Pavel Machek wrote:
On Thu 2009-08-27 12:54:05, Jeff Garzik wrote:
[]
Only md/raid1 supports barriers at present, it seems. None of the other
MD drivers support barriers.
Not even md/raid0? Ouch :-(.
Only for raid1 there's no requiriment for inter-drive ordering. Hence
only raid1 supports barriers (and gained that support very recently,
in 1 or 2 kernel releases). For the rest, including raid0 and linear,
inter-drive ordering is necessary to implement barriers. Or md should
have its own queue (flushing) mechanisms.
/mjt
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