A filesystem is a way to organize and store computer files with their data.

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How to change relatime access time update interval from 24 hours?

According to the RHEL 6 documentation about the Relatime Drive Access Optimization: The kernel used in Red Hat Enterprise Linux 6 supports another alternative — relatime. Relatime maintains atime ...
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74 views

Why are block sizes limited by page size in Linux?

In many (all?) file systems that Linux uses, including ext2/3/4, the maximum block size is the page size of the architecture Linux is running on, ie. 4KiB on x86. Why is there this limit? Might this ...
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84 views

How does fsnotify setting affect system performance?

Occasionally a software package I install complains that the default fsnotify setting is far too low for decent performance. Intellij IDEA or crashplan are two examples. They suggest using fsnotify ...
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227 views

Aufs Whiteout removal

I'm using AUFS for merging 100+ branches for a project. At runtime, I frequently add or remove few branches. Now, If I have a branch named "firefox-21.0" and If I update/modify one of it's file then ...
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21 views

Defining Languages Available at boot - LiveCD

I am trying to create a refined version of the buggy uck for customizing Ubuntu LiveCD ISO, here it is if you're interested in helping. NOTE: The process is straight-forward, except when customizing ...
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40 views

how to migrate a squashfs system to another filesystem that's read/write

Well, basically what i want to do is copy all of my router's files (even the dev file (because i'm running busybox)) to my usb flash drive and let my router by default boot from the usb device. it ...
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66 views

How to restrict directory name creation to pattern?

I have FreeNas CIFS share. Mount command result: /dev/ufs/VSPHERE on /mnt/VSPHERE (ufs, NFS exported, local, soft-updates, nfsv4acls) I want to restrict users from creating directories that do not ...
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180 views

aufs with lower writable branch

I'm trying to hide some directories on a mounted file system (it's not about security, just aesthetics). I've mounted the file system regularly on /mnt/data and wanted to use aufs to overlay a ...
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745 views

find ount what [flush-8:0] is writing

Using iotop, I found out that [flush-8:0] is doing a lot of hard disk activity, which explains the annoying slowdowns. However, I can't figure out what's the actual cause behind this flushing. No ...
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106 views

Why does my Pandaboard boot partition need to be vfat, and the rootfs need to be ext3 or ext4?

While booting Android on a Pandaboard, I am partitioning the SD card into two partitions, boot and root. They contain different filesystems. Why does the boot partition need to be vfat, while the ...
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140 views

Can a FAT32 and NTFS file system exist without UUID?

I have an USB disk drive partioned with 2 FAT32 partitions, which is not getting detected in the embedded device, but gets detected in a Fedora system. Basically in the udev rules, I am not able to ...
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62 views

What are the differences between the current Linux kernel and the Unix SVR4 kernel in terms of device drivers+i/o and virtual files systems?

Yes I realize that Linux supports many more file systems and recognizes more devices than Unix SVR4. I'm interested in what the differences are in the abstraction on top of an actual file system, or ...
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223 views

Connected external HDD slows down system

I need to connect large external hard disks (with many many files) to a system running Ubuntu. I have no idea how the Linux kernel is treating the inodes for the external drives, but attaching huge ...
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8 views

Many transient files on journaled filesystem?

Writing and deleting many files quickly I'm going to write many temporary files per second, over a sustained period. Each will be deleted after some milliseconds. Say we have an image processing ...
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15 views

NFS Block Size Open File

If I open an NFS file for the first time, what exactly is it that gets "downloaded"? Is it just file metadata and subsequent client requests will request individual blocks? Is it the whole file, or ...
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41 views

changing /var in running system

I have the challenge that I cannot start a CentOS Linux server in single-user-mode, but I need to change the /var (currently part of /) to a new disk. My way would be: mount the new disk on a ...
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39 views

How to use Reiser4 on Debian Wheezy?

Is there an easy way to use Reiser4 on Debian Wheezy? I installed reiser4progs but obviously I need a patched Kernel as well to use it. Is there some semi-officially maintained kernel to install ...
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26 views

How can I unveal files on my external hard drive?

