Discuss December 2005

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219 participants
328 discussions

Query: Filesystems
by Maciej Żenczykowski 08 Dec '05

08 Dec '05

Hello, Just a few quick, but not very simple questions...: Do any Linux filesystems (besides XFS) support freezing? (ie. in conjuction with LVM snapshots this can allow a mounted filesystem to be frozen [freezing all processes writing to this filesystem] in a valid state (with possibly dangling unlinked files), the device can be snapshotted via LVM, and the original filesystem unfrozen - the snapshot now contains a valid snapshot in time of the original filesystem - with no corruption. Can this (freezing) be used for the root filesystem or other important filesystems? ie. might it cause something vitally important to freeze? Can a snapshotted LVM (the snapshot, not the original filesystem) be modified (I assume snapshots are purely readonly...) - so as to remove the dangling deleted/unlinked files and possibly modify the uuid (I realize there is a nouuid mount option for XFS). And the last question: is there some sort of filesystem which supports generating 'in-filesystem' snapshots (ie. some sort of copy-on-write block semantics applicable both to files and directories combined with both a root rw directory to access current files and a ro /snapshot/YYMMDD-HHMMSS hierarchy to access snapshots from past dates with the possibility of deleting them at will (ie. generate a snapshot every hour, after 24 hours leave only every 6th one, after 7 days leave only dailies, after a month leave only weeklies etc... - much too complicated, but it's easier to get the basic idea across on a larger example - probably organized via cronjob). I realise such a solution would not be foolproof (if the disk goes bad or the filesystem goes haywire it's pretty much useless) so a hard-copy would still need to be maintained (probably via freeze/snapshot/unfreeze/dump it somewhere else) - but this would be useful for the users (the ability to restore past deleted files...) In a way this could possibly be realized via some twidling with rsync (although for space efficiency this would require copy-on-write hardlinks or something like that) but I see no way of doing this without wasting a lot of space (at least 1 copy of the snapshoted filesystem, the rest could probably be hardlinked). And to maintain full R/O status, this would need to be a seperate partition, etc... Any comments/ideas? Cheers, MaZe.

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excluding using up2date?
by Sharon Kimble 08 Dec '05

08 Dec '05

Is it possible to exclude one package from a repo whilst using the up2date icon please? If so, how do I do it? Sharon. -- 13:34:23 up 2 days, 3:23, 3 users, load average: 2.70, 1.92, 1.67 A taste of linux http://www.sharons.org.uk/taste/index.html efever http://www.efever.blogspot.com/ Centos 4.2, KDE 3.4.3-1.0, OpenOffice 2.0 Registered Linux user 334501

3 2

new dell B120 laptop and ehci_hcd
by Jerry Geis 08 Dec '05

08 Dec '05

>/Jerry Geis wrote: />// I am installing 4.2 on the new dell $499 B120 laptop. //>/ Centos installs just fine. however, when rebooting />/ it is starting udev and then says Disabling IRQ#11 and stops. />/ />/ Any ideas on why that would be?? />/ / >/Do you have a USB devices plugged in? I reinstalled CentOS 4.2 on my />/laptop this past weekend. I forgot to unplug my USB mouse during />/installation and had the same "Disabling IRQ 11" stop. I ended up />/unplugging my mouse and restarting the install and then it was very happy. / >/Max / >Nothing but the network is pluged in. >Jerry I was able to boot into the "linux rescue" mode and did more /proc/interrupts and Irq 7,10 and 11 are ehci_hcd. What is going on with the USB that it will not boot in normal mode? Install booted and installed normally, linux rescue booted (although I still saw messages about disabling IRQ #11). I see that same message on a normal boot but it never continues after that... Any ideas, why USB is stopping this laptop from booting? Jerry

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new dell B120 laptop
by Jerry Geis 08 Dec '05

08 Dec '05

I am installing 4.2 on the new dell $499 B120 laptop. Centos installs just fine. however, when rebooting it is starting udev and then says Disabling IRQ#11 and stops. Any ideas on why that would be?? THanks, Jerry

2 1

submount/supermount
by Mario Tadej 08 Dec '05

08 Dec '05

Hello, Does anybody runs supermount or submount or anything else. If yes can describe how did it establish. Thanks in advance Mario Tadej

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x86_64 kernel compilation
by John Logsdon 08 Dec '05

