IO or I/O is a common shorthand for referring to Input and Output

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bash: $'\302\211[COMMAND]': command not found

I've used bash in xterm on Debian Jessie for about 2 years. Just recently I sometimes get an error bash: $'\302\211[COMMAND]': command not found. The only help I can find on the topic is Piping grep ...
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Follow up, extreme sluggishness on machine doing IO

This is a follow up to a previous question. After more investigation it appears that I have a slightly different problem, whenever I do any volume of disk based activity like copying files or backing ...
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12 views

top equivalent to show I/O per process (per second) on mac/osx

Is there a top-like (visual) tool which can show per process disk I/O (kb/sec)? The question was already asked at Monitor disk activity, á la top, or nettop (per process) on a Mac? and What'...
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42 views

Ubuntu not recognizing external hard drive

I have 2TB Wester Digital external hard drive. I connected it to USB 3.0 port on my laptop with Ubuntu 14.04 (64 bit) installed. It was working fine till yesterday (Haven't tried on any other OS). ...
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44 views

Are Kernels hardware specific?

From my understanding, the Kernel provides the link between software and hardware, and therefore the Kernel must direct system calls being made by OS applications, correct? So would different I/O ...
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34 views

high priority for I/O operations

I came across this: http://linux.die.net/man/1/ionice however, it seems that it is not working on os x, as i got message that command not found. is there any alternative to it or way to install ...
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23 views

provide mp4 file as camera input

Is it possible to have a pre-recorded video on a external storage unit and connect the storage unit as a camera and stream the pre-recorded video as output from the storage unit?
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131 views

Is there a way to limit buffer cache size in linux?

I've got program consuming a lot of memory during I/O operations, which is a side effect of performing loads of them. When I run program using direct_io the memory issue is gone but time it takes for ...
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19 views

What does it mean in iotop when IO % adds up to over 100?

I've got iotop running and I'm curious what it means when several processes are all using a lot of disk io which totals to over 100%. If it matters/helps answer the question, I'm using a Google ...
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1answer
16 views

Python logging output limited to ~65 lines

I am working on a simple python script on CentOS 7. There is an error, but I am trying to figure it out using the log. I have a logging class that has the following logging levels: Error Warn Degub ...
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18 views

Benchmarking with Bonnie++

I need some help in interpreting this Bonnie++ results. These are the results from two VMs with Ubuntu 14.04 with identical hardware resources. One is running apache web server, other is running MySQL....
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24 views

Windows IO manager similar to virtual file system in Linux

This is a homework clarification question. I am working on a series of papers for an operating systems class right now and was asked to write a paper about how Linux and Windows differ on the topic of ...
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26 views

why does asynchronous I/O require buffering?

I read in some introductory lecture notes on I/O and operating systems that "asynchronous systems require buffering". Why is it so please? Cheers
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17 views

java.exe heavy reading of symantec virus definition

I've noticed that a java application (IBM Webpsphere) is running slower than it used to be and doing a lot of IO. When I opened process monitor I saw a weird behavior: it was reading Symantec virus ...
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11 views

Tool to connect to a file descriptor for I/O

I'm looking for a unix tool which can connect me to a specific file descriptor and do some I/O operations on it, assuming that the user permissions are valid. What could I look to use?
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49 views

Is there a way to get real time stdout and stderr from a process spawned by psexec on the same streams (pipes) as psexec

My question is very close to this question here with an additional constraint related to time-outs I'm using Jenkins to start some automated testing and then to capture the stdout (and stderr) of the ...
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1answer
14 views

Linux redirection pipe

I was testing out a kind of backwards indirection and came across this. I'm not specifying the desired behavior as there is none - I just want to understand the results - a sym link to an (unnamed?) ...
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49 views

Debian freezes while intense SSD I/O

I bought an SSD drive (Kingston SSDNow) and installed Debian 8 on it; The system works fine. But today I'm tried to extract a huge tar archive (~8GB) and in the middle of extraction the system just ...
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236 views

Input/output error when reading disk

I did a forced shutdown after my computer froze (on Ubuntu). After turning back on I found a "attempt to read or write outside of disk hd0" error, after choosing Ubuntu on GRUB. I haven then booted ...
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104 views

How can I retrieve data from a SD Card when photorec doesn't work?

A friend of mine took pictures of a Halloween party with his camera, and when he put the SD card in his computer, some of the pictures went missing. Knowing that I have successfully rescued his HD ...
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248 views

How to monitor which files lots of data is being written to on Linux?

I can monitor I/O with tools such as iotop. It allows me to identify which processes do how much I/O. Now I'd like to know which files those processes write all that data to. How would I do that? E....
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25 views

High IO on everything?

I have a Linux laptop with 4 GB of RAM and an i5 processor. Most of the time only Firefox and Thunderbird are open and of the 4 GB of RAM about 2.5GB are used and 1GB is 'cache'. Now, whenever I try ...
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48 views

How can I process traffic between 2 instances of NetCat?

I have an utility that make some data transformation between stdin and stdout in both directions (encode / decode), and I want to make a some kind of bi-directional proxy using two nc instances and ...
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1answer
46 views

How to check what is causing performance issue

I have inherited a server with some performance issues. It is running node js, nginx, basic MEAN stack. (DB on another server though) Whenever I copied a file (log file with size of around 150MB) or ...
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2answers
59 views

Force a process in Windows 7 to store capture in RAM without doing actual I/O operation and writing to the disk

I'm Using Wireshark's cyclic buffers configuration capturing mode: I am sniffing a 10Gig port, and I was expecting Wireshark to work cyclically with buffers on the DDR only, but apparently it doesn'...
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50 views

What does “losing a second of transactions” mean in MySQL?

