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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ZFS: Best-practices doc state: “On systems with 1,000s of ZFS file systems…”?

The docs state: "On systems with 1,000s of ZFS file systems, provision 1 GB of extra memory for every 10,000 mounted file systems including snapshots." What does that mean - how do these people use ...
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Program Files (x86) redirected? win 2008 R2

I'm wondering if c:\Program Files (x86)\ is redirected somewhere else under win2008 Server R2. The thing is, a service is supposed to add/change fields in the settings file stored in Program Files (...
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2k views

High Availability NFS Server (Heartbeat/DRBD) long hang on clients when takeover occurs

We have a High Availability NFS environment using DRBD, heartbeat and nfs exposed to clients (Simular to the following https://help.ubuntu.com/community/HighlyAvailableNFS ). This seems to be a ...
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1answer
153 views

double mount check with ext3

I have two nodes connected to a SAN, and I want to be able to mount an ext3 partition on node B when node A goes down. I know I could use a shared filesystem, but for simplicity and performance I ...
5
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1answer
5k views

VirtualBox: vboxsf filesystem wrongly detected as readonly?

I have VirtualBox (Windows XP host) running a CentOS 6.0 virtual machine, with one shared folder. Here is the list of mounted devices: [root@localhost ~]# mount -l ... www on /media/sf_www type ...
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How to allow multiple people to change mtime -timestamp of a file through sftp?

I have a directory that multiple users have access to. They change, upload, and delete files in the directory. They all belong to the same user group. The files in the directory have access rights of ...
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1answer
138 views

Securtiy concerns about IIS websites' access rights - Restrict them not to be able to read c:\, etc

I have some security concerns about my IIS websites. From PHP-files (FastCGI) on our server the scripts are able to read my system's root directory (c:\), but even list the content of c:\windows. What ...
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4answers
2k views

Best way to prevent the root system filling up when a mount fails?

We have an internal web server (virtualized, hosting ReviewBoard, but not super relevant) and we have a relatively consistent failure mode with failed NFS mounts causing / to fill up. Distro is Ubuntu ...
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1answer
206 views

IIS 7, ASP.NET security nightmares

For no apparent reason that I know of, my ASP.NET website on my local development server (IIS 7) started returning Error Code 500 - Internal server error. After granting the user "Users (...
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1answer
784 views

Using amazon S3 as storage for attachments in a web-mail system

I am looking to use S3 as data storage service for a mail system. The idea is to allow users to upload files that serve as attachments to their emails, which are then available to download from the ...
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1answer
5k views

Is there a quick way to see what filesystem filter drivers are loaded on Windows 2008?

The question says it all, I think. I vaguely remember there was an easy way to do this, but don't remember what it was.
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1answer
78 views

Filesystem for web developing [closed]

My distro is ArchLinux. I have an empty HDD I would like to mount at /srv. What is the best filesystem for storing projects (PHP, Zend Framework, many files up to 100 kB but they may be bigger - ...
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1answer
2k views

Filesystem space available using SNMP

I'd like to collect filesystem space information using SNMP on Solaris 10 and Ubuntu 11.10. The problem is that SNMP doesn't seem to have an attribute that corresponds to the "Available" column in df. ...
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2answers
166 views

Slower/cached Linux file system required

I know it sounds odd but I need a slower or cached filesystem. I have a lot of firewalls that are syslog'ing their data to a pair of Linux VMs which write these files to their 'local' (actually FC ...
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1answer
3k views

File system full - except it's not

I've a Solaris 8 box which is reporting that a file system is full: db% tail -2 /var/adm/messages Nov 22 08:32:27 db ufs: [ID 845546 kern.notice] NOTICE: alloc: /u03: file system full Nov 22 08:34:51 ...
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2answers
263 views

Shared block device file system (cluster file system without networking)

Is there any file system that can be mounted multiple times and supports concurrent file access for Linux? Basically I want something like a cluster file system but without the need to have a running ...
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6answers
809 views

Deleting everything except newest files

Lets say I have a directory ḟoo/ which contains a lot of files in some sort of directory structure. I need to keep some of them, but not all of it. Is there a way to (in place) delete all of them ...
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3answers
6k views

How do I debug this FS error on a flash device?

