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  • How to calculate proper amount of inode/block sizes for a linux filesystem.

    - by Donatello
    I have an old reiser filesystem which I'm going to convert to Ext3. The problem I have is to determine the proper block- and inode-sizes for this partition. The partition is 44 GB large and has to hold 3,000,000+ files of sizes between 1 kb and 10kb, how can I figure out the best ratio of inodes and blocksize? The below is something I tried which seems OK but makes the copying files incredibly slow. mkfs.ext3 -t ext3 -c -c -b 1024 -i 4096 -I 128 -v -j -O sparse_super,filetype,has_journal /dev/sdb1 Thanks.

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  • How can I set `less` or `more` max lines (scrollable height) limit/boundary in linux?

    - by Rudie
    (Sorry for the title. Any suggestions?) I've set my commandline PS1 to cover 3 lines: white space user, server and pwd $ or # to input I think less (or more?) is configured to break after window's height - 1, because when I do a $ git log, the first two lines are invisible at the top of the window and the rest is scrollable. I'm not sure who handles this scrolling and its configuration, but I assume GIT uses less/more. Where can I configure that my scrollable window is window height - 3 lines and not window height - 1? More info: If I cat lines.txt | less with a 23 line file, it shows the entire file and no scrolling. If I do the same with a 24 line file, it doesn't show line 1 (and no scrolling). With 25 lines: doesn't show lines 1 and 2 (and no scrolling). With 26 lines: shows line 1 and scrolling! The less breakpoint is at the wrong height...

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  • How do I find out when and by whom a particular user was deleted in linux?

    - by executor21
    I've recently ran into a very odd occurrence on one system I'm using. For no apparent reason, my user account was deleted, although the home directory is still there. I have root access, so I can restore the account, but first, I want to know how this happened, and exactly when. Inspecting the root's .bash_history file and the "last" command gave nothing, and I'm (well, was) the only sudoer on the system. How would I know when this deletion happened? The distro is CentOS release 5.4 (Final), if that helps.

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  • How to get linux to stop asking "There are # rows, list them anyway? [n/y]" for auto-completing

    - by Michael
    How do I get tcsh to stop asking if I want to list files in a directory that may have a lot of auto-completes? For example, if I do: xemacs ../"TAB" to get the list of files it asks: There are 371 rows, list them anyway? [n/y] I don't want it to ask this, just list them.. it's getting tiresome. (Or how to at least set the tolerance to a higher number of auto-completes before it asks) Thanks.

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  • Can I rent exclusive time on a powerful server running linux? [closed]

    - by Mark Borgerding
    My company is involved in a proposal that requires speed estimates of our software on a server with the latest & greatest processors. This is not the first time we've been in this situation. The servers themselves are too expensive to buy a new one every time, so we end up extrapolating from what we have. There are so many variables: processor generation & speed, memory speed, memory channels, cache configurations; it makes extrapolation difficult and error-prone. Is there a business that rents time on the newest servers? At least part of the time we'd need exclusive access to an otherwise quiescent system either via ssh shell access or unattended batch jobs. I am not looking for general cloud computing services. I don't need much time on the server, but it needs to be exclusive. And the server needs to be pretty cutting edge for a solid basis of estimate.

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  • Regaining access to Linux server after SSH service dies?

    - by GigaWatt
    I recently ran into an issue with a VPS where the SSH service crashed, leaving me unable to connect to the machine. The other services were up and running; only the SSH service died. I managed to resolve the situation with a reboot from the VPS control panel, but the incident got me thinking: Assuming: I don't have physical access to the machine I have no server control panel access or means of rebooting the server All other system services are still functioning Then how could I recover from the SSH service dying?

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  • How can I undo what I did when I accidentally booted linux host inside itself with VMware?

    - by ThomasGHenry
    Hello, I'm dual booting XP and Kubuntu. I wanted to boot to my existing raw scsi XP partition inside Kubuntu, not a virtual XP instance. I accidentally booted Kubuntu inside itself. I know this is a big mistake, so I interrupted the VM, which saved the state and closed. I rebooted the host and now I can't load the Kubuntu partition at boot time. I get a maintenance shell and the Kubuntu partition is read-only. I am able to boot XP as usual. I removed the HDD and tried to mount it on another computer as an external drive and neither partition (XP or Kubuntu) will be recognized, it just appears to be one device that still mounts and appears empty. From the maintenance shell I can see all the files are still on the Kubuntu partition. How can I undo what I did when I accidentally booted Kubuntu inside itself? Is it a matter of unlocking some files somewhere? how can I do that on a RO filesystem? Thanks!

