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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157 views

Move, and split up, 5TB of data

Here is the scenario: I have 5 TB (yes, that's a T) of files on a Windows server that I need to migrate to a new server in as short and efficient time as possible. (Think: Robocopy, Rsync, etc as I ...
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42 views

what exactly does fsck do under the covers (for UFS)?

If a computer crashes then the filesystem is an inconsistent state. What exactly is fsck(8) doing to restore to a usable filesystem? Is there a backup table? Is it cross-checking metadata? ...
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177 views

How to organize millions of static files to serve efficiently over the web?

I'd like to create a service to serve several hundred thousand smaller files (from 5kb to 500kb, mostly around 10-100kb). Think of it as a kind of gravatar.com which serves those little avatar pics on ...
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182 views

Choice of distributed filesystem for intensive reads and writes

I have a series of servers (HP ProLiant, 34 servers) each of which with 500 G of hard drive space. These servers are part of a computational cluster which runs processes that roughly fall into two ...
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172 views

Why can't a GPT partitioned disk on SATA be read on USB?

If I GPT partition a 4TB disk when it is connected to SATA, then it works fine. If I take the disk and put in the an USB3 enclosure, then I get [root@localhost liveuser]# sfdisk /dev/sdb sfdisk: ...
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62 views

“Hot data” and erasure coding: how to know if it is efficiently handled?

It is well known that erasure coding adds extra complexity because of encoding and decoding operations. Due to this drawback, most of cloud services recommend to use data replication for hot data and ...
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42 views

Filesystem on a block device that now has another name?

Here's the scenario: I'm attaching a disk to a KVM guest VM, lets say 'vdb' Now I create a partition on 'vdb' and format it as ext4 (vdb1) I mount 'vdb1' and write some data I unmount the 'vdb1' I ...
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64 views

Using Volume Shadow Copy to Identify Updated Files

I have folders in my server with over 60GBs of data across ~160,000+ files. The files in this folder change regularly. I need to be able to make a backup copy of the files in this folder at a given ...
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110 views

IIS 7 - Windows Server 2008 combine to make file locked, causing IIS to overload

I have this issue where approximately once a year, one of my images in my asp.net web app becomes locked. By locked I mean you can't read/write/delete it, and if you try to, your remote machine ...
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123 views

In linux and solaris, what is the UUID based off of?

If you run dmidecode|grep UUID you are given a "globally unique string of characters" which can be used for licensing purposes. In linux, the format is usually something like this: ...
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401 views

How can I repair dir total-size with gluster self-heal

I build a glusterfs cluster, and the type is the Striped Replicated Volumes with 4 servers like that: Volume Name: test-volume Type: Striped-Replicate Volume ID: bdb596e6-a7d2-44a4-8791-1b4fdc57469c ...
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70 views

Does exists a tool for monitoring which files changes?

does exists a tool to monitor how many, and which files are changed day by day ? I would like to 'monitor' how many Mbyte /Gbyte of data changes in my company file server day by day for a 'remote' ...
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119 views

Better folder structure for 1-6mil files?

I'm doing a bit of development work for a start up, and have been asked to work on the directory structure for all the content being served and the scalability of the host servers(load balancing, ...
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739 views

Recommended technology for layered disk cache in linux

I originally asked this on superuser but it occurs to me it's more more of a server topic. I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and ...
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37 views

Rename NTFS file to eliminate multiple periods via batch

I at wits end trying to rename NTFS files that have technically legal, but problematic multiple periods in my Windows 2012 Server share Files are dropped in a share that look like this: ...
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65 views

MongoDB: insert operation fails but disk is free

I've seen the strange behavior of my server and first of all I looked at log file /var/log/mongodb/mongodb.log. There I saw the next lines: Wed Jan 7 16:33:31 [FileAllocator] allocating new datafile ...
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162 views

