[Hardware] hdparm and drives

["Andriy Dobrovol's'kii" <dobr@iop.kiev.ua>]

Hi
Есть система с несколькими устройствами на IDE.
hdparm -I /dev/hdd

/dev/hdd:

ATAPI CD-ROM, with removable media
         Model Number:       HL-DT-STDVD-ROM GDR8162B
         Serial Number:
         Firmware Revision:  0015
Standards:
         Likely used CD-ROM ATAPI-1
Configuration:
         DRQ response: 50us.
         Packet size: 12 bytes
Capabilities:
         LBA, IORDY(can be disabled)
         DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2
              Cycle time: min=120ns recommended=120ns
         PIO: pio0 pio1 pio2 pio3 pio4
              Cycle time: no flow control=120ns  IORDY flow 
control=120ns

hdparm -I /dev/hdc

/dev/hdc:

ATAPI CD-ROM, with removable media
         Model Number:       _NEC CD-RW NR-7800B
         Serial Number:
         Firmware Revision:  1.01
Standards:
         Likely used CD-ROM ATAPI-1
Configuration:
         DRQ response: 3ms.
         Packet size: 12 bytes
Capabilities:
         LBA, IORDY(cannot be disabled)
         DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
              Cycle time: min=120ns recommended=120ns
         PIO: pio0 pio1 pio2 pio3 pio4
              Cycle time: no flow control=120ns  IORDY flow 
control=120ns

hdparm -I /dev/hda

/dev/hda:

ATA device, with non-removable media
         Model Number:       SAMSUNG SV4002H
         Serial Number:      0379J1FT137559
         Firmware Revision:  QP100-07
Standards:
         Used: ATA/ATAPI-6 T13 1410D revision 1
         Supported: 6 5 4 3
Configuration:
         Logical         max     current
         cylinders       16383   16383
         heads           16      16
         sectors/track   63      63
         --
         CHS current addressable sectors:   16514064
         LBA    user addressable sectors:   78242976
         device size with M = 1024*1024:       38204 MBytes
         device size with M = 1000*1000:       40060 MBytes (40 GB)
Capabilities:
         LBA, IORDY(cannot be disabled)
         bytes avail on r/w long: 4      Queue depth: 1
         Standby timer values: spec'd by Standard, no device 
specific minimum
         R/W multiple sector transfer: Max = 16  Current = 16
         Recommended acoustic management value: 128, current value: 0
         DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
              Cycle time: min=120ns recommended=120ns
         PIO: pio0 pio1 pio2 pio3 pio4
              Cycle time: no flow control=120ns  IORDY flow 
control=120ns
Commands/features:
         Enabled Supported:
            *    NOP cmd
            *    READ BUFFER cmd
            *    WRITE BUFFER cmd
            *    Host Protected Area feature set
            *    Look-ahead
            *    Write cache
            *    Power Management feature set
                 Security Mode feature set
                 SMART feature set
            *    Mandatory FLUSH CACHE command
                 Automatic Acoustic Management feature set
                 SET MAX security extension
            *    DOWNLOAD MICROCODE cmd
Security:
         Master password revision code = 65534
                 supported
         not     enabled
         not     locked
         not     frozen
         not     expired: security count
                 supported: enhanced erase
         20min for SECURITY ERASE UNIT. 20min for ENHANCED SECURITY 
ERASE UNIT.
HW reset results:
         CBLID- above Vih
         Device num = 0 determined by the jumper
Checksum: correct

Всё работает, но как-то медленно.
Есть желание "получить больше за те же деньги". :)
Файл /etc/sysconfig/harddisks сплошные комментарии. Я правильно 
понимаю, что в моем случае снять комментарий с включения дма вполне 
безопасно? И в строку дополнительных ключей можно внести установку 
режима pio4?
Или не стоит? И нужно создавать по отдельному файлу на каждое 
устройство в /etc/sysconfig/harddisk?
-- 
Rgrds,
Andriy
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email: dobr at iop dot kiev dot ua            Kyiv, Ukraine
Phone: (380-44)   265-7824            Department of Gas Electronics
Fax:   (380-44)   265-2329             Institute of Physics of NASU
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