Setting up an Oracle ASM disks is rather simple, and the procedure can be easily obtained from here, for example. This is nice and pretty, and works well for most environments. EMC PowerPath creates meta devices which utilize the underlying paths, as mod_scsi sees them in Linux, without hiding them (unlike IBM’s RDAC, for example)….
I have encountered it on several cases. RedHat Linux ES, by default, uses smp kernel which is limited to eight cores, or two sockets. You find out that your multi-socket hardware, with its 16 (or more…) cores show you only the first eight, both by the simple method of running ‘top‘ and then pressing on…
Current servers are way more powerful than we could have imagined before. With quad-core CPUs, even the simple dual-socket servers contain lots of horse-power. Remember our attitude towards CPU power five years ago, and see that we’re way beyond our needs. When modern servers are equipped with at least eight cores, other, non-CPU related issues…
This is not a simple task, as there are few things which should actually happen for it to work. First – the switch port should support vlan tagging (of course, right?) I have used vlan2 for “external” network, and vlan3 for “internal” network. My configuration looks like this: ifcfg-eth0: DEVICE=eth0 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes ISALIAS=no…
dm-multipath is a great tool. Its abilities were proven to me on many occasions, and I’m sure I’m not the only one. NetApp, for example, use it. HP use it as well (a slightly modified version, and still), and it works. A problem I have encountered is as follow – if a single path fails,…
While he would require some ramp-up, this is the new guy in our technical group. He is a newbie, but I’m sure he will grow to be a great technical person, putting his father way behind. Ugly like his dad, but shows a great technical potential
