Добрый день!

Имеем следующее:
2x Xeon 2.8GHz, 1GB RAM, Adaptec AIC7901A Ultra320 SCSI adapter, 2x36BM Seagate Cheetah;
Red Hat Linux Advanced Server release 2.1AS
kernel linux 2.4.9

И диски и контроллер поддерживают Ultra SCSI 320. По почему-то контроллер находит диски на 3.300MB/s! Хотя раньше диски работали на 320MB/s.
Сервер некоторое время не использовали и перенесли в другое место, а затем вернули обратно. В логах ничего не нашел.

часть лога при загрузке:
...
SCSI subsystem driver Revision: 1.00
scsi0 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 1.3.4
<Adaptec AIC7901A Ultra320 SCSI adapter>
aic7901A: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs

(scsi0:A:0): 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT|IU|QAS, 16bit)
(scsi0:A:0): 160.000MB/s transfers (80.000MHz DT, 16bit)
(scsi0:A:0): 80.000MB/s transfers (40.000MHz DT, 16bit)
(scsi0:A:0): 80.000MB/s transfers (40.000MHz, 16bit)
(scsi0:A:0): 66.006MB/s transfers (33.003MHz DT, 16bit)
(scsi0:A:0): 66.006MB/s transfers (33.003MHz, 16bit)
...
(scsi0:A:0): 5.102MB/s transfers (5.102MHz)
(scsi0:A:0): 5.000MB/s transfers (5.000MHz)
(scsi0:A:1): 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
(scsi0:A:1): 160.000MB/s transfers (80.000MHz DT|IU|QAS, 16bit)
(scsi0:A:1): 160.000MB/s transfers (80.000MHz DT, 16bit)
(scsi0:A:1): 80.000MB/s transfers (40.000MHz DT, 16bit)
...
(scsi0:A:1): 5.102MB/s transfers (5.102MHz)
(scsi0:A:1): 5.000MB/s transfers (5.000MHz)
Vendor: SEAGATE Model: ST336607LW Rev: 0005
Type: Direct-Access ANSI SCSI revision: 03
Vendor: SEAGATE Model: ST336607LW Rev: 0005
Type: Direct-Access ANSI SCSI revision: 03
(scsi0:A:0): 3.300MB/s transfers
scsi0:A:0:0: Tagged Queuing enabled. Depth 32
(scsi0:A:1): 3.300MB/s transfers
scsi0:A:1:0: Tagged Queuing enabled. Depth 32
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
SCSI device sda: 71687372 512-byte hdwr sectors (36704 MB)
Partition check:
sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 >
SCSI device sdb: 71687372 512-byte hdwr sectors (36704 MB)
sdb: sdb1 sdb2 sdb3
...

# uname -r
2.4.9-e.25smp

# lspci -v
00:00.0 Host bridge: Intel Corporation: Unknown device 254c (rev 01)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, fast devsel, latency 0
        Capabilities: [40] #09 [1105]

00:00.1 Class ff00: Intel Corporation: Unknown device 2541 (rev 01)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: fast devsel

00:03.0 PCI bridge: Intel Corporation: Unknown device 2545 (rev 01) (prog-if 00 [Normal decode])
        Flags: bus master, 66Mhz, fast devsel, latency 64
        Bus: primary=00, secondary=02, subordinate=04, sec-latency=0
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: fe900000-febfffff

00:03.1 Class ff00: Intel Corporation: Unknown device 2546 (rev 01)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: fast devsel

00:1d.0 USB Controller: Intel Corporation: Unknown device 2482 (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, medium devsel, latency 0, IRQ 16
        I/O ports at 3040 [size=32]

00:1d.1 USB Controller: Intel Corporation: Unknown device 2484 (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, medium devsel, latency 0, IRQ 19
        I/O ports at 3020 [size=32]

00:1d.2 USB Controller: Intel Corporation: Unknown device 2487 (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, medium devsel, latency 0, IRQ 18
        I/O ports at 3000 [size=32]

