when i know it worked but this also has not made any difference. Suggestions please!

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• RHEL raw device (over VMware RDM) performance issues

  - by jifa

  I'm running RHEL 5.3 over vSphere 4.0U1. I configured multiple LUNs on my NetApp (Fibre) storage, and added the RDM on two (Linux) VMs, using the Paravirtual SCSI adapter. One LUN is 100GB in size, successfully mapped to /dev/sdb on both VMs, 5 more are 500MB in size (mapped to /dev/sd{c-g}. I also created one partition per device. I have encountered two issues: First, writing directly to /dev/sdb1 gives me ~50MB/s, while any of the /dev/sd{c-g}1 gives me ~9MB/s. There is no difference in configuration of the LUNs apart from their size. I am wondering what causes this but this is not my main problem, as I would settle for 9 MB/s. I created raw devices using udev pretty straightforwardly: ACTION=="add", KERNEL=="sdb1", RUN+="/bin/raw /dev/raw/raw1 %N" per device Writing to any of the new raw devices dramatically slows down performance to just over 900KB/s. Can anyone point me in a helpful direction? Thanks in advance, -- jifa

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• 32 vs 64-bit software for same machine?

  - by GorillaSandwich

  What is the difference between 32 and 64-bit software? My understanding is that 64-bit can use more RAM, if it's available, because it has a larger address space for it. Is this correct? And, specifically: If I have a 64-bit operating system with lots of RAM, and I install, say, the 32-bit version of MySQL instead of the 64-bit version, will it be unable to use all the available RAM and therefore run slower than the 64-bit version might on the same machine (assuming RAM becomes the bottleneck before processing speed or disk access speed or whatever)? If I have a 32-bit operating system and I install a 64-bit piece of software on it, will it (probably) fail to run?

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• How to send Bluetooth audio to non-Bluetooth speakers?

  - by wonsungi

  In short, I am looking for a Bluetooth-3.5 mini stereo converter. What is this type of device called, and what are some of the best models (is there a difference in audio quality/lag)? I wish to connect some speakers (Altec Lansing inMotion IM7), which does not support Bluetooth, to my laptop (Lenovo X301) wirelessly. Currently, I can connect my laptop's headphone jack to the AUX jack on my speakers via a mini stereo cable. How do I replace this cable with some type of Bluetooth setup? I am not sure what this Bluetooth device is called. I thought I found something, but it actually does the opposite of what I need (3.5 mini stereo-Bluetooth). (My OS is Vista Enterprise, if that matters)

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• Testing performance from around the world - how do I get a linux shell easily in multiple countries?

  - by Matthew O'Riordan

  We are building a socket based service where latency is paramount, and as such we have servers distributed into 7 data centres around the world. However, whilst we know we're bringing the servers closer to the clients, it's very difficult to know how effective this is, and importantly, what difference this makes compared to our competitors. As such, we want to run simple scripts that test latency and throughput for both our service and our competitors, which is easy enough using Amazon, however Amazon only have 7 data centres. We would like to know for example how we perform in locations all over the world such as South Africa, Australia, China, Peru etc. Does anyone know of any service where we could piggy back off their global infrastructure and run some scripts to test this performance? The obvious contenders are people like Monitis, but I don't think they would allow us to run custom scripts, only standard protocol monitors. Thanks for your help. Matt

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• access netatalk share on osx permission issue

  - by Fresheyeball

  I have two users in ubuntu. My first was me and I am the owner of the folder in question. The second is my wife. Netatalk is running and we can both see the folder on the network. However I can access it but she cannot. She gets an error in osx "... you don't have permission to see its contents". I have use chmod 777 on the folder but it made no difference. Any ideas? UPDATE The directory in question is a mounted harddrive at /media/ourPhotos

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• Enabling Compiz Viewport Switcher key bindings

  - by David Moles

  I'm running compiz 0.8.2 with compizconfig on Scientific Linux 6.2 with Gnome 2.28.2. In the compizconfig "General Options" I have "Desktop Size" set as follows: Horizontal Virtual Size: 6 Vertical Virtual Size: 1 Number of Desktops: 1 This gets me the layout I want, i.e. 6 workspaces in a horizontal layout. Ctrl-alt-cursor-keys work fine for switching between them. However, I can't figure out how to get key bindings for specific workspaces. I've tried enabling "Viewport Switcher" in compizconfig, and tried various combinations both in "Number-based viewport switching" and "Go to specific viewport", to no apparent effect. My first thought was that something else was eating the specific key bindings I chose, but I think I've tried every combination of shift, control, alt and super (i.e., the Windows key) by now. I tried setting 6 desktops under "General Options" instead of one desktop with horizontal virtual size 6, but that doesn't seem to make a difference either. What am I missing?

