On Tue, 1 Jul 2008, Johan Hartzenberg wrote: > > Larger disks can put more data on the outer edge, where performance is > better.
On the flip side, disks with a smaller form factor produce less vibration and are less sensitive to it so seeks stabilize faster with less chance of error. The platters are also smaller so they can seek faster and more reliably. Less heat is produced and less energy is consumed. The 2.5" form factor is the better choice if large storage is not required. > get pretty decent performance. I read somewhere that ZFS automatically > gives preferences to the outer cylinders of a disk when selecting free > blocks, but you could also restrict the ZFS pool to using only the outer say > 20 GB of each disk by creating slices and adding those to the pool. A more effective method would be to place a quota on the filesystem which assures that there will always be substantial free space in the pool. Simply decide to not use a large part of the pool space. With lots of free space in the pool, zfs won't have to look very hard for more free space to satisfy its COW requirements and it is more likely that the allocation is a good one (less fragmentation). Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