Excessive disk usage with virtfs / cpanel

I'm running a server using cPanel, with virtfs enabled, and seeing very high disk usage compared to the amount of data actually uploaded/created by each user. I am getting DISKWARN emails telling my ...
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34 views

Analysing root cause of file system errors in Debian

My VPS hosting provider just helped me to restart my Debian VPS after it failed to reboot. He told me there were file system errors but told me to refer to the logs in order to find out what happened. ...
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75 views

Mount a iscsi target volume natively

I have a LVM logic volumn exported though iscsi and formatted by the client to ext4. Now that machine serving the iscsi target went down and I'm wondering if I can just take the hard disk out to ...
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416 views

DRBD keeps crashing over saturated link

Under high I/O DRBD will crash and take server down; is there anyway to optimize DRBD to prevent from happening again. listed below is my current config, errors and specs. if you need any more ...
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58 views

Speeding up directory creation / file linking

I'm using rsnapshot for backups. Currently that means every time an update runs (even without any data difference) I get a copy of ~100M of only the directory structure + inode list. The files are ...
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770 views

Create variable sized RAM-backed file systems (Ext4 and Btrfs)

For benchmarking purposes I need to format and mount variable sized ram-backed block devices with Ext4 and Btrfs. Unfortunately the only solution I have come across uses ramdisks which seem to be ...
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549 views

Iozone record sizes and real-life purpose

I am puzzled about Iozone record sizes. My questions are: how to find out what record size my application uses?; what is the correlation between Iozone record size and the filesystem Block Size?; ...
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341 views

ASP.NET, reaching the limits of DFSR, and file storage sharding

We run a popular web app, and our backend file storage exists on a file server, replicated to another file server for failover with DFSR. We are reaching the theoretical limits of DFSR, and therefore ...
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223 views

Linux RAMDisk filesystem with blocking writes when filesystem is full

I need to set up a Linux RAMDisk to implement a queue. The basic idea is there will be processes writing to the RAMDisk. At the same time there are processes that watch for new files and read and ...
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520 views

GlusterFS as elastic file storage?

Is there any way to run GlusterFS in a replicated mode, but with the ability to dynamically scale the volume up and down? Say you have 3 servers all running glusterd. your Gluster volume would have ...
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162 views

Erratic write patterns with linux md RAID1

I'm experiencing strange write performance patterns on a RAID1 array of SATA disks. My kernel is vanilla 2.6.37 and my server has 32G RAM. I'm copying a 32G file from an XFS filesystem on a SAS drive ...
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654 views

Why does this loopback device creation malfunction?

The stackoverflow people thought this was more appropriate here, I put it there as it is part of a program but I can see their POV, so here it is: At the bottom of the code you can see it failing. In ...
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21 views

Hardware Raid6 - Which FS and mountoptions + basic questions

I've got a new system (Ubuntu 14.04 on an SSD), including 2*Megaraid 9271-8i controller+cachecade & BBU connected to the backplanes of the case. Each controller has 8 WD RED 3TB (4096 Physical ...
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72 views

Is it possible to force a specific program to use virtual memory?

Let say I have 1GB RAM Ubuntu, I need to run both memcached and redis on the same machine The usage of memcached is quite heavy (e.g. 1K read per second) and redis is less heavy (but still 10 read ...
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71 views

Storage Spaces: Will removing a used USB 3.0 retain the data in a 2-way mirror setup?

So I've just realized that the ReFS filesystem, although promising in a Storage Space solution, doesn't have certain NTFS features that I need. So I'm contemplating going back to NTFS. Problem is ...
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124 views

How to find out file path of file on a network share drive?

I am using a small .NET application which integrates a file into another application, however, I keep getting the following error in EventViewer (part of the .NET application): "The specified path, ...
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102 views

OpenBSD automatic filesystem check at reboot

I want my openbsd server to boot, no matter what and dont break with waiting for manual FSCKing. It's easy to do in linux, but in obsd it just doesnt want to be "auto". Last time I set the 6th,7th ...
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152 views

Some users unable to see files that others can see

I have a file server running on Windows Server 2008 R2 in our domain that houses files created by an application and then moved to a folder available as a share to some users here. Users who use this ...
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32 views

Can I repair a file system with fscheck while it's mounted?

