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mirroring with lftp
by John R Pierce 28 Jun '11

28 Jun '11

i've maintained a local centos repository at work using rsync, but it seems the corp honchos have decided to block rsync at our firewall, plus its never been 100% reliable, I'd get aborts on protocol errors sometimes several times before pulling down a complete new distro update. i'm trying to figure out how to do this with lftp, and its got me somewhat stymied. I'm testing with --dry-run like... lftp -c 'open http://mirrors.kernel.org/centos/ && mirror -c -X \*/ia64 -X \*/s390 -X \*/alpha -X \*/SRPMS --dry-run' but my -X excludes don't seem to work (I don't want/need itanium, s390, alpha, or SRPMs in my repo). and, it doesn't seem to be aware of the symlinks from, for example, /5/ to /5.6/ and seems to want to pull down two copies instead (I understand that http doesn't make symlinks obvious). Should I use ftp:// instead of http:// or something? does someone have a script for maintaining a repo with lftp they'd like to share? what I saw on the wiki wasn't very helpful. -- john r pierce N 37, W 122 santa cruz ca mid-left coast

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how do determine last file system on disk?
by Rudi Ahlers 27 Jun '11

27 Jun '11

Hi all, Does anyone know how to determine which file system a disk was formatted with, if fdisk -l doesn't show it? usb-storage: device found at 5 usb-storage: waiting for device to settle before scanning Vendor: Model: Rev: Type: Direct-Access ANSI SCSI revision: 02 sd 7:0:0:0: Attached scsi disk sda sd 7:0:0:0: Attached scsi generic sg0 type 0 usb-storage: device scan complete usb 1-4: USB disconnect, address 5 usb 1-4: new high speed USB device using ehci_hcd and address 6 usb 1-4: configuration #1 chosen from 1 choice scsi8 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 6 usb-storage: waiting for device to settle before scanning Vendor: Model: Rev: Type: Direct-Access ANSI SCSI revision: 02 sd 8:0:0:0: Attached scsi disk sda sd 8:0:0:0: Attached scsi generic sg0 type 0 usb-storage: device scan complete [root@HP-DL360 ~]# fdisk -l /dev/sda [root@HP-DL360 ~]# I need to see what data is on a bunch of disks that I found in storage and would prefer to first check if there's anything of use on them before I format them -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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libv4l question
by Jerry Geis 27 Jun '11

27 Jun '11

Hi all, Hey I'm trying to do some web cam stuff, and I found this link: http://freshmeat.net/projects/libv4l/releases/333037 I was doing the "rpm -qa | grep v4l" and nothing comes up, I did "ls path_to_centos/RPMS/* | grep v4l " and nothing comes up, I did 'yum provides "*/libv4l*"' and nothing comes up. Is the CentOS library for v4l named something different? Is this library something I can just grab and compile and "help" with my v4l efforts? Do I not need this library at all? I'm using 5.6 x86_64. Just a little confused at the moment. Thanks, Jerry

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Latest kernel produces kernel error on Dell R200 on boot-up
by Kai Schaetzl 27 Jun '11

27 Jun '11

I accidentally noticed this error written to the warn log on my Dell R200's when the machines booted up after latest kernel update. Google doesn't have this exact error, only a few with differently named devices, but all seem to have to do with USB. Could this be a bug? Didn't see this error on other machines with more than one USB port, though. Jun 26 22:59:07 c4 kernel: kobject_add failed for usbdev1.2_ep81 with - EEXIST, don't try to register things with the same name in the same directory. Jun 26 22:59:07 c4 kernel: Jun 26 22:59:07 c4 kernel: Call Trace: Jun 26 22:59:07 c4 kernel: [<ffffffff803457a0>] kobject_add+0x166/0x191 Jun 26 22:59:07 c4 kernel: [<ffffffff803af893>] device_add+0x85/0x372 Jun 26 22:59:07 c4 kernel: [<ffffffff803f03f6>] usb_create_ep_files+0x137/0x19a Jun 26 22:59:07 c4 kernel: [<ffffffff80478406>] klist_add_tail+0x35/0x42 Jun 26 22:59:07 c4 kernel: [<ffffffff803efe92>] usb_create_sysfs_intf_files+0x80/0x93 Jun 26 22:59:07 c4 kernel: [<ffffffff803ed710>] usb_set_configuration+0x3aa/0x3d9 Jun 26 22:59:07 c4 kernel: [<ffffffff803e9408>] usb_new_device+0x253/0x2c4 Jun 26 22:59:07 c4 kernel: [<ffffffff803ea554>] hub_thread+0x74e/0xb11 Jun 26 22:59:07 c4 kernel: [<ffffffff8029e04c>] autoremove_wake_function+0x0/0x2e Jun 26 22:59:07 c4 kernel: [<ffffffff803e9e06>] hub_thread+0x0/0xb11 Jun 26 22:59:07 c4 kernel: [<ffffffff8029de34>] keventd_create_kthread+0x0/0xc4 Jun 26 22:59:07 c4 kernel: [<ffffffff80233dee>] kthread+0xfe/0x132 Jun 26 22:59:07 c4 kernel: [<ffffffff80260b2c>] child_rip+0xa/0x12 Jun 26 22:59:07 c4 kernel: [<ffffffff8029de34>] keventd_create_kthread+0x0/0xc4 Jun 26 22:59:07 c4 kernel: [<ffffffff80233cf0>] kthread+0x0/0x132 Jun 26 22:59:07 c4 kernel: [<ffffffff80260b22>] child_rip+0x0/0x12 Kai