I have console access to an embedded linux device. This device has flash memory part of which is partitioned as a FAT filesystem. Its running linux-2.6.31. However I am seeing these errors on the ...
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2answers
66 views

Good Linux disaster-ready filesystem? [closed]

I'm working on this emergency open wi-fi network project and it includes a local website (nginx + MySQL). In order to eliminate SPOFs, we're going to setup at least two of everything (server, switch, ...
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1answer
2k views

How can I identify the process(es) which are locking files on servers?

I'm currently investigating a problem with my company's build server; roughly 1/10 of the builds fail due to a file being locked. It's a Windows 2003 virtual server running on top of VMWare. The ...
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1answer
999 views

Input/output error in CentOS 6.0 (VirtualBox 4.1.6, Windows XP)

I'm running a virtualized CentOS machine, which has been running pretty well so far. Today, I noticed that some PHP extensions were missing, and realized that the problem was coming from unreadable ...
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2answers
1k views

Linux: Syncronize two directories permissions, users and groups and leave file contents untouched

In my Linux box I have two directories: work files with wrong permissions older versions of the same files with the right permissions (permissions and users and groups) I need to syncronize the ...
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2answers
2k views

Error growing XFS volume with xfs_growfs

I added another 8TB to my 20TB array and tried to expand it with xfs_growfs, no joy and no idea why it is failing. Much googleing has provided some answers but nothing that has worked. I am at my ...
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2answers
988 views

mount --bind and moving 2 files between mounts

My application architecture requires me to mount 2 folders at the same partition and move 2 files between them. I have the following mounts: /drive2/folder1 on /var/www/myapp/folder1 type none (rw,...
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1answer
35 views

Website and file/directory permissions

I've been given a task to fix this one website. One of its issues is that on one page, the images have broken links - the images are not showing, and clicking on the image (i.e. direct link to the ...
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1answer
33 views

Where to install sync and reporting scripts?

I have a linux server and a whole bunch of scripts that are used to run reports off of some databases and also sync data among various databases. All these scripts are to be run in cron. Should I ...
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3answers
7k views

samba stuck at maximum of 1024 open files

I'm running a Ubuntu 10.04 (lucid) samba fileserver. I have a Windows 7 client which opens a large number of files while doing a copy of thousands of tiny files at once. It receives the error "Too ...
2
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1answer
126 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, etc)....
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1answer
308 views

Why is NTFS better than FAT32? [closed]

Just wondering why NTFS is considered better, and how NTFS manages to do so (structure, actions, etc), compared to FAT. thanks! :)
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1answer
194 views

Disk buffer: why does it even exist in many disk controllers? [closed]

When you request disk for data, it usually first gets transferred to the disk buffer in the disk controller, and then it gets sent up to RAM (and thus stored in memory). I was just wondering what the ...
0
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2answers
292 views

Recommended filesystem, mysqltmp and filesystem related settings for a mysqld box running ssd + BIG ram + linux?

What is the recommended filesystem + mysqltmp location when dealing with a ssd based system that has some ram to spare? Currently we run our mysqltmp folder on a 4gb tmpfs partition. Works great. But ...
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2answers
84 views

Why do some filesystems out there have imaps to imaps to imaps (multiple imaps)?

It seems that the point of an imap is to hold points to individual inodes so that writes can be done in a really fast manner (can someone explain how this works as well?) but I was wondering what the ...
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1answer
623 views

How do concurrent filesystems work? [closed]

From learning about how filesystems use transactions and logs to make sure that the disk is in an atomic state even after there's been a system crash, I've become curious about how filesystems deal ...
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1answer
3k views

/tmp has changed to read only

Our sysadmin has left for the day and our production box (which isn't heavily used) is giving messages like Can't create/write to file '/tmp/#sql_1d2d_0.MYI' (Errcode: 30) /tmp has gone read ...
1
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1answer
44 views

taking snaphot using lVM

While taking snapshot of a logical volume using lvcreate command, I found like this: lvcreate --name test --snapshot --size=2M /dev/VolGroup/lv_root I am confused what 'size' here actually means ? ...
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2answers
2k views

Does the number of files slow down the server? [closed]

Having numerous files will obviously slow down the OS; but how much this problem is serious? Consider that the files have been well distributed over multi-level folders. Does still the number of files ...
2
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1answer
660 views

Who sets NFS modification time - client or server?

