General :: Difference Between Buffered Disk Reads And Cached Reads?

Jul 13, 2011

I was analyzing the Disk read using hdparm utility. This is what i got as a result.


# hdparm -t /dev/sda


Timing buffered disk reads: 108 MB in 3.04 seconds = 35.51 MB/sec


# hdparm -T /dev/sda


Timing cached reads: 3496 MB in 1.99 seconds = 1756.56 MB/sec I m not sure what does Cache read and buffered disk read mean.

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General :: Monitor Disk Reads Versus Writes?

Jul 2, 2010

We are graphing various system parameters using Cacti. One of our graphs shows hard drive reads and writes. A question came up: why do we need this graph?

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Ubuntu Servers :: Raid1 Reads At Single Disk Speed?

May 3, 2011

im on 10.10(desktop) and mdadm was v2.8.1 from 2008, very out of date so i tried 3.2.1 -> no change. mdadm raid1 read speeds are the same as single disk. note i used the tests in the disk utility benchmarking tool at first --these showed raid 5 atleast to be much better but when i tried dd reads raid5 dropped off with larger data to almost the same (slow) speed as raid1. compare:


using two partitions will be enough to show raid1 performs at single disk speed. I dont really want to use a 4 disk raid0 just to get the read speed i should be able to get with raid1 as i dont really care about the size loss. I would of course use raid10 but i have found this suffers from the same problem (achieve same read speed as 2 disk stripe). So whilst im shocked others aren't reporting this, unless there is some obscure reason why my system would give these results i think raid1 in not behaving as it should.

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General :: CD Reads On Win98 But Appears To Ber Empty On Fedora14

Apr 27, 2011

I got a CD with a book - doc files.When I look at it with nautilus or with wine notepad it tells me that the CD is empty. capacity 49.4 MB. It does show the name of the CD BOOK2XTRAS - so at least the name field in the first sector is where it is supposed to be.When I boot to my 2nd drive - an old win98 sys - it sees all the files on the CD. Same CD drive in each case. I go to another fedora computer I have and it does n.ot see the contents either.

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General :: Shell Script That Reads From Parameters File?

Nov 3, 2009

what I am trying to do but I am not sure exactly how to do it. I want to write a shell script that will replace certain values in a file with environment specific information that it pulls from a parameters file. The paramaters file looks like the following...



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General :: Bash Script That Reads Files In Directory And Processes Them?

Jan 22, 2010

I am trying to create a function within my .bashrc that will process all of the files that do not end with .sh within a directory and execute them.The following is what I have so far. I am missing a way of excluding files that end with .sh though.

function startall {
for file in /etc/init.d/*.; do
"${file}" start


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General :: Program That Reads Multiple Pipes / File Descriptors And Writes To Standard Output

Feb 23, 2011

Is there already a program that reads multiple pipes or file descriptors and writes to the standard output (not splitting lines).Like cat, but reading all files simultaneously and preserving lines.It is needed to avoid coding of select/epoll loops or using multithreading in simple programs. Like "select loop for bash".

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General :: Write A Script To Execute A Fortran Code That Reads In Parameters From Keyboard Typing?

Apr 18, 2011

I am trying to write a script (especially C-shell) to execute a fortran code that reads in parameters from keyboard typing. I will have to process this .F code for many times with the parameters the same for all my data files, therefore, I don't have to type in everytime I execute the .F code. But I don't know what is the command in c shell to read in a text files that contains all the parameters I want and can make the shell read in appropriately to feed the .F code.

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Ubuntu :: Where To Change C To F So It Reads USA Temp

Jul 9, 2010

I'm having little problem trying to change weather to USA it reads C instead of F on conky forecast here is screenshot.

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Ubuntu :: Copies Files 3/4 Of The Way Through And Reads?

May 23, 2011

My ubuntu started out right, it copies files 3/4 of the way through and reads ready when you areThe foward button does not let me click it

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Ubuntu Multimedia :: 10.04 VUmeter Reads Ok But Still No Audio

Aug 22, 2010

I used to have audio working. Now it's silence while the vumeter reads as if all streams are outputting okay. I have a Radeon HD 4670 with audio out the HDMI as well as audio out the motherboard simultaneously. This all works in windows 7 and used to work in ubuntu until some point, not exactly sure when, it all went silent. Also, fyi, I started with a clean 9.10 and upgraded to 10.04.

# uname -a
Linux turk-desktop 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28 05:14:15 UTC 2010 x86_64 GNU/Linux
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC888 Digital [ALC888 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0

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Ubuntu :: RAID6 Writing Faster Than It Reads

Dec 20, 2010

Ok first off the write speeds are off the hook, 210MB/s on 5400RMS disks (5 disks in a RAID 6). However, read speeds are 68MB/s. I wondering first off, why? and secondly could this be an indicator of something not properly setup that might cause harm to my disks?

