[Discuss] Adventures in N40L Land

[Chuck Anderson]

On Fri, Feb 24, 2012 at 08:16:27PM -0500, Richard Pieri wrote:
> On Feb 24, 2012, at 7:41 PM, Richard Pieri wrote:
> > 
> > ashift=12 (4K alignment) and recreated my RAID-Z pool.  The result: sustained write performance has gone from 10MB/s to 30MB/s.  Not a bad gain for a simple fix (and a few hours of digging for it :).
> 
> I must correct myself.  That 30MB/s figure appears to be the I/O limit on the USB disk dock that I'm using to restore my ZFS snapshots.  A restore (zfs receive) along with the command "dd if=/dev/zero of=zero bs=4k" to the same pool is showing sustained 60MB/s write performance (20MB/s per spindle).
> 
> I need to figure out how to get the eSATA port on the disk dock working. :)

Search for N40L bios mods.  There are ones that enable full AHCI use
of the 5th internal SATA (optical disc drive) port and the eSATA port.
I haven't tried it yet myself.