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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269 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
46 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
99 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
778 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
162 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
4k 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 ...
0
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1answer
80 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
87 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
85 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
5k 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 ...
0
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2answers
686 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, ...
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1answer
34 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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228 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 ...
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0answers
455 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 ...
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3answers
110 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
35 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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1answer
40 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 ...
5
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1answer
743 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
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1answer
190 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 .. ...
0
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1answer
29 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
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3answers
184 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
129 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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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
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3answers
224 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
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1answer
194 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
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1answer
398 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 ...
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2answers
400 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
334 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 ...
6
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2answers
179 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
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2answers
290 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
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1answer
96 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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1answer
83 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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2answers
77 views

Next-gen filesystems: disk space usage log?

From time to time I run into problems when server hard disks (Linux) fill up quickly with lots of small files. When this happens I have to try to figure out how much space is being taken up and where ...
2
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0answers
69 views

How do I perform an I/O network performance benchmark [closed]

For testing read in an attached devices I use hdparm, now I installed glusterfs and I need to perform a network filesystem benchmark. What tools you will use in this case ?
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1answer
65 views

any tool/script to import a file listing / directory structure into a relational database? [closed]

...along with some basic metadata like dates and sizes Should work on windows, otherwise DB and platform/language does not matter much. Although I can and earlier have scripted stuff like this, I do ...
2
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1answer
165 views

How long does Linux (by default) cache information about files in the disk?

I'm testing whether some changes I made to some code are effective or not. For this, I need to know how the file system cache normally works. I'm assuming the default is what we're getting, since we ...
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1answer
85 views

Is there downtime by remount /tmp

Just want to know, Is there any downtime by remounting /tmp filesystem. step 1. mount -o remount defaults,exec /tmp step 2. mount -o remount defaults,noexec,nosuid,nodev /tmp
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2answers
62 views

Fetching all PHP files and store their size

I like to monitor every php file with their size (and if a new file has been added). On my server are more than 200 000 of em so find takes very long. This is what I do: ls -1 --size $(find -P . ...
1
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1answer
65 views

cvs accidentaly breaks rcs file

I have an cvs server with pretty big binray file (about 50Mb) and its rcs file is about 2G Today I discovered that file update returns an error: cvs [update aborted]: unexpected EOF reading ...
0
votes
1answer
126 views

Accessing iSCSI LUN from OS X and Debian simultaneously

My setup is the following: Synology Disk Station as iSCSI target OS X 10.8 as client Debian as client I don't like to know that I should use WebDAV or similar file sharing protocols. I'd like to ...
3
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3answers
236 views

Cleaning up junk and logs on unix/linux

I manage some unix systems, and users on my system are creating a lot of junk and littering their work areas. I am running into filesystem full every day. There are many terabytes locked up and is ...
2
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2answers
785 views

How to determine POSIX advisory file locks are working in simfs in the VM I'm using?

I'm looking for a command-line utility or some other way to test effectiveness of file locks, specifically POSIX advisory locks (which aren't only for POSIX, btw) in a Linux filesystem. Specifically, ...
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0answers
93 views

How do I speed up “ls -l” on a network file system (NFS)?

I have a NFS volume mounted in the following way: theHostname.com:/path/on/theHostname on /local/path type nfs (rw,nosuid,addr=10.0.0.54) The /local/path directory has 30_000 files. When I do a ls ...
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28 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), ...
2
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1answer
101 views

Why do some files in dir list appear in red & have '?' instead of the file properties?

I've just found that in at least one user's Maildir some of the files in the cur directory appear 'flashing'(!) in red in my terminal and the same files have their properties/attributes replaced with ...
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96 views

Can't mount ecrytpfs as a non-root user on Red Hat

I'm trying to mount a ecryptfs volume on Red Hat as a regular user. ecryptfs-utils is installed from source (repos only contain old versions). Mounting as root works normally, but trying with a ...
2
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1answer
49 views

File system permissions lost or unseen

Ok, I have an apparent WTF question here. I log as root, I run: # ls /var/lib/gitolite3/.gitolite/logs/ -l -rw-rw-rw-. 1 gitolite3 gitolite3 5570 Aug 2 21:00 gitolite-2013-08.log No problem? I ...
3
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4answers
2k views

Cannot install centos 6.4 with XFS

I would like install centos 6.4 and use XFS as filesystem for some partitions in my configuration. But Anaconda don't propose XFS in the filesystem choice. Then I try to install in text mode but in ...
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1answer
87 views

Is there an issue with too many entries in a directory?

We have a system that uses Jira, and Jira stores attachments to tickets in /opt/jira/jiraattachments. Under that directory is the project name RRT, and under that is a directory of tickets. Thus, ...