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HP Network Printer
by Gene Poole 27 Jun '11

27 Jun '11

I'm attempting to install and configure HPLIP (HP Linux Imaging and Printing) software on my CentOS 5.3 x86_64 system without success. I've got a HP Officejet Pro 8500 multi-function printer connected via ethernet. I'm getting a message saying that it cannot locate the libcups module in the /usr/lib64 and /usr/lib directories. However, I can locate then correct modules using the find command. I can print to this printer using multiple versions of Fedora and multiple versions of Windows. Does anyone have any suggestions why it is not working? Thanks, Gene Poole

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CentOS-6 Status updates
by James B. Byrne 27 Jun '11

27 Jun '11

I just want to say that I really, really, appreciate the information given on this site: http://qaweb.dev.centos.org/qa/calendar -- *** 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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[SPAM] Employee Needed
by Scott McClanahan 27 Jun '11

27 Jun '11

Hey guys we are looking for an addition to our very small sys admin team. We want somebody who either knows the [O/S, server, network, storage arena inside & out] OR [systems automation (chef, puppet), virtualization, python, ruby]. Either slot filled would allow me to focus more on the other. Please head over to: http://www.rayjobs.com/index.cfm?NavID=103 And search with this job req: 17135BR It's with Raytheon but I can assure it resembles nothing even close to Raytheon. Very startup culture & very exciting work. Relocation assist. provided & if you think you are a seriously bad ass SA please reach out to me. -- Scott McClanahan W: 321-253-7892

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How do I Install and activate?
by John J. Boyer 27 Jun '11

27 Jun '11

I have just installed CentOS 5.6 from disk and updated it. 1. I would like to use telnet on my local network. How do I activate it? 2. How do I install Mercurial? it is not in the repository. 3. How do I install eclipse? It is also not in the repository. Thanks, John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities

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unofficial ext3 and ext4 compare
by Jerry Geis 27 Jun '11

27 Jun '11

I have something like 300G I routinely backup. This includes some large 12Gig images and other files. I had been using ext3 on an external USB disk for part of the process. Under ext3 doing "rsync -a /home /mnt/external_back/backup.jun.27.2011" it took 200 minutes. I took the same computer, same external HD and reformatted it for ext4 (mkfs.ext4 /dev/sdd1). I then started the same rsync as above. The time was reduced to 170 minutes. This is on Centos 5.6 x86_64. I did notice the [ext4-dio-unwrit] process that starts up. One process for each core. I was concerned when they did not go away. But google says that is normal. :) Jerry

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How many L1/L2 my cpu have ?
by clibup clibup 27 Jun '11

27 Jun '11

Hi Could anybody explain me how to check how many L1/L2 cache my cpu have. I'm using CentOS 5.6 *cat /proc/cpuinfo |grep CPU * model name : Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz model name : Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz Diagram of a generic dual-core processor, with CPU-local level 1 caches, and a shared, on-die level 2 cache. *http://upload.wikimedia.org/wikipedia/commons/e/ec/Dual_Core_Generic.svg* ######################### >From /proc/cpuinfo we see that CPU have 6MB L2 cache, but we see it doubled and it's not true because according Intel specification we know that this CPU have shared L2 cache. *grep 'cache size' /proc/cpuinfo * cache size : 6144 KB cache size : 6144 KB ################################### Here we can see that cpu have 6MiB L2 cache and 64KiB L1 cache *dmesg |grep 'CPU: L' * CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 6144K L2 - true L1 - not true because each CPU core have 64 KiB memory cache (Instruction and Data) ############################################ Into sys directory we can find some information about cache size but again not all information are true L2 - not true L1 - true *cat /sys/devices/system/cpu/cpu*/cache/index*/size * 32K 32K 6144K 32K 32K 6144K ##################################### getconf show information only for one core. *getconf -a |grep CACHE * LEVEL1_ICACHE_SIZE 32768 LEVEL1_DCACHE_SIZE 32768 LEVEL2_CACHE_SIZE 6291456 L1 - 64KiB - not true L2 - 6MiB - true ############################ According the most powerful tool - x86info we can presume that we have: *x86info -c * Found 2 identical CPUs Extended Family: 0 Extended Model: 1 Family: 6 Model: 23 Stepping: 6 Type: 0 (Original OEM) CPU Model (x86info's best guess): Core 2 Duo P8600 Processor name string (BIOS programmed): Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz Cache info L1 Instruction cache: 32KB, 8-way associative. 64 byte line size. L1 Data cache: 32KB, 8-way associative. 64 byte line size. L2 cache: 6MB, 24-way set associative, 64-byte line size. TLB info Instruction TLB: 4x 4MB page entries, or 8x 2MB pages entries, 4-way associative Instruction TLB: 4K pages, 4-way associative, 128 entries. Data TLB: 4MB pages, 4-way associative, 32 entries L1 Data TLB: 4KB pages, 4-way set associative, 16 entries L1 Data TLB: 4MB pages, 4-way set associative, 16 entries Data TLB: 4K pages, 4-way associative, 256 entries. 64 byte prefetching. Total processor threads: 2 This system has 1 dual-core processor running at an estimated 2.50GHz L1 - 128Kib - true L2 - 12 MiB - not true ########################## Output form dmidecode is useless. dmidecode -t processor L1 Cache Handle: 0x0005 L2 Cache Handle: 0x0006 L3 Cache Handle: Not Provided ################################## Is there any tool which can clearly indicate how many L1/L2 cache cpu have. If someone have any idea how to clearly designate L1/L2 cache don't hesitate share your knowledge .. ;) P.S. Sorry for my English ... Regards

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