Others just use off-the-shelf distributions and pay consultants to tweak the settings for maximum performance. Red Hat Enterprise Linux is now the dominant Linux distribution among exchanges, Lameter said. Red Hat counts among its customers the Chicago Mercantile Exchange, New York Mercantile Exchange, Frankfurt Stock Exchange, Eurex derivative exchange and Philippine Stock Exchange.
Author Archives: mea
The Five Levels of ISP Evil
This is a serious allegation, but it’s the tip of the iceberg. I’m not sure if everyone understands the levels of sneakiness that service providers can engage in. So, while I’m no expert (as we are an ISP who doesn’t do these things), but as a broad overview, here is my quick guide to the five levels of ISP evil, and the various “opportunities to monetize customers” that we’ve passed on:
via Sonic.net CEO Blog » Blog Archive » The Five Levels of ISP Evil.
Linux CD / DVD Locked and Drive Is Not Opening / Ejecting CD
You might also try disallowing the kernel from locking the cdrom. Sometimes a rogue process will hold onto the drive for no real reason. This way is often much cleaner than killing the process.
# Temporarily unlock the cdrom
echo 0 > /proc/sys/dev/cdrom/lock# Permanently unlock the cdrom
echo “sys.dev.cdrom.lock=0″ >> /etc/sysctl.conf
via Linux CD / DVD Locked and Drive Is Not Opening / Ejecting CD.
Essential VMware ESX Server Troubleshooting Steps
Reassign a vswif to a new vmnic
VMware doesn’t like having two service console connections with different IP addresses in the same subnet, so I have two options.
1. Create a service console connection in a different subnet and access the host from that subnet using the VIclient.
2. Enter the commands directly on the host console.I recommend option two. Keep in mind that this process temporarily disrupts network communications to the host via the service console IP.
After obtaining physical access to the host’s console (or network access via a DRAC or ILO), log in and su – to establish root.
SIMPLE. Unable to network Vsphere in…
SOLVED. I hope this saves someone some time. OK, in ESX non free Vsphere , Bridged networking does not work as in other VM’s. Rather than choosing standard bridged, you have to choose the vmnet0 from the bottom and not bridged. Now it works.
via VMware Communities: SIMPLE. Unable to network Vsphere in….
Arghhhhh! Spent three hours on this… This solution worked although I though I did have the VM originally set to vmnet0 when all the network connectivity weirdness began.
lighttpd fly light
Security, speed, compliance, and flexibility — all of these describe lighttpd (pron. lighty) which is rapidly redefining efficiency of a webserver; as it is designed and optimized for high performance environments. With a small memory footprint compared to other web-servers, effective management of the cpu-load, and advanced feature set (FastCGI, SCGI, Auth, Output-Compression, URL-Rewriting and many more) lighttpd is the perfect solution for every server that is suffering load problems. And best of all it’s Open Source licensed under the revised BSD license.
via lighttpd fly light.
SIP Trunking: A Reality Check
As the conversation developed, we learned there are companies that are not planning, testing and monitoring installations. They are simply putting systems in, getting SIP trunks connected, testing for dial tone and moving onto the next client. Customers are experiencing poor quality, dropped calls and SIP trunks simultaneously dropping then reconnecting. So many problems occurred, the customers simply said, “Enough is enough! Let’s rip everything out and go back to what works!”
SSH Filesystem
This is a filesystem client based on the SSH File Transfer Protocol. Since most SSH servers already support this protocol it is very easy to set up: i.e. on the server side there’s nothing to do. On the client side mounting the filesystem is as easy as logging into the server with ssh.
The idea of sshfs was taken from the SSHFS filesystem distributed with LUFS, which I found very useful. There were some limitations of that codebase, so I rewrote it. Features of this implementation are:
- Based on FUSE (the best userspace filesystem framework for linux 😉
- Multithreading: more than one request can be on it’s way to the server
- Allowing large reads (max 64k)
- Caching directory contents
via SSH Filesystem.
Linus Torvalds Ditches GNOME 3 For Xfce
Gnome 3 is like re-inventing the car – with no confusing dials on the dashboard, a rear view mirror that pops up when you lean to the left, and the gear shift in the glove box.
Vroom!