On Sunday 25 April 2010 23:03:53 Dan Naumov wrote: In regards to vfs.zfs.vdev.max_pending - I seem to recall it is set to 35 to avoid using up all bandwidth in the IO subsystem - would it not make more sense to match the NCQ/TCQ values as default? E.g. 32 or lower for AHCI - don't know what it would be for TCQ?