Archive for September, 2007

Compare SATA with SCSI – a point in favor of SCSI

We compared SATA against SCSI previously, but here is another point to consider in favor of SCSI: SCSI is considered faster than SATA because SCSI has processor onboard that is specialized to handle disk read operations, SATA does not. The major reason for choosing/paying for SCSI/SAS over SATA, is not speed, but reliability. A SATA/PATA [...]

Intel Hyper-Threading (HT) Technology

Hyper-Threading Technology (HT) enables Intel Xeon multiprocessor servers to operate as if they had twice as many processors installed. HT Technology allows a single Central Processing Unit (CPU) to process two independent sets of instructions (or threads) at the same time. To find out if your processor support hyperthreading, run this Linux command: cat /proc/cpuinfo [...]

Configuring Linux for Multi-processors

Multi-processor computing invovles a computer with more than one CPU. To enable a multi-processor computer with Linux, the Linux kernel should be compiled with Symmetric MultiProcessing (SMP) enabled.

Serial Attached SCSI (SAS)

SAS is serial attached SCSI. SAS takes SATA2 (3.0Gbit/s wire speed) Point To Point protocol while the SCSI drives just allow for a shared bus. SAS allows for much higher speed data transfers than IDE or SCSI, but is still backwards-compatible with SATA drives. Reference Wikipedia

RAID 1 benefits

Disks configured under Raid 1 are mirrored. At least two disks are required to achieve the primary benefit of Raid 1 which is fault tolerance from disk errors and any single disk failure.

SCSI benefits

The main benefit of SCSI for a dedicated server is its ability to allow multiple accesses to data on the hard drive. Typically by multiple users for multiple applications. One possible solution for resolving dedicated server load (as evidenced by high IOWAIT CPU usage) is to configure additional SCSI drives and then balance disk I/O [...]

Clear DNS Cache – Windows

How to clear the DNS Cache on your local, Windows machine: Start Run CMD IPCONFIG /FLUSHDNS