I was curious about what exactly time is going to NFS file metadata when client writes a file. My assumption is that client time is recorded and not NFS server's time. But I wasn't able to find out ...
0
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1answer
5k views

Unable to rename/move files/directories in Windows 2008r2 due to 'in use' state

I have a client with a Small Windows 2008R2 64 domain (about 20 windows 7 pro clients). They are just starting out and we're nailing down the directory structure. Some users have complained that ...
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2answers
343 views

SMTP/IMAP failover, filesystem options?

Given two hosts running SMTP and IMAP services, how would you best make them redundant so that one can easily take over if the other goes down? Keep in mind there are no other servers where network ...
0
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1answer
700 views

ext2 file system and Solaris 10

I have Solaris 10 installed on computer and I have USB flash drive with ext2fs partition. I want to mount flash drive and do this: 1) Download FSWpart and FSWfsmisc packages 2) Install: root~#gzcat ...
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1answer
139 views

Write-Anywhere File Layouts: Why are they so important? [closed]

http://en.wikipedia.org/wiki/Write_Anywhere_File_Layout Well, I can't say that I haven't given it a try, but I really don't know that much about computers so I'm not really sure what these sources ...
0
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2answers
5k views

Not able to mount ext4 file-system in Debian Lenny

I am trying to mount ext4 EBS volume in to my EC2 instance in Debian OS, whenever I try to mount I get the following error: mount: unknown filesystem type 'ext4' I googled around and found a ...
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1answer
866 views

Dell PowerEdge t710 raid configuration for newbie [closed]

My company bought a Dell PowerEdge t710 server with: 48 GB ram 4x4 GB ethernet ports. RAID 5 for PERC H700 4 x 1TB, SATA, 3.5-in, 7.2K RPM Hard Drive (Hot Plug) My job is to configure Hyper-V ...
0
votes
1answer
723 views

Which Linux filesystem is best for a huge Apache mod_disk_cache partition?

Talking about a huge (50GB, 500.000 entries) Apache disk_cache partition: Which Linux filesystem performs best for this task? In my example, the partition has a lot (500.000) of very small files (<...
0
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1answer
177 views

What is on a HDD sectors 1 through 62 under MBR-NTFS?

I do not understand why my partitions always start on absolute sector 63. What is the purpose of sectors 1 through 62? I understand sector 1 is the MBR but what about the rest? Thanks!
4
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2answers
462 views

S3 based file system capable of requesting only part of file

I'm storing large datasets in s3, but on a given computer in my cluster, my program only needs to read a small subset of the data. I first tried s3fs, but it downlooads the entire file first, which ...
2
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2answers
262 views

ZFS - setting physical disk start point of pool/filesystem

I'm testing harddisk performance, and would like to test writing to the outer tracks of my harddisk with ZFS. One way of doing this would be to create a pool/filesystem with a start point just a few ...
10
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2answers
18k views

How to remove bad disk from LVM2 with the less data loss on other PVs?

I had a LVM2 volume with two disks. The larger disk became corrupt, so I cant pvmove. What is the best way to remove it from the group to save the most data from the other disk? Here is my pvdisplay ...
5
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3answers
530 views

Why might `ls --color=always` be slow for a small directory?

For a certain directory DIR on my system, the ls --color=always takes about 8 seconds, although it contains less than 10 files and subdirectories. Without the color argument it takes no time. Why ...
3
votes
2answers
4k views

Server Frequently gets Read-Only File System

This server has RAID-1 configured. It get readonly file system everyday. if i reboot it, it gets back with a read-write file system. but after a short while, readonly again... Any idea please? Thanks....