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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• How can I measure TCP timeout limit on NAT firewall for setting keepalive interval?

  - by jmanning2k

  A new (NAT) firewall appliance was recently installed at $WORK. Since then, I'm getting many network timeouts and interruptions, especially for operations which would require the server to think for a bit without a response (svn update, rsync, etc.). Inbound SSH sessions over VPN also timeout frequently. That clearly suggests I need to adjust the TCP (and ssh) keepalive time on the servers in question in order to reduce these errors. But what is the appropriate value I should use? Assuming I have machines on both sides of the firewall between which I can make a connection, is there a way to measure what the time limit on TCP connections might be for this firewall? In theory, I would send a packet with gradually increasing intervals until the connection is lost. Any tools that might help (free or open source would be best, but I'm open to other suggestions)? The appliance is not under my control, so I can't just get the value, though I am attempting to ask what it currently is and if I can get it increased.

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• Switching to tabs to the right or left of the current tab in Notepad++

  - by Christopher Swiedler

  How can I switch to the document to the left or right of the current document in Notepad++? For example, if I have documents A, B, and C open, and I'm currently editing B, I would like a shortcut to be able to switch to A (Alt-LeftArrow or Ctrl-Pageup) or C (Alt-RightArrow or Ctrl-PageDown). Is this possible? All I've found is a way to switch to next or previous documents based on the "history" of when the document was last opened (Ctrl-Tab and Ctrl-Shift-Tab), which are useful, but not what I want.

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• Iozone: sensible settings for a server with lots of RAM

  - by Frank Brenner

  I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, testing I/O with hardware RAID in various configurations, ZFS zRAID, as well as I/O performance on vSphere and with KVM virtualization. In order to see real disk I/O performance without cache effects, I tried running Iozone with a maximum file of more than twice the physical RAM as recommended in the documentation, so: iozone -a -g100G However, as one might expect, this takes far too long to be practicable. (I stopped the run after seven hours..) I'd like to reduce the range of record and file sizes to values that might reflect realistic performance for an application server, hopefully getting the run times to under an hour or so. Any ideas? Thanks.

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• Snow Leopard Hangs at Login Window

  - by jessecurry

  I've had an issue for the past few months, but I rarely restart so it hasn't caused too much trouble. Basically, when I start up my Mac (iMac10,1 - 3.06GHz Intel Core 2 Duo, OS X 10.6.3) everything proceeds as usual until I reach the login window. The login window displays normally, but keyboard and mouse input seem to be ignored. This condition persists for around 5 minutes at which time everything goes back to normal. While the login window is frozen my second monitor appears entirely blue, the second monitor receives a background as soon as the login window becomes responsive. If I startup while holding SHIFT the problem still occurs, but the freeze is much shorter. Looking through my logs I see no activity during the time that the login window is frozen. I've attempted to repair disk permissions, and gone through every possible maintenance option in Cocktail.

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• Backlight dimming don't work

  - by Mathias

  My Packard Bell EasyNote TS11HR notebook does not have an option for dimming the display backlight. At night, my eyes begin to hurt because of the strong light from the screen. My laptop is 2-3 months old and I am sure it has worked before. When I click on the battery icon in the notification area, it says in my language (Danish): "the setting for light does possibly reduce the life of the battery". However, I cannot dim the backlight. I have tried downloading programs for dimming the screen but they only make the screen darker, instead of dimming the backlight. I have tried updating my drivers and looking in the BIOS for a setting. I also plan to use an Ubuntu LiveCD to try controlling it. As of now though, the backlight is locked at maximum. Any ideas?

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• Resized NTFS partition, now it wont mount.

  - by H4Z3Y

  I have had a 1.5TB drive used as an external for 6 months or so, then I decided to put it in my linux server for network storage. ntfs was being crazy inefficient so I wanted to change the filesystem to ext4. I used the ntfsresize command to reduce the partition to 650GB and that took abour 2 hours, then I deleted all of the entries in fstab like a guide told me too and created a new one the size of the ntfs partition, or, 650GB. after I modified fstab the ntfs partition would no longer mount and when plugging it in to windows it says "This Hard Drive needs to be formatted". any ideas on how I can recover the data off of the drive? I have 600GB of free space on a different drive so I just need some way of copying them off.

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• Troubleshooting an iMac

  - by Matthew

  What can I do to fix my iMac? When I start it up, it just loads forever (never getting to the Desktop). The mouse will appear then disappear, then the loading bar will sometimes appear and then disappear and it just goes in circles forever. If I start up in safe mode (by holding shift), it gets to the login window. However, if I attempt to log in the login window disappears and reappears asking for my password again. What can I do to troubleshoot this?

