A file system (or filesystem) is a means to organize data expected to be retained after a program terminates by providing procedures to store, retrieve and update data, as well as manage the available space on the device(s) which contain it.

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How do I export my web-host's (VPS) filesystem to an image to load locally in a VM?

I'm a dev new to sysadmin, armed with root access to a linux box. I want to practice a bit on the configuration in a local virtual machine. What setup would I need to do this? My current idea is: ...
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Which is faster, and why: transferring several small files or few large files?

I soon will have a folder with thousands of files, each file on the order of a few KB. I will need to transfer these across a Windows network from one UNC share to another. In general, is it faster ...
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383 views

The impact of a high directory-to-file ratio on XFS

We're building a product that is likely to generate very large XFS volumes, and I'm trying to discover the scaling bottlenecks we're likely to run into given the architecture. As we manipulate files ...
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582 views

“No space left on device” error when writing certain session filenames

I have some filenames (session files) that can't be written ("No space left on device"). Other filenames (same directory) are fine. Disk is not full. The filesystem is ext3 PHP is giving an error ...
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Unable to list contents/remove directory (linux ext3)

System is CentOS5 x86_64, completely up to date. I've got a folder that can't be listed (ls just hangs, eating memory until it is killed). The directory size is nearly 500k: root@server ...
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Deleting blocked caused by thumb.db on Windows 2008 as a file server

I have a Windows Server 2008 which I am using to store media files. I am accessing this server via a mapped drive from my Win 7. Both are x64. When trying to delete folders, rename, move I get the ...
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5answers
685 views

Which filesystem would you use when you need to share data between linux and windows in dual-boot setup?

On my system i have windows 7 and ubuntu 10.04 installed. I need to share large amounts of data between both OS. My idea is to set up a partition which both system can access and exchange data. Any ...
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OpenFiler versus FreeNAS for Mac OSX environment

I'm a photographer and I have a requirement find a better method of storing my photo library. Currently I use a Macbook Pro and 6 external drives connected via USB2 or FW800. They are divided up in ...
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289 views

What filesystem comes closest to matching NTFS for support of ACLs, and highly-granular permissioning?

It seems that most other filesystems handle the basic *nix permissions (ugo±rwx), with maybe an addition here or there. Or can be "made" to handle ACLs through the use of other tools on top of ...
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2answers
653 views

Most suitable filesystem for virtualized Linux system?

Is there a clear winner in the filesystem area? As in, does some filesystem perform significantly better in a virtualized environment such as VMWare or VirtualBox? Is there more or less disk space ...
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1k views

File size mismatch

What's the reason behind the difference in reported file sizes? [root@localhost]# ls -lah sendlog -rw-rw-r-- 1 mail mail 1.3T Aug 15 17:30 sendlog [root@localhost]# du -m sendlog 24M sendlog This ...
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Advices for filesystem choice and tuning on SSD?

What is your favourite filesystem on SSD disks, and why? I'm asking because on my Acer Aspire One with 8 GB SSD with ReiserFS it takes ages to boot after an unclean shutdown, so I'm probably missing ...
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3answers
466 views

The use of external journals on SSDs

Certain journaled file-systems do suffer from performance penalties for hosting the journal on the same drive as the filesystem itself. Using an external journal can improve write speeds. With the ...
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4answers
2k views

What is the best filesystem for Maildir folders storage? [closed]

Projected volume size is around 1TB,. Filesystem should perform fast when dealing with LOTS of files in every folder. Snapshots support would be great, for backup purpose, but not compulsory. It ...
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3answers
954 views

EBS+RAID10+XFS slower than EBS+RAID10+EXT3 using MySQL?

We're currently using EC2 with 16 EBS volumes in RAID10 configuration for our MySQL data. I know some people don't recommend to put EBS volumes to RAID but that's not what I'm concerned about at the ...
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3answers
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Root file system is full and I need to install additional software.

I am trying to install to install EPEL Repository on CentOS 5.7. I still have lots of space available on my hard drive. /dev/sda2 3.9G 3.9G 0 100% / /dev/sda11 17G ...
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4answers
1k views

Filesystem permissions on Unix

If I have a folder specified as not-readable. Are all folders under it also non-readable? For example, my shared hosting home account directory is not accessible to other accounts, so, are all folders ...
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4answers
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UNIX/Linux sparse files — in use? How do you handle these?

Since the beginning the standard UNIX/Linux systems support sparse files, this is a file which contains unused space that is unallocated until needed. To review, to generate via a C program: create a ...
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Proper way to create a zfs off an existing directory?