08 Dec '05

If I can squeeze a message between the discussions on security (:-)) I have been trying to compile a kernel on an x86_64 box under CentOS4.1 and now 4.2. The problem is that neither make xconfig or make gconfig work: make gconfig * * Unable to find the GTK+ installation. Please make sure that * the GTK+ 2.0 development package is correctly installed... * You need gtk+-2.0, glib-2.0 and libglade-2.0. * make[1]: *** [scripts/kconfig/.tmp_gtkcheck] Error 1 make: *** [gconfig] Error 2 and a similar message for xconfig: make xconfig HOSTLD scripts/kconfig/qconf /usr/bin/ld: cannot find -lqt collect2: ld returned 1 exit status make[1]: *** [scripts/kconfig/qconf] Error 1 make: *** [xconfig] Error 2 Yet I have the following libraries installed: compat-glibc.i386 1:2.3.2-95.30 installed compat-glibc.x86_64 1:2.3.2-95.30 installed compat-glibc-headers.x86_64 1:2.3.2-95.30 installed glibc.i686 2.3.4-2.13 installed glibc.x86_64 2.3.4-2.13 installed glibc-common.x86_64 2.3.4-2.13 installed glibc-devel.x86_64 2.3.4-2.13 installed glibc-devel.i386 2.3.4-2.13 installed glibc-headers.x86_64 2.3.4-2.13 installed glibc-kernheaders.x86_64 2.4-9.1.98.EL installed glibc-utils.x86_64 2.3.4-2.13 installed gtk+.i386 1:1.2.10-33 installed gtk+.x86_64 1:1.2.10-33.centos4 installed gtk+-devel.x86_64 1:1.2.10-33.centos4 installed gtk-engines.i386 1:0.12-6.el4 installed gtk-engines.x86_64 1:0.12-6.el4 installed gtk2.x86_64 2.4.13-18 installed gtk2.i386 2.4.13-18 installed gtk2-devel.x86_64 2.4.13-18 installed gtk2-engines.x86_64 2.2.0-7.el4 installed gtk2-engines.i386 2.2.0-7.el4 installed libglade2.i386 2.4.0-5 installed libglade2.x86_64 2.4.0-5 installed pygtk2.x86_64 2.4.0-1 installed pygtk2-libglade.x86_64 2.4.0-1 installed Since menuconfig is totally unusable, I am quite stuck. I have regularly compiled on an x86 box with virtually identical installation and I have compared the libraries but can't see what I have missed. The kernel version is 2.6.14.3 which is the latest stable but this happens with older kernels. There have been suggestions of various patches to a makefile which I have tried but to no avail. So I think it may be a library issue. So can anyone with an x86_64 box on which they have successfully compiled a kernel post me their output from: yum list | egrep gtk\|glibc\|glade | grep installed ... or even the complete yum list (privately to save bandwidth!) TIA John John Logsdon "Try to make things as simple Quantex Research Ltd, Manchester UK as possible but not simpler" j.logsdon(a)quantex-research.com a.einstein(a)relativity.org +44(0)161 445 4951/G:+44(0)7717758675 www.quantex-research.com

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Planning Mail Server (with low resources)
by Alain Reguera 08 Dec '05

08 Dec '05

Hello, I'm planning the installation of the school's Mail Server. This is the first time I get in administration. I've been reading about postfix, cyrus and the first page in the guide of HughesJR.com[2] about installing postfix-cyrus, but due my low hardware resources, I ask for suggestions to see If what I need can be done (and|or) stable. Hardware: Pentium III 1.4Ghz 256 RAM 40 GB HD-IDE Soft: CentOS 4.2 Postfix Cyrus-IMAPd MailScanner Spanassassin Partitioning(in MB)[1]: / 1.000 /boot/ 100 /home/ 15.000 /swap/ 512 /tmp/ 500 /usr/ 1.000 /var/ 5.000 /var/log/ 2.000 /var/spool/mail/ 14.800 The server will serve around 2000 students, but only 80(maybe 100) concurrent at time. I would like to make a very basic installation, 'cause as you can see, I am with a very low hardware resources. This host will be mail dedicated. In the near future the hard would be upgraded(maybe a nu computer). Now, I need something to show in a working environment. I'll appreciate any suggestion. I've never been involved in this. I used to program with php, but now, it has been delegated :| to me (chosen between other tasks). Some orientation (and|or) readings will be great too, even while, I'll continue reading about partitioning[3] (think my first step). thanks in advanced for your time. [1] http://www.linuxsa.org.au/tips/disk-partitioning.html [2] http://www.hughesjr.com/content/view/9/30/Guides [3] http://www.tldp.org/HOWTO/Partition/intro.html

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DAG repo problem (continuation)
by Dominik Składanowski 08 Dec '05

08 Dec '05

Hello list. Continuing previous topic: http://lists.centos.org/pipermail/centos/2005-November/015586.html, I would like to ask: anybody has the same problem? Still I can't update this few packages. Regards. -- ____________________________________________________________________ D o m i n i k S k ł a d a n o w s k i

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Tape Device
by Mauricio Merlin 08 Dec '05

08 Dec '05

What module I can run for my IDE Device Tape? In the Debian use modprobe ide_tape Error: FATAL: Module ide_tape not found. Tanks -- Cimed Ind. de Med. Ltda Mauricio Merlin Machado Analista de Suporte Tel. (11)2244-7257

2 1

Samba Server requirement
by Sreenath G 08 Dec '05

08 Dec '05

Hi all, I am using CentOS 4(equivalent to RHEL 4) with Samba Version 3.0.10-1.4E.I have mount a folder(say "//linuxsrv/projectname" in my "/mnt/projectname") from my Development server which is a Debian Sarge box.My requirement is that whenever the Samba server running on Debian Box is restarted,I have to recognize it and unmount the "server folder" and then mount it again or shortly I have to recognize the Samba server status of the Debian box.Is it possible by any configuration editing in /etc/smb.conf or anything like that. Please help me as I am not a Linux guru. -- regards Sreenath.G

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Discuss December 2005