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

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sysv and unknown partition table?

We have disk about 1985, It has a Unix.But we didn't know type of Unix.I did the following step : dd if=/dev/sdc of./all_of_disk.iso #sdc is the given disk Then : hexdump -C all_of_disk.iso > ...
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How do I find out hard disk model and serial number in amazon machine?

when check in local machine /proc/scsi/scsi file it contains Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: ST3160215AS Rev: 3.AA Type: Direct-Access ...
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42 views

How to install a system on top of ZFS?

I have a clear system with 5 hard drives, bios. No OS installed, no formatting applied to hard drives. I want to install a Scientific linux (6.6 or higher) OS on top of ZFS on it. What are the ...
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95 views

Recovering files with directory structure

EDIT: I am using Debian 8.1.0 So I somehow deleted my /etc directory. While I have not been able to recover the complete /etc directory hierarchy with all files, I have received different parts from ...
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117 views

EXT4 Journaling - Problem

Basically my root (/) ext4 partition keeps being mounted as read-only when I apply internal journaling feature. I understand that this should be default, but today I had been trying to apply external ...
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31 views

How do I get new filesystem formats to use in mkfs?

I am currently attempting to run some benchmark tests using different filesystem formats. However, I can only use the ext family, cramfs, and msdos formats with mkfs since those are the only formats ...
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48 views

Ext3 Journaling Question on inode and disk layout

I was going through Journaling and JBD and wanted to ask you a very basic question for which I was not getting an answer: 1.Why Journal Inode number comes as 8 when we do ./dumpe2fs? 2.So far my ...
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73 views

Recursively lowercase, replace space and remove invalid characters on linux FS

I want to recursively run the following commands on a directory as part of a cron. The first line changes everything to lowercase, the second replaces spaces with _ and the third removes all invalid ...
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83 views

BTRFS - removing drive by devid instead of path

I recently lost a 5 TB drive using btrfs. I had a system freeze (unsure why) while a balance was running. My SMR drive got corrupted. I was able to mount my array degraded and balance my data. ...
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70 views

Difference between fsarchiver and dump

What is the difference between dump and fsarchiver? Are there features in dump which are not covered by fsarchiver? Can both backup to tape storage for example?
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32 views

Formatting btrfs for robust metadata

If I make three partitions on a HDD, it appears that the default (which is -m raid1) will only store two copies of each metadata block. Is there a way to store multiple copies, e.g. one on each ...
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176 views

find the cause of file corruption when copying files to a network share on an Ubuntu machine

I am copying files from my SD card to my Ubuntu server via Windows 7 using a network drive. The problem is that sometimes, 2 files out of 150, are corrupted during transfer. See here 2 example files ...
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44 views

shared filesystem with offline access

I would like a shared filesystem with offline access. I have two machines. One is a light laptop with a small amount of SSD storage that I carry with me. The other is a stay-at-home computer with much ...
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315 views

No space left on device, with 320 GB free

I'm a bit lost. I have a 500 GB external hard drive with its original filesystem still in place. The last command (dd writing to a file within this filesystem) failed with "no space left on device". ...
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161 views

fopen problem when mounting ecryptfs filesystem

After an unrecoverable fsck problem the mount of my encrypted /home/me filesystem isn't possible any more. The visible effects are: a) logging in though most of the selectable GUI window managers ...
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144 views

Home server bottleneck (filesystem server)

I am trying to set up a filesystem server, so that I can use my various laptops to transparently mount a directory containing many VirtualBox VMs, some of which run full graphics environments. I will ...
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160 views

Error file system check

I enabled the package e2fsprogs and always when the system starts it return the following error (when partition mounting): Jan 01 00:00:03 xxxx systemd[1]: Found device /dev/mmcblk0p3. Jan 01 ...
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218 views

Directory symlink to inode, not path (e.g. directory hardlinks)

I'm trying to better understand why directory hardlinks are not possible. Roughly, I think of directories and files as follows: directory --------- inode # exposed as . inode_of_parent # ...
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211 views

Loopback (bind) mount automatically mounting additional ext4 USB drive

I have a USB (ext4) drive connected and it's registered in /etc/fstab. It mounts at /media/Backup fine. I want to mount a specific directory on that drive using a bind / loopback mount (this is ...
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132 views

ZFS datasets attribute inheritance

I have a ZFS filesystem on a Solaris system. In one pool I have an ISCSI share and an NFS share. zfs list tank 1,01G 2,88G 24,0K /tank tank/nfs 24,0K 2,88G ...
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118 views

Mount success but property of device mapper that dmsetup create is lost

I tried to create device mapper with dmsetup as followed: dmsetup create error_disk 0 20000 linear /dev/loop0 0 20000 1 error 20001 20959 linear /dev/loop0 20001 Then I check with command below: ...
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157 views

File of Doom freezes any computer that attempts interaction

I have a file on an internal server that causes any machine that interacts with it to immediately and irrecoverably freeze. By interaction, I mean just about anything: rm, mv, cp, cat, vi, gedit, ...
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48 views

How can I make a read-only Linux system (which uses unionfs) read/write for the duration of upgrades?

Assuming having an embedded linux application, and for protection against corruption from example abrupt power offs, you implement a read only system with union fs. But then, how is it possible to ...
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Is it possible to make a symbolic link of a file in other machine?

I have a account in a server and I would like have a symbolic link of some files in my local machine. How can I do this?
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28 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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152 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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221 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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80 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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80 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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423 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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261 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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548 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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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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160 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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226 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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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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273 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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191 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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2k 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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184 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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147 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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533 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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297 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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225 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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95 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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How to set usb stick's ntfs filesystem's attribute to readonly in linux

I know how to set readonly attribute to ntfs filesystem of a usb device by using diskpart tool in windows. attributes disk set readonly but how to set readonly attribute to the same usb device ...
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KDE 5 plasma desktop slow filesystem operations

I have KDE 5 and Plasma Desktop, Kubuntu 15.10, and there is one annoying thing: file operations works very strange. If I'm removing some file first time until system was power on, KDE starting to ...
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mount directory cannot be seen from within apps

I have successfully mounted a local network location on my Android device to /sdcard/routersd with permission set drwxrwxrwx; I can successfully browse within this mounted directory and do copy/delete ...
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On-the-fly Textfile template engine

Is there a dynamic/on-the-fly textfile template engine that works on the filesystem level, e.g. via fuse, in a similar fashion to web-server html template engines? Imagine you have, e.g. a ...
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fsync () get the impact of road /proc/sys/vm/drop_caches?

I have been testing the service life of TLC(1000write) SD card (4GB). SD card has been formatted with a fat partition. I am a write (), fsync () on a file of 10M SD card repeatedly. 1st (10M): ...