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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Is there any way to fix a corrupted LDM database?

TL;DR: Are there any tools/approaches to diagnosing and fixing LDM (Logical Disk Manager) metadata structures without recreating from scratch? Full description: I have two SSD drives ...
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489 views

User permissions/feature limitations of the native zfs smbshare service on linux

I'm using zfs on linux, using the sharesmb=on option to try out the native smb share feature instead of adding the zfs tank path to my smb.conf file. The share has shown up on my windows machines, ...
3
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405 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 ...
3
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1answer
53 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? ...
3
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337 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 ...
2
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49 views

What does sunit=0 and swidth=0 mean for XFS file system?

I created an XFS file system using default parameters at the time of creation of a system. Now looking at the output of xfs_info, it show 0 for the values of sunit and swidth. I can't seem to find ...
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378 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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102 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 ...
2
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1answer
5k views

ZFS import unable to find any pools

I had a ZFS pool -- a mirror containing 2 vdevs -- running on a FreeBSD server. I now have only one of the disks from the mirror, and I am trying to recover files from it. The ZFS data sits in a GPT ...
2
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1answer
46 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 ...
2
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1answer
78 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 ...
2
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140 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 ...
2
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1answer
228 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: ...
2
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1answer
653 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 ...
2
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1answer
74 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' ...
2
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1answer
123 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, ...
2
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1answer
825 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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1answer
90 views

Slow file io performance after large network copy on Win7

In a step of our build process we run a tool that generates about 125,000 files. When generation is complete we copy them up to a network share so other systems can copy them down to process further. ...
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1answer
78 views

What distributed FS, with small files read / write workload perform better?

I have 2 machines sharing storage via iscsi (multipath), soon we add another one, this machines are Web app servers that read small files on shared storage ( < 256kB), and write them back. so we ...
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1answer
77 views

CorrectFilePaths (or alternative) for Server 2008

I have a server with Windows Server 2008 R2 installed, and a third party application that handles all our business transactions. The problem is, we're running out of space, and the root folder for the ...
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1answer
251 views

File Lock on Windows Server

I have a shared excel file stored on a server that continually results in "This file is locked by "another user". Do you want to open as read-only?". This is on a Windows 2003 R2 Server and has had ...
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1answer
119 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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1answer
542 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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1answer
101 views

IS GlusterFS filesystem partition smart enough to shrink in size due to new data on the server?

I'm new to GlusterFS but it works really well for me as a distributed file system. I have a question about my setup and if I should use the partition I store the GlusterFS brick on for anything else. ...
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1answer
39 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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58 views

How to prevent users from creating long paths

Long file paths cause real problems when need to move/copy or delete large amount of data that the path is 350 character long (max character allowed by Windows is 256) I was wondering if anyone knows ...
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27 views

Not recognizing path to credentials on fstab

I'm trying to mount a remote filesystem with fstab, and using a credentials file to load the username and password, but for some reason I get this error message when I try to use # mount -a: mount ...
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44 views

Save cache folder on seperate partition with superfast filesystem?

I'm reading about disks, partitions, filesystems, recovery. I have a lack of knowledge about them. To learn things I mentally model abstract situations. So, imagine... I have the ubuntu server with ...
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37 views

Restore shows tape volume error

I have used the below command to take dump on my RHEL server: /sbin/dump -0uz -f /data0101/backup_labeir1/labeir1_150622_123050_^apps.dmp /apps The dump is successful, but when I do a restore using ...
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303 views

How to repair multiply-claimed blocks?

I get a lot of the following logs in dmesg: [26159.277230] EXT4-fs error (device sdb1): ext4_iget:3875: inode #394497188: comm mv: bad extended attribute block 22794025699896 [26219.914802] EXT4-fs ...
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21 views

VZFS partition UUID

On a virtual system I have VZFS file system. It is /dev/vzfs. I need to find partition UUID but commands does not work (blkid); also /dev/disk device does not exist. How can I find this partition ...
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53 views

JPG file and other of higher size not downloading

We have a SAP application for official use wherein all the documents are uploaded and saved in a server and from where it can be downloaded by anyone after logging in the server with his/her user ID. ...
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63 views

Put “.nfs” files created by NFS client in another location?

