6859997 zfs caching performance problem
6868951 Add kstats for ZFS data prefetch (zfetch)
6847118 hang in ZFS during rollback

6447377 ZFS prefetch is inconsistant

PSARC 2002/240 ZFS
6338653 Integrate ZFS
PSARC 2004/652 - DKIOCFLUSH
5096886 Write caching disks need mechanism to flush cache to physical media