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• Windows Services don't automatically start after reboot?

  - by James Crowley

  We've got some Windows services written in .NET. They start fine manually within the services mmc, but despite being set to Automatic, they never start when powering on (or rebooting) the machine. Update In the event log, instead of seeing "xyz started", alongside all the other services starting, I just see "The xyz service entered the stopped state." and a seperate error that says "A timeout (30000 milliseconds) was reached while waiting for a transaction response from the slsvc service.". If I manually start them, then I get a normal in the event log as expected, and all is fine - until the next Windows Update patch which forces a reboot and all the services are off again. Any ideas? I've tried setting them to Delayed Start with no apparent difference.

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• Why is my wireless so slow compared to my wired download speed?

  - by Shawn

  I just used speedtest.net (using Firefox) to compare my wired connection speed with my wireless connection speed. With my current contract (with Videotron), I'm supposed to get Download speed: 8Mbps Upload speed: 1Mbps Here are the results of the speedtest.net test: Wired Ping: 14ms Download speed: 8.41Mbps Upload speed: 1.04Mbps Wireless Ping: 16ms Download speed: 0.18Mbps Upload speed: 0.98Mbps The difference in download speeds seems staggering to me since I did the test 1 meter aways from my router. Any clue as to why my wireless download speed is so low compared to my wired download speed? using Ubuntu 11.04 on an Acer Aspire 5536-5519 Oh and it might be worth mentioning that my girlfriend has no trouble at all with her wireless connection. No slowness at all. (She uses Firefox on Windows 7 on a Dell) Here's the results for the same test on her system: Ping: 22ms Download speed; 8.44Mbps Upload speed: 1.02Mbps

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• Linux Mint on VirtualBox has no internet connection

  - by Martin

  Physical machine: Mac Mini running OSX 10.7.5 Virtual machine: Linux Mint 15 Cinnamon 64-bit Using VirtualBox. I am trying to make the linux connect to the internet. For some reason I can access the host computer with 192.168.2.100. Its set up to show me a web-page that says "It works". This I can see from the linux. But I cannot reach anything on the internet. Either FireFox says "Unable to connect" or when I run nslookup google.com I get connection timed out; no servers could be reached. My setting on VirtualBox under the Network tab are: Bridge Adapter vnic0 promiscouos Mode:Allow All`. If it makes a difference, the host has a WiFi connection to the home router. What have I missed?

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• Highlighting subroutines in Notepad++

  - by predatflaps

  I would like to highlight the contents of IF statements in a slightly different colour from the background, so that I can see them more easily. Is it possible in Notepad++? it would be amazing to highlight all the nested subroutines in a function in slightly different light/dark colours depending on the scheme so that you can straightaway see the commands at a glance without spying out the curly brackets. not psychedelic colours, just slightly visible background colour difference. wouldn't it be great? Function Foo(){ highlight one color if(){highlight color2 for(){highlight color3 if (){hilghlight color4 } } } } }

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• Centos + CPanel results in php always running as fgci, instead of cli, as expected

