Seagate Cheetahs only async on controller

[Christian Baer <christian.baer%uni-dortmund.de@localhost>]

Hey there people!

My Sun is driving me nuts with a performance problem. Although the two 
installed drives are at least average in speed, currently they 'feel' 
more like MFM-drives. :-/

scsibus1: waiting 2 seconds for devices to settle...
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <SEAGATE, SX173404LC, BD0A> disk fixed
sd0: 70007 MB, 14100 cyl, 24 head, 423 sec, 512 bytes/sect x 143374738
     sectors
sd0: async, 8-bit transfers, tagged queueing
sd1 at scsibus0 target 1 lun 0: <SEAGATE, SX173404LC, BD0A> disk fixed
sd1: 70007 MB, 14100 cyl, 24 head, 423 sec, 512 bytes/sect x 143374738
     sectors
sd1: async, 8-bit transfers, tagged queueing
cd0 at scsibus0 target 6 lun 0: <TOSHIBA, DVD-ROM SD-M1401, 1007> cdrom
    removable
cd0: sync (50.00ns offset 16), 8-bit (20.000MB/s) transfers

As you can see, both drives are only connected async - while the CD-ROM 
is conntected sync with 20MB/s. I have configured a custom kernel, but I 
get this problem with the GENERIC one to.

What can I do about this?

Am am running this:
NetBSD sunny 4.99.66 NetBSD 4.99.66 (SUNNY) #0: Wed Jun 25 12:40:00 CEST 
2008 
christian@sunny:/usr/build/obj.sparc64/usr/src/sys/arch/sparc64/compile/SUNNY 
sparc64

Regards,
Chris