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• Problem deleting files in Windows 7

  - by Alex Yan

  Happens sometimes but frequently enough to be a pain in the bum. I press Del or Shift + Del but the file stays there. Then when I try to delete it again, it says that I need permission from the Admin. For it to be deleted, usually I have to restart my computer List of things I've tried: I have admin privileges Hasn't happened since I reinstalled Windows and another form of this happened in my install before the last one I tried takeown in cmd but it says ERROR: Access is denied The files sometimes disappear by themselves after 2 mins or so Refreshing the folder doesn't do anything Unlocker doesn't work either. It asks me if I want to delete it the next boot Windows 7 x64 Pro HDD: Fujitsu MHZ2320BH G2 ATA 320 GB 8MB Buffer 5400 RPM

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• Toshiba laptop only shows black screen with mouse pointer after starting up

  - by BubblySue

  I only see black screen after the startup. It just shows the logo and the status bar upon start, then it goes black screen with moveable cursor. I tried alt+ctrl+del, but it doesn't work. I pressed shift 5 times and it makes a sound. I already removed battery and restarted it, but still the same. I can go to safe mode and scanned thru there. Still, desktop won't show up. Don't know what else to check?

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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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• ms access template where to find the vb code

  - by tintincute

  Hi I'm very new to this ms access 2007. I have a copy of a charitable contribution template charitablecontributions.accdb. I would like to know where I can find the code of it? I opened it by holding down the shift button and double click on it and it will open to a normal ms access where you can modify the table and so. But when I just click the file: charitablecontributions.accdb it will open to a formular view where the ribbon bars are gone. I wanted to know how, how is it possible to have this formular view? Because I have a Test.mdb from 2003 and I also would like it to be open like the formular view of charitablecontributions.accdb. I'll appreciate your help. Thanks

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• Powershell Set-Acl fails

  - by Ulrich

  While working on a little backup script I try to change the ACL of a file using Set-Acl in Powershell 1 on Vista and always get the following error message: Set-Acl : The security identifier is not allowed to be the owner of this object. This error persists even if I go a minimal script: $acl = Get-Acl $sourcepath$file $acl |format-list Set-Acl -path $sourcepath$file -AclObject $acl Does anyone know the reason for this error? Obviously I'm not changing the ownership of the file... BTW: What I ultimately want to achieve is to reduce all access rights to ReadAndExecute. Is there maybe an easier way of doing this in Powershell? Thanks for your help! Ulrich

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• Vim: I don't want to insert!!!

  - by bhh1988

  I could not find anything online addressing this problem, which is surprising. The problem is that I find it very easy to accidentally insert stuff in Vim. I know I can undo by with 'u', but it still is quite annoying and frequent. Often, I enter a command like 'sp file.txt' without realizing that I haven't entered the ':' character yet (so I'm not yet on the command line). Unfortunately, there are several characters that take you to insert mode, including 's', 'a', 'i', 'o'. I'd rather have insert mode mapped to just one keybinding which is very deliberate, like shift-space. Can anyone point me to something that might have what I'm looking for? Thanks.

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• Apache reverse proxy setup

  - by nixnotwin

  I have a jboss application server on machine1. The application address is http://ip-address:8080/webapp. I wanted to have only an ip pointing to the application. So on machine2 I setup an apache proxy. But it only helps to shift to port 80 but the directory webapp cannot be removed. So using proxy, the address is http://ip-address/webapp. So is there a way to just have the ip point to the application. For example the address http://ip-address should open the web page of the application.

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• Should a MobiTex service with a highly resilient website offer content over WAP?

  - by makerofthings7

  I'm trying to offer services over the MobiTex network (also see wiki) and want to reduce double-work. I'm trying to understand if it is a good idea to WAP enable my website. Given that WAP usage is increasing (since MMS is a hybrid of SMS + WAP), and the FCC has required every operator in the 700Mhz range to implement it I'd like to fully understand if there are benefits to the technology for certain critical applications. For example, if GPRS allows SMS traffic, voice, and Data, presumably they are handled by different Gateways. If there is another gateway for WAP traffic I would think that it would act as a backup if the data gateway was overloaded. Are there resiliency benefits to using WAP on a critical website? i.e. Content delivery (push or pull)

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• How to copy windows explorer file selections and past filenames as txt

  - by Ricky Williams

  Win7 How can I select multiple files in explorer and get a string of text listing the file names like i would get if i selected the files from within "open file" window of an application. for example if i have a Dir that contains 100 jpegs and i select 01.jpg, 05.jpg, 10.jpg in windows explore via ctrl+clicks or shift+click how can i get a text string that reads " "01.jpg" "05.jpg" "10.jpg" with or without the selected files full path " with out dragging the selected files to another window? I've tried copy and pasting into Note Pad and Word Pad and it either past the picts into the the application or a empty clipboard.

