> Why all people are strongly recommending to use whole disk (not part > of disk) for creation zpools / ZFS file system ?
One thing is performance; ZFS can enable/disable write cache in the disk at will if it has full control over the entire disk.. ZFS will also flush the WC when necessary, and if applications are waiting for an I/O to complete, this is typically a point where data must be flushed out. So I don't expect much application performance gains here. There is a subset of SATA drives that do not handle concurrent I/O requests and staging I/Os through the cache can be a away to drive more data throughput in them. But for many devices the write cache is not a big performance factor. ZFS does some intelligent I/O scheduling and giving it entire disks allows that code to be more effective. Building pools with many slices from one disk, means more head movements and lost performance. -r _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
