Ubuntu :: File Location On Disk & Access Speed?
Aug 23, 2010
On a modern system--Lucid, SATA 3.0--does the location of a file on the physical disk make an appreciable difference to its access speed? If so, is there a (safe) way to put a file in a particular place on the disk?
I ask because I would like to reserve some space on disk to remain unused without messing with the partition table. My thought was to do this by using dd to create some large files (4 Gb each, or so) containing zeros.But obviously I would like to put them on the slowest part of the disk, as they won't be used for anything.
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Mar 27, 2011
i have amd athlon x2 3gb RAM ddr2 two hdd one 80gb other 1tb in this computer i got only ubuntu all disk in EXT4.i want to copy 10gb many file of 700mb or 1gb ( many linux ISO )the transfer is 1mb/s this is SOOO SLOW.i did a touch /forcefsck just in case but nothing happen it is still slow!!what might be the problem ??
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Aug 19, 2009
I installed Apache server with Debian 5.0.2 Lenny. I am trying to write a script which would analysis web log files. I found the log files on /var/log/apache2. There is an access log file, `access.log`. My question is what configuration file determines the location and the name of the access log file. How can I change them? I used CustomLog in /etc/apache2/apache2.conf like below.LogFormat ": %h %l %u %t "%r" %>s %b" common
CustomLog /home/test/my_log_file common Apache2 generated /home/test/my_log_file. But no logs were written in the file even after I run `/etc/init.d/apache2 restart`. Ichanged the log file location. It still didn't work. However, Apache2 still wrote logs in the file `/var/log/apache2/access.log`
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Feb 12, 2010
I am investigating full disk encryption and have made a DD copy of the hard drive which has been encrypted, this DD file is stored on my computer for analysis.
First question is - Anyone know how i can access data in this DD file even though its been encrypted?
Second question - Is there a DD command where i can image the systems memory? I ask this because when a system is turned on, to get past the pre-boot authentication stage you need a password. From what i understand, this password will be passed in to ram when power is applied to the system. Making a copy of the memory will also copy the password?
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May 10, 2010
I have what seems to be a hard disk Write speed problems with my first hard drive. Timing the cp command of a 700 Meg file takes about 8 secs from disk 2 to 3 but takes 25 minutes from disk 2 to disk 1.
Here are the details:
Kubuntu 9.04 (Kernel 2.6.28-15-generic)
Hard Disk 1 : /dev/sda (WDC WD2500KS-00MJB0)
Partitioned
/dev/sda1 ext3 / 10 Gigs
/dev/sda2 extended 222 Gigs
/dev/sda5 linux-swap 2 Gigs
/dev/sda6 ext /home 220 Gigs
Hard Disk 2 : /dev/sdb (WDC WD2500AAKS-00F0A0)
Partitioned :
/dev/sdb1 ntfs 16 gigs
/dev/sdb2 xfs /home/eric/data_drive 216 Gigs
Hard Disk 2 : /dev/sdc (ST3500320AS)
Partitioned:
/dev/sdc1 xfs /home/eric/data_drive2 465 Gigs
By doing 'time cp ...sdb1/test.avi ...sdc1' takes about 8 seconds and same vice-versa. the command 'time cp ...sdb1/test.avi ...sdb1/test1.avi takes about 11 seconds and the same holds true if sdc1 is used But copy sdb1 or sdc1/test.avi to either sda1 or sda6 and it takes 25 minutes. Same problem if I copy from the same drive partition (sda). I have booted a livecd Knoppix 6.2 and the same problems happens.. So safe to say it's not Kubuntu. The only thing that is left to do is backup and reformat the partitions as XFS and try again. I also did a full smartcontrol Extended test and no errors. Checked all the various logs and nothing found.
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Jun 10, 2011
I have a big problem my hard drive is works fast all the time and now i hear clicks and scratching and weird stuff from so how can i make it slow down. i cant buy a new one if it breaks down ...
