Hi,

dd is using the writeback cache, you have wcd=false this means: allow an 
application to control the write mode. In this case dd will write without a 
sync flag and thus it can go to DRAM instead of the ZIL. This is actually a 
good thing if you have applications that understand the write semantics which 
are required to protect its own data integrity.

You can simply set wcd=true and it will force the sync mode to always occur.

Regards,

Mike

http://blog.laspina.ca/
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