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Ubuntu :: Reads Only One File On D Drive After 10.10 64 Bit Install

Dec 26, 2010

Due to crash of 10.04 grub, I installed it again from a live CD on D drive "C drive has windows 7", then immediately after install, I upgraded to 10.10 64 bit. Need to change the boot to Windows loader and not directly to Ubuntu as it happens now. I see "windows loader as an alternative option" and it works when I select it. when I boot to windows, my computer icon reads only one file on D drive "bootsqm.dat". from Ubuntu computer option, I can access all windows files.

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OpenSUSE Hardware :: DVD Reads / Does Not Write - Unspecified Error

Jan 11, 2011

Problem: MATSHITA DVD RAM UJ-851S ( rev 1.50) reads dvds and plays audio/movie (.avi,.mp4,mp3,etc) but refuses to burn.

Media: Taiyo Yuden DVD (always excellent!!)
Sony DVD+/-R (w/"AccuCore" technolgy; recent purchase 3 days ago)
Sony CR -R (previously flawless, at least for audio, doc backup)

Notebook: HP Pavilion dv9000 series (dv9310us)

Symptoms: 1. Reads all media
2. Starts burn w/acetoneiso, brasero, nerolinux 4.0.0;
3. Gets to 35% - 90% complete; then each app above reports:
"unspecified error.. .. .." or words to this effect, asks for log/bug report, etc.

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OpenSUSE Multimedia :: Amarok Reads Media But Does Not Play It / Fix It?

Nov 23, 2009

It isn't that I don't get sound. It just won't play. If I click a file, then click play it quickly goes through an amount of songs. Too quick to give a good number. For example, if I have 100 songs on my library, I want to play one. Obviously I click play and such to make it play but instead of playing it acts as if it can not read the file (even though all my songs are in the library). Got any help/tips/whatevers?

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Ubuntu Installation :: Sony Vaio Reads Only Original Cds?

Aug 14, 2010

i'm trying to install ubuntu on a sony vaio. Unfortunately i cannot boot from a cd on which i have burnt the .iso file of ubuntu. The only way i managed to install ubuntu was by creating a usb bootable stick, but here also that doesn't work so well. My workaround was to use virtual clone drive which is freeware to simulate a cd rom in windows and get the iso file started. By leaving the bootable usb stick in the computer in this way it worked...

So in the end i have grub and can load ubuntu and win xp, but then by trying to format the harddrive i kind of messed things up and had to reinstall windows. Because the DVD drive only reads original cds. So from there i will attemp to reinstall ubuntu again. But how can i get rid of win xp afterwards ? If that CD Rom would only read burnt cds or if it would habe been possible to boot from usb then i wouldn't have this trouble.

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Ubuntu Multimedia :: Which Gnome Part Reads Mp3 Librarys?

Feb 3, 2011

Maybe a simple question, im not sure what is running behind the curtain.


are doing the same thing with my 14k mp3 library. They all dupe exactly the same files with every full rescan of the existing music library. So i guess they all use a gnome system part for this job and there is a bug inside this part. I want to file a bug against this part but don't know the name.

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Hardware :: HP Printer Still Reads Ink Level Empty Even After Replacements

Jan 25, 2010

My father has an HP PSC 1510 All in One Printer - Scanner - Copier. I have recently managed to convert him over to Linux, his current distro of choice is Fedora 12.Everything was going surprisingly well until recently: the message came up on his screen saying that the ink levels were low. After replacing the cartridges the message continued to appear. However the main nuisance is that it will not allow the printer to print at all now.

The cartridges are working as he still has vista on his system and logged in and printed out from there without hassle. Is there a way to reset the memory of the printer in Fedora? I am not much help to him here as I know nothing about printers.

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Programming :: Bash Script That Reads Lines In While Loop

May 26, 2011

So I need to write a bash script that can read lines and column 3 from a file. It needs to start on line 16 and read every 20th line starting from there. But the value that it reads needs to be checked, should it be too great I need it to shut the program down.I'm pretty new to bash, but my ultimate goal is being able to safely run a program on a GPU for an extended period of time with out worrying about it overheating. I have a command that outputs information from the GPU every second, and I can save this to a file. So all I really need is something to read and check that file, I played around a bit with the awk command and can't get it to work within my for loop with dynamic variable.