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Oct 22, 2010
I've recently updated my ubuntu lucid to maverick (32bit).However I noticed a strange issue at boot. My boot time is increased more than three times(tried to reprofile, but with no improvement) from 24s to 1.23min.After some bootcharting,I noticed that the disk utilization during maverick boot seems to be at 50% for most of the time and also the cpu seems to work at half speed for most of the time...My laptop is an asus m51sn, intel t8300, nvidia geforce 9500m gs, 3gb ram, 500Gb WD scorpio blue hdd.
bootchart for maverick:
bootchart for lucid:
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May 3, 2011
im on 10.10(desktop) and mdadm was v2.8.1 from 2008, very out of date so i tried 3.2.1 -> no change. mdadm raid1 read speeds are the same as single disk. note i used the tests in the disk utility benchmarking tool at first --these showed raid 5 atleast to be much better but when i tried dd reads raid5 dropped off with larger data to almost the same (slow) speed as raid1. compare:
[code]....
using two partitions will be enough to show raid1 performs at single disk speed. I dont really want to use a 4 disk raid0 just to get the read speed i should be able to get with raid1 as i dont really care about the size loss. I would of course use raid10 but i have found this suffers from the same problem (achieve same read speed as 2 disk stripe). So whilst im shocked others aren't reporting this, unless there is some obscure reason why my system would give these results i think raid1 in not behaving as it should.
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Dec 14, 2010
How do I check my hard disk Revolutions Per Minute (RPM) speed from a Linux shell prompt without opening my server case? any other third party utility please let me know.Ieferenced some other articles. they give only model number, serial number and disk space.
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Nov 29, 2009
how can I check if disk devices are running at the proper speed (read/write access)?What are, for example, the correct values for ATA o SCSI device, if I test them with hdparm?
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Dec 14, 2010
How do I check my hard disk Revolutions Per Minute (RPM) speed from a Linux shell prompt without opening my server case?
I referenced some other articles. they give only model number, serial number and disk space, but I need Hard disk RPM speed using shell script. any other Java program
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Sep 14, 2010
I got a new machine with GA-p55A-ud3 mobo and a WDC WD10EARS 1T disk.
When I tried to benchmark the disk IO, I was suprised by the low write speed:
The related output from my lspci:
The related output from my lshw:
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Jul 29, 2011
Trying to understand grep,sed,awk but maybe its too early for me and also i suspect iostat is not the correct program for exactly what i'm looking for...The goal is to print only the current read and write speeds of the disk, represented in a numerical value with two separated commands. So for example when writing a file to disk from an external disk, the value reflects the speed of the process.
"iostat -dk sda" prints
Code:
Linux 2.6.38 (Infidel) 07/30/2011 _x86_64_ (4 CPU)
[code]....
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Nov 9, 2010
I'm quite new to ssh tunneling but I now want to make one of my machines at home accessible to my lan network here. I used the following command to make it available trough 127.0.0.1:5555(lo interface):
ssh -L 5555:192.168.0.15:80 me@xx.xx.xx.xx -N
now I want to make it available to eth0 on 192.168.1.40:5555 How do I do this?
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Jan 22, 2010
I've got this in my Apache2 config (on a Ubuntu 9.10 server):
Code:
<VirtualHost _default_:443>
DocumentRoot /srv/svn
<Location /repos>
DAV svn
[Code]....
When I comment out the "allow from" line, I have no access to this server at all, but when "Allow from 127.0.0.1 172.23.120" is activated, I can also access that location from other IP's (I can even access it from the internet).
What I really want is access limited to the IP's in "Allow from" because I don't want anyone accessing our subversion repo's from anywhere else.
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Mar 12, 2010
in case you have been wondering how some websites hide the exact location of a file on their filesystem, just thought i'd share it with the commnity at large in case someone else is looking for something like this.i take no responsibility for how it is used.
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Sep 14, 2010
I got a new machine with GA-p55A-ud3 mobo and a WDC WD10EARS 1T disk. When I tried to benchmark the disk IO, I was suprised by the low write speed:
[Children see throughput for 1 initial writers = 35962.63 KB/sec
Parent sees throughput for 1 initial writers = 35962.63 KB/sec
Min throughput per process = 35962.63 KB/sec
[code].....
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Dec 26, 2010
I love to use opera & especially like the speed-dials.. the file I need to edit is 'standard_speeddial.ini' however I do not have enough access & have no idea how to get it (& I have tried as well).
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Jul 7, 2011
is there anyway i can speedtest.net with ssh access into my server ?
