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Questions tagged [io]

I/O refers to "Input/Output" generally being a synonym to Write/Read in terms of a file.

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42 views

Input/output errors when running some programs in Lubuntu started from a bootable flash drive

I downloaded Lubuntu 18.04 iso file into my flash drive and make the flash drive into a bootable device. I inserted the flash drive into a laptop (C55t-A) and booted into Lubuntu without actually ...
12
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4answers
1k views

How do I tell if a command is running or waiting for user input?

On command line, I typed a command and hit enter. It doesn't output anything . How do I tell if it's running and not yet output, or it's asking for user input?
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0answers
34 views

I/O Error - Ubuntu doesn’t boot (hardware or software issue?)

So this is my first entry at askubuntu if I miss something or this issue is at a wrong channel... I’m sorry in advance ;) I have an Dell XPS 13 with an 512gb NVME (bought Autumn 2018). Ubuntu 18.04 ...
2
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2answers
84 views

Compressing folder without using additional space on the drive

I have an 18GB EC2 instance that has run out of space. I wanted to zip and transfer files off the server to a local drive. There is just about 1% free space remaining on it. This means that I cannot ...
0
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0answers
26 views

Trying to access NTFS partition, getting I/O error

I dual boot ubuntu and Windows 8. Yesterday, after greeting me with a BSoD after waking, Windows committed suicide. It boots into a disk repair process and reboots, stuck in an endless loop. A ...
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0answers
57 views

How to use device mapper (dmsetup) for delay read/write. Error: “Device Or resource busy”

I wanted to simulate slow disk (disk latency) on my ubuntu 14. I have come across https://www.mjmwired.net/kernel/Documentation/device-mapper/delay.txt documentation which highlights adding delay with ...
0
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0answers
35 views

Rescuing flash drive, device disappears on read error, how to create byte copy

My flash disk is 16GB Kingston and this is part of the dmesg when mounted as /dev/sdc: usb 2-3: new SuperSpeed USB device number 126 using xhci_hcd usb 2-3: New USB device found, idVendor=0951, ...
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2answers
97 views

Does any open source I/O benchmarking tool support ramping up IOPS?

I know that I can use fio to benchmark my disks with any given static workload. However, does any open source high quality benchmarking tool support doing a test where I select following parameters as ...
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0answers
2k views

print_req_error: I/0 error

Every couple of days I get these errors that lockup the server. [501.882940] print_req_error: I/O error, dev fd0, sector 0 [504.338961] print_req_error: I/O error, dev fd0, sector 0 [504.738984] ...
0
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1answer
37 views

Does storage affect file caching in cp?

I read somewhere that cp uses file caching, but why does coping something the size of ~100MB result in a file cache of more than 100MB in ram? Does this also change if copying from HDD -> HDD,SSD -> ...
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0answers
7 views

I need help to log process details for every 5 minutes for each disk or media vise. can some one help?

Basically I need to have a logging enabled for disk wise information of processes which are utilizing that perticular disk at given point in time. and I want that log at single place. can some one ...
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0answers
174 views

call to iopl(3) ends with “Operation not permitted”, even when running as root

On older systems you could call a function int iopl(int level) with argument level=3 to get a permission to perform raw I/O operations. On Debian this still works, but on Ubuntu 18, it always returns -...
1
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2answers
179 views

Is my disk dead? I cannot boot! [duplicate]

I have an 8-year-old dual boot laptop, but it won't start Ubuntu or Windows. When selecting Ubuntu, I get a BusyBox, that mostly says: failed command: READ FPDMA QUEUED blk_update_request: I/O error, ...
0
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0answers
62 views

Multi SATA controller motherboard intermittent disk I/O errors (18.04)

The system's motherboard is an ASUS Z9PE D8-WS with 3 different SATA controllers, two of which are used: a PCH chip connected in this case to two SSDS (one of which is the system disk) and a Marvell ...
0
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0answers
13 views

18.04.1 gnome: While copying some files from my file server, my desktop went to sleep

shouldn't any IO operation prevent this from happening? If this is not automatic, how can I prevent this from happening again? From my experience with Windows 10 and OSX High Sierra, this shouldn't ...
0
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0answers
78 views

IO Port Address RJ11

I've 2 PCs running Ubuntu. The PCs are from different vendors. They have IO port interface via RJ11 connector. They are used for accessing the cash drawer. On one PC, I'm able to access the cash ...
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0answers
172 views

