Re: [CentOS] Why is irqbalance not balancing?
Maybe this utility will be useful to you. http://www.open-mpi.org/projects/hwloc/ Portable Hardware Locality (hwloc) The Portable Hardware Locality (hwloc) software package provides a portable abstraction (across OS, versions, architectures, ...) of the hierarchical topology of modern architectures, including NUMA memory nodes, sockets, shared caches, cores and simultaneous multithreading. It also gathers various system attributes such as cache and memory information as well as the locality of I/O devices such as network interfaces, InfiniBand HCAs or GPUs. It primarily aims at helping applications with gathering information about modern computing hardware so as to exploit it accordingly and efficiently. The democratization of multicore processors and NUMA architectures leads to the spreading of complex hardware topologies into the whole server world. Nodaways every single cluster node may contain tens of cores, hierarchical caches, and multiple memory nodes, making its topology far from flat. Such complex and hierarchical topologies have strong impact of the application performance. The developer must take hardware affinities into account when trying to exploit the actual hardware performance. (...) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] installing C7 on a laptop with Win7, dual boot
It's not that I use the win7 installation much, but I do want to be able to do so when one of those rare occasions pops up. If your laptop is powerful enough and its processor supports hardware virtualization, you can have both systems running at the same time with almost no speed decrease. There are free virtualization solutions such as Virtual Box. You would instsl C7 and then create a virtual machine for Windows. When you need Windows, just run it in a window. Dual boot is a PITA. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] 1 Gbit/s Ethernet NIC under CentOS
For completeness (since many previous posts have touched on this), we don't use jumbo frames since we have no problem reaching wirespeed with normal 1500 frames. Jumbo frames have advantages other than reaching wirespeed. Its use produces less overhead and in general less CPU utilization. Your network will see less trafic and your CPUs will be free to do other work. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] In the press, once again
May be a little bit off topic, but this gave me hard laugh: http://www.theregister.co.uk/2010/09/24/sysadmin_file_tools/ VERY nice! Thank you for the link! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] CentOS 5.2 with IBM SERVERAID 6i
I need to install CentOS 5.2 on a IBM Server xSeries 226, which comes with a IBM SERVERAID 6i RAID card. I think it is not a true hardware RAID card. I has, nevertheless, an interesting feature: 128MB of cache with battery backup. I launched the CentOS boot DVD and CentOS correctly identified the card and the RAID 5 array as configured by the controller's BIOS. My question now is: what would be the better way to implement RAID 5 on this server? Should I use the detected array and respective driver or should I delete the array and go for Linus Software RAID? If both solutions are in fact Software RAID, is there any particular reason to prefer one of the methods? I know that Linux RAID will create a universal, more compatible array, readable on any Linux machine. But is there some other reason that makes it preferrable to use the SERVERAID driver provided by CentOS? Is it optimized in any way that recommends its use? Will the controller still make use of its cache and battery backup if configured as a plain SCSI controller with Linux Software RAID? I hope that some more experienced list member can ellucidate me on this. Thank you! PS - The machine is powered by a Intel P4 Xeon processor served by 2.5GB of RAM. The disks are 3 IBM 10K rpm SCSI 320 with 73 GB each. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
