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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2k views

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 ...
6
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1answer
2k views

Mount Docker container contents in host file system

I want to be able to inspect the contents of a Docker container (read-only). An elegant way of doing this would be to mount the container's contents in a directory. I'm talking about mounting the ...
4
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1answer
155 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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1answer
189 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
45 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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1answer
199 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 ...
3
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1answer
190 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 ...
2
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1answer
225 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: ...
2
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1answer
72 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
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 ...
2
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1answer
66 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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1answer
120 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
143 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
votes
1answer
471 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
votes
1answer
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' ...
2
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1answer
120 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
votes
1answer
757 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 ...
1
vote
1answer
39 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 ...
1
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1answer
106 views

MHDDFS randomly breaks

I am using MHDDFS to pool a bunch of large disks together into a single filesystem that I can easily share across a network. For some reason every now and then the virtual filesystem seems to fall ...
1
vote
1answer
41 views

sFTP users permissions to overwrite/edit over root owned files

This is related to Give SFTP users and Apache write permissions on same folders So, I am using ACLs to give write permissions over /var/www. It works perfectly when developer login users upload new ...
1
vote
1answer
54 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: ...
1
vote
1answer
155 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
37 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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1answer
77 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 ...
1
vote
1answer
446 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 ...
1
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1answer
59 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 ...
1
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1answer
831 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 ...
1
vote
1answer
572 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?; ...
1
vote
1answer
347 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 ...
1
vote
1answer
232 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 ...
1
vote
1answer
534 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 ...
1
vote
1answer
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 ...
1
vote
1answer
674 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 ...
0
votes
1answer
31 views

Ubuntu - mounting partitions as read only

I have a server which has probably been shut down one time too many as a result of power cuts. Now when I log in, it's mounted every partition I can see as read only. I've looked up the solution, ...
0
votes
1answer
10 views

AVHDX internal format for use with TestDisk

I can't seem to find any info about this. What is a HyperV differential AVHDX file format internally like, for the purpose of forensic recovery? That is: Is it just straight blocks, like dd would ...
0
votes
1answer
41 views

Unable to mount fs, disk slice corrupted

please can someone help me with this issue. Now when i started sun server - it run on sunfire t100 and os od solaris 5.10, is display this: checking ufs filesystems /dev/rdsk/c0t0d0s7: BAD SUPERBLOCK ...
0
votes
1answer
39 views

Multiple lvms or one large lvm

Say you have a server that has two VGs (base and sys) and base is the standard partitions (root, var, etc.) and sys would be application specific partitions. I can't find any real documentation for ...
0
votes
1answer
46 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 ...
0
votes
1answer
110 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 ...
0
votes
1answer
99 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 ...
0
votes
1answer
208 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, ...
0
votes
1answer
153 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 ...
0
votes
1answer
334 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 ...
0
votes
1answer
35 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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
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0answers
74 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 ...
0
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0answers
44 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 ...
0
votes
0answers
152 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 = ...
0
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0answers
74 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?