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Migration question?
by Carl Boberg 31 Aug '07

31 Aug '07

Hi, Im new in this list and I have recently started a project to migrate all our servers from RHEL to Centos. My question is if anyone have any tips/tricks regarding online migration from RHEL to Centos, especially between ver. 5? I have read most stuff I have found thru Google and the Centos wiki and most migrations have worked fine except the RHEL 5 - Centos 5 migration. Hit a few bumps and lost the rpm db and such... Any tips/pointers/tricks/experiences are welcome. Yes, I know a clean reinstall is the best thing to do. Cheers

3 4

Very slow disk performance on CentOS 4.5
by Alfred von Campe 31 Aug '07

31 Aug '07

I recently moved my CentOS 4.5 disk from a Lenovo ThinkCentre M52 (3.2 GHz Pentium 4) to a Lenovo ThinkCentre M55 (3.4 GHz Core 2 Duo). I had to install the SMP kernel, but other than that everything just worked. I did have an issue with accidentally initializing my /boot partition, but that was my own fault. But the system was not feeling right. Some things just seemed to be slower, but I couldn't put my finger on it. Today, I noticed that disk I/O was very slow to one of the disks (the boot drive, /dev/ hda). It took over 18 minutes to unzip a set of files that used to take just under 2 minutes on the old system. Sure enough, if I copied the files to the second drive (/dev/sda), I was able to unzip them in under 2 minutes again. When I accidentally clobbered the /boot partition, I learned that there were two IDE controllers on this motherboard, which explained why one SATA drive was named /dev/hda and the other SATA drive /dev/ sda. But I find it hard to believe that there would be such a performance difference between the two controllers/drivers/disks. And I know the slow disk worked just fine before I moved it to the new system. Any ideas what could cause a drive to be so slow? Could it be that DMA is disabled on the drive (see the output of hdparm below)? Also, why does hdparm work for one disk but not the other? Thanks for any pointers, Alfred # lspci 00:00.0 Host bridge: Intel Corporation 82Q963/Q965 Memory Controller Hub (rev 02) 00:01.0 PCI bridge: Intel Corporation 82Q963/Q965 PCI Express Root Port (rev 02) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Contoller #4 (rev 02) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02) 00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2) 00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02) 00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA IDE Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02) 00:1f.5 IDE interface: Intel Corporation 82801H (ICH8 Family) 2 port SATA IDE Controller (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7300 GT] (rev a1) 03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5755 Gigabit Ethernet PCI Express (rev 02) 0a:0a.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) 00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA IDE Controller (rev 02) (prog-if 8a [Master SecP PriP]) Subsystem: Lenovo: Unknown device 1011 Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 177 I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at <unassigned> I/O ports at 30d0 [size=16] I/O ports at 30c0 [size=16] Capabilities: [70] Power Management version 3 00:1f.5 IDE interface: Intel Corporation 82801H (ICH8 Family) 2 port SATA IDE Controller (rev 02) (prog-if 85 [Master SecO PriO]) Subsystem: Lenovo: Unknown device 1011 Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 185 I/O ports at 3428 [size=8] I/O ports at 341c [size=4] I/O ports at 3420 [size=8] I/O ports at 3418 [size=4] I/O ports at 30f0 [size=16] I/O ports at 30e0 [size=16] Capabilities: [70] Power Management version 3 # hdparm /dev/hda /dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 24792/255/63, sectors = 203928109056, start = 0 # hdparm /dev/sda /dev/sda: HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device IO_support = 0 (default 16-bit) readonly = 0 (off) readahead = 256 (on) geometry = 9730/255/63, sectors = 80032038912, start = 0

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Re: OT: Suggestions for RAID HW for 2 SATA drives in
by Lanny Marcus 31 Aug '07

31 Aug '07

On 30 August 2007, Scott Silva <ssilva(a)sgvwater.com> wrote: > Message: 57 <snip> > And, learning how to remove/replace > a defective drive is something I should do. > VMWare is a good way to experiment with things like that. Scott: Thank you for that idea! I don't think any of the boxes in our house have boards that permit virtualization (sp?), but possibly the server will support that. Lanny

2 1

rpmsave files and pagasus
by Centos 31 Aug '07

31 Aug '07

Hello I just upgraded Centos, and now doing some post upgarde task to make sure every thing is fine. First of all, it seems upgrade add rpmsave extension to configuration files, which we should copy them back example is /etc/httpd/conf/httpd.conf.rpmsave also what is Pegasus ? there is a lot of rpmsaved in /var/lib/pegasus example : /var/lib/Pegasus/prev_repository_2007-08-30-1188481293.980554182.rpmsave Thanks

2 1

Re: [CentOS] SELinux question - to fix bug in Webmin
by Lanny Marcus 31 Aug '07

31 Aug '07

On 30 August 2007, Kenneth Porter <shiva(a)sewingwitch.com> wrote: > Message: 75 <snip> > You might also want to direct your question to the SELinux people on > their lists: > > <http://www.redhat.com/mailman/listinfo/fedora-selinux-list> > <http://www.nsa.gov/selinux/info/list.cfm> > > (I'm curious to know what the solution is, though, so please follow up > back here with anything you find!) Ken: I looked at the NSA web site. I will ask him if he wants to ask for the information, or, if he wants me to ask for it. I will post back here, if/when I have more information! Lanny