  - by quamis

  I'm having problems with a server configured by someone else. It uses CPanel, and it has Apache+PHP. For some reason, when running php -v as a user, i get "cli" as handler # php -v | head -n 1 PHP 5.3.27 (cli) (built: Oct 15 2013 16:06:48) If a make a PHP script with echo shell_exec("php -v | tail -n 1"), i get PHP 5.3.27 (cgi-fcgi) (built: Oct 15 2013 16:22:16) Why the cli/fcgi difference? I need to fix this so that scripts ran by the apache user would be running as "cli", not "fcgi". As a side-note, i'm not sure how php got installed, because in the package list i see another version installed, instead of the pne reported by php -v # rpm -qa | grep php [.... other packages...] cpanel-php53-5.3.17-5.cp1136.x86_64 rebuild_phpconf --current: /usr/local/cpanel/bin/rebuild_phpconf --current Available handlers: suphp dso fcgi cgi none DEFAULT PHP: 5 PHP4 SAPI: none PHP5 SAPI: dso SUEXEC: enabled RUID2: not installed redhat-release: # cat /etc/redhat-release CentOS release 6.4 (Final) possibly related to http://superuser.com/questions/665809/centos-6-4-running-php-for-root-as-cgi-fcgi-not-cli

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• HP Pavillion dv6 laptop - 15 beeps on startup and a black screen?

  - by dunc

  Usual story - girlfriend's step-brother's laptop is broken. I don't know a huge amount about what occurred before it broke, but I do know the following: When you try to turn the laptop on, it beeps 15 times exactly. The screen remains black. The LED on the Caps Lock key flashes continuously. If left on, the laptop never boots - as far as I can see. If left on, on a stable surface with decent ventilation for a relatively short period of time, the laptop (below keyboard, but not where the RAM/HDD are) gets very hot. I've tried doing what most websites appear to recommend for similar problems, which is to disconnect AC and battery then hold the power button down for a minute before reconnecting the AC and trying to turn the laptop on - no difference. EDIT I've also tried re-seating the RAM, to no avail. Any ideas? Thanks in advance,

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• Get-QADComputer -LdapFilter & NOT operator

  - by dboftlp

  I'm having issues excluding an OU from my LDAP filter $DaysAgo = (Get-Date).AddDays(-31) $ft = $DaysAgo.ToFileTime() Get-QADComputer -SizeLimit 0 -IncludeAllProperties -SearchRoot 'DC=My,DC=Domain,DC=Local' -LdapFilter "(&(objectcategory=computer)(lastLogonTimeStamp<=$ft) (!(ou:dn:=DisabledPCs))(|(operatingsystem=Windows 2000 Professional) (operatingSystem=Windows XP*)(operatingSystem=Windows 7*) (operatingSystem=Windows Vista*)(operatingsystem=Windows 2000 Server) (operatingsystem=Windows Server*)))" I'm looking to query for all Windows OS systems that haven't logged in to AD for more than 31 days & that are not already in the OU "DisabledPCs", which is where I'll be moving them to. When I run it now, I'm getting all the systems I'm looking for, including those in the "DisabledPCs" OU... I've tried several variations including: (&(!(ou:dn:=DisabledPCs))) As well as putting it in different locations in the filter (not that I thought it would make a difference, but I obviously don't know that...) Thanks in advance for any help, -dboftlp

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• Outlook Replies with Inline Comments

  - by BillN

  I have a user who uses Word as his e-mail editor. Often when replying to an e-mail, he'll insert his comments into the body of the original e-mail. Since he is using Word as the editor, these show as [User Name] Comment Text in a contrasting color. However, some users see the comments in their Outlook, and others do not. I've tried Selecting/DeSelecting Word as the e-mail editor on the recipients, and it does not seem to make a difference. We are using Exchange 2007 with Outlook 2003 and Outlook 2007 clients along with a few Entourage Clients. There does not seem to be a pattern related to which client is used, but Entourage seems to be more likely to have the problem. TIA, Bill

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• Remote desktop pressing Windows key randomly

  - by wikiti

  When I'm using remote desktop at work from one specific PC it has a quirk which is really quite irritating. I'll be typing away and suddenly the Windows key will be pressed, things start minimising, explorer launches, workstation gets locked (but it locks the remote workstation, so I have that wallpaper in the background, rather than the wallpaper from the local machine as I would expect). I've swapped keyboards, even though it didn't seem to be related to hardware and it made no difference. Done some internet digging and found someone saying it's related to using windows-l to lock the workstation. I've tried to stop myself using that shortcut to see if it helps and have failed miserably :D It's happening to at least one other user remote desktopping from the same machine to a different PC. Reinstalling isn't really an option (I don't admin the PC or I would have tried it, grr), although I could probably get it done if it would definitely resolve the problem. Any ideas?

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