Discuss April 2014

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172 participants
139 discussions

heavy IO load when working with sparse files (centos 6.4)
by Ron E 31 Mar '15

31 Mar '15

Dear List, We have noticed a variety of reproducible conditions working with sparse files on multiple servers under load with CentOS 6.4. The short story is that processes that read / write sparse files with large "holes" can generate an IO storm. Oddly, this only happens with holes and not with the sections of the files that contain data. We have seen extremely high IO load for example copying a 40 or 80gb sparse file that only has a few gigs of data in it. Attempts to lower the io priority and cpu priority of these processes do not make any measurable difference. (ionice, nice) This has been observed with processes such as: cp rsync sha1sum The server does have to be under some load to reproduce the necessary conditions. The cases we have seen involve servers running 10-30 guests under kvm. Load is in acceptable norms when the processes are run, such as load avg 5-15 on a 24 core (12 core with HT enabled) server. We also verify before starting such a process that the spindle with the file we're working on is not being unduly hammered by another process. These servers have one hardware raid controller each (Dell H700 controller with write cache enabled) and multiple raid arrays (separate sets of physical spindles). Interestingly, the IO storm is not limited to the array / spindles where the sparse file resides but affects all IO on that server. We have looked extensively and not found any account of a similar issue. We have seen this on configurations that are 'plain vanilla' enough to think that this is not something specific to our environment. Wondering if anyone else has seen this and if any suggestions on gathering more data / troubleshooting. We wonder if we've found either a raid controller driver issue, an OS issue or some other such thing. What seems to point in this direction is that even with ionice -c3 which should prevent the process from using IO unless the storage is idle, an io storm which appears to saturate the entire raid bus on a given server can occur. Thanks in advance.

3 3

Centos 6.4 on Xserve, IPMI error
by Arno B 31 Mar '15

31 Mar '15

Hello! I'm trying to install Centos 6.4 64 bit on this Xserve: http://www.everymac.com/systems/apple/xserve/specs/xserve-intel-xeon-2.8-ei… I got a bootloader from: http://blog.christophersmart.com/2009/07/23/linux-on-an-apple-xserve-efi-on… as none of the official Centos releases (full, minimal, network 64 bit) boot on this machine. They all crash when loading the bootx64.conf. I have built a USB stick with a working bootx64.efi, grub.cfg, together with an initrd and a vmlinuz from the isolinux folder. These seem to get me into booting a kernel until something called IPMI is starting to throw errors at me: Console: switching to colour frame buffer device 128x48 fb0: VESA VGA frame buffer device ipmi message handler version 39.2 IPMI System Interface driver. ipmi_si 0000:09:00.4: enable device (0002 -> 0003) ipmi_si 0000:09:00.4: PCI INT C -> GSI 16 (level, low) -> IRQ 16 ipmi_si: Adding PCI-specified kcs state machine ipmi_si 0000:09:00.7: enable device (0000 -> 0003) ipmi_si 0000:09:00.7: PCI INT D -> GSI 17 (level, low) -> IRQ 17 ipmi_si: Adding PCI-specified bt state machine ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90841000, slave address 0x0 irq 16 IRQ 16/ipmi_si: IRQF_DISABLED is not guaranteed on shared IRQs Using irq 16 ipmi: Found new BMC (man_id: 0x00003f, prod_id: 0x0003, dev_id: 0x20) IPMI kcs interface initialized ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90840000, slave address 0x0 irq 17 Refined TSC clocksource calibration: 2792.999 MHz. Switching to clocksource tsc IPMI BT: timeout in XACTION [ B_BUSY ] 1 retries left IPMI BT: timeout in XACTION [ B_BUSY ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) IPMI BT: timeout in XACTION [ B_BUSY H2B ] failed 2 retries, sending error response IPMI: BT reset (takes 5 secs) then the screen goes to black and the machine doesn't respond to anything anymore... Can anyone please help me with this? Maybe just point me in a direction where to find a solution? I've been googling for a few days now without much results... thanks in advance Arno Beekman

2 1

chromium-33.0.1750.152-3.el6
by ngeorgop 24 Sep '14

24 Sep '14

*New version of chromium (33.0.1750.152)*Build by me :-)i686 chromium-33.0.1750.152-3.el6.i686.rpm <https://docs.google.com/file/d/0B9RlkKQB1POSWmFiT0REeG1QS28/> SRPM chromium-33.0.1750.152-3.el6.src.rpm <https://docs.google.com/file/d/0B9RlkKQB1POSQlZ1OUljT3p6U1U/> -- View this message in context: http://centos.1050465.n5.nabble.com/CentOS-chromium-33-0-1750-152-3-el6-tp5… Sent from the CentOS mailing list archive at Nabble.com.

