Re: [Comm] Re: скорость raid 5

[Alexey Berezkin]

Hello Konstantin,

Monday, September 29, 2003, 8:00:10 PM, you wrote:

KL> Hi Alexey!

KL> Monday 29, at 11:53:43 AM you wrote:

>> Hello community,
>> 
>> Есть железяка, gateway 8200 с контролером aic7890 и ami megaraid. 4
>> диска segate cheetah в raid 5. Как я понимаю непрерывный трансфер
>> должен быть порядка 40-50Мb/s. Хотя hdparm дает следующее:
>> #hdparm -tT /dev/sda
>> 
>> /dev/sda:
>>  Timing buffer-cache reads:   492 MB in  2.00 seconds = 246.00 MB/sec
>>  Timing buffered disk reads:   26 MB in  3.16 seconds =   8.23 MB/sec
>> 
>>  Помогите разобраться с этой проблемой, или наставте на путь истинный.
>> P.S. Кусок dmesg в атаче.
KL> irq conflict? Плохая терминация? Какой размер кеша на megaraid?

KL> например, с MegaRAID Elite 1600 след. картина:

KL> root на cedar ~# hdparm -tT /dev/sda

KL> /dev/sda:
KL>  Timing buffer-cache reads:   864 MB in  2.00 seconds = 432.00 MB/sec
KL>  Timing buffered disk reads:  186 MB in  3.01 seconds =  61.79 MB/sec
KL> root на cedar ~#

KL> root на cedar ~# cat /proc/megaraid/0/config 
KL> MegaRAID Elite 1600
KL> Controller Type: 438/466/467/471/493
KL> Controller Supports 40 Logical Drives
KL> Controller / Driver uses 64 bit memory addressing
KL> Base = f8825000, Irq = 21, Logical Drives = 1, Channels = 2
KL> Version =G170:F316, DRAM = 128Mb
KL> Controller Queue Depth = 254, Driver Queue Depth = 126

KL> правда у меня raid10

Спасибо, что ответили на мое письмо. Конфиг привожу:
# cat /proc/megaraid/0/config
Controller Type: 418/428/434
Base = 00002810, Irq = 9, Logical Drives = 1, Channels = 3
Version =Xl75:1.42, DRAM = 4Mb
Controller Queue Depth = 254, Driver Queue Depth = 126

По поводу irq есть ругань acpi:

ACPI: have wakeup address 0xc0001000
On node 0 totalpages: 32768
zone(0): 4096 pages.
zone(1): 28672 pages.
zone(2): 0 pages.
ACPI: Unable to locate RSDP


ACPI: Subsystem revision 20021122
PCI: PCI BIOS revision 2.10 entry at 0xfd95e, last bus=2
PCI: Using configuration type 1
ACPI: System description tables not found
    ACPI-0066: *** Error: Acpi_load_tables: Could not get RSDP, AE_NOT_FOUND
    ACPI-0116: *** Error: Acpi_load_tables: Could not load tables: AE_NOT_FOUND
ACPI: Unable to load the System Description Tables
PCI: Probing PCI hardware
PCI: ACPI tables contain no PCI IRQ routing entries
PCI: Probing PCI hardware (bus 00)
PCI: Using IRQ router PIIX [8086/7110] at 00:02.0
PCI: Cannot allocate resource region 4 of device 00:02.1
Limiting direct PCI/PCI transfers.

Как я понимаю проблемма скорее всего в этом.


-- 
Best regards,
 Alexey