A filesystem is a method of storing and organizing computer files and their data.

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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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21 views

How do I change the OS block size

I am using SUSE 11SP3 and formatted the devices with a block size of 4KB using mkfs.ext3. /sys/block/sda/queue/logical_block_size and /sys/block/sda/queue/physical_block_size show the OS is using 512 ...
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22 views

In Mac Os, what is .DS_store?

In each folder I find a hidden file called .DS_store? What is this exactly?
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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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297 views

Do files change while passing from ext2 to ext3 to ext4?

If one creates a file on an ext2 (or ext3 or ext4) partition, then moves from one partition to another, each formatted differently, does any part of that file change? Once returned to the original ...
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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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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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131 views

When did directories stop being readable as files?

I have the 1st edition of The Unix Programming Environment book. In chapter 2, the authors state that directories are readable as files, and mention some facts about the format of these files. They ...
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39 views

Create a file that's really a network port

I have a program running on a cluster, and the output of the program is written to a log file which I specify. However, instead of writing it to a file, I want to write it to a network port, so that ...
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29 views

zfs deduplication “low” ratio

In Solaris 11, in a pool named mypool I activated deduplication with zfs set dedup=on mypool Then I created two 100 MB file: file1 and its copy file1copy. Only their names are different: their ...
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28 views

RHEL Error message mounting luks crypted filesystem at boot

I am configuring a luks crypted file system to be mounted at boot time using RHEL 6.5 I did all the configuration from command line and tt worked but printed an error message after asking for ...
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60 views

How creating forcefsck file triggers file system check on reboot?

What is the significance of the file /forcefsck? I understand by creating this file the file system check is enforced during the next reboot. But how does this work?
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Command not found problem in Linux-Ubuntu terminal

My friend is having problem in trying to call make to compile an application which both me and a second friend have previously successfully compiled. The file uses a "linux-devkit" pack that possess ...
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Use mount options from /etc/fstab for autofs?

I am using autofs to automount some partitions that I had mounted based on fstab entries before. I expected that I can apply the mount options defined in /etc/fstab to be used as options for the ...
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1answer
43 views

NTFS drive not mounting in Debian

This drive has been working fine for a while, but I recall having had some slight trouble getting it mounted in the past. Anyway, it was disconnected from the machine for some time and when I ...
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1answer
26 views

How are files or chunks delimited on disk?

I'm trying to recover some lost files by grep-scanning a hard disk. (The OS is Darwin 11.4.2. The file system is HFS.) How can I determine where a file (or contiguous chunk thereof) begins and ends ...
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20 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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1answer
21 views

iozone runs fail with “No such file or directory” errors

I want to start using iozone to benchmark an aufs filesystem on a virtual machine on ubuntu. I tried following the manual to use relevant parameters, but I keep getting a weird error on most runs. I ...
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71 views

“inode_size (128) * inodes_count (0) too big for a filesystem with 0 blocks” while creating a file system

My partition table looks like this: Device Boot Start End Blocks Id System /dev/sda1 * 2048 32505855 16251904 83 Linux /dev/sda2 32505856 33554431 ...
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38 views

Repeated filesystems and mount points in df output

when I type df -h to see the storage of my system the following is the result root@kch-rsp:/home/pi# df -h Filesystem Size Used Avail Use% Mounted on rootfs 13G 2.4G 10G 20% / ...
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1answer
111 views

Why would a partition be in use by the system if it isn't mounted?

I've been migrating my system from btrfs to ext4 after running into performance issues with VMs. I have two hard drives in my laptop to work with. I've successfully moved my home partition, but the ...
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1answer
30 views

mv deleted my directory. Why?

I was trying to correct the spelling on a directory, issued a mv command, and the directory is now gone. I'd like to understand--specifically--what happened. Here's the command I ran: mv ...
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33 views

Why does df show Available 0 when 1K-blocks minus Used is greater than 0? [duplicate]

Why does it show 0 in the available column? [root@server log]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 4128448 4096484 0 100% / It's ...
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43 views

Check the filesystem format with BusyBox (stat -f and df -T do not work)

I am using latest BusyBox v1.22.1 in my target. I want to check the filesystem type using stat -f or df -T but busybox doesn't support such commands. busybox help shows stat command as supported but ...
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1answer
39 views

How to test Disk IO on VMs with iozone?

