Discuss September 2013

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139 participants
129 discussions

Best configuration for encrypted software RAID 1?
by Dave Johansen 10 Oct '13

10 Oct '13

I'm setting up a computer with CentOS 6.4 and a mirrored software RAID. I would like it to be encrypted so I was wondering what the best configuration is. The only info I could find is http://lists.centos.org/pipermail/centos-docs/2008-October/001912.html but it appears to be a bit old and the info on the wiki ( http://wiki.centos.org/HowTos/EncryptTmpSwapHome ) doesn't seem to address RAIDs. My main question is will it be better to encrypt the RAID itself or the two partitions used by the RAID? Any other things I should be aware of? Thanks, Dave

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Weird netinstall issue
by Phil Dobbin 01 Oct '13

01 Oct '13

Hi. The other day I burnt a copy of a CentOS 6.4 64 bit netinstall disc, verified the disc which passed & about a third of the way through the install it informed me that there was no CD in the drive & refused to carry on. So I burnt another & the same thing happened. So using the same disk burner & the same batch of disks, I burnt a copy of a Debian 7.1 netinstall & it installed perfectly. Any thoughts gladly welcome (the CentOS disc was downloaded from the CentOS repos). Cheers, Phil... -- currently (ab)using Arch Linux, CentOS 5.9 & 6.4, Debian Squeeze & Wheezy, Fedora Spherical & That Damn Cat, Lubuntu 12.10, OS X Snow Leopard & Tiger, Ubuntu Quantal, Raring & Saucy GnuGPG Key : http://phildobbin.org/publickey.asc

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SysRq over usb serial adapters
by Billy Crook 01 Oct '13

01 Oct '13

I am having trouble sending sysrq commands over USB serial, and I'm not sure what else to check. I have two identical machines, each with usb-to-serial adapters, joined by a null modem adapter. One runs an agetty, the other minicom. I can log in over the agetty as a user and it works as expected, until I try to send a sysrq. To send a break in minicom, I type [Ctrl]+[a] then [f]. Then I type the character [m] to do a test. I expect to see memory information print to screen, or at least show up in dmesg. Instead I only see the letter m on my shell. I'm using 115200, 8N1, VT102. I can echo m > /proc/sysctl-trigger, and dmesg shows that the sysrq was received when initiated via the procfs interface. But not over serial, and that's what I need. -- Billy Crook • Network and Security Administrator • RiskAnalytics, LLC

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Linux tool to check random I/O performance
by mcclnx mcc 01 Oct '13

01 Oct '13

we just purchase new I/O card and like to check I/O performance. for sequence I/O performance test we can use "hdparm -t /dev/xxx" bur for random I/O performance test which Linux command I can use? ** our environment does NOT allow install third party software.. Thanks

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Anyone using CentOS Active Directory like system?
by Tennant, Jacob 30 Sep '13

30 Sep '13

I am the IT Development Specialist for a small community college and our CIO has asked me to explore an alternative to Microsoft Active Directory as we are separating from our parent university and funding is tight so we were looking into CentOS with 389 Directory Server. Any advise or suggestions would be very helpful. Jacob Tennant

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New Mirror MO, USA
by compevo communications - Domain Administration 30 Sep '13

30 Sep '13

We use CentOS frequently along with many clients so thought it would be a great idea to setup a mirror. http://mirror.compevo.com/centos/ - compevo communications - http://compevo.com The mirror will sync multiple times daily. Thanks to the CentOS team for their contributions and efforts! Phone: +1-604-484-9873 Toll Free (North America) 1-877-347-5238 compevo communications - http://compevo.com

1 0

dmesg and syslog errors in CentOS 6.4 on Dell R720 server
by Kaushal Shriyan 30 Sep '13

