On Freitag, 10. September 2010 Richard Scobie wrote:
> Limited testing using dd and bonnie++ shows no difference in write
For dd it should always show the same, as you just sequentially write a
large file. Only with bonnie you would see differences due to stripe
sets, as the speed only drops when doing I/O not on boundaries and/or
smaller than the stripe size, as the stripe size is the smallest
possible I/O for the RAID.
I don't know why you don't see any difference with bonnie though.
FWIW, a stripe set of 256k means you do read/write 256k from a single
drive on each I/O, then the next 256k from the next drive. I hope you
have very few small accesses and mostly very large files. If you'd use a
database on that system it would crawl...
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc
it-management Internet Services
http://proteger.at [gesprochen: Prot-e-schee]
Tel: 0660 / 415 65 31
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