On Tue, 27 May 2014, Schweiss, Chip wrote:
Actually, with ZFS more free pages, does improve throughput, depending on how aggressive the SSDs garbage collector is. Since ZFS will write to every available block on the disk, after filling once, every write afterwards is overwriting a previously written logical block. If the SSD has enough spare blocks and an aggressive enough garbage collector, there
The above statement is contrary to what Richard Elling said about zfs behavior. Richard Elling said that zfs allocates from lower-addressed sectors first and so a non-full pool is unlikely to ever use upper-addressed sectors.
It is of course easy to test actual zfs behavior using a dtrace script.
Bob -- Bob Friesenhahn [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