30 Sep '13

Hi, I have updated the firmware for perc raid controller card, network card, IDRAC firmware and the BIOS version on Dell R720 server. I have installed CentOS 6.4 and updated with all the latest packages using yum -y update. # cat /var/log/messages | grep -i error Sep 23 14:09:35 x24 kernel: ERST: Error Record Serialization Table (ERST) support is initialized. Sep 23 14:09:35 x24 kernel: ACPI Error: No handler for Region [SYSI] (ffff88042a7af420) [IPMI] (20090903/evregion-319) Sep 23 14:09:35 x24 kernel: ACPI Error: Region IPMI(7) has no handler (20090903/exfldio-295) Sep 23 14:09:35 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88042a7ac8d0), AE_NOT_EXIST Sep 23 14:09:35 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88042a7ac920), AE_NOT_EXIST Sep 23 14:19:19 x24 /etc/sysconfig/network-scripts/ifup-eth: Error adding address 192.168.75.75 for bond0. Sep 23 14:41:07 x24 kernel: php-fpm[5573]: segfault at 6f6d2e636269 ip 00006f6d2e636269 sp 00007fff7481a7e8 error 14 in xcache (deleted)[7f4fe9208000+20000000] Sep 23 14:45:09 x24 kernel: ERST: Error Record Serialization Table (ERST) support is initialized. Sep 23 14:45:09 x24 kernel: ACPI Error: No handler for Region [SYSI] (ffff88042a7af420) [IPMI] (20090903/evregion-319) Sep 23 14:45:09 x24 kernel: ACPI Error: Region IPMI(7) has no handler (20090903/exfldio-295) Sep 23 14:45:09 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88042a7ac8d0), AE_NOT_EXIST Sep 23 14:45:09 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88042a7ac920), AE_NOT_EXIST Sep 23 15:32:44 x24 kernel: php-fpm[6048]: segfault at 1dc8fd0 ip 0000000001dc8fd0 sp 00007fff781bfec8 error 15 Sep 23 15:35:17 x24 kernel: ERST: Error Record Serialization Table (ERST) support is initialized. Sep 23 15:35:17 x24 kernel: ACPI Error: No handler for Region [SYSI] (ffff88042a7af420) [IPMI] (20090903/evregion-319) Sep 23 15:35:17 x24 kernel: ACPI Error: Region IPMI(7) has no handler (20090903/exfldio-295) Sep 23 15:35:17 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88042a7ac8d0), AE_NOT_EXIST Sep 23 15:35:17 x24 kernel: ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88042a7ac920), AE_NOT_EXIST # cat dmesg* | grep -i error ERST: Error Record Serialization Table (ERST) support is initialized. ACPI Error: No handler for Region [SYSI] (ffff88042a7af420) [IPMI] (20090903/evregion-319) ACPI Error: Region IPMI(7) has no handler (20090903/exfldio-295) ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88042a7ac8d0), AE_NOT_EXIST ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88042a7ac920), AE_NOT_EXIST ERST: Error Record Serialization Table (ERST) support is initialized. ACPI Error: No handler for Region [SYSI] (ffff88042a7af420) [IPMI] (20090903/evregion-319) ACPI Error: Region IPMI(7) has no handler (20090903/exfldio-295) ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88042a7ac8d0), AE_NOT_EXIST ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88042a7ac920), AE_NOT_EXIST # uname -r 2.6.32-358.18.1.el6.x86_64 # cat /etc/centos-release CentOS release 6.4 (Final) # cat /etc/redhat-release CentOS release 6.4 (Final) # Hi Kaushal, Thank you for sharing the DSET report with us, we have analyzed the report and found no hardware issue Hardware log : Health status of server: Storage information not yet capture on DSET report Dell highly recommended to keep all firmware up-to-date for stable conditions. Please check *Fixes & Enhancements ()*before* *downloading the any firmware* * Kindly download the below links and update firmware to latest from below order Please follow the below order for updating firmware to latest . 1. Clear Error logs 2. *Have Scheduled Downtime with complete data backup*. 3. Restart once before updating driver, firmware and check for server normal operation. 4. Update Firmware as per the *order below*, after each update have Restart Note : use OMSA live for updating the firmware latest 1. iDRAC Firmware : http://www.dell.com/support/drivers/in/en/inlca1/DriverDetails/Product/powe… 2. network Firmware : http://www.dell.com/support/drivers/in/en/inlca1/DriverDetails/Product/powe… 3. Raid controller firmware : http://www.dell.com/support/drivers/in/en/inlca1/DriverDetails/Product/powe… Kindly involve O/S vendor to analyzing on O/S level Dear Kaushal, Please find the current firmware version. *Firmware Information* *Name* *Version* ** ** Power Supply.Slot.1 07.2B.7D Power Supply.Slot.2 07.2B.7D Integrated Dell Remote Access Controller 1.37.35 Lifecycle Controller 2, 1.0.8.42, A00 1.0.8.42 Enterprise UEFI Diagnostics, 4217A5, 4217.8 4217A5 Dell OS Drivers Pack, 7.1.0.9, A00 7.1.0.9 System CPLD 1.0.3 Broadcom Gigabit Ethernet BCM5720 - E0:DB:55:05:D2:9A 7.4.8 Broadcom Gigabit Ethernet BCM5720 - E0:DB:55:05:D2:9B 7.4.8 Broadcom Gigabit Ethernet BCM5720 - E0:DB:55:05:D2:98 7.4.8 Broadcom Gigabit Ethernet BCM5720 - E0:DB:55:05:D2:99 7.4.8 BIOS 1.6.0 PERC H710 Mini 21.1.0-0007 BP12G+ 0:1 1.00 Team, As per the DSET report, Current iDRAC firmware is Network Firmware version is RAID controller firmware is Any clue to the above dmesg and syslog errors? Let me know if anyone needs additional information or any details of configuration files. Regards, Kaushal

