On Jul 24, 2009, at 2:33 PM, Bob Friesenhahn wrote:
On Fri, 24 Jul 2009, Kyle McDonald wrote:
http://www.anandtech.com/storage/showdoc.aspx?i=3531&p=8
This an interesting test report. Something quite interesting for
zfs is if the write rate is continually high, then the write
performance will be limited by the FLASH erase performance,
regardless of the use of something like TRIM. TRIM only improves
write latency in the case that the FLASH erase is able to keep ahead
of the write rate. If the writes are bottlenecked, then using TRIM
is likely to decrease the write performance. If data is written at
an almost constant rate, then a time may come where the drive
suddenly "hits the wall" and is no longer able to erase the data as
fast as it comes in.
Yep. Good thing we can "zfs add" a log to spread the load.
NB "zfs add" log != "zfs attach" log
-- richard
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