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Re: [CentOS] CPU Limit in Centos
by Valeri Galtsev 21 Nov '15

21 Nov '15

On Sat, November 21, 2015 8:29 am, Edward Ned Harvey (centos) wrote: > A few years ago, I vaguely recall some issue with RHEL needing a special > license or something like that, if you had more than a certain amount of > CPU's or a certain amount of RAM. > > Does Centos work fine for 2 CPU's, 16 cores, 32 threads, and 256 G of ram? > > Centos6 specifically. I have CentOS 6 box with 4 CPUs, 64 CPU cores and 512 GB of RAM... for about two years. Runs great. Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

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FYI for CentOS 6.x Users: FireFox 43+ Requires gtk3
by Tim Evans 21 Nov '15

21 Nov '15

https://www.mozilla.org/en-US/firefox/43.0beta/system-requirements/ -- Tim Evans |5 Chestnut Court 443-394-3864 |Owings Mills, MD 21117

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EL7: Detecting FS errors on XFS while mounted
by Benjamin Smith 20 Nov '15

20 Nov '15

Is there a way of checking an XFS filesystem for clean/dirty status while mounted? One of the checks we've long performed is an FS-level error check. This is *not a full-on fsck*, this is "asking the file system if it noted any problems". This is done while the file system is mounted and "hot". For example, here's how we'd check an ext* partition: # debugfs -R "show_super_stats -h" /dev/md127 | grep -i "Filesystem state" We'd look for "Filesystem state: clean" (or something else if not clean). ZFS also allows for a "hot & mounted" check for dirty file system: # zpool status So far, I've been unsuccessful in finding an equivalent for XFS.

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Linux ate my RAM...
by Kwan Lowe 20 Nov '15

20 Nov '15

Hello everyone, Excuse the title. I'm trying to do something very specific that goes against some common assumptions. I am aware of how Linux uses available memory to cache. This, in almost all cases, is desirable. I've spent years explaining to users how to properly read the free output. I'm now trying to increase VM density on host systems (by host, I mean the physical system, not the underlying guest machines). VMWare can over-allocate memory as long as it's not being used. Because of caching, from VMWare's perspective, all Linux memory is being "used". I am aware of the inherent risks in over-allocation of resources on a VMWare system.This tuning is strictly for development systems where performance and stability are not as critical. The increase in vm density is an acceptable tradeoff. My questions: 1) What options are available in CentOS to limit the page cache? SuSe has vm.pagecache_limit_mb and vm.pagecache_limit_ignore_dirty which, in conjunction with swappiness tweaks, appears to do what I need. 2) Any experience with enabling /sys/kernel/mm/ksm/run on non-KVM workloads? As KSM only applies to non-pagecache memory, it doesn't immediately help me here but could be incrementally useful (https://www.kernel.org/doc/Documentation/vm/ksm.txt) 3) Is there any way to control /proc/sys/vm/drop_caches and limit it to a number of entries or age? Dropping the filesystem cache, though it unmarks those pages, has performance implications. Thanks in advance for any input or links.

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Cannot boot
by Siva Prasad Nath 20 Nov '15

20 Nov '15

Hi, My server not able to boot up. It is hanging after few times. How to repair boot system? I am trying to use grub2-install. Is it necessary to install grub2 on boot device? Please help. Thanks in advance. -- Shiva Prasad Nath 92981134

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Kernell
by Siva Prasad Nath 20 Nov '15

20 Nov '15

Hi, I think during rescue mode we cannot access internet. I thought by installing kernel again will solve my problem. But after deleting I cannot retrieve back kernel and I can see rescue menu only. Please help asap. Thanks in advance. Shiva -- Shiva Prasad Nath 92981134

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Intel SSD
by Birta Levente 20 Nov '15

20 Nov '15

Hi I have a supermicro server, motherboard is with C612 chipset and beside that with LSI3108 raid controller integrated. Two Intel SSD DC S3710 200GB. OS: Centos 7.1 up to date. My problem is that the Intel SSD Data Center Tool (ISDCT) does not recognize the SSD drives when they connected to the standard S-ATA ports on the motherboard, but through the LSI raid controller is working. Does somebody know what could be the problem? I talked to the Intel support and they said the problem is that Centos is not supported OS ... only RHEL 7. But if not supported should not work on the LSI controlled neither. Thanks, -- Levi

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CentOS7 kickstart failed ( no such option: --bytes-per-inode)
by Mihoko.Tanaka＠jp.yokogawa.com 19 Nov '15

19 Nov '15

Dear All, I'm trying to create a kickstart installer. I specified an option --byes-per-inode to 'logvol' command, but I got a message "No such option: --bytes-per-inode" during installation. Does anybody know a solution? The following is the lines for disk partitioning definition specified in my kickstart file. ------------------------- ## ## Disk partitioning information ## part /boot/efi --fstype="efi" --ondisk=sda --size=190 part /boot --fstype="xfs" --ondisk=sda --size=476 part pv.01 --fstype="lvmpv" --ondisk=sda --size=1 --grow volgroup centos --pesize=4096 pv.01 logvol swap --fstype="swap" --size=4096 --name=swap --vgname=centos logvol / --fstype="xfs" --size=9536 --name=root --vgname=centos logvol /var --fstype="xfs" --size=4768 --name=var --vgname=centos logvol /opt --fstype="xfs" --size=25600 --name=opt --vgname=centos logvol /data --fstype="xfs" --size=204800 --name=data --vgname=centos --bytes-per-inode=512 --grow ------------------------- Thank you for your kind support in advance. Best Regards, Mihoko ---- Mihoko Tanaka PA Information Products Sec. PAS Product Managent Dept. Systems Business Division IA Platform Business Headquarters YOKOGAWA Electric Corporation Tel: +81-(0)422-5603 (Ext. 35623) ----- CONFIDENTIAL: This e-mail may contain information that is confidential or otherwise protected from disclosure and intended only for the party to whom it is addressed. If you are not the intended recipient, please notify the sender by return and delete this e-mail. You are hereby formally advised that any unauthorized use, disclosure or copying of this email is strictly prohibited and may be unlawful.

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OT: bareos
by m.roth＠5-cent.us 19 Nov '15

19 Nov '15

Hi, folks, I've got it set up, and it alleges that it's backing up Windows. However, when I try to run a restore for a Windows box, in bconsole, I say restore, then from most recent, then the client, and I want to select files. It builds its directory tree (it says), then tells me it's at c:/ (*Nix, not Win backslash)... and there's nothing there. The fileset stanza says to back up File = "c:/Users" Am I doing something wrong? Do I need a separate template stanza just for Windows? mark

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Any idea how to install PDSH on CentOS 7?
by Julius Lerm 19 Nov '15

19 Nov '15

Does anyone have any idea how to install PDSH on CentOS 7? PDSH seems to be completely missing from EPEL now, for CentOS 7. Is there another repository available where we can get PDSH? Thanks, Julius

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