On a openvz hostnode some vps didn't shut down properly. There is no separate partition for /vz, they run in root. When restarting a vps OR copying a big file vz-dump (ca. 28GB) from one folder to ...
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22 views

Process being kept open “some where”

I've got an instance of the following error. The file is an outlook .pst file the has become corrupt, I'd like to move the file to another location and run the inbox repair tool. I have shut down ...
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38 views

Determine filesystem type without partition table

I have an old 16GB SCSI hard drive with some important files I'd like to backup. The problem is cfdisk doesn't recognize the hard drive, it says the partition table is zero. Another problem is, I ...
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91 views

Fedora install in Virtualbox expands to fill drive

I recently completed a Fedora 19 install on an 8GB virtual drive in VirtualBox. For some reason though, it appears as though I have run out of space! Surely my 951MB Fedora .iso can't have expanded ...
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346 views

Cant remove linux ln hard links

I am using CentOS 6.3 and am logged in a root. When I create a hard link by doing this: ln /root.hdd /somedir/root.hdd That works fine, the inode shows the same between the two files and ...
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188 views

PXE server - ubuntu setting username/password later - is it possible?

so I am writing a program in mainly C/C++, though I think this question fits under server fault as it is related to the Linux distro Ubuntu. So what I am looking for is a way (possibly hackerish-way) ...
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121 views

Final move of data after synchronising folders

I am migrating six terabytes of data from legacy systems to new. The legacy data is stored in file vault application which retrieves files very slowly. Because of this it took six weeks to copy the ...
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1answer
96 views

Mounting ISO9660 File System in Windows 2008

I am booting Windows 2008 instances in an OpenStack environment. OpenStack can use a "config drive" to pass metadata information to the instances. This drive is formatted as a ISO9660 (or optionally ...
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1answer
113 views

Open File dialog shows a renamed folder

I recently renamed a directory in the "My Pictures" folder from "ghostAlbum" to "imageAlbum" Explorer shows what I would expect (the new folder) as does the command line "dir" command. Excel's and ...
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1answer
149 views

strange usb file system corruption

We have a few X7DBT Supermicro motherboards that is using a Kingston DataTraveler 102 USB Flash Drive as a boot drive. The customer had 10 systems and they say that the site had a power failure. Once ...
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28 views

SQL Server plus small files

I have a MSSQL server, 3 volumes, that runs some processes that seem to take way too long. One of these processes reads in a zip file, then writes to a database based on what's in the zip file.... for ...
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736 views

What cause high CPU usage on the server during file upload

When I try to upload a huge file size (approx 2GB), the server cpu usage goes really high. What should I do to fix this? I just use standard html form and php, for file upload. I'm sorry if I post ...
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719 views

PureFTPd - is it possible to limit file access for virtual users?

I have a website for a little group of people, where each of them can login using their username and password. Since we'd like to share some files, I am looking for a FTP server, which would allow ...
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466 views

Does uwsgi workers share a common memory ? [ With Nginx ]

I have configured my Nginx with Django uwsgi. When the django server starts, it reads a 5MB file from the hard-disk. Now, Without Nginx with Django default server python manage.py runserver => Runs ...
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452 views

No init found. Try passing init= bootarg. ( linux fedora 14 - rackspace )

I have a server on Rackspace. It was working just fine. But this morning I found that it wasn't working, after a hard reboot (suggested by a rackspace chat support guy). I found that it was giving ...
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347 views

/dev/root not found at the time of booting Cent OS 5.7

Initially I got the error /dev/root not found while booting Cent OS 5.7. I knew the issue at it was because of wrong entry in /etc/fstab which was /dev/VolGroup00/LogVol00 / ext3 defaults 1 1 Here ...