6. Features in the EATA DMA driver

This section describes some of the commands available under Linux to check on the RAID configuration. Again, while references to the eata_dma driver is made, this can be used to check up on any driver.

To see the configuration for your driver, type:

% cat /proc/scsi/eata_dma/N

where N is the host id for the controller. You should see something like this:

EATA (Extended Attachment) driver version: 2.59b
queued commands:         353969
processed interrupts:    353969

scsi0 : HBA PM2144UW
Firmware revision: v07L.Y
Hardware Configuration:
IRQ: 11, level triggered
DMA: BUSMASTER
CPU: MC68020 20MHz
Base IO : 0xef90
Host Bus: PCI
SCSI Bus: WIDE Speed: 10MB/sec.
SCSI channel expansion Module: not present
SmartRAID hardware: present.
    Type: integrated
    Max array groups:              7
    Max drives per RAID 0 array:   7
    Max drives per RAID 3/5 array: 7
Cache Module: present.

    Type: 0
    Bank0: 16MB without ECC
    Bank1: 0MB without ECC
    Bank2: 0MB without ECC
    Bank3: 0MB without ECC
Timer Mod.: present
NVRAM     : present
SmartROM  : enabled
Alarm     : on
Host<->Disk command statistics:
         Reads:      Writes:
    1k:           0            0
    2k:           0            0
    4k:           0            0
    8k:           0            0
   16k:           0            0
   32k:           0            0
   64k:           0            0
  128k:           0            0
  256k:           0            0
  512k:           0            0
 1024k:           0            0
>1024k:           0            0
Sum   :           0            0

To get advanced command statistics, type:

% echo "eata_dma latency" > /proc/scsi/eata_dma/N

Then you can do a:

% cat /proc/scsi/eata_dma/N

to get more detailed statistics.

To turn off advanced command statistics, type:

% echo "eata_dma nolatency" > /proc/scsi/eata_dma/N

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Generated: 2007-01-26 17:58:28