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.
4
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1answer
379 views
ESENT fails to determine the minimum I/O block size
I'm trying to get RavenDB running in embedded mode on a shared/multi-tenant webhost. RavenDB relies on the ESENT storage API. The filesystem on the hosting machines is locked down. The RavenDB ...
3
votes
1answer
85 views
can 'Percona MySQL Data Recovery' be used to recover dropped tables if the datadir filesystem is mounted as /
according to Percona:
Unmount the filesystem or make it read-only if...
You have filesystem corruption OR
You have dropped tables in innodb_file_per_table format
If I have innodb_file_per_table ...
3
votes
1answer
103 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
votes
1answer
34 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
61 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
votes
1answer
95 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
2k 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 ...
2
votes
1answer
481 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 ...
2
votes
1answer
229 views
Performance of Loopback Filesystems
Has anyone done any performance/benchmarking tests on Linux loopback file systems? What has your experience been so far. Is there any serious degradation in performance? How about robustness?
...
1
vote
1answer
238 views
Problems mounting HPUX LVM+VXFS filesystem on Linux
I have a physical disk from a HPUX system that I need to access from a Debian Linux for ia64 system. From the hpux-lvm-tools project I have the tools to access the HPUX LVMs (Linux LVM has a different ...
1
vote
1answer
231 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
vote
1answer
151 views
BackupExec 2012 File System Archiving - Access is denied to Remote Agent
Gentlemen,
I've been struggling with a Trial version of Symantec Backup Exec 2012 for about a week now. It was installed as an upgrade to our 12.5 license, and the setup completed with no issues. ...
1
vote
1answer
50 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
vote
1answer
665 views
prevent filesystem from entering read-only mode
I have found that my server's filesystem is continuously entering read-only mode. There have been some issues with the raid1 array, but I have removed the bad disk from the array. However, it is ...
1
vote
1answer
384 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
320 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
263 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
158 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 ...
2
votes
0answers
27 views
Does Windows contain default System ACLs for auditing purposes?
While trying to test SACL creation on a filesystem object, I noticed that it was not logging to the event log. After some digging, I found that I had to flip the "master switch" in Local Security ...
2
votes
0answers
779 views
Recovering a VHD after resizing it using VBoxManage
I am using VirtualBox 4.1.18 and had a virtual machine running Windows 8 RC with a single VHD, which was initially sized at 25GB (too small!).
After installing the OS and some applications I ran out ...
2
votes
0answers
142 views
What ZFS file structure to use for zfs-root linux system?
In ZFS, you can build your filesystem hiearchy to include different fs-attributes per filesystem. For insance, compression in one area, no-exec/suid in others, noatime.
For example, a HOWTO for ...
1
vote
0answers
118 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 ...
1
vote
0answers
48 views
Ubuntu 10.04 Server stuck at grub prompt
I have a virtualized server running 10.04 LTS that is no longer booting. We had a number of issues with our SAN that abruptly disconnected the storage from the virtual machine infrastructure and ...
1
vote
0answers
137 views
Slow Client to Server transfer speeds… Fast Client to Client
Client : Windows 7 x32 | Dell Latitude E6510, transferring to another identical machine over the network.. 120mbs.
Transferring to any server (2003 server, 2008, 2008R2, or VM's) I can not get more ...
1
vote
0answers
579 views
network-mapped file system drops to read-only mid-stream, buffer I/O error with device mapper
Under linux 2.6 (CentOS 5.3 actually), I have a file system that works okay for a few minutes, then drops to read-only mode, while I am trying to read/write data to it.
It is an ext3 file system ...
1
vote
0answers
412 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
0answers
77 views
Effective backup and archive strategy for database and linked files
I am using Postgres to store a variety of application data for a webapp. Part of the application involves storing and retrieving user uploaded files. I am storing the files in the filesystem with ...
0
votes
0answers
15 views
Inodes after extending filesystem
If I make a ext4 filesystem and add about 20% of extra inodes, how would this effect the inode count if later I extend the filesystem? Would the extended filesystem also automatically add an extra 20% ...
0
votes
0answers
27 views
is it possible to mount blackhole filesystem which would reply with file-exists to any request
is it possible to setup the folder on linux to automatically reply with empty file (or preferably containing indefinite amount of newline characters) on each request? basically something like ...
0
votes
0answers
23 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
32 views
Creating a /home partition
root@host [~]# df /
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 955486988 12629636 894321444 2% /
root@host [~]# cat /etc/fstab
#
# /etc/fstab
# Created ...
0
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0answers
41 views
How can I move s3 objects >5gb from one bucket to another?
