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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Expandable Linux filesystem w/ redundancy & support for different drive sizes?

I did a bit of research already and didn't come across any filesystems so far that have the following features: Expandability, Redundancy, and the ability to utilize the full capacity of different ...
6
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3answers
599 views

Root filesystem filling up, no big files

So im a very new sysadmin, just got out of school and doing my internship. Only problem is that im the only sysadmin in the place and no one to show me the job. Anyway, it's a very small company, ...
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1answer
2k views

ERROR 1307 (0x0000051B) - While copying with Robocopy - None of the known sollutions work

I'm trying to copy a folder from one harddrive to another using the folowing robocopy options: robocopy "H:\Source" "T:\target" /E /COPY:DATSO /R:1 /W:1 /DCOPY:T /Z /LOG:T:\Belfirst_copy.log /NP ...
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1answer
1k views

How often should I defrag ZFS pools?

I ZFS scrub once a month which takes ~24 hours for the 72TB. For what I can find about how often I should scrub is: very busy pools, once per week not so busy pools, once per month or run a scrub, ...
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1answer
294 views

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 ...
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2answers
285 views

FS for many small files, mostly reads?

I need a direction since all the blogs/benchs seems to contradict. Goal: Having a lot of small files on FS in a directory tree fashion similar to this AB/CD/EF... Two size groups : G1 : 10-20 kB G2 ...
5
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1answer
135 views

How do NTFS permissions become improperly ordered?

I have some files on a network share and they were read-only accessible to users. I had set the permissions to provide full rights to all domain users - when I checked the main folder, this was still ...
2
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1answer
416 views

Best Linux filesystem for sparse files?

In some filesystems, blocks used when allocating new files are used to avoid reuse. When used for sparse files, such setup would lead to the file size constantly growing. Is there a filesystem that ...
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4answers
283 views

Partition required for ext4 filesystem?

I read on the arch wiki that it is not recommended to partition a disk before creating the ZFS filesystem on it. I searched but did not find any such statement about ext4. So my question is: can I put ...
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0answers
103 views

du, df and ls report wrong free / used space [duplicate]

We have an Ubuntu 12.04 server running on a VMware ESXi host, with multiple partitions, running Zimbra 8 (mta/ldap only). One of partitions is a 30GB partition mounted as /opt/zimbra/data. I had a ...
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2answers
92 views

How to allow an arbitrary group to mount a file system?

As far as I understood from the mount man page, by default only root is allowed to mount a filesystem. Filesystems with either the user or the users option can be mounted by any user. The owner and ...
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2answers
99 views

Removing Nested Folders where permissions are invalid and folder names are to long

I appears we have become a victim of not using the /XJ in a robocopy command, and we have ended up with a mass of nested folders. We want to get rid of them, but we can use the normal methods of ...
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1answer
85 views

Does NTFS / Windows as OS performs checksumming on file movement operations by default?

That's what I can't find Does NTFS / Windows as OS performs checksumming on file movement operations by default? alike ZFS or somehow else...
2
votes
1answer
57 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 ...
1
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1answer
89 views

How to purge strange files in lost+found

somehow i did end ip with a 'lot' of corrupted files in lost+found directory (centos) and I can't get rid of them. Any idea ? [/lost+found]# ls -la total 196 drwx------ 5 root root ...
3
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1answer
164 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 ...
0
votes
1answer
64 views

Long delays in local server folder acess - Server 2003

I have a 2003 server which is acting as file server, with a 2-disk 1 TB RAID-1 (software RAID, unfortunately). This has been working fine. Recently it occured that from time to time, when trying to ...
2
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1answer
285 views

Is file system alignment required on hardware-raid with SSDs?

We are building a raid-10 with LSI 9260-4i + 4 x Intel DC S3500 SDDs. Partition alignment From what I understand I need to start fdisk with -H32 -S32 or Ted T'so variant with -H224 -S56 in order to ...
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1answer
49 views

Can not move SQL Primary File

In the process of moving/upgrading old SQL server 2005, I need to move some sharepoint PWA datafiles. After detaching the database from the files, I am trying to copy/move the DB files from their old ...
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2answers
114 views

Monitoring file system activity of a process

Under Windows 7, how can I monitor all filesystem activity made by a specific process? Goal is to identify, which and when config files of a server process get loaded.
3
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2answers
939 views

Write once, read many (WORM) using Linux file system

I have a requirement to write files to a Linux file system that can not be subsequently overwritten, appended to, updated in any way, or deleted. Not by a sudo-er, root, or anybody. I am attempting to ...
3
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1answer
167 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 ...
11
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1answer
5k views

How can I recover an ext4 filesystem corrupted after a fsck?

I have an ext4 filesystem on luks over software raid5. The filesystem was operating "just fine" for several years when I was beginning to run out of space. I had a 9T volume on 6x2T drives. I began ...
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1answer
89 views

Does exportfs disrupt users already utilizing those filesystems?

I need to modify a servers /etc/exports file to export to an additional host. After modifying this file, for it to take effect (i.e. for the additional host to have access to the designated ...
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2answers
90 views

Is it a good idea to take onsite/offsite backups of server images?

