On Tue, Jul 12 at 23:44, Jim Klimov wrote:
2011-07-12 23:14, Eric Sproul пишет:
So finding drives that keep more space in reserve is key to getting
consistent performance under ZFS.
I think I've read in a number of early SSD reviews
(possibly regarding Intel devices - not certain now)
that the vendor provided some low-level formatting
tools which essentially allowed the user to tune how
much flash would be useable and how much would
be set aside as the reserve...
Perhaps this rumour is worth an exploration too -
do any modern SSDs have similar tools to switch
them between capacity and performance modes,
or such?
It doesn't require special tools, just partition the device.
Since ZFS will stay within a partition boundary if told to, that
should allow you to guarantee a certain minimum reserve area available
for other purposes.
e.g. Take a 100GB drive and partition it to 80GB. Assuming the
original drive was a 100GB/100GiB design, you now have (100*0.07)+20
GB of spare area, which depending on the design, may significantly
lower write amplification and thus increase performance on a device
that is "full."
--eric
--
Eric D. Mudama
edmud...@bounceswoosh.org
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