> More system RAM does not help synchronous writes go much faster.
agreed, but it does make sure all the asynchronous writes are
batched and the tgx group isn't committed early keeping everything
synchronous. (default batch is every 5 sec)
> If you want good write performance, instead of adding N GB of cache memory
> to a disk controller, add N*5 or N*10 GB of system memory (DDR2 is maybe
it kinda comes down to number of spindles in the end, even
if you have a huge log device, or huge system ZIL, it needs
to get to the disks (synchronous) in the end.
the rules don't change with zfs, the system with the most
vdevs wins :-)
Rob
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