Discuss November 2013

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172 discussions

First Time Setting up RAID
by James B. Byrne 15 Nov '13

15 Nov '13

Arch = x86_64 CentOS-6.4 We have a cold server with 32Gb RAM and 8 x 3TB SATA drives mounted in hotswap cells. The intended purpose of this system is as an ERP application and DBMS host. The ERP application will likely eventually have web access but at the moment only dedicated client applications can connect to it. I am researching how to best set this system up for use as a production host employing RAID. I have read the (minimal) documentation respecting RAID on the RedHat site and have found and read a few online guides. Naturally, in my ignorance I have a bunch of questions to ask and I probably have a bunch more that I should but do not know enough yet to ask. >From what I have read it appears that the system disk must use RAID 1 if it uses RAID at all. Is this the case? If so, is there any benefit to be had by taking two of the 8 drives (6Tb) solely to hold the OS and boot partition? Should these two drives be pulled and replaced with two smaller ones or should we bother with RAID for the boot disk at all? Given that one or two drive bays will be given over to the OS what should be the configuration of the remaining six? It appears from what I have read that RAID 5 is the only viable option. It also appears that the amount of storage available on a RAID5 array with N members is N-1/N. I also read that as the number of members increase both latency and the risk of data loss increases. As the amount of disk space we have in this unit (24Tb) is greater than the total storage of all our existing hosts it appears that a RAID5 array of 5 units would leave at least one hot spare in the chassis and two if the OS is put on one disk. Alternatively, the thought comes to mind that we could do a RAID1 with two RAID5 arrays each of which have 3 drives. Whether one would actually want to do that seems to me a bit questionable but it seems to be at least possible. Comments, suggestions, caveats? Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] First Time Setting up RAID
by James B. Byrne 14 Nov '13

14 Nov '13

On Thu, November 14, 2013 12:51, Reindl Harald wrote: > > > Am 14.11.2013 18:23, schrieb James B. Byrne: >> From what I have read it appears that the system disk must use RAID 1 if it >> uses RAID at all. > > no! > > /boot must be RAID1, see below > md0: /boot > md1: / > md2: /data > > [root@srv-rhsoft:~]$ cat /proc/mdstat > Personalities : [raid1] [raid10] > md2 : active raid10 sda3[4] sdb3[3] sdc3[5] sdd3[0] > 3875222528 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU] > bitmap: 4/29 pages [16KB], 65536KB chunk > > md1 : active raid10 sda2[4] sdb2[3] sdc2[5] sdd2[0] > 30716928 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU] > bitmap: 0/1 pages [0KB], 65536KB chunk > > md0 : active raid1 sda1[4] sdb1[3] sdd1[0] sdc1[5] > 511988 blocks super 1.0 [4/4] [UUUU] > So, this is saying, if I read it aright, that one can have multiple RAID arrays spread over the same spindles but each in differing partitions. Is that right? I am just getting started with this so I am trying to fit what I am reading regarding RAID with what I have dealt with in the past, mainly LVM ext3 volumes. So I am doubtless just not getting it in some important way. BTW, I intend to install CentOS-6.4 with software RAID as the eight disks are mounted in the system chassis. As far as I can tell, there is no hardware RAID controller (unless there is one on the MB, in which case SW Raid is likely a better choice anyway. Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Problem with X11 application and Nouveau driver
by Glenn Eychaner 14 Nov '13

14 Nov '13

I have finally received and am configuring my new workstations eith the NVS510 graphics cards, and have run into rather a problem. The X server seems to be loading the NOUVEAU driver properly (based on the contents of Xorg.0.log), but I have one X11 application that doesn't work correctly; it runs as though XSynchronized is always True, even though it's explicitly set to False in the code. In other words, its redraw behavior is god-awful; worse because it auto-redraws once per second for little apparent reason. And some of the windows draw with artifacts if they're covered and uncovered. Any ideas, anyone? I will gladly provide more info on request, but I'm not an expert X11 programmer (worse, this application uses a third party wrapper library). This is definitely new behavior on this new computer (the previous computers, also using the Nouveau driver with GeForce 7600 cards, did not seem to have this behavior). -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Re: [CentOS] NFS hard mount
by Denniston, Todd A CIV NAVSURFWARCENDIV Crane 14 Nov '13

