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extremely slow NFS performance under 6.x [SOLVED]
by m.roth＠5-cent.us 04 Nov '13

04 Nov '13

I've posted here about this a number of times. The other admin I work with had been playing with it recently, with some real problems we'd been having, and this time, with a year or so's more stuff to google, and newer documentation, found the problem. What we'd been seeing: cd to an NFS-mounted directory, and from an NFS-mounted directory, tar -xzvf a 25M or so tar.gz, which unpacks to about 105M. Under CentOS 5, on a local drive, seconds; doing the above, about 35 seconds. Mount options included sync. Under 6.x, from the beginning, it was 6.5 to 7 *minutes*. The result was that we'd been keeping our home directory servers on 5. What he found was the mount option barrier. According to one or two hits I found, googling, it's not clear that 5.x even recognizes this option. From upstream docs, <https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux…>, it's enabled by default, and affects *all* journalled filesystems. Remounting the drive with -o nobarrier, I just NFS mounted an exported directory... and it took 20 seconds. Since most of our systems are all on UPSes, we're not worried about sudden power loss... and my manager did a jig, and we're starting to talk about migrating the rest of our home directory servers.... mark

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Re: [CentOS] yum update --skip-broken failure
by m.roth＠5-cent.us 04 Nov '13

04 Nov '13

ken wrote: > Though I've used it countless times in the past, "yum update > --skip-broken" doesn't work anymore... it doesn't skip over updates which have dependency problems. Is this a known issue? Is there a work-around for it? Has anyone else experienced this? > One thing that provokes that, in my experience, is repos from other repositories, where it's not a dependency on this, but that repo does have it as a dependency. mark

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root password required
by Valeri Shibaev 04 Nov '13

04 Nov '13

Hi, I've lost private key for my instance. So I've generated new Private/Public Keys, Created Image from my instance, and Launched new instance. Now I can ssh to this new instance: but it ask me for root password (which it did not on original instance): It looks like this is problem with MarketPlace AMI I was using originally: CentOS-6-x86_64-20120527-EBS-03-adc4348e-1dc3-41df-b833-e86ba57a33d6-ami-8f9af1e6.1 (ami-83cd5eb9). Any help with fixing this unexpected root password required problem?

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yum update --skip-broken failure
by ken 04 Nov '13

04 Nov '13

Though I've used it countless times in the past, "yum update --skip-broken" doesn't work anymore... it doesn't skip over updates which have dependency problems. Is this a known issue? Is there a work-around for it? Has anyone else experienced this? tnx.

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Converting an installed and configured system into live-cd/dvd
by Rajagopal Swaminathan 04 Nov '13

04 Nov '13

Greetings, Can somebody point me in this direction with some links please? -- Regards, Rajagopal

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update from local repo mirror
by zGreenfelder 04 Nov '13

04 Nov '13

so this may be an odd question, but my google fu seems to be failing me. I've created a local mirror of centos 5 & 6 with various instructions across the net, it seems to be functional, syncs on a regular basis,and is generally usable (I've built machines with kickstart/netboot from it and they seem generally workable). my difficulty comes up when I try to use the local mirror for system updates. if I use the originally installed repo configs and run yum check-update, I get a list of 10-15 RPMs for updates, if I change the repo files, do a yum clean all, comment out mirrorlist and uncommenting/chang baseurl= http://localmirror/path/to/repo and run a check, I get nothing. if I look in localmirror:/path/to/repo and do a find for the version numbers I got as available updates from the remote repositories, I find appropriate files in seemingly reasonably named directory paths. my current best guess is that my repodata/repomd.xml file needs some sort of update/rebuild via the createrepo script, but I can't seem to find the 'right' way to this. does anyone have any pointers? thanks. -- Even the Magic 8 ball has an opinion on email clients: Outlook not so good.

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read-only file system when trying to save files
by Wes James 04 Nov '13

04 Nov '13

I have installed emacs with yum and now I'm trying to create a .emacs file and put some commands in it, but I can't type anything in the emacs buffer. It says the buffer is read-only. I exited emacs and did touch .emacs and I get a message that it can't do that on a read-only file system. I googled around to see why this might be, but I can't see any links on this. Any tips why this might be doing this? I've heard that centos is strict on changes, but I don't know the extent it restricts changes. I followed a page where I did echo 0 >/selinux/enforce . But this is only good until reboot. But shouldn't I be now able to make changes in ~* Thanks, -wes

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Re: [CentOS] [OT] Building a new backup server
by Sorin Srbu 04 Nov '13

04 Nov '13

> -----Original Message----- > From: Reindl Harald [mailto:h.reindl@thelounge.net] > Sent: den 4 november 2013 13:48 > To: CentOS mailing list; Sorin Srbu > Subject: Re: [CentOS] [OT] Building a new backup server > > Am 04.11.2013 13:44, schrieb Sorin Srbu: > > I've come so far as installing Fedora 19 and having it see all the > > hard-drives, but it refuses to create any partition bigger than approx. > > 16 TB with ext4. > > this is notting new and Google would tell it easy > https://www.google.at/search?q=ext4+16TB > > https://ext4.wiki.kernel.org/index.php/Ext4_Howto > > The code to create file systems bigger than 16 TiB is, at the time of > writing > this article, not in any stable release of e2fsprogs. It will be in future > releases. Ah, thanks. I previously read about ext4 and that its max limit was in the Exabyte range, but missed the part about the tools... Let's see if I can't do the custom-thing you link to. Thanks again! -- //Sorin

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Compiling Broadcom netxtreme2-7.6.62 drivers Xen4CentOS
by Ross Annetts 04 Nov '13

