Data Management - Hardware
Currently our image data is housed in two 2-Terabyte servers and two 4-Terabyte servers. Each pair constitutes a mirror of the other’s filesystem, and each filesystem is set up using RAID-5. Thus each machine consists of either eight (for the 2T systems) or 16 (for the 4T systems) 250 Gigabyte hard drives. The RAID-5 configuration means that a certain fraction of the capacity is devoted to a kind of redundancy which will allow the data on any single drive to be rebuilt from the others if that drive should fail.
We have nine computational machines each with 2G of RAM. Five have Pentium 4 3.6 GHz chips; three have Pentium 4 3.2 GHz and one (the fastest one actually) is an AMD 64 bit processor.
For analyzing images we have 6 SPARC machines running Solaris 9.