Adaptech 39160 but only 20mhz?

[Golliher, Blake]

Hi all!

This seems strange to me, but maybe one of ya'll have seen it.  These drives are from an old netapp box, hence the odd drive vendor.

from /var/log/dmesg

scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8
        <Adaptec 3960D Ultra160 SCSI adapter>
        aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs

scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8
        <Adaptec 3960D Ultra160 SCSI adapter>
        aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs

blk: queue c3609a14, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: NETAPP    Model: X245_HJURD036S10  Rev: NA01
  Type:   Direct-Access                      ANSI SCSI revision: 03
blk: queue c3609c14, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: NETAPP    Model: X245_HJURD036S10  Rev: NA01
  Type:   Direct-Access                      ANSI SCSI revision: 03
blk: queue c1f22014, I/O limit 4095Mb (mask 0xffffffff)
scsi0:A:0:0: Tagged Queuing enabled.  Depth 253
scsi0:A:1:0: Tagged Queuing enabled.  Depth 253
blk: queue c1f22014, I/O limit 4095Mb (mask 0xffffffff)
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
(scsi0:A:0): 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
SCSI device sda: 72205440 512-byte hdwr sectors (36969 MB)
Partition check:
 sda: sda1 sda2 sda3 sda4 < sda5 >
(scsi0:A:1): 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
SCSI device sdb: 72205440 512-byte hdwr sectors (36969 MB)
 sdb: sdb1 sdb2

from cat /proc/scsi/aic7xxx/0 
Adaptec AIC7xxx driver version: 6.2.8
aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs

Serial EEPROM:
0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 
0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 0xc33a 
0xb8f4 0x7d5d 0x2807 0x0010 0xffff 0xffff 0xffff 0xffff 
0xffff 0xffff 0xffff 0xffff 0xffff 0xffff 0x0250 0x944e 

Channel A Target 0 Negotiation Settings
        User: 160.000MB/s transfers (80.000MHz DT, offset 255, 16bit)
        Goal: 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
        Curr: 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
        Channel A Target 0 Lun 0 Settings
                Commands Queued 3252687
                Commands Active 0
                Command Openings 110
                Max Tagged Openings 110
                Device Queue Frozen Count 0
Channel A Target 1 Negotiation Settings
        User: 160.000MB/s transfers (80.000MHz DT, offset 255, 16bit)
        Goal: 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
        Curr: 40.000MB/s transfers (20.000MHz, offset 101, 16bit)
        Channel A Target 1 Lun 0 Settings
                Commands Queued 16397
                Commands Active 0
                Command Openings 110
                Max Tagged Openings 110
                Device Queue Frozen Count 0

And, as expected, my performance isn't the greatest.

[root at cuda scsi]# hdparm -tT /dev/sdb1 

/dev/sdb1:
 Timing buffer-cache reads:   128 MB in  1.22 seconds =104.69 MB/sec
 Timing buffered disk reads:  64 MB in  2.49 seconds = 25.70 MB/sec
[root at cuda scsi]# 

So my question is, what kind of performance should I be expecting?  And is there anything I can do to fix this performance problem?  These are Hitachi JuraD disks at 10k rpm.


Blake