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Re: [CentOS] Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan
by Tim Nelson 29 Jan '10

29 Jan '10

----- "Jason Pyeron" <jpyeron(a)pdinc.us> wrote: > I have no output in the logs, but /etc/init.d/network restart fixes > the issue. > I am rsync/scp (10GB) data from one 100MB Full duplex host to an ASUS > M3A78-EM > (RTL8111B/C). It locks up around the 1.5GB Tx mark. > If I ethtool -s eth0 autoneg off speed 100 duplex full it does not > happen again. > > Ideas? Part of the problem is that you mention r8169 kernel module in your subject but your hardware is RTL8111B. Realtek drivers are notorious for loading on improper hardware and appearing to work properly. You need to get the proper driver for your NIC. I've run into this countless times with the r8169 driver and non-r8169 Realtek NICs. And, on a side note, Realtek may possibly be the worst NIC out there, especially for server use. It may link at gigabit speed, but I bet a trusty old 3Com or Intel Pro 100 will get better throughput. Install a different NIC as fast as you can and never look back. --Tim

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Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan
by Jason Pyeron 29 Jan '10

29 Jan '10

I have no output in the logs, but /etc/init.d/network restart fixes the issue. I am rsync/scp (10GB) data from one 100MB Full duplex host to an ASUS M3A78-EM (RTL8111B/C). It locks up around the 1.5GB Tx mark. If I ethtool -s eth0 autoneg off speed 100 duplex full it does not happen again. Ideas? -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts
by J.Witvliet＠MINDEF.NL 29 Jan '10

29 Jan '10

At any rate... if I were in your shoes and really restricted to the options you propose, I would go with CIFS mounts through IPSEC tunnels. Wouldn't IPSEC add more overhead than an SSH tunnel? -geoff I would *certainly* not use ssh-tunnels, on a line that is not 100% error free or with high latency. In general tcp-in-tcp tunneling is BAD. One likely gets the infamous snowbal-effect. As ipsec is lower in the protocol-stack (then openvpn) it has probably the lowest overhead. ssh-tunnels are the worst (just nice for a quick tunnel in SOHO-environments) ______________________________________________________________________ Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u niet de geadresseerde bent of dit bericht abusievelijk aan u is toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van welke aard ook, die verband houdt met risico's verbonden aan het elektronisch verzenden van berichten. This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. The State accepts no liability for damage of any kind resulting from the risks inherent in the electronic transmission of messages.

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts
by J.Witvliet＠MINDEF.NL 29 Jan '10

29 Jan '10

________________________________ From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of Rudi Ahlers Sent: Friday, January 29, 2010 12:23 AM To: CentOS mailing list Subject: Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts On Fri, Jan 29, 2010 at 1:18 AM, nate <centos(a)linuxpowered.net<mailto:centos@linuxpowered.net>> wrote: Rudi Ahlers wrote: > nate, why not? Is it simply unavoidable at all costs to mount on system on > another, over a WAN? That's all I really want todo If what you have now works, stick with it.. in general network file systems are very latency sensitive. CIFS might work best *if* your using a WAN optimization appliance, I'm not sure how much support NFS gets from those vendors. iSCSI certainly is the worst, block devices are very intolerant of latency. AFS may be another option though quite a bit more complicated, as far as I know it's a layer on top of an existing file system that is used for things like replication http://www.openafs.org/ I have no experience with it myself. nate _______________________________________________ CentOS mailing list CentOS(a)centos.org<mailto:CentOS@centos.org> http://lists.centos.org/mailman/listinfo/centos Thanx nate, this is what I wanted to hear :) So, is there any benefit in using NFS over SMB in this case? Can't speak for NFS(3/4), but i can tell you that that smb-protocol combined with high latency is a recepy for disaster. We tried it from europe to the carribean (both sat or fibre) but users spent their time more complaining then working. Needed horrible expensive lan-optimesers at both end So perhaps nfs4 or afs (later is intended for geographically separated machines, afaicr) but certainly not smb! ______________________________________________________________________ Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u niet de geadresseerde bent of dit bericht abusievelijk aan u is toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van welke aard ook, die verband houdt met risico's verbonden aan het elektronisch verzenden van berichten. This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. The State accepts no liability for damage of any kind resulting from the risks inherent in the electronic transmission of messages.