Why does my grub2 shows failure reading sector 0x0 from hd0

I had made some power settings before this happened. My MacBook air is not booting up. It chimes and flashes for 3 secs and then blacks out. If I do ls on grub2 it shows me this error : failure ...
1
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0answers
80 views

Missing disk IO stats at gnome-system-monitor

I'm using Ubuntu 18.04, just plain/default ext4 installation (updated/upgraded). I can see stats from command line with iostat. Like on gnome-system-monitor screenshot: system monitor only displays ...
0
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0answers
63 views

large amount of buffer_head problem

After a program for bioinformatics (written in java) is ended, memory leak occurs. These are a flow of the program (step 1 to 5 are repeated per each candidate sequence with 150 java threads): 0. ...
0
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0answers
95 views

disk i/o error on multiple disks after format failure

I have 2 3.5" WD20EARS disks. durring a format/wipe, there was a power failure and now i'm unable to access either disk. I would normally think that it's just a dead disk but since it happened on both,...
0
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0answers
65 views

External backup hard drives keeps dropping transfer rate by orders of magnitude

Using Ubuntu 16.04 on Dell Inspiron 7570 I have been trying to backup my home to an external USB 3.0 4TB Seagate drive. I bought 3 about a year ago, and only ever opened 1 for use. I have the same ...
10
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1answer
1k views

How to limit resource usage for a given process?

I have a process for an application which needs to run, but ends up using far too much IO usage for what it does. And really crashes my computer, making it impossible to do anything else whilst it is ...
0
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0answers
19 views

Changing From Absolute IO Performance to Relative?

I recall a method (From a post on Ubuntu performance) to decrease absolute throughput and increase relative throughput with regards to I/O activity. In other words, to prioritise many small I/O tasks ...
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0answers
42 views

Blkupdate request: ioerror, dev sda, sector 255372552, 10497736, 114437680

I have ran into infinite error lines on my pc, showing io error on sectors 255372552, 10497736, 114437680 I have tried to reconnect socket wires, no improvement has shown. Also run memtests but got ...
0
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0answers
235 views

Slow writes to harddrive, software or hardware problem?

I have a problem where my Ubuntu (17.10 right now, but it's been doing it for several releases) freezes when I write to my SSD disk, and I need to find out whether it's a software problem or if my SSD ...
15
votes
3answers
965 views

What does & mean exactly in output redirection?

I see stuff like command 1> out or with 2>&1 to redirect stderr, but sometimes I also see &> by itself, etc. What is the best way to understand & and what it means exactly?
0
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1answer
69 views

External harddisk problem

The question title is obviously not clear because I am not sure what is going on. I have a 1TB external HDD. I've always been using it on my old laptop. On my new laptop running Ubuntu Gnome 16.04 I ...
0
votes
2answers
1k views

Ubuntu 16.04.2 freezes after startup

I left Ubuntu a while ago after Ubuntu 16.04 came out and was totally unstable, and tried another distro, and couple days ago after I saw that Ubuntu 16.04.2 was released I thought that probably some ...
1
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0answers
32 views

Profiling boot-to-desktop I/O usage

I am experiencing slow performance for several minutes after logging in to Unity desktop, with all signs pointing to I/O bottlenecks being the culprit. The desktop is nearly unusable (e.g. gnome-...
0
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0answers
11 views

Can't get past the loading screen [duplicate]

After too many inode error and frequent freezing i tried to wipe the disk and reinstall ubuntu on my intel(r) core duo e7300...but when i did it. I got this error error attempt to read or write disk ...
3
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0answers
2k views

Buffer I/O error on dev sdc, logical block 0, async page read

The first error appeared when i had installed the program on my usb flash on windows. During the installation from unknown reason, there was an error, something like "error, please format your drive" ...
0
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0answers
127 views

/dev/sda: Input/output error [duplicate]

This morning my dual boot (ubuntu 16.04/Win10) Lenovo x230i laptop showed the GRUB2 menu on power up, then decided to hang dead. After reboot it behaves as if there is no bootable disk, even though it ...
3
votes
1answer
401 views

How to fix a constant IO error cause by a Non-Readable file? [duplicate]

So, Basically when I open my media drive, I get an annoying error message from nautilus 'IO Error Can't read 2 files (songs actually)' and same goes with the ls -l command. I believe the file ain't ...
1
vote
1answer
1k views

