raid over sata - write barrier

I've found that ext3 + sata + kernel 2.6.12 supports the write barrier mount
option (-o barrier=1)
(found it here: http://marc.10east.com/?l=linux-scsi&m=112019898711806)

is write barrier supported with RAID (md) over sata, with ext3? (which
kernel version?)
(or we have to disable write cache in HD in this case?)

thanks

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