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Slackware :: Mutt Reads Mail Spool Very Slowly

May 11, 2011

Running 13.37 with either the stock or from /testing and the stock mutt I am having to wait 3-8 seconds while mutt reads my mail spool. Hmmm on closer examination read speed is actually fine, pressing F5 to refresh shows the spool immediately. Some odd refresh problem, this with xfce.

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Ubuntu :: Samba Slow Writes To Server But Fast Reads

Jul 1, 2010

I have a fileserver running 10.04 server 64bit and samba. I connect it to my desktop which is 10.04 desktop 64bit.I have the server mounted on my desktop in fstab as:// /media/share cifs guest, uid= 1000.Up until 30 June 2010 it was all fine. Now when I write the server it is very slow e.g. 2Mbps though when I read I get >100Mbps so I think my network is still ok. If i use nautilus smb:// I can write at >100Mbps and also read at >100Mbps...So any ideas why the write speed via the fstab mount samba has started to go really slowly in the last couple of days?

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Programming :: Implement A Device That Is In Fact A Program That Reads From Other Devices?

Aug 1, 2010

you have to read from many devices separate devices and make it look like a single one. It sounds very much like a device driver to me, perhaps... but getting my hands dirty with kernel code sounds like a daunting task for me that I've never done it...

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Ubuntu Installation :: Install Through Terminal Always Reads That Theres No File Found Or Can't Complete?

Jan 23, 2010

i just installed ubuntu and i wanna put wine on so i can install my itunes and adapters an so on. but when i try to install through terminal it always reads that theres no file found or cant complete installation. and theres no net hooked up to it cuz the wireless adapter wont work.

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Server :: A Script To Shutdown A Service When A Sybase Table Reads Over A Certain Count?

Aug 3, 2009

Someone at work has requested if i can find out anything on the above.Been googling around as well as i have only been using Linux for 2 months now.

basically there is a SYBASE ASE installation on the server, which a tomcat based website references.They want the service to stop once a certain row limit is reached in the table.

I know i have to do a count statement on the sybase table from ISQL.But how can i create the action "service website stop" once the count value reaches 4000 ?

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CentOS 5 Hardware :: Determine IO Size During Reads And Writes To A Storage Device

Nov 19, 2009

Is there a way to determine the IO size that is being used for reads and writes to an attached storage device? I am trying to pattern the IO sequences to storage. I have seen mentions to max_sectors_kb but the notes indicated that changing this value did not change the IO size to the storage.

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Networking :: Bash Test Script Which Reads Lines From A File, Builds ISO Messages?

Mar 11, 2010

Here the description of the issue I am having.I am writing a bash test script which reads lines from a file, builds ISO messages, sends them to a server, reads the response with response code and reports the result of the test to a file or on the screen.The message that I need to send is 94 characters long.Here's the portion of a code that I initially wrote:

#~ Open socket.
exec 3<>/dev/tcp/
#~ Send msg.


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Software :: Distro With TTS Support - Keyboard Shortcut Reads Selected Text Aloud

Sep 17, 2010

Which linux distros are set up to allow me to type a keyboard shortcut to read selected text aloud? Or allows TTS to read from the clipboard, as long as it watches the clipboard and starts to read when clipboard is updated.

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Ubuntu :: Screen Reads 1.414518 Kernal Panic-not Syncing: Vfs: Unable To Mount Root Fs On Unknown - Block (8,2)

Mar 23, 2010

I've been using Ubuntu now for 4 years and apart from getting the wireless card working on this laptop it has worked perfectly until now. I just loaded the updates and now problems, after switching on and selecting Ubuntu the next screen gives options

2.6.31-20 generic
2.6.31-20 recovery mode
down to
2.6.31-16 generic

if I hit return or let 20 load the next screen reads 1.414518 Kernal panic-not syncing :vfs : unable to mount root fs on unknown - block (8,2) Caps light starts flashing and only way out is to power down. If I select 20 recovery I get a screen full of info and then caps light flashing and only way out is the power button, if I select 19 it loads and works as normal. Is there a simple way to get it auto loading again as the rest of the family use this and are now Ubuntu converts and will not realise whats going on and will reluctantly load up windows.......

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Ubuntu :: Get An Error Message That Reads "the Ext4 File System Creation In Partition #1 Of SCSI3 (0,0,0) (sda) Failed?

May 15, 2011

When reinstalling ubuntu 10.04, I get an error message that reads "the ext4 file system creation in partition #1 of SCSI3 (0,0,0) (sda) failled.

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Ubuntu :: Receiving A Notification Which Reads "ur Browser Has Been Updated And Needs To Be Restarted..."

Mar 16, 2010

I am receiving a notification which reads "ur browser has been updated and needs to be restarted". Its poping up again and again,am not able to stop it.

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