Miguel Medalha wrote:
have raid 0 and raid1 on the same drive isn't going to gie you anything
since the raid 1 will "slow" the other raids down.
You are assuming that both arrays will always be concurrently accessed
but that may not be the case.
More yet: the configuration may have been studied in such a way that
concurrent access is rarely the case.
If you only have 2 drives there's not much you can do to avoid
concurrent access. The killer is head seek time - if you have your only
2 drives tied together in any kind of raid and the head needs to be in 2
places at once it doesn't matter much how you laid out the partitions.
Reads can be sort-of independent on raid1 but writes make both seek to
the same place.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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