Objects larger than 5GB are supported with multi-part uploading. We have 5gb+ files in one bucket already that I'd like to move to another, under the same AWS account. When I issue the command using ...
0
votes
0answers
49 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
votes
0answers
58 views
openvz mounting
Is there a correct way to do this?
One way I've seen is
tmpfs /dev/shm tmpfs noexec,nosuid 0 0
tmpfs /tmp tmpfs noexec,nosuid 0 0
tmpfs /var/tmp tmpfs noexec,nosuid 0 0
another is
mkdir /root/tmp
...
0
votes
0answers
29 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?
0
votes
0answers
266 views
Formatting SD card with yaffs2 (using mtd2block)
An answer to my previous question: Making SD card corruption-proof suggested using mtd2block and formatting the SD card with yaffs2 or JFFS2.
I don't really have experience with creating images of ...
0
votes
0answers
14 views
before uninstall: check if file gets used
On a server (ubuntu 10.04) there are some packages installed which I want to remove. But before uninstalling I want to see if these files (python modules) get used.
I want to monitor these files a ...
0
votes
0answers
60 views
What's the risk in turning off Windows XP file system tunneling?
File system tunneling is discussed in the answers to this question: Incorrect file creation date in Windows XP/Vista
Does any recent software depend on file system tunneling to maintain the creation ...
0
votes
0answers
72 views
File exists but is unreadable by PHP
More than once I have ran into this issue: I have a cache file that is automatically generated by PHP. It contains some generated PHP code. However for some reason the file cannot be read and parsed ...
0
votes
0answers
129 views
JBD: Spotted dirty metadata buffer
Sep 25 22:19:38 host kernel: [7798806.146942] JBD: Spotted dirty metadata buffer (dev = loop0, blocknr = 267). There's a risk of filesystem corruption in case of system crash.
Sep 25 22:19:38 host ...
0
votes
0answers
394 views
XEN Domain crash - kernel panic
I have a server with CentOS 5.8.Final, running the 2.6.18-308.4.1.el5xen kernel. I installed the Virtualizorpanel 2 months ago and my VPS are OK, but yesterday one of my VPS crashed. I changed theRAM ...
0
votes
0answers
115 views
Cannot reference LVM2_member FS-based disks with /dev/disk
I'm playing with using LVM to concatenate a number of old disks into one big disk. I'd like to use /etc/hdparm.conf to modify the spin-down times at boot, so that most of these disks spin down asap. ...
0
votes
0answers
41 views
Deleting file in AFS slow in the morning
When I come into work in the morning the first thing I do is authenticate to Kerberos and run aklog so I can access my AFS file system. I then delete an old tripwire report in my AFS space that I ...
0
votes
0answers
629 views
Can't mount logical volume, RAID/MD/LVM problems
I have a file server with 48 2TB HDDs split across 2x 3ware 9650SE-24M8 RAID cards. Both cards have 24 drives in RAID 1+0. MD softraid is setup in raid 0 with the two RAID 1+0s making RAID 100. LVM2 ...
0
votes
0answers
108 views
I can access \\server via explorer but a program wont
From ServerA I can access \\ServerB\Telephony\Files\abcdefgh.pdf using windows explorer. From the same ServerA when I try to access the same file on ServerB using a program (a program that imports ...
0
votes
0answers
186 views
File-level SSD cache
My windows development environment gets pretty slow sometimes, it's a huge code base. I was thinking of speeding this up by using an SSD, but I want a way to do it while not requiring myself to carry ...
0
votes
0answers
100 views
Utility that waits for file to show up, then can execute a batch file when it shows up
I'm looking for input from the community for a utility that can set up a filesystemwatcher, ie, it can hook into File System events that detect when a file is created in a specific directory, and then ...
0
votes
0answers
94 views
how to read file system headers?
I want to know the abstrat content of a page in a file system in a disk image(not necessarily over the network). I believe the best way to do it is to read the file headers. but i do not know how to ...
0
votes
0answers
12 views
Vista filesystem woes
I have a program that reads settings from a settings file in C:\Users\MyUser\AppData\Roaming\MyFolder\program.settings
Then I deleted the settings file, but the program still can read it although its ...
0
votes
0answers
44 views
If two directory copy processes are run simultaneously, will the respective directories be stored in contiguous blocks or interleaved?
Assuming that there is ample free space on the device, and it isn't fragmented.
I'm interested in answers for various operating and file systems.