Assuming a non-virtualized environment it a good idea to take actual images of servers (using something like Acronis True Image) and store them on\off site? Backing up data is great but I feel it ...
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1answer
89 views

low priority linux filesystem

Does anybody know of a some sort of (virtual) filesystem that will run as a low priority i.e. All other regular disk activity will take priority? The reason for this is an application I am developing ...
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2answers
8k views

How to find cause of main file system going to read only mode

Ubuntu 12.04 File system goes to readonly mode frequently. First of all I have read this question file system is going into read only mode frequently already. But I have to know if it's not caused ...
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2answers
74 views

Program complains not enough disk space even if the disk space exists

I have an EXT3 partition mounted in ordered data mode. If a power failure occurs when a program is creating files on that partition, I see that space usage reported is normal and I don't see any ...
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2answers
834 views

Fedora, fsck fails at boot

I'm facing a problem in my server during the startup. This is my actual configuration: 320GB each. Raid1 -> /dev/md127. Working. /dev/sda /dev/sdc 1000GB each. Raid1 -> Use to be /dev/md126, ...
0
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1answer
37 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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3answers
261 views

Distributed filesystem for storing temporary files

We have a cluster of web servers that currently stores temporary files (that have been uploaded by users) on a central shared filesystem. The limitation being that anytime the server containing the ...
0
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0answers
542 views

Direct I/O on Linux

I'm trying to enable Direct I/O on /opt (/dev/sda6, ext4) on Linux Mint 13. What I'm trying is: mount -o dio,rw /dev/sda6 /opt as root. The system responds with: mount: wrong fs type, bad ...
2
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3answers
116 views

zfs on a single device: what happens when a file is corrupted?

It is written everywhere that ZFS is helpful even if you only have one physical device, because it will tell you about data corruption due to bit decay and such. However, can it actually address such ...
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0answers
36 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 ...
1
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1answer
42 views

What allows a mail server to operate faster or handle more mail? [closed]

I realize that this may be better suited for StackOverflow.com instead, however as I'm not much of a developer, I worry those answers may be way too developer-centric. Although, I would like some ...
6
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1answer
1k views

In NTFS, what's the difference between sector size, block size and cluster size?

For example, I have a volume with the following info extracted from ntfsinfo: $ sudo ntfsinfo -m /dev/sdb1 Volume Information Name of device: /dev/sdb1 Device state: 11 Volume ...
2
votes
1answer
246 views

Linux: File is not shown in ls but cannot be touched with message “File exists”

I can remember creating this file but it disapeard. But not completely: root@XXX:/etc/vz/conf# ls -al total 0 drwxr-x--- 2 root www-data 0 Okt 1 16:04 . drwxr-x--- 2 root www-data 0 Okt 1 16:04 .. ...
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1answer
31 views

Photo storage / sort

I'm wondering what the best practice is for photo storage. I'm in the business of storing photos with a user. Each user can have up to 35 photos and we currently have around a 100k users. I currently ...
4
votes
3answers
214 views

How to allow SSH logins even when filesystem forced check fails

Intro I'm having a problem with a few servers (CentOS 6.4) in a production environment, the problem is making the servers crash from time to time and we need to actually reboot those server in order ...
3
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1answer
137 views

Does having too many files on a filesystem significantly impact io performance?

My sysadmin is telling me that we should remove old static files from a server and store them in a database instead because having too many files on a filesystem impacts the general performance of the ...
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votes
1answer
53 views

What tool/application (free or not) should I use to generate and write lots (TBs) of data, fast [closed]

I am testing a storage appliance and need to write TeraBytes of data to it. Using fio or dd takes days to write that much amount of data. Are there any (free or not-free) tools/applications, that I ...
4
votes
3answers
254 views

Store multiple versions of large binary file with minimal data duplication (preferably Linux)

I need to store multiple versions of a ~ 150 GB binary file (qcow2) on Linux servers with local storage, and was hoping there is some solution that involves just keeping diffs that can be merged as ...
6
votes
1answer
206 views

Correct usage of /srv on debian systems

I'm a bit confused about what goes inside /srv and looking for good practices about its usage on Debian. Acording to the FHS: "/srv contains site-specific data which is served by this system". ...
12
votes
1answer
451 views

ext4 listing of files very slow in one specific directory that contained lots of files before

Background I had a small logrotate misshap... Logrotate would rotate the archived logs by misstake causing a quadratic growth of files in my /var/log/. And by the time I caught wind that something ...
8
votes
2answers
489 views

Why “lsmod | wc -l” not equal “ls /sys/module | wc -l”

Why do these two commands return different results? lsmod | wc -l 100 ls /sys/module | wc -l 138
4
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1answer
410 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 ...
7
votes
2answers
267 views

How can you find the parent snapshot of a zfs clone?

I made a clone of zfs filesystem that has a number of snapshots. I also have several replicated copies of the filesystem. How can I find which filesystem/snapshot a clone is attached to? (Seems ...
4
votes
2answers
346 views

inconsistency between du -sh and df -h

I know this is a common occurrence when the result of du -sh is smaller than that returned by the file system with df -h. (Because some files are still open in processes etc..) But in my case I have ...
2
votes
1answer
105 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 ...
0
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1answer
88 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 ...