Identify the entries of xinput

Some of the entries of xinput are strange ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳...
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0answers
149 views

SSD based cache for Virtual machines

I have to complete an academic project on kvm+ssd. Topic is SSD based cache for Virtual machines. I think when guest operating system issues read call, it will goes through KVM and then to host OS. I ...
3
votes
1answer
664 views

A lot of io after boot/login: gnome-software --gapplication-service

I see with iotop that gnome-software --gapplication-service does a lot of io, which annoys me, since this makes my laptop nearly unusable. I see with ls -l /proc/PID/fd that there a lot of open files ...
0
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0answers
174 views

Blktrace pid doesn't match real process ID

I wan't to trace I/O block device requests using blktrace command. To make a simple I/O block request I used the command below. $ sudo dd if=/dev/sda bs=1k of=/dev/null count=1 iflag=direct & [1] ...
0
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0answers
218 views

black screen of death io page fault

I am getting a BSOD, noted the following events in /var/log/syslog Sep 20 22:18:59 MS-7694 dbus[983]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org....
2
votes
1answer
2k views

Failed install of ubuntu 16.04 & 15.10 with error message “following file did not match its source copy…”

I am helping my son run Ubuntu on an old Dell desktop (Inspiron 580; 3G86G : Module,Processor,I3-550,3.2,4, Clarkdale,580/S; J510R : Module,Hard Drive,1TB,7.2K PHAR-XLOB P325K : Module,Dual In-Line ...
2
votes
0answers
224 views

IOError: [Errno 29] Illegal seek Wavefile [closed]

Im trying to use wavebender library to create music and get data out of music. I get this error don't know how to solve this. from wavebender import * from itertools import * import sys def ncycles(...
1
vote
1answer
418 views

dconf-service extensive io (write) on any key press

Fresh Ubuntu 15.10 installation on my home server PC. I noticed that dconf-service performs constant file creation and writes (?) to config files in home dir of current user on any key press. iotop ...
0
votes
2answers
92 views

Operation on one disk overloads other disks

I'm using Ubuntu 15.04 with MD RAID1, LVM and LXC on top of them as a webserver. I have normal load average about 1-2, and all is working well until I perfrom any massive IO operation. The strange ...
8
votes
1answer
2k views

System locks up when disk I/O is saturated

When I do a large file transfer from my external USB3 hard drive to my internal hard drive (or vice versa), be it via Nautilus or via terminal, Ubuntu (Unity) will almost completely lock up. Things ...
8
votes
1answer
30k views

Is closing a file after having opened it with `open()` required in Python? [closed]

Regarding my previous question, I noticed that in both answers that used the open() function, there was no mention of closing the file. I've read that it's good practice to do so, but is there ...
17
votes
7answers
26k views

Poor IO performance - PCIe NVMe Samsung 950 pro

I just finished a hardware build expecting a big gain from the new NVMe drive. My prior performance was lower than expected (~3gb transferred), so I've replaced the motherboard/cpu/memory/hdd. While ...
-1
votes
1answer
90 views

What performances should I expect with USB3?

My PC has 24GB DDR3 RAM, i7-4770 (8 cores) and a number of USB3 ports. That local system RAID0 (md) has been showing good performances so far, 900 - 1000 MBps with dd if=/dev/zero of=./testdata bs=...
1
vote
1answer
930 views

Docker performance on ubuntu host 2x+ worse than OSX host

Ok, let's start over after a bunch of investigation. Here is what we know: Ubuntu host 15.04 on i7 3820 (quad 3.6) and Samsung 850 pro SSD 512gb SATA 6 $ docker info Containers: 2 Images: 101 ...
1
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1answer
254 views

What is mapping fiber channel upon install of 14.04?

We installed 14.04 that is connected to a fiber channel. I was expecting to wrestle with multipath to get the LUNs connected, but I noticed that I am mounted to the fiber channel right after install. ...
1
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0answers
370 views

What is causing this disk I/O spike?

I have a Raspberry Pi 2 with Ubuntu 14.04 installed and I'm experiencing a strange problem. I'm attempting to use sbuild to build a Debian package and everything works well enough for the first few ...
1
vote
1answer
1k views

Using dd to test Write speeds

I'm trying to check the write speed of different devices that I have using the following: dd bs=1M count=256 if=/dev/zero of=/path/to/device oflag=dsync I want an accurate reading of write speed and ...