The setup is a Linux machine that mounts a filesystem over NFS. There is a process that needs to recursively remove directories on the NFS filesystem and ensure the directories are successfully ...
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14 views

find space used by journal files

Is there any way to find the disk space used by journal. Running xfs on host and ext4 on guest. How can we see the space occupied by journals of these filesystem.is it possible.
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147 views

How to manage permissions on shared filesystem in Linux and export it on Windows?

It is a bit complex scenario so I will try to make this a simple as possible for you. ENVIRONMENT I have a shared filesystem on Linux which I export on Windows using Samba4 and users which belong to ...
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31 views

Order of execution: First file system, then array vs. first array, then file system

Suppose I have two HDDs, same manufacturer, same model, same attributes (volume, speed, cache, ...). Both are equally partitioned. I want to have a level one array of two disks with one ext4 ...
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183 views

Dealing/Fixing the Ploop issue with OpenVZ — relclaiming lost space

So OpenVZ Ploop has a bug where if users add then delete files the space becomes unclaimed and the disk eventually runs out of space. Now there is a script that fixes that(included below). However, ...
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49 views

KVM Image consumes more space on disk than what du shows

I have a kvm image which by looking at it with du -sh consumes 13GB (12980888) but in reality it consumes 42GB. Found that out the hard way when I scped it and after 18GB it was still copying ...
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134 views

Linux filesystem ext4 fragmentation

I have a question about the filesystem ext4 and disk fragmentation: Does ext4 place files in the same directory near or next to each other on the disk? And if so how is it fragmented, for example is ...
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366 views

AIX JFS2 I/O performance problems

I have a fresh installation of AIX 7.1. I noticed that JFS2 file system with logging enabled (log=/dev/hd8) is dramatically slower than one with log=NULL. Simple zip archive extraction takes 5 minutes ...
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183 views

RAID5, unknown filesystem and disk failure

I have an Ubuntu 12.04 machine with 3 disks in RAID5, and the RAID controller is on the motherboard. After almost a year of flawless use, it seems that one disk had a failure. Every time I restarted ...
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157 views

Linux Kernel messages in log - disk write seems to be hanging on database

I was having database issues whereby commits were not completing (PostgreSQL) and it seems to be related to these messages that are filling up my server log: Jan 30 02:29:45 server001 kernel: ...
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37 views

How to rearange disks with a new SSD

Here is the problem: I have a Debian server with only 4 disk bays. At the moment there are 4 x 1GB SATA disks in software RAID 10. I'd like to swap one of the SATAs with a 1GB SSD disk and move the OS ...
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33 views

Can quotas be turned on automatically when file system is mounted?

I was not clear on this point-- I have quotas enabled in /etc/fstab for several file systems on a file server. However, I have noticed that if I unmount the file system and then remount it (ext4), ...
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88 views

Prevent mountpoint from being remounted read-write

Is it possible to force a filesystem to be read-only, unable to be remounted (even by root) as RW? It is not necessary that the mounted volume be recoverable after reboot. One way I have experimented ...
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49 views

Deleting a large error log file

We have a few PHP sites running on a windows server that are generating errors in the c:\windows\temp directory under a single log file. This file is nearly 30gb at this point. When I try to list the ...
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902 views

How do I reboot over SSH, so that fsck can be run, on a read-only file system without sudo (or root)?

I have a server in a remote location, which I think is suffering disk issues and has remounted / as read-only. My Debian (Squeeze) installation does not have a root user. I have been using sudo to ...
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168 views

Samba: Moving File Loses ACLs

We have implemented Samba on our campus. Accounts and groups are maintained in an LDAP DIT. Access to shared folders is group based. Our Samba share definitions have something like: valid users = ...
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82 views

List unsynced blocks/files?

Is it possible to somehow list changed blocks or file system buffers that have not been written to the disk yet? How?
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20 views

Grub Rescue, always getting unknown filesystem

After launching fsck command and rebooting a Debian server, i run into grub rescue mod. So am trying to recover my system but with nothing when i execute ls i get : (hd0), (hd0, msdos5), (hd0, ...