I want to test the disk IO performance like read, write, random read, random write and so on both in physical machine and VMs (with aufs file system). Also I want to test the throughput performance in ...
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38 views

How do you move files into the in-memory file system mounted at /dev/shm

Someone recently told me about /dev/shm. You all helped refine my understanding of what /dev/shm is What dev folder allows you tell the OS to cache something? The person who told me about /dev/shm ...
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129 views

Reading FreeBSD UFS formatted external drive in Mac OS X

I have an external USB drive with backup files formatted in FreeBSD's UFS file system. When I plug it into a computer running Mac OS X 10.9.4, I cannot read the drive's contents, and I don't have ...
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57 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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53 views

Is reading a file on UNIX faster than writing a file?

Sorry for the sheer simplicity of this question. A rather obtuse performance bottleneck has boiled down to this very small query. I have done some empirical analysis and I think I might be getting ...
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19 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 ...
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48 views

Why does the mountpoint of my root filesystem change?

When I look at the output of lsblk it will usually show: lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 298.1G 0 disk ├─sda1 8:1 0 1023M 0 part /boot └─sda2 8:2 0 ...
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38 views

how to access with Linux to the real block size info of a filesystem when it is mounted on nfs?

I have a Centos 6.5 and Solaris 5 machines. I'm trying to get the information about block size of a filesystem in the member f_frsize of statvfs. I tried first from Centos but when the filesystem is ...
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16 views

Multiple file systems on BeagleBone Black?

I'm trying to put together a BeagleBone Black using Debian on the EMMC, a separate MicroSD card and a flash USB disk (but could ostensibly be platter media on USB). My question, simply put: are there ...
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103 views

Determine if zfs is the actual filesystem [closed]

With Solaris 11 the default filesystem should be zfs, but following the official guide I obtained (with cat /etc/default/fs) LOCAL=ufs Is this an error? I thought that the same information was in ...
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1answer
23 views

why doesn't iozone generate output file?

I'm using iozone3 for tesing, on Xamin (an Debian-based OS). When I enter iozone command, for example iozone -Rab output.xls, the test runs successfully. But after running the test (after displaying ...
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92 views

harddisk not recognized / filesystem too large to mount safely on this system / hdparm shows garbage

I have a 4 TB Verbatim external hard disk with ext4. It can be successfully mounted at my Raspberry Pi. I am trying to plug it at my WD Mybook Live Duo device where I have SSH root access. When I ...
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47 views

How to copy to a formatted image without root privileges?

I have formatted an image file using the mkfs command, and I would now like to copy files to that image file without root privileges. I have already tried to mount the image to a local directory, ...
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25 views

Regarding identical copies of gedit files

When ever I save a gedit file in a directory, two copies of it get saved with identical content. Ex: If the gedit file is named as file_name and saved in Home directory then when u ls the Home ...
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51 views

Avoid infinite loops in file operations

In many programs, such as in this example filezilla, when I go to use certain directories they get stuck in an infinite loop. So I might be uploading a folder to an FTP server, but this folder links ...
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147 views

monitor file permission changes

How can I figure out which process is changing the permissions of a file? on a Debian server, I have the problem that something is changing the permissions on /dev/null every day at 6:20 (since 3 ...
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102 views

How to format a 1GB USB stick to FAT32 with 512 bytes sector?

I am trying hard to format a 1GB USB stick so that I can use it to install a new linux OS. Because the Disk utility has failed me when creating the file system. I tried to do it manually using fdisk ...
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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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59 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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90 views

mount info for current directory

I can do df . to get some of the info on the mount that the current directory is in, and I can get all the info I want from mount, but get to much info. I can grep it down, but am wondering if there ...
2
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1answer
26 views

Installing a new OpenBSD kernel “safely”: why does `make install` go through these extra hoops?

After building a new OpenBSD kernel, the install target of the kernel Makefile does the following: rm -f /obsd ln /bsd /obsd cp bsd /nbsd mv /nbsd /bsd I understand that the first two lines remove ...
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Can the Operating System access a particular filesystem after it has been unmounted?

I have mounted a filesystem at a particular directory and I replace a file present in the filesystem.I now unmount the filesystem. Is there any possibility of Operating system accessing the replaced ...
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Proper file system for an External Hard Drive to work well on Linux [duplicate]

I have a External Hard Drive (EHD) I want to use to backup the data on my Linux laptop. I want to know how I should format my EHD for it to work correctly with Linux. Thanks.
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87 views

ext4 filesystems frequently corrupting

We have occasional power outages in our environment which seems to cause data corruption on our Ubuntu machines with ext4 filesystems. To my understanding ext4's default is to use data=ordered ...
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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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63 views

NFS mounting wrong File System

I have followed this How To ( https://help.ubuntu.com/community/SettingUpNFSHowTo ). My machine has a file system 30GB and other File System of 1TB mounted on /backup As this How To says to create a ...