5 6

mixing MX and CNAME
by aurfalien 27 Aug '14

27 Aug '14

Hi, Has any one had problems with mail clients were your DNS is like this; doman.com MX 50 mail.domain.com domain.com MX 100 mail2.domain.com domain.com CNAME www.domain.com -aurf

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RH developer toolset
by Jerry Geis 13 Aug '14

13 Aug '14

I saw an article this morning about the RH developer toolset. basically it includes a couple of packages like PHP python mysql (etc) that are later packages than that included in the released version like a 6.4 for example. So instead of php 5.3 with patches it would be php 5.4 and so on. That is great for a couple packages - but what about more up to date libraries like glib. 6.4 is way behind on glib. Like a couple years behind. Are there any plans in the "toolset" to update core libraries also? Thanks, Jerry

6 6

Mailman 2.1.16 RPMs?
by Robert Heller 14 Jun '14

14 Jun '14

Before I go through the hassle of building it myself I want to know if someone else has built RPMS for Mailman 2.1.16. I *need* to update the version of Mailman on my CentOS 5 server to Mailman 2.1.16 in order to be able to use the from_is_list option to deal with DMARC issues with Yahoo, Aol, and Hotmail. -- Robert Heller -- 978-544-6933 / heller(a)deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments

3 2

Create Virtual Machine via HTTP or FTP
by cbulist＠gmail.com 08 Jun '14

08 Jun '14

Hi, I'm trying to create a Virtual Machine using Network Install mode (I tried HTTP and FTP). The HTTP/FTP server where the installation files are located is the Host Machine. The URL that I'm using is: http://192.168.1.104/inst and the Automatic detect option detects the OS without problem. When the installation starts I got an error: Unable to retrieve http://192.168.1.104/inst/images/install.img I tried different path but I always get the same error. The host machine is a Centos 6.2 (2.6.32.-220.el6.x86_64) I really appreciate any help with this problem. Thanks in advance,

5 7

Samba4 questions
by Steve Campbell 19 May '14

19 May '14

I'm a little new to Samba when used as more than just a simple place to mount a single user to a single share, but we're now getting ready to replace our Netware servers with Samba, and I guess that means Active Directory DC. As I read more and more about this beast, I keep finding pages that indicate the samba4 rpms supplied with the Centos/RH distribution are not the full version and that I should get them from either samba.org or certain other sources that provide complete versions. These pages are a little dated, but not that old. Can anyone provide insight into what they've done in this situation and whether the samba rpms are now full versions? Most of what I have found on the web is dated around when samba4 just came out of beta through a little later. There doesn't seem to be much documentation on this subject on the web or through Amazon, so half of my time is spent searching instead of reading. A good source for reading would be appreciated as well. I can find plenty examples, just not definitive manuals. steve campbell

9 17

Re: [CentOS] Samba4 questions
by Alain Péan 19 May '14

19 May '14

Le 22/04/2014 22:14, Reindl Harald a écrit : >>> not perhaps, for sure >>> >> >>> >>samba-4.1.0-3.el7.x86_64 >>> >>samba-client-4.1.0-3.el7.x86_64 >>> >>samba-common-4.1.0-3.el7.x86_64 >>> >>samba-libs-4.1.0-3.el7.x86_64 >>> >> >> > >> >I notice it is "samba-common-4....", so samba 4 will be the default in RHEL 7, not samba 3.6.x? > samba 3.x is dead > Fedora did the swicth to 4.x long ago > RHEL7 is based on Fedora 19 / Fedora 20 > Thanks for the information. Samba 4 domains are a very different beast than samba 3.x ones (NT4 style). A samba 4 (AD style) includes its own DNS, its own LDAP etc... Alain

4 5

RHEL7 beta discussions?
by Les Mikesell 08 May '14

08 May '14

Where would be an appropriate place to get help with the quirks of RHEL7 beta, particularly GUI usability issues? Gnome3 won't work under x2go, so I'm trying to use KDE but can't believe that anyone actually uses borderless windows where you can't tell where you are clicking near the edges, grey-background terminals or the default font set. So there must be some other themes or a lot that I don't know about it. -- Les Mikesell lesmikesell(a)gmail.com

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Discuss April 2014