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Initial testing has shown the the right IO scheduler to use under Linux is noop. This strikes the ideal balance by allowing the zfs elevator to do all request ordering and prioritization. While allowing the Linux elevator to do the maximum front/back merging allowed by the physical device. This yields the largest possible requests for the device with the lowest total overhead. While 'noop' should be right for your system you can choose a different IO scheduler with the 'zfs_vdev_scheduler' option. You may set this value to any of the standard Linux schedulers: noop, cfq, deadline, anticipatory. In addition, if you choose 'none' zfs will not attempt to change the IO scheduler for the block device.
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org