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• Can I copy from vim to another window without +xterm-clipboard?

  - by GorillaSandwich

  I'm using Ubuntu and vim. I can copy text from vim and paste it into another window by highlighting it in vim, then middle-clicking in the other window. This works fine when I'm on my local machine. I can also copy into the system register by highlighting text and yanking to the system register. (For example, Shift-V JJ "+ y to go into linewise visual mode, highlight two lines, select the '+' register and yank.) It's then available to paste into other windows. However, if I ssh into my web host, I can't do either of these. (They use some flavor of Linux - I think it's CentOS.) In vim, if I type :version, my local version shows +xterm_clipboard, but the host's version shows -xterm_clipboard. I don't have sudo rights there. Is there any way to be able to copy from their vim without getting them to tinker with the installation?

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• How do I create a script that checks if a computer is connected via wireless or ethernet?

  - by user4941

  I am using log-me-in Central to look after a few dozen computers. These computers are used both for home use and work use. When the computers are used for work, they should not be connected via wireless. In the best case, I'd like to be able to use LogMeIn to prevents users on shift from connecting wirelessly. Still acceptable would be to have the computer email me if it connects wirelessly. If I knew how to set up a script that checks to see if the computer connected wirelessly and I could send an email, then I would be set.

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• Where in the registry are application registered hotkeys stored?

  - by Stuart Allen

  I need to find in the registry the key that is holding the hotkey CTRL-ALT-SHIFT-E. This is normally a keyboard shortcut in Photoshop, but I installed some program that did a global override of this sequence. I have uninstalled that program, but it did not clean up after itself. So, where can I find this in the registry, I just want to delete this key so the global override won't affect Photoshop anymore. I've google'd the crap out of this, there are various program that claim to assist, but none of them work.

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• Laptop Brightness in Gnome and /proc - Thinkpad W510

  - by hakre

  I can set the brightness of my laptop screen already via /proc. I can read and change the value. Now I've set the value to 33 and then I went into gnome power management and enabled the option that it should reduce the backlight brightness being on battery. That works, the screen gets darker. If I now read out the current setting from /proc it still says it's 33. So I assume that there is another node in /proc to be used to control the brightness. The node I use so far is: /proc/acpi/video/VID/LCD0/brightness

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• Blackberry keeps sending notifications of FB and emails [closed]

  - by tfalise

  Here is the problem I got with my blackberry : I have received and sent multiple mails this week-end from my home computer. As usual, I received the notifications of sent and received emails on my blackberry, and archived / deleted them. But, I still receive the notifications of new mails several times a day, for emails I already have deleted in my Gmail account. I tried rebooting the blackberry (alt+shift+del) and removing the battery, but nothing helps, the notifications are sent and re-sent, no matter what I do. Anyone has an advice on how to stop this spam, as it is becoming very annoying ?

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• SSH and Latent Connections (e.g., satellite connections)

  - by user71494

  Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a satellite connection, while possible, is hardly desirable due to the high latency ( 1 second). My question is this: Is there any software that will do something like buffering keystrokes on my local machine before they're sent over SSH to help make the lag on individual keystrokes a little bit more transparent? Essentially I'm looking for something that would reduce the effects of the high latency for everything except for commands (e.g., opening files, changing to a new directory, etc.). I've already discovered that vim can open remote files locally and rewrite them remotely, but, while this is a huge help, it is not quite what I'm looking for since it only works when editing files, and requires opening a connection every time a read/write occurs. (For anyone who may not know how to do this and is curious, just use this command: 'vim scp://host/file/path/here)

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• How do you create a SQL query in Excel 2007 with a dynamic date range?

  - by Jordan

  I am trying to create a reporting spreadsheet that can print reports for a given time period. The query below works, but when I try to use a "?" parameter in place of the date, I get an error after selecting a cell containing my date. If I use single quotes ('?') I get a conversion from string to date/time failure, if I don't (?) I get a syntax error near @p1. Eventually I will need either a start and end date or a formula adding a month or shift to the starting date/time to filter the data down to important information. The query was built in Microsoft Query. SELECT FloatTable.DateAndTime, TagTable.TagName FROM master.dbo.FloatTable FloatTable, master.dbo.TagTable TagTable WHERE FloatTable.TagIndex = TagTable.TagIndex AND ((FloatTable.DateAndTime={ts '2012-06-01 00:00:00'})) Any assistance would be much appreciated. Thanks in advance.

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• Configuring memcached for a particular scenario

  - by pradeepchhetri

  I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow. In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached. Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time. Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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