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How to map ata#.# numbers to /dev/sd numbers?
by Stephen Harris 29 Jan '10

29 Jan '10

On my C5 machine (a Dell XPS420) I have a 500Gb disk on the internal SATA controller. I also have a SiI3132 dual-port multi-device eSATA card. This is connected to an external SATA array of disks. Now occasionally I see something like this in my logs ata7.01: exception Emask 0x0 SAct 0x0 SErr 0x0 a ction 0x0 ata7.01: irq_stat 0x00060002, device error via D 2H FIS ata7.01: cmd 25/00:08:47:1c:92/00:00:6c:00:00/e0 tag 0 dma 4096 in res 51/40:00:4e:1c:92/00:00:6c:00:00/00 Emask 0x9 (media error) ata7.01: status: { DRDY ERR } ata7.01: error: { UNC } ata7.01: configured for UDMA/100 ata7: EH complete How do I tell what disk this is complaining about? Is there a way to determine what ata7.01 maps to in terms of /dev/sd# values? /proc/scsi/scsi doesn't obviously match scsi# numbers to ata# numbers :-( -- rgds Stephen

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Hibernating a laptop with the power button (Thinkpax X31) under CentOS 5.4
by Robert Heller 29 Jan '10

29 Jan '10

I am having a weird problem trying to get hibernation to work when I press the power button on my Thinkpad X31 under CentOS 5.4. I've modified /etc/acpi/events/power.conf to contain: # ACPID config to power down machine if powerbutton is pressed, but only if # no gnome-power-manager is running event=button/power.* action=/bin/ps awwux | /bin/grep gnome-power-manager | /bin/grep -qv grep || /sbin/shutdown -h now And restarted acpid (sudo /sbin/service acpid restart). I don't run gnome, so there won't be a gnome-power-manager process running. When I press the power button nothing happens (acpid does log that it ran the above action). If I run the action line above in a shell (as root), the machine does hibernate just fine. What is going on here? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

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Centos/Linux Disk Caching, might be OT in some ways
by Noob Centos Admin 29 Jan '10

29 Jan '10

I'm trying to optimize some database app running on a CentOS server and wanted to confirm some things about the disk/file caching mechanism. >From what I've read, Linux has a Virtual Filesystem layer that sits between the physical file system and everything else. So no matter what FS is used, applications are still addressing the VFS. Due to this, disk caching is done on an inode/block basis. I'm assuming that this is still the case in CentOS or am I badly mistaken? If that is correct, then here is my scenario and hypothesis. Assuming the server has xxx MB of free memory and the database consist of several tables more than xxx MB in size. So no table will fit entirely into memory. And assuming other processes do not interfere with the caching behaviour or available memory etc. Given the inode caching behaviour, if the DBMS only access a bunch of inodes that total less than xxx MB, is it therefore likely to be always using the cache, hence faster? My thought is that if this is the case, then I could likely speed up the application behaviour if I further split the tables into parts that are more frequently accessed, and parts that are unlikely touched. e.g. the table may currently have rows with 20 fields and total 1KB/row, but very often say only 5/20 fields are used in actual processing. Reading x rows from this table may access x inodes which would not fit into the cache/memory. However if now I break the table into two parts with those 5 fields into a smaller table, there would be a speed increase since the reading the same x rows from this table would only access 1/x inodes. Further more, these would more likely fit into the disk/memory cache for even faster access. Or would I simply be duplicating what the DBMS's index files would already be doing and therefore see no improvement?

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Installing an SSL Cert
by ML 29 Jan '10

29 Jan '10

HI All, I am considering buying this: http://www.godaddy.com/Compare/gdcompare_ssl.aspx?isc=sslqgo003a Since I have a domain that will be collecting data and processing payments. Where can I find instructions on how to install the certificate? Do I have to run another domain or sub domain for the store? Or can I just run the whole domain on https? Thanks, -Jason

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bind a web root sub-folder to /usr/share/xxyy
by Mr. X 28 Jan '10

28 Jan '10

This is OT, but what is the RH/Centos best practice for this scenario. I have a web root under control of user webmaster. In /etc/fstab ----------- snip ------ /var/www/dev /home/webmaster/www_dev none bind 0 0 --------- unsnip ------ ls -al /var/www/dev/ drwxr-xr-x 10 webmaster webmaster 4096 Jan 28 14:21 dev what I'd like to do is bind /usr/share/xxyy to /var/www/dev/xxyy under control ~webmaster. Is it as simple as /usr/share/xxyy /var/www/dev/xxyy none bind 0 0 do I have chown webmaster:webmaster /usr/share/xxyy ? -- Mark

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Starting a java applet from the desktop
by James B. Byrne 28 Jan '10

28 Jan '10

CentOS-5.4 i86_64 I have a calculator applet on my desktop (superbcalc.jar). When I double click on it I get no response. If I right click and select open with java I get no response. If I open a terminal window and cd to Desktop and type java -jar superbcalc.jar then the applet opens. Does anyone have any idea why I am seeing this behaviour? There are no messages in the syslog file relating to this. -- *** 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 -- *** 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 -- *** 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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