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Jul 12, 2010
I am having a problem with my CentOS based server where the hard drive speeds are incredibly slow for both of the hard drives installed -
Code:
Timing cached reads: 16512 MB in 2.00 seconds = 8272.92 MB/sec
Timing buffered disk reads: 12 MB in 3.01 seconds = 3.98 MB/sec
I have looked around but do not understand the complexities of rebuilding kernel etc so would need some assistance. I have checked IO_support and it is set to 0
Code:
Here are the results for hardware installed after a quick lspci -v
Code:
If there are any noticeable incompatibilities here and how I could work to speed this up. I only have SSH access and could possibly get a KVM on it as it is currently locked up in a DataCenter.
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Feb 24, 2011
I want to backup some data on my Fedora box to a external Hard Disk (USB). I mounted the external HD on my box. I wrote a bash script to do that and I scheduled a cronjob to execute the script. When I am online the script executes as planned. However when I am logged out the copy does not work. I also tested this with a cifs mount (via fstab) and that does not work either. I set the script to generate some output at the end and that is OK so the script does run when I am offline. I suppose the mounted locations are not reachable while logged out, is that correct? Is there a workaround so I can reach the mounted locations while logged out?
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Oct 10, 2010
I have Samba share setup on my Laptop running Lucid Lynx, for my home network,wireless The copy speed for my movies, when I access them from Windows laptop is too pathetic. Took 22 min to copy around ~1.6GB of data, giving me a speed of only 1.2 MB/s
Haven't seen nething that bad What settings do I have on my server which can improve the copy speed ??Smb.conf is pretty simple and default
Code:
[global]
workgroup = WORKGROUP
netbios name = scooby-laptop
server string = "ScoobyDo server (Samba, Ubuntu)"
dns proxy = no
log file = /var/log/samba/log.%m
[Code]...
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Jul 22, 2011
usb devices, such as external hdd, memory stick and mp3 player, when I connect them to USB, they show up in Nautilus, but when I click on them, Nautilus is unable to mount them and returns the following error: Unable to mount location Error mounting: mount exited with exit code 1: helper failed with:mount: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error in some cases useful info is found in syslog - try dmesg | tail or so
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Nov 29, 2010
File is named similar to : logout 10.10.10 100817.txt
I need to copy this to a new directory.
To fine the latest file I was advised to use code...
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Dec 30, 2010
How would I edit, from Terminal, the programs that run at boot? I'm making a project that's actually kind of cool and I need to add a program and remove a program, all without using a GUI.
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Dec 16, 2010
Every partition in my ubuntu machine starts with "320 GB Hard Disk" followed by partition name, Even If I renamed it. I want to remove this, can I ? Another question. Can I arrange those partitions by there locations in the physical hard drive? meaning that the first 30 GB in the disk appears with there names at first.
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Sep 24, 2010
I would like to copy a Compiz settings file to a new installation, so I would not have to go through all the customizations again. Is this possible?
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Apr 26, 2011
I'm working with a program that uses Open Motif to create all of the widgets, including the Open File dialog box (obviously). However, Open Motif being kinda old-timey, 80's vintage, and for the most part now an abandoned project, it is quite clunky. So, actually what I need to do is to open some files located on my work server. I have already successfully connected to the relevant server directories with Samba, and with programs built with GTK+ (such as GIMP) I can open files across the network because I have created a bookmark in Nautilus, and those bookmarks appear in the Open File dialog box created by GTK+. Now, Open Motif is different: it doesn't see network locations, orNautilus shortcuts. When I type "smb://serveripyadayada" in the search folder, it really doesn't like it and complains. So, what do I do? Can I get somehow Open Motif to open a network location? Or can I do a run-around and place a shortcut in the file system that points to the network location?
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May 19, 2011
I have two machines running open vpn connected trough a 8 port Gigabit switch (Tp-link TL-SG1008D). The problem is when I try to transfer a file the transfer starts at 13 mb/s and drops to 300kb/s. When I replaced the ram on the two machines and restarted the transfer the speed was 13mb/s constant. How does changing the ram makes such differences (at the first transfer they had 512mb at the second transfer the machines had only 128mb) ? Os Ubuntu Server 10.04.2 LTS
PS :Tried with 256 ram and the problem persists...
Machines: two hp d530
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Apr 15, 2010
I renamed /home to /localhome and I'm getting an error message when I run 'Places->Videos'. The error is: 'Could not open location 'file:///home/<username>/Videos' Error stating file '/home/<username>/Videos: No such file or directory.
I'm using /localhome because /home is used for automounting home directories at my work. I prefer to use a local account rather than the NIS/NFS account.
What do I modify to have this reflect my new home directory location?
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