I copied a big folder (around 110 GB) from my (Mac 10.7.5) computer onto a hard drive (exFAT). It took quite some time and afterwards I even checked that the files were actually there. After more ...
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62 views

Cannot mount second 1TB harddrive in Linux, works fine in Windows 8.1

So I have this problem with my second hard-drive that I have been trying to fix for quite awhile now with no luck. I have searched around to try to find solutions to my problem but nothing seemed to ...
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102 views

Is there a way to access Google Drive spreadsheet?

I'm using Linux Mint 16 Cinnamon. I tried google-drive-ocamlfuse and grive, but both of them can't access spreadsheet. google-drive-ocamlfuse shows this error: Device or resource busy W hen it ...
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27 views

How is default readahead value determined

I have two different devices running XFS and the default readahead value set differs between the two disks. Why is that ? How is the default size computed ? Is it device dependent ? I might also add ...
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141 views

Replacing default initramfs with my own

I followed this article to develop my own sample intramfs.cpio Now I have to put this in my kernel and compile. The procedure that I follw for petlinux is that I first run petalinux-config (and ...
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63 views

Citrix XenServer, all packages appear to be 32bit

I'm hoping to use Citrix XenServer for a group of 4/5 machines. One of these machines has 18TB of storage (after RAID5 is taken into account). I've installed XenServer and mkfs.ext3 is the only ...
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141 views

How to use fslint (in particular findnl) on the command line to actually mimic the behavior of the fslint-gui?

So I am trying the fslint tools. However, the help included in those tools as well as the man page don't indicate that the cleanup actions offered by the fslint-gui are also available through fslint ...
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14 views

What forms of discretionary access control are there?

I know it's kind of an unguided question, but just so I have a broader sense of how things are I was interested in getting a reasonably complete list of discretionary access controls available on Unix ...
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110 views

How can i determine the block size of an vxfs filesystem?

I am looking for a way to see what the current blocksize of an filesystem is. Normaly i would use tune2fs -l | grep "Block size", but that doesn't work on vxfs. I googled a bit and found fstyp -v ...
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73 views

Optimization for an SSD?

I am running Fedora 20 on a Laptop ( Lenovo Ideapad Yoga 2 Pro ) with an SSD. My filesystem is LVM with ext4 as the format option. I am now running Fedora as the only OS on the system with Legacy BIOS ...
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1k views

kernel: “echo 0 > /proc/sys/kernel/hung_task_timeout_secs”

I got this errors in syslog. Any idea what does it mean? The system is running on Ubuntu 12.04, kernel: 3.8.0-35-generic #52~precise1 It looks to me like failure when trying to write to disk... ...
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139 views

How to blacklist bad blocks from a MD-raid + dm-crypt + ext4?

I have a ext4 partition, on top of a dm-crypt, on top of a MD-RAID 10. One partition (/dev/sdc1) dropped out of the array with a ton of read errors. I ran the manufacturer provided diagnostic tool ...
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868 views

Problem with openSUSE 12.3 dual-boot installation (with Windows 7)

I have a current Windows 7 64 bit installation that I'm using and I wish to create an openSUSE 12.3 partition on my HDD (not my SSD Windows drive). I used the Windows Disk Management tool to shrink my ...
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173 views

unionfs filesystem

I recently learned about unionfs and aufs and would like to put it to some real use. The scenario I have in mind is the following. Boot a machine with ubuntu on it which will serve as our base. Make ...
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128 views

How can I delete data from in a hexdump file from one offset to another?

I've created a disk image which was zeroed, formatted to ext4 file system, and then had several various files copied to it. I'm trying to extract these files using a combination of xxd and dd, but ...
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1k views

How to set up ZFS with ZIL and L2ARC SSD?