Lets say I have an rpool with etc/ as a regular directory within it and now I want to create a separate zfs rpool/etc, obviously inheriting all the data I had in original /etc. What would be the most ...
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8answers
1k views

Allowing access to company files accross the internet

The premise I've been tasked with finding a solution to the following scenario: our main file server is a Linux machine. on the LAN, users simply access the files using SMB. each user has an ...
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4answers
898 views

Missing space on /var partition?

One of our server admins asked me to take a look at this, and I am stumped - our /var partition is full, however I cannot seem to determine where the space has gone. The following is the output of ...
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How to migrate a ZFS filesystem to use compression?

Question at the bottom. I have several ZFS file system I would like to use ZFS compression, but since enabling the compression will only affect new data written to the file system, I would like to ...
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4answers
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UNEXPECTED INCONSITENCY run fsck manually redhat

I erroneously restarted my server before completing a filesystem resize. Here's the command that ran successfully before restarting: lvresize -L -400GB /dev/mapper/vg_yavin-lv_home At boot, I get ...
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3answers
179 views

Appropriate network file system for huge (5+ Gb) files

I've got a number of servers used for HPC / cluster computing and I noticed that, given the fact that part of the computations they run use huge files over NFS, this causes significant bottlenecks. ...
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289 views

Synching 2 remote folders

We have 2 Drupal servers that read/write to their own copy of the same folder (the sites/default/files folder for those of you who know a bit about Drupal). Those 2 folders should be in sync. I've ...
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2answers
442 views

ZFS: Best-practices doc state: “On systems with 1,000s of ZFS file systems…”?

The docs state: "On systems with 1,000s of ZFS file systems, provision 1 GB of extra memory for every 10,000 mounted file systems including snapshots." What does that mean - how do these people use ...
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1answer
2k views

Trying to determine the correct number of XFS allocation groups for postgresql server on Linux

I am running a postgres 8.4.5 server on the linux 2.6.33.7 kernel on an 8 disk raid array with an LSI controller. Most of the tables are around 1GB or less. I know that XFS uses allocation groups ...
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2answers
935 views

What are the maximum number of files/directories allowed per directory in common Linux FS?

It is known that ext2/ext3 FS have a rather low limit of about 32k files/directories per directory. It looks like ReiserFS is limited in practice by the r5 hash function which allows about 1 200 000 ...
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1answer
200 views

Recover overwritten filesystem

I made an oopsie- insofar as a filesystem with important data was overwritten as an LVM volume. I never actually wrote any data to the disk though, only hosed enough of the partition table to mark it ...
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2answers
3k views

How to “align” a Linux file system with a SSD?

I'm interested in getting a dedicated server with a SSD, probably Corsair Force series CSSD-F120GB2-BRKT. It'll be an Linux server, most likely running XFS (but I'm open to other alternatives). ...
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2answers
295 views

Why is the total size of my files on Windows 7 more than total disk size?

I have a virtual machine with Windows 7 x64 quest OS. When I boot from PE OS CD and run file manager (Total Commander) I see that the total size of my files on virtual machine is more than total disk ...
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Force ID of user created by apt-get

Context: I'm automatically installing postgresql-9.1 on an Ubuntu server with apt-get. This creates the required postgres user. The Postgres data is on an external volume that survives reinstalls. ...
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60 views

Where the website files could be located?

As we know there are multiple locations such as : /var/www/vhosts /home/user When should we use each of the above (or other) locations? What is the difference between them?
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3answers
249 views

Avoid write on a mounted loopback device to be propagated

I have a device that mounts its root file system using NFS. On my NFS server I have a file representing the device's file system, namely target.ext2, which I mount on the appropriate /export ...
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3answers
166 views

Filesystem cache accessible via HTTP?

After searching the web for hours and couldn't find what I was looking for, I thought someone here might have an idea ;-) I'm looking for Linux a program that will cache in memory a designated ...
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how to low-level format a hard disk using AIX?

I have a server with AIX 6.1 , I formated some hdisks using diag tool, but in some way some of its VGDA survived. how may I low-level format a hard disk using AIX? or how may I clear the VGDA of a ...
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1answer
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The file system structure on the disk is corrupt and unusable - SBS2003

I'm getting the following error all the time on a clients SBS2003 box. The server is a Dell PowerEdge T300. I've run the Dell diagnostics on the SAS controller and both drives, and everything comes up ...
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792 views

Filesystems for webserver with SATA and Solid State disk,

We have just ordered a new webserver with 120 Gb solid state disk and a SATA disk. I am trying to plan ahead what sort of filesystem to use. This system will be running Linux, Apache/Tomcat to host ...
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File base permissions are 666, why and is this a configurable value? [closed]

It is specified in various documentation on the net that linux/unix file base permissions are 666 with regards to how umask manipulates. This is also relevant with regards to the fact that default ...