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NGAS
HW (1):
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Started
with 8 slots parallel ATA systems.
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8
x 80 GB storage capacity per node (640 GB/node, ~1.2 TB compressed).
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Since
March 2004 a 24 slot serial ATA system in operation (up to 24 * 400 GB
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=
9.6 TB/node, 19.2 TB compressed).
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Reduces
price per GB.
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More
robust HW amongst other due to serial ATA (cleaner cabling).
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Disk
handling easier, more robust disk frames.
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Overall
HW stability (hopefully) better and less intervention needed (TBC).
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Amount
of data/CPU should be balanced to be able to process the data in a
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limited
time.
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TBD
when to use new HW in operation at observatory sites.
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Investigating
usage of RAID5 rather then JBOD disks.
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