Mac ZFS Source Code Released

Posted on in Categories Download of the day, OS X, Solaris, Sys admin, Tips, UNIX last updated January 14, 2008

ZFS has amazing feature set and now it is ported to Mac

ZFS file system developed by Sun for its UNIX operating system. ZFS presents a pooled storage model that completely eliminates the concept of volumes and the associated problems of partitions, provisioning, wasted bandwidth and stranded storage. Thousands of filesystems can draw from a common storage pool, each one consuming only as much space as it actually needs. The combined I/O bandwidth of all devices in the pool is available to all filesystems at all times.

Apple has ported ZFS from Open Solaris to the Mac OS X platform. You can download ZFS beta version here (via ./).

Linux Fibre Channel over Ethernet implementation code released

Posted on in Categories Linux, Linux Scalability, Linux Virtualization, Networking, Open source coding, Storage last updated December 18, 2007

Intel has just released source code for Fibre Channel over Ethernet (FCoE). It provides some Fibre Channel protocol processing as well as the encapsulation of FC frames within Ethernet packets. FCoE will allow systems with an Ethernet adapter and a Fibre Channel Forwarder to login to a Fibre Channel fabric (the FCF is a “gateway” that bridges the LAN and the SAN). That fabric login was previously reserved exclusively for Fibre Channel HBAs. This technology reduces complexity in the data center by aiding network convergence. It is targeted for 10Gps Ethernet NICs but will work on any Ethernet NIC supporting pause frames. Intel will provide a Fibre Channel protocol processing module as well as an Ethernet based transport module. The Open-FC module acts as a LLD for SCSI and the Open-FCoE transport uses net_device to send and receive packets.

This is good news. I think one can compare bandwidth and throughput for copper and fiber Ethernet. If you are going to use copper you need to stay within 15m of the switch. This solution will try to bring down cost. One can connect to 8-10 server to central database server with 10G and there could be few more applications.

=> Open FCoE project home page

Measure Network Performance: Find Bandwidth, Jitter, Datagram Loss With Iperf

Posted on in Categories Howto, Linux, Networking, Sys admin, Troubleshooting, UNIX, Windows, Windows server last updated August 22, 2010

Typically, your user sends network throughput problems reports as they see problem with their applications such as:

[a] FTP Transfer

[b] NFS Performance

[c] HTTP / SMTP / POP3 etc

As a sys admin you should able confirm the throughput problem. iperf is the tool you are looking to find out:

a) Network throughput problem

b) Packet loss problem

c) Datagram loss

d) Delay jitter

From the man page:

iperf is a tool to measure maximum TCP bandwidth, allowing the tuning of various parameters and UDP characteristics.

iperf works on client / server model. You need to install iperf on both client computer and server computer to measure network performance between two nodes.

Continue reading “Measure Network Performance: Find Bandwidth, Jitter, Datagram Loss With Iperf”