hi  all
have problem
netbsd current+ netatalk1.5.3.1
work 
but last time i have in /var/log/messages :

Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command timeout
Jul 24 20:50:52 prepress /netbsd: siop1: scsi bus reset
Jul 24 20:50:52 prepress /netbsd: sd3: async, 8-bit transfers, tagged
queueing
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 1
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 2
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 3
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 4
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 5
reset

Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 6
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 7
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 8
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 9
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 10
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 11
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 12
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 13
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 14
reset
Jul 24 20:50:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 15
reset
Jul 24 20:50:52 prepress /netbsd: sd4: async, 8-bit transfers, tagged
queueing
Jul 24 20:50:52 prepress /netbsd: sd5(siop1:0:5:0): command with tag id 1
reset
Jul 24 20:50:52 prepress /netbsd: sd5: async, 8-bit transfers, tagged
queueing
Jul 24 20:50:52 prepress /netbsd: sd6: async, 8-bit transfers, tagged
queueing
Jul 24 20:50:52 prepress /netbsd: sd4: sync (100.0ns offset 8), 16-bit
(20.000MB
/s) transfers, tagged queueing
Jul 24 20:50:52 prepress /netbsd: sd5: sync (100.0ns offset 8), 16-bit
(20.000MB
/s) transfers, tagged queueing
Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command timeout
Jul 24 20:51:52 prepress /netbsd: siop1: scsi bus reset
Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 1
reset
Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 2
reset

Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 3
reset
Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 4
reset
Jul 24 20:51:52 prepress /netbsd: sd4(siop1:0:4:0): command with tag id 5
reset

etc.
during this message shared volumes cant be accessible appletalk,system
freeze.
whats up?!