00:1e.0 PCI bridge: Intel Corporation 82820 820 (Camino 2) Chipset PCI (rev 42) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
        I/O behind bridge: 00001000-00001fff
        Memory behind bridge: fc700000-fe8fffff

00:1f.0 ISA bridge: Intel Corporation: Unknown device 2480 (rev 02)
        Flags: bus master, medium devsel, latency 0

00:1f.1 IDE interface: Intel Corporation: Unknown device 248b (rev 02) (prog-if 8a [Master SecP PriP])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, medium devsel, latency 0, IRQ 17
        I/O ports at <unassigned> [size=8]
        I/O ports at <unassigned> [size=4]
        I/O ports at <unassigned> [size=8]
        I/O ports at <unassigned> [size=4]
        I/O ports at 03a0 [size=16]
        Memory at 40000000 (32-bit, non-prefetchable) [disabled] [size=1K]

00:1f.3 SMBus: Intel Corporation: Unknown device 2483 (rev 02)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: medium devsel, IRQ 17
        I/O ports at 0580 [size=32]

01:03.0 Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] (rev 0d)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, medium devsel, latency 64, IRQ 20
        Memory at fe7e0000 (32-bit, non-prefetchable) [size=4K]
        I/O ports at 1400 [size=64]
        Memory at fe7a0000 (32-bit, non-prefetchable) [size=128K]
        Expansion ROM at fe790000 [disabled] [size=64K]
        Capabilities: [dc] Power Management version 2

01:04.0 Ethernet controller: Intel Corporation: Unknown device 100e (rev 02)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 21
        Memory at fe760000 (32-bit, non-prefetchable) [size=128K]
        I/O ports at 1440 [size=64]
        Capabilities: [dc] Power Management version 2
        Capabilities: [e4] PCI-X non-bridge device.
        Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-

01:0c.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27) (prog-if 00 [VGA])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, stepping, medium devsel, latency 64, IRQ 23
        Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
        I/O ports at 1000 [size=256]
        Memory at fe7f0000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at fe7c0000 [disabled] [size=128K]
        Capabilities: [5c] Power Management version 2

02:1c.0 PIC: Intel Corporation: Unknown device 1461 (rev 04) (prog-if 20 [IO(X)-APIC])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, 66Mhz, fast devsel, latency 0
        Memory at febe0000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [50] PCI-X non-bridge device.

02:1d.0 PCI bridge: Intel Corporation: Unknown device 1460 (rev 04) (prog-if 00 [Normal decode])
        Flags: bus master, 66Mhz, fast devsel, latency 64
        Bus: primary=02, secondary=04, subordinate=04, sec-latency=64
        Capabilities: [50] PCI-X non-bridge device.

02:1e.0 PIC: Intel Corporation: Unknown device 1461 (rev 04) (prog-if 20 [IO(X)-APIC])
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, 66Mhz, fast devsel, latency 0
        Memory at febf0000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [50] PCI-X non-bridge device.

02:1f.0 PCI bridge: Intel Corporation: Unknown device 1460 (rev 04) (prog-if 00 [Normal decode])
        Flags: bus master, 66Mhz, fast devsel, latency 64
        Bus: primary=02, secondary=03, subordinate=03, sec-latency=64
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: fe900000-feafffff
        Capabilities: [50] PCI-X non-bridge device.

03:03.0 SCSI storage controller: Adaptec: Unknown device 801e (rev 03)
        Subsystem: Intel Corporation: Unknown device 3418
        Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 26
        I/O ports at 2000 [size=256]
        Memory at feaf0000 (64-bit, non-prefetchable) [disabled] [size=8K]
        I/O ports at 2400 [size=256]
        Expansion ROM at fea00000 [disabled] [size=512K]
        Capabilities: [dc] Power Management version 2
        Capabilities: [a0] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable-
        Capabilities: [94] PCI-X non-bridge device.

Есть ли какие-нибудь соображения на этот счет?
В чем причина столь низкой скорости?
Спасибо!