Now, given proper I/O concurrency (like recently improved NCQ in our
drivers) or SCSI CTQ,
I don't not expect the write caches to provide much performance
gains, if any, over the situation
with write caches off.
Write caches can be extremelly effective when dealing with drives
that do not handle concurrent requests properly.
I'd be interested to see data that shows otherwise.
-r
Le 4 avr. 07 à 15:20, Constantin Gonzalez a écrit :
Hi,
Manoj Joseph wrote:
Can write-cache not be turned on manually as the user is sure that
it is
only ZFS that is using the entire disk?
yes it can be turned on. But I don't know if ZFS would then know
about it.
I'd still feel more comfortably with it being turned off unless ZFS
itself
does it.
But maybe someone from the ZFS team can clarify this.
Cheers,
Constantin
--
Constantin Gonzalez Sun Microsystems
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Platform Technology Group, Global Systems Engineering http://
www.sun.de/
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