14 Nov '13

> -----Original Message----- > From: Rita [mailto:rmorgan466@gmail.com] > Sent: Tuesday, November 12, 2013 7:22 PM > To: CentOS mailing list > Subject: Re: [CentOS] NFS hard mount > > Yes, unmount the share and error to the client app. > Sounds like you want to have a combination of mounting with the intr flag[1] and use autofs[2] so that the file system is not mounted ALL the time, but not so soft as to loose data all the time. I have seen soft loose data reliably, were in the same environment (and same equipment) hard,intr does not loose data. My experience is that intr is useful in situations where servers go down/have link issues frequently, and autofs with short timeouts (~15s < timeout <~60s) makes those issues even less _visible_. It will not get you an automatic unmount of the share and error to the client app in the case of server down, but it will /allow/ you to terminate the client and unmount as needed IIRC. [1] nfs mounting page with thanks to zGreenfelder https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux… [2] autofs page https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux… > > > On Tue, Nov 12, 2013 at 6:25 PM, John R Pierce <pierce(a)hogranch.com> wrote: > > > On 11/12/2013 3:18 PM, Rita wrote: > > > Is there a tunable to set NFS hard mount time out? For instance, if the > > > server becomes unavailable for extended amount of time, say 1 hour. I > > would > > > like to timeout after 30 secs. > > > > timeout and do what, unmount the share, and error to the client app > > thats trying to do a read(),write(),open(),stat(),etc ? > > > > > > > > -- > > john r pierce 37N 122W > > somewhere on the middle of the left coast > > > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > > > -- > --- Get your facts first, then you can distort them as you please.-- Even when this disclaimer is not here: I am not a contracting officer. I do not have authority to make or modify the terms of any contract.

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CentOS-announce Digest, Vol 105, Issue 8
by centos-announce-request＠centos.org 14 Nov '13

14 Nov '13

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CEBA-2013:1517 CentOS 6 libvirt Update (Johnny Hughes) 2. CEEA-2013:1516 CentOS 6 hpsa Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Wed, 13 Nov 2013 14:40:51 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2013:1517 CentOS 6 libvirt Update To: centos-announce(a)centos.org Message-ID: <20131113144051.GA13713(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2013:1517 Upstream details at : https://rhn.redhat.com/errata/RHBA-2013-1517.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 69eefbd0356841d9bfcbdd55dcf27abf7d2782d9fb739276631b1f78e3524c72 libvirt-0.10.2-18.el6_4.15.i686.rpm b8b6e63923708bb36b276bc0d06e33e8c97f06f0f2d6e444acb50dc3d301aade libvirt-client-0.10.2-18.el6_4.15.i686.rpm 55f16975dc8fe7fdcd1325e2c9784c31b9a4ed48bf56a9712a55f1946e307c56 libvirt-devel-0.10.2-18.el6_4.15.i686.rpm fa2a8e1f173350d464b7ecb572428615158f3c625bd1a489d364cfc9415fe094 libvirt-python-0.10.2-18.el6_4.15.i686.rpm x86_64: a8f7dac16c432b0491217073939472434d0e9a23066b9dd7fc4eee5b7d61aac5 libvirt-0.10.2-18.el6_4.15.x86_64.rpm b8b6e63923708bb36b276bc0d06e33e8c97f06f0f2d6e444acb50dc3d301aade libvirt-client-0.10.2-18.el6_4.15.i686.rpm 2bfd49eb900fe8eeffebe4979ade482a81cf0b7a5f014fce43c539fc2ee2ff2d libvirt-client-0.10.2-18.el6_4.15.x86_64.rpm 55f16975dc8fe7fdcd1325e2c9784c31b9a4ed48bf56a9712a55f1946e307c56 libvirt-devel-0.10.2-18.el6_4.15.i686.rpm 49f4c7bf99ff33b0d40483cff2da7398f8ca829bd9ca87e84e6932fd76b56429 libvirt-devel-0.10.2-18.el6_4.15.x86_64.rpm ddda9892618a0d0d785c42216e40bb0ea59d6e3f49b4b681818b7d1436936f2b libvirt-lock-sanlock-0.10.2-18.el6_4.15.x86_64.rpm 4568330fe6f07ba850b5f7cefd2592af0914b00c3e1dab6e9ae004dadcf60ce9 libvirt-python-0.10.2-18.el6_4.15.x86_64.rpm Source: 21c0cf5a30850bb5c759a56ca617a7c8cbebdebfaadc08adc2281a09ba684cf2 libvirt-0.10.2-18.el6_4.15.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Wed, 13 Nov 2013 14:41:06 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEEA-2013:1516 CentOS 6 hpsa Update To: centos-announce(a)centos.org Message-ID: <20131113144106.GA13790(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Enhancement Advisory 2013:1516 Upstream details at : https://rhn.redhat.com/errata/RHEA-2013-1516.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: ab3c7899340f74c9ab48c0a5738a11b0174382840b62ff0cb09d89a1e0e127c5 kmod-hpsa-3.4.0_1_RH1-1.el6_4.i686.rpm x86_64: ff8ea688947819a10985a76dbec58a550824154780ed1d696a9da2e68772b19b kmod-hpsa-3.4.0_1_RH1-1.el6_4.x86_64.rpm Source: e2ccc0c0f0a2af623615a19238083537e3ccdd45c84aecd205ba10fe4e372388 hpsa-3.4.0_1_RH1-1.el6_4.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 105, Issue 8 ***********************************************

