Just thought I would add that on single user systems dedicating memory slightly
greater than scan size to file cache will give as near instant write response
as your software and processor is capable of achieving (even non-raid). In
fact during write opertions raid 0 on a memory handicapped machine will be
slower than a single drive machine with loads of memory. Read operations will
be quicker with raid 0 unless the data you're loading is still in file cache.
Adding memory is much cheaper than raid drive systems as 256MB of top quality
SDRAM/DDR ram available for less than £30.
If you have a smart raid 1 solution (stripes when reading) and lots of
available memory for disk cache then performance for a single user doing
scanning/PS will be indistinguishable from raid 0. But you do lose disk space
in exchange for reliability.
Steve
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