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Re: [CentOS] OT: Suggestions for RAID HW for 2 SATA drives in DellPowerEdge SC
by Lanny Marcus 31 Aug '07

31 Aug '07

On 31 August 2007, Feizhou <feizhou(a)graffiti.net> wrote: > Message: 77 <snip> > Whoa there! > > Hardware raid + battery backed up memory cache in raid 1,10 mode is > hard to beat with software raid and hardware raid offers data > integrity guarantee beyond software raid. > > If you were planning a huge array especially a raid5 array, then > software raid may be better. Hardware RAID cards all come with memory > caches now so their throughput is no longer limited. > > Another route you can go is getting a PCI/PCIe/PCI-X BBU RAM/NVRAM > card to put an external journal on to speed up fsync performance for > filesystems like ext3 over software raid since these cards can go > beyond 1GB of memory unlike hardware raid cards that usually max out > at 256MB. > > Software RAID is also good if you need to be able to transfer the > disks to another box that does not have a hardware raid controller or > the same controller. > Feizhou: THANK YOU! What you wrote is *extremely* helpful (and educational) for me! MUCH appreciated! Lanny

1 0

Re: delay after wrong password
by edf＠riskproof.no-ip.org 31 Aug '07

31 Aug '07

> Hi list > > If a user connect by Console or OpenSSH and type in the wrong > password, I wish to delay the next password prompt. Use case is for > example brute force attacks. > > I played with FAIL_DELAY in login.defs, but without success. > > cheers > Simon > > -- > XMPP: sjolle(a)swissjabber.org try using the PAM method.. http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/sag-pam_faildelay.h… wfm.. ymmv ed

1 0

Re: CentOS Digest, Vol 31, Issue 31
by Rohit Rai 31 Aug '07

31 Aug '07

---------- Forwarded message ---------- From: Phil Schaffner <Philip.R.Schaffner(a)NASA.gov> To: CentOS mailing list <centos(a)centos.org> Date: Thu, 30 Aug 2007 10:57:18 -0400 Subject: Re: [CentOS] NFS Question and answers On Thu, 2007-08-30 at 18:38 +0530, Rohit Rai wrote: > HI! Friends, > > in followup to my last article regarding my experiences with setting > up CentOS, > taking the advice from Phil, I have written an article dealing with > NFS setup. > > Please visit it at > http://mytechrantings.blogspot.com/2007/08/nfs-network-file-system.html > > The article format is in "Questions and Answers" which I chose so that > It can be a increase Knowledge Base . . . > > Please see to it and tell me what do you think about this format... > And leave any questions in the comment that I might have missed... > And ofcourse you are welcome to put in your thoughts and knowledge in > the topic there :D > > I am planning to write more artciles in this series, already working > on them, one is on YUM setups for LANs and another one is on XEN and > Virt manager. But before I proceed I want to know about the format... > will this Q&A format be appealing enough??? > > Kind Regards, > Rohit Rai I still think joining http://lists.centos.org/mailman/listinfo/centos-docs and contributing to the Wiki would better serve this audience. > -- > I am careful not to confuse excellence with perfection. > Excellence, I can reach for; perfection is God's business. > - Michael J. Fox An excellent start. With regard to firewalls, a simpler if less-secure approach it to open the firewall to trusted machines on the local net. Might want to address the "insecure" parameter in /etc/exports for those using NAT. Fixing a few typos ("variou configuration" "But bere is") would take you a bit further down the road in an asymptotic approach toward perfection. :-) Regards, Phil Hi! Phil, I joined in the list and am waiting for the first digest to get a feel of it. I somehow just felt that making the article over my blog and then once I feel it is complete, submitting it to the documentation will be much easier for me to keep a track of things. Generally I tend to miss out quite a few mails in these lists... :( Thanks for the correntions. Also I have added a long list of options that are available for use in /etc/exports. I am not sure how insecure affects NAT users. I am no Linux guru, though I have been using it since 6-7 years now, I am much more a enthusiast than a pro... That is one reason I am interested in getting sufficient and right document in place. Though we have lot of document it is very scattered, so I am playing my part as much as I can to get a consolidated documentation in CentOS and Fedora. Kind regards, Rohit

1 0

controlling module load order
by Jerry Geis 31 Aug '07

31 Aug '07

Is there a method to control module load order? I want to ensure that the e1000 module loads before the forcedeth driver. Jerry

3 3

Package Tracking System
by Server Gremlin 31 Aug '07

31 Aug '07

Hello CentOS users, Is there any sort of package tracking system for CentOS? I'm used to Debian where I can view a changelog for each *Debian* specific package. This is great because I can see specifically what has been fixed and what known issues remain from release to release in the Debian package, which is subtly different from the upstream release. For instance, I can see what's changed from "apache2.1-debian.deb" to "apache2.2-debian.deb" by using the Debian Package Tracking System. (I'm fudging the package names, but you get the idea). Is there anything like that in CentOS? Thanks, - SG

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