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Tuning MySQL - what's the best place for mysqld parameters?
by Alexander Farber 13 Nov '13

13 Nov '13

Hello CentOS users, for a Wordpress website I have installed mysql-server-5.1.69-1.el6_4.x86_64 and run /usr/bin/mysql_secure_installation on a CentOS 6.4 machine with mucho RAM (32 GB) and I wonder, what would be the best place for the mysqld parameters descibed at http://dev.mysql.com/doc/refman/5.1/en/server-parameters.html mysqld_safe --key_buffer_size=64M --table_open_cache=256 \ --sort_buffer_size=4M --read_buffer_size=1M & Should I just edit the file /etc/init.d/mysqld or is there a better place in CentOS for that (under sysconfig?) Thanks Alex

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strange speed of mkfs Centos vs. Debian
by Götz Reinicke - IT Koordinator 13 Nov '13

13 Nov '13

Hi, I'm testing a storage system and different network settings and I'm faced with a strange phenomen. Doing a mkfs.ext4 on the centos server lasts 11 minutes. The same mkfs.ext4 command on the debian installation is done in 20 seconds. It is formatting a 14 TB 10Gbit ISCSI Target. It is the same server. Centos and debian are installed on different internal harddisks. Any explanations why debian is so f*** fast? Any hint? Regards . Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 82 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzender des Aufsichtsrats: Jürgen Walter MdL Staatssekretär im Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg Geschäftsführer: Prof. Thomas Schadt

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Using CentOS Wordpress rpms
by Max Pyziur 13 Nov '13

13 Nov '13

Greetings, Apologies for my seeming daft naivete. I'm wondering if there any sort of conventions for using Wordpress on CentOS? Generally until now, I have had users install Wordpress from tarballs on a case-by-case basis. This means that you can have several different versions of WordPress operating on a site. With the RPM you have a version that can be consistent across multiple websites on one server. Is this done through the use of symlinks, or is there some other, additional magic that gets put to use. I've done a little searching of the Google genie, but I'm only led to webpages outlining installing Wordpress from tarballs. Much thanks, Max Pyziur pyz(a)brama.com

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NFS hard mount
by Rita 13 Nov '13

13 Nov '13

Is there a tunable to set NFS hard mount time out? For instance, if the server becomes unavailable for extended amount of time, say 1 hour. I would like to timeout after 30 secs. (Soft mount isn't an option, BTW) -- --- Get your facts first, then you can distort them as you please.--

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Scrabble??
by Beartooth 12 Nov '13

12 Nov '13

Does anyone know a way to run a Scrabble program on CentOS? (I realize the obvious existence of Wine and of virtual machines; but my experience with both has been thoroughly unsatisfactory. So I'd much rather get a linux-native app.) There seem to be two proprietary Scrabble programs, one in which you play against the computer, and one in which you play against a remote friend. The latter is what I'm being asked for by Her Who Must Be Obeyed. (I don't play Scrabble.) -- Beartooth Staffwright, Neo-Redneck Not Quite Clueless Power User Remember I have precious (very precious!) little idea where up is.

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Discuss November 2013