I have been considering bcache and flashcache. However my friend suggested me something called ZFS. In fact it says that formating disk with ZFS can actually do the exact same thing without kernel ...
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131 views

Directly convert Archbang live on a USB drive to one such with persistent file-system

I have installed Archbang 2012.12.03 from ISO image on my USB drive, now I have a USB drive with a live Linux installed on it but at end of every session and rebooting system I faced with a fresh ...
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118 views

Creating a Virtual filesystem to boot linux

I am trying to boot the linux kernel (bzImage) in QEMU but have had issues. After asking on U&L I found out that my problem was that I was booting the kernel without a filesystem to boot from. So ...
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256 views

Negative hdd usage. Available is larger than fullsize

Having issues with space accounting of lvm volume. 23G is available. But the full size of the partition is 20G. (So, it shows "-4.1G used" 0_O) > df -h Filesystem Size Used Avail Use% ...
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263 views

Unable to access Linux share from a Windows machine with NT_STATUS_BAD_NETWORK_NAME error

On the Linux machine I changed the smb.conf like this: [john] path = /root/john/downloads available = yes valid users = john read only = no browsable = yes public = yes writable = yes The path ...
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159 views

memtester runs faster after couple of runs

I am using this test tool : http://pyropus.ca/software/memtester/ And I noticed that first 3 iterations take 4 hours but 30 iterations take only 12 hours. I was hoping that 30 iterations will take 40 ...
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569 views

How can I determine how directories/filesystems have been mounted?

I have access to a VM which on a different network at work using NIS. (Debian by the way) This VM has about 10 extra /directories in / when I log in. They do not exist on that VM alone, they are ...
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72 views

How to access storage device related events with Zeitgeist?

I am trying to get my mind around Zeitgeist, using the Python DBus API. To get the latest accessed files and application is not so hard, here is what I do: #! /usr/bin/env python from ...
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2k views

/etc/fstab is mounting rw filesystem as read-only

A partition of my internal hard drive (not the root partition) I want to mount automatically on boot. I've been using /etc/fstab to mount my external backup drive automatically read-only, so this is ...
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38 views

mkfs.ext4: Discarding device blocks: failed - Input/output error

I am trying to format my new SD card, using following command; mkfs.ext4 -O ^has_journal /dev/mmcblk0p2 and I get following error: Discarding device blocks: failed - Input/output error I don't ...
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17 views

Files and Directories Dissappearing from Software Raid on Power Failure

I have a home samba file "server" (a raspberry pi) with two hard drives in a software raid 1, which have proven less reliable than any of my non-raid disks. I know there is a chance for data ...
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22 views

Cannot label F2FS (SELinux)

I'm running Arch Linux [testing] x86_64 For some reasons, I can't relabel my root file system (F2FS) with SELinux (custom kernel compiled, using refpolicy) Kernel ver $ uname -a ...
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58 views

Cannot mount fresh partition twice

I try to partition a harddrive with a script, where I have some trouble remounting the partition. This happens both this btrfs as well as with ext4. So I assume the problem is the partition table, and ...
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22 views

how to get filesystem creation time/date for vfat on linux

I want the date, when the filesystem on a usb stick was created. This would be the age of the stick in my case, since I have not recreated it. I have found how to do this for files and ext ...
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17 views

Prime New GlusterFS Cluster w/ 24GB of Files

I am attempting to load my new glusterfs cluster on AWS with my existing files that total in size of over 24GB. From my calculations, it is going to take 8 days to transfer all the files via the ...
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42 views

Beaglebone: Backup image mounts root as Read-only

After I had completed creating applications for my BB white (running ubuntu), I created a backup of the SD card using-> sudo dd if=/dev/disk2 of=/Volumes/BONE/bone_custom.img Recently, I tried to ...
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108 views

How to write to RAID 1 disks on Raspberry PI

I'm using Arch Linux on my Raspberry Pi, though I'm not sure that's relevant. I followed this tutorial to set up a RAID 1 array with 2 USB HDs. I then mounted the array (md0) in /media. What I ...
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20 views

Proper way to deploy my service on linux

I have a service that I wish to deploy on a Linux server. The service will be in the form of a number of executables that are started and stopped like a service using upstart of similar. Also, the ...