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  • How do you set the default user in Linux for file creation?

    - by Not a Name
    I want to create a directory, for example: /public/all But I want it so that if you create a file in all, the owner is root, but anyone with access to the /public/all folder can delete/edit/etc the file, just not change the permissions. (I will use a self-created "setx" application to change the execute value if needed.) Reason for this, I don't want you to be able to deny other users write/read access to files in /public/all. I heard setuid on directories doesn't work for that.

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  • Linux Minux 12 Freezes (Gnome 2) - How to go about finding and fixing cause?

    - by AsH
    This freezing issue has been reported by others over the past few months but no clear answer has been provided. Some have attributed it to Banshee or other music players but this is incorrect since I have this problem and never while using anything other than perhaps Firefox. (I am not sure if it is necessarily due to firefox). Logging out and logging back in seems to remedy the problem. However, it would be nice to fix things once and for all. This problem began in the past 3 weeks. I alway have all Mint updates implemented.

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  • How to get scrolling plot in Linux (using command-line tools)?

    - by Vi
    Supposing I have a program that prints lines with data periodically, how can I turn then info them into graphical plot that updates itself each time new line available? $ ./prog 10 44 20 66 30 55 40 58 50 59 55 58 60 77 ^C $ ./prog | scrollingplot Window appears and updates on each line printed: 80| | ---- | ---- ______...__/ | / ----- | - 40| ------------------------------- 10 20 30 40 50 60 # Note that ASCII art-style plot is just for example, # I want simple X window like in mplayer. There are enough tools for static data, but I haven't seen ones for updating data (except of ksysguard).

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  • Limiting network throughput of an already launched process ? (Linux/FreeBSD)

    - by jbdenis
    Hello everybody, is there any utility to limit the network throughput of a process after it has been launched ? Simple example: you note that a user takes all your upload bandwidth using scp and you'd like to limit the rate or decrease the priority of the transfer. I guess i could use a combination of iptables/tc or pf to achieve that, but i was wondering if there is a "one-shot" tool available (like tickle with a --pid option ^^) ? Regards, Jean-Baptiste

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  • Can a Cisco 3550 be used as router?

    - by kubiej21
    I'm not sure if this is the correct place to ask such a question, but I'll give it a shot anyway. If it isn't, let me know, and I'll remove this post. Anyway, very recently I picked up a Cisco 3550 just to play around with networking and to familiarize myself with Cisco's command line configuration due to the fact that I will be working an electrical engineering internship in which I will have to deal with various networking issues (yes, I agree that a CSNA would be much better suited for this task, but since its part of the job requirements, I'm willing to learn about it). What I was wondering, is whether or not my 3550 can act as a router. I know its a L3 switch, but does that mean it can take the place of a router?

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  • What is the potential for a FUSE mount to destabilize a Linux server?

    - by 200_success
    I'm a sysadmin for a multi-user server, where students in our department have shell accounts. One of our users has requested that we install sshfs on it. I'm debating whether it would be wise to install sshfs as suggested. My main concern is whether a FUSE mount could make our server less reliable. In my experience, bad things can happen to servers when an NFS server suddenly becomes unavailable — the load average shoots up, and you might not be able to unmount it cleanly, to the point where a hard reboot might be necessary. If a FUSE-mounted server suddenly disappears, how hard might it be to clean up the mess? Are there any other likely catastrophes or gotchas I should consider? At least with NFS, only root can mount, and we can choose to mount NFS servers that we consider to be reasonably reliable. Let's assume that our users have no hostile intentions, but might do stupid things accidentally. Also, I'm not really worried about the contents of the filesystems they might mount, since our users already have shell access and can copy anything they want to their home directory.

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  • I can't get an IP address from a VirtualBox VM on OSX from some routers (ie Internet cafes)

    - by ezrock
    On OSX 10.7.3, VirtualBox, using bridged adapter. Everything on the networking side works perfectly as expected in some networking environments, like my home router and some cafes. In others, I can't get an IP address over DHCP, and I don't know why. I suspect there is some setting on the router that is preventing me, or I have some issue with my MAC adress. When it's not working, in syslog, I'll see a few DHCPDISCOVER messages as my VM tries to find a DHCP server, and after a while, "No DHCPOFFERS received" And when I go to a "good" router, a simple "service network restart" is all I need to get an IP. Any ideas?

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