Setup: Homeserver with Owncloud using MySQL as database. Problem: I/O on server HDD slows sync down to several days per 70k small files. Solution: ...or at least a workaround that I found is to ...
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285 views

I/O error new SSD w/ Windows 7

I searched around for this scenario, but couldn't seem to come across anything. I just bought a new 240gb SanDisk SSD, because my 128gb OCZ SSD died on me. I threw the new drive in, plopped a copy of ...
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76 views

How to catch hdd io killer process?

Sometimes my hdd on desktop PC starts work like crazy, then, in a short time all system starts to freeze, cursor barely moving, and then completely freezes, but hdd keep working non-stop. I have no ...
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5k views

SVCHOST.EXE (LocalSystemNetworkRestricted) is using almost 100% disk usage?

I'm not running any other program, only Task Manager and Resource Monitor. It made my machine heavily non-responsive, even cursor sometimes jumps here and there and it's not accepting any keyboard ...
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74 views

Would frequently reinstalling Linux distros affect the life of my hard disk?

I have Ubuntu and Fedora Linux distributions on my computer. I try to tweak many things in both of them and many times mess things up. So I normally reinstall the OS to fix it (as a last resort). In ...
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53 views

How to reduce I/O operations to a flash drive?

Background I often use different computers, and for that reason I like to aways keep with me a flash drive with my home directory, with my bash aliases and helpful functions, vimrc, Homebrew ...
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37 views

Bourne shell: how to add prefix string to stderr message?

I'm running a script on a Bourne shell, eg not bash (actually the sh from BusyBox 1.23.2). As asked & answered in this question, I'd like to "catch" error messages issued by commands within my ...
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98 views

Is I/O error sufficient reason to return SSD on warranty?

Several times I’ve encountered heavy disk errors leading to complete system crash, after reboot m/b doesn’t detect SSD till full PC poweroff. Here is log I've managed to display before OS gone ...
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114 views

Why is my System process doing disk IO?

Sometimes I want to see how much of my resources a program is actually using. But it seems that, often, even though the process is doing a lot it's for example hardly not doing any disk IO at all. The ...
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Determining average i/o file size on my computer

I'd like to see what the average data size is that my computer reads and writes to the hard drive. Many of the SSD benchmarks assume a 4K block of data, but what is my workload averages 16K? How ...
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41k views

diagnosing 100 percent disk usage in windows 10

Since updating to win 10, I'm experiencing issues with my disk usage. From time to time (sometimes every 10 minutes, sometimes once every few hours) my system becomes unresponsive because the disk ...
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147 views

Consistent 100% disk access

I am a developer and on my work laptop it is entirely normal for my disk activity as shown by Task Manager to be 100%. With an average response between 7k-10k ms. This is under relatively simple ...
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How can I use a Mirrorbow USB25IO board with a MacBook Pro?

I found an IO board in my closet, and I would like to use it with my MacBook pro. The text on the board is "Mirrorbow Electronics USB IO V1.2" I found this link to a manual: http://homepage....
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149 views

Btrfs I/O errors - crappy disks or btrfs fault?

I'm using btrfs for quite a long time, but I wasn't using any more advanced features before. Recently I've moved to btrfs on all drives, on all machines, turned on snapshots, raid and all the cool ...
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48 views

How to remove directory with error input i/o devive on hard disk

I have a hard disk with an error i/o. This is caused in a folder which I needed to delete in order to restore things. But deleting the folder gives the error. How can I force to delete this folder? ...
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201 views

Fail device in md RAID when ATA stops responding

I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr. The command sudo mdadm ...
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Diagnosing disk i/o errors, failing disk controllers

My PC has been constantly crashing with disk i/o errors recently and I'm trying to diagnose what the cause is before I order any new parts. I have windows 7 installed on a ssd (with truecrypt) and I ...
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205 views

VirtualBox: How much disk i/o speed gain will I gain if I have fixed-size hdd image?

I am running virtualbox on win7 with a dynamically allocated hard disk image. It seems to consume a lot of CPU and be slow on hdd activity. I've heard that not choosing a dynamically sized virtual ...
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Multiple interaction controls on a single computer

I wonder if there is a way to interact with a single computer using two interaction controls.For example,two people must be able to interact with two different application simultaneously on the same ...
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1answer
378 views

What would cause a high `%wa` value when there is nothing performing heavy io?

I have a 92.3%wa value on top right now under linux and when I run iotop -a, I see nothing causing heavy io. What might be the cause of the large %wa value and how can I go about diagnosing this? The ...
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157 views

Plot the data collected by sar in ASCII

isag in an "Interactive System Activity Grapher" that "displays the system activity data stored in a binary data file by a previous sar". How do I view the data stored by sar in ASCII on a Linux ...
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Does LSF io index report NFS io?

We use SONAS for our filesystem on our cluster and I have noticed that the load on SONAS does not necessarily correlate with the value of io on the cluster nodes when I run lsload -l. Is it possible ...
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How best to iron out disk I/O lag cause?

Running luksCrypt (which I know causes some lag esp. with my -c serpent-xts-plain64 -s 512 -h whirlpool setup) but as of late lag has become very much more noticeable. I use xfs and lvm on this ...
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45 views

How do i suppress a ssh-add passphrase prompt?

Whenever i run ssh-add in cmd it outputs a passphrase prompt. ssh-add "%~%\.ssh\id_rsa" Enter passphrase for C:\Users\Kristian Welsh\.ssh\id_rsa: I would like to suppress this text to add my own, ...
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Does an IO port address belong to RAM?

I have been using Linux (Ubuntu). To communicate with IO devices, IO port addresses are used. For example, 0x378 is an address for a parallel port. Is an IO port address an actual RAM address? If it'...