Wojciech Puchar wrote:
I am seeing 85MB/s as a speed of a single Hitachi 1TB HD.
How high can you go by mirroring or striping 2, 3, 4 harddrives?
mirroring - the same, just with 2 processes reading both can get the
bandwidth. make sure you use -s high enough (like 1048576) doing
gmirror label
stripping - the same, or 2,3,4 times, depends how you configure.
for highest transfer and lowest concurrency (you mostly read huge
files with one process) - use small stripe size.
for lowest transfer (=1 disk) and highest concurency - use very huge
stripe size like 512MB, so simply different process reading different
things can hit different drives, but each I/O isn't spread.
So if I will put 6 hard drives with stripping each of them is 85MB/s (in
the beginning sectors) I will get 6X85MB/s=4.08Gb/s?
Is it reasonable to expect this kind of speed? Something tells me that
there will be some other factors like bus speed that would potentially
limit the speed in such case.
Yuri
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