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ghostscript-8.70-14.el5_8.1.x86_64 & hylafax+ 5.5.3
by Gregory P. Ennis 30 Sep '13

30 Sep '13

I am having some problems with hylafax+ on CentOS 5.9 converting files into appropriate tiff files that are faxable; the problem is apparently fixed in ghostscript 9.07. The CentOS repositories currently have ghostscript-8.70-14.el5_8.1.x86_64 I surely appreciate the maintainers of the repositories; can any of you direct me to whom maintains ghostscript on the repository or when 9.07 is planned to be included. I would also like to request that ghostpcl be included, but I am not certain who or how to ask. Thanks for your assistance. Greg Ennis

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Intel 10G X520-2 and iscsi storage poor performance
by Götz Reinicke - IT Koordinator 30 Sep '13

30 Sep '13

Hi, we have a storageserver (Centos 6.4) with a dualport Intel 10G X520-2 Adapter. A QSan P600Q-D316 Storage is configured with 8*SATA Drives raid 5 for test, connected trought a Cisco UCS 6100 Series Fabric Interconnect 10G Switch. I formated the storage with ext4 defaults, one volume and got r/w rates about 10MB/s some up to 40MB/s .... VERY POOR.... So we returned the storage to our dealer and they tested the hardware and did some IO Meter Test with VMware ESXi 5.1 Server -> virtual Windows 2k8-R2 on the Qsan Storage. The VM did some r/w IO Meter Benchmark up to 1000 MB/Sec. Better. Hardware looks o.k. Than they installed a Windows 2k8-R2 server and attached the QSAN. The r/w speed is about 400-500 MB/s. After that the dealer installed a Centos 6.4 as I did and the r/w performance is back to our results .... up to 40MB/s .... What the hell? Are the default driver and settings so bad? I know and researched a lot of tuning options like buffers, new drivers etc. We did not check that for now, but are'nt there some defalut values and settings which apply as well to be much faster? Or in other words, are some realy simple hints and suggestions to a) debug / find the bottleneck and b) to increase the performance to the same level as windows? Thanks a lot for any help and feedback . 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

3 3

erase disk
by Phil Dobbin 29 Sep '13

29 Sep '13

Hi. I have a CentOS server (a Dell 860) with two drives in it. One is running CentOS 6.4 which I want to keep & the bigger 400GB drive has Debian 7 on it which I want to erase & use for backups. Which is the best way to go about achieving my intended goal? The Debian drive is not mounted when Centos is booted. Any help appreciated. Cheers, Phil... -- currently (ab)using Arch Linux, CentOS 5.9 & 6.4, Debian Squeeze & Wheezy, Fedora Spherical & That Damn Cat, Lubuntu 12.10, OS X Snow Leopard & Tiger, Ubuntu Quantal, Raring & Saucy GnuGPG Key : http://phildobbin.org/publickey.asc

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Discuss September 2013