04 Nov '13

Having problems compiling Broadcom netxtreme2-7.6.62 drivers using the Xen4CentOS (http://wiki.centos.org/QaWiki/Xen4) kernel: CentOS release 6.4 (Final) 3.4.61-9.el6.centos.alt.x86_64 I had to modify the Makefile's a little to get to pass the validation since it was referring to kernel 3.0 and 3.5 but not 3.4. But after doing this I still had the following problem: # make make -C bnx2/src KVER=3.4.61-9.el6.centos.alt.x86_64 PREFIX= make[1]: Entering directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2-2.78.11/src' make -C /lib/modules/3.4.61-9.el6.centos.alt.x86_64/build SUBDIRS=/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2-2.78.11/src modules make[2]: Entering directory `/usr/src/kernels/3.4.61-9.el6.centos.alt.x86_64' Building modules, stage 2. MODPOST 2 modules make[2]: Leaving directory `/usr/src/kernels/3.4.61-9.el6.centos.alt.x86_64' make[1]: Leaving directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2-2.78.11/src' make -C bnx2x/src KVER=3.4.61-9.el6.centos.alt.x86_64 PREFIX= make[1]: Entering directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2x-1.76.54/src' make[1]: Nothing to be done for `all'. make[1]: Leaving directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2x-1.76.54/src' [ -e bnx2/src/Module.symvers ] && cp -f bnx2/src/Module.symvers bnx2i/driver || /bin/true make -C bnx2i/driver KVER=3.4.61-9.el6.centos.alt.x86_64 PREFIX= make[1]: Entering directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver' make -C /lib/modules/3.4.61-9.el6.centos.alt.x86_64/build SUBDIRS=/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver modules make[2]: Entering directory `/usr/src/kernels/3.4.61-9.el6.centos.alt.x86_64' CC [M] /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.o /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c: In function ‘bnx2i_task_xmit’: /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:1377: error: dereferencing pointer to incomplete type /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c: At top level: /tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.c:2773: warning: initialization from incompatible pointer type make[3]: *** [/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver/bnx2i_iscsi.o] Error 1 make[2]: *** [_module_/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver] Error 2 make[2]: Leaving directory `/usr/src/kernels/3.4.61-9.el6.centos.alt.x86_64' make[1]: *** [iscsibuild] Error 2 make[1]: Leaving directory `/tmp/Server/Linux/Driver/netxtreme2-7.6.62/bnx2i-2.7.6.1d/driver' make: *** [iscsibuild] Error 2 Is there anything I can do about this? The kernel is based on: Linux Kernel 3.4.x (kernel.org long term stable kernel). I have started a thread on Broadcom forums but there has not been a response. Has anyone been able to get them working? Regards, Ross

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6.4 : How to enable epel and the rpmfusions??
by Beartooth 03 Nov '13

03 Nov '13

I've installed 6.4 on an old T30 ThinkPad, and I'm in the midst of setting it up. I can't seem to get an rpm of Pan for it, nor even to do yum update. Mousing around fedoraproject eventually got me to http:// rpmfusion.org/Configuration/ and from there to downloads for the free, nonfree, and epel packages (along with a caveat that tells you -- *after* you've gotten rpmfusion -- to get epel first :-{ ). The display on the T30 has given trouble recently; while it's working, I tried with packagekit to eliminate the fusions while keeping epel (actually,EPEL; it seems to matter). Packagekit told me that I had to remove the repository configurations along with the fusions -- a thing I'd've done before if I could, whereupon I'd've started over, with EPEL first. I approved that, then tried to refresh my sources in packagekit in order to get the fusions back. This put me through some tedious juggling of non-commutative commands. At the end of them, despite a lot of fussing with packagekit and some logging in and out, plus a reboot or two, I was still getting error messages like these for yum install pan *and* yum update : [root@T30 ~]# yum install pan Loaded plugins: aliases, changelog, downloadonly, fastestmirror, kabi, presto, refresh-packagekit, security, tmprepo, verify, versionlock Loading support for CentOS kernel ABI Loading mirror speeds from cached hostfile epel/metalink | 14 kB 00:00 * base: mirrors.serveraxis.net * c6-media: * centosplus: mirror.es.its.nyu.edu * contrib: mirror.raystedman.net * epel: mirror.us.leaseweb.net * extras: mirrors.finalasp.com * rpmfusion-free-updates: mirror.us.leaseweb.net * rpmfusion-nonfree-updates: mirror.us.leaseweb.net * updates: centos.mirrors.tds.net file:///media/CentOS/repodata/repomd.xml: [Errno 14] Could not open/read file:///media/CentOS/repodata/repomd.xml Trying other mirror. file:///media/cdrecorder/repodata/repomd.xml: [Errno 14] Could not open/ read file:///media/cdrecorder/repodata/repomd.xml Trying other mirror. file:///media/cdrom/repodata/repomd.xml: [Errno 14] Could not open/read file:///media/cdrom/repodata/repomd.xml Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: c6-media. Please verify its path and try again [root@T30 ~]# I should probably mention that, when I launch packagekit, go to System and then to Software Sources, everything from CentOS-6-Base to CentOS-6-Updates is already checked *except* the one for media. Trying to fix that has been an exercise in futility -- I haven't found a way to tell it anything to use as c6-media. (It won't accept an x in the apposite box.) As root, I got to ///media on another machine as well as on the T30, and both are empty. (The other machine won't install Pan either; but it does do yum update.) Clue, please? Pretty please?? -- Beartooth Staffwright, Neo-Redneck Not Quite Clueless Power User Remember I have precious (very precious!) little idea where up is.

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