Questions about hdparm
Don Smith
smith189 at gta.igs.net
Thu Sep 23 17:09:18 UTC 2004
Douglas Phillipson wrote:
> hdparm doesn't seem to report, for SCSI drives, the asme stuff it does
> for IDE drives. I'm specifically looking to see if DMA transfers are
> on or off. I presume since I don't see a "using_dma" attribute that
> it doesn't apply to SCSI???
>
> IDE:
>
> /sbin/hdparm -vt /dev/hda
>
> /dev/hda:
> multcount = 16 (on)
> IO_support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 256 (on)
> geometry = 65535/16/63, sectors = 156301488, start = 0
> Timing buffered disk reads: 96 MB in 3.00 seconds = 31.97 MB/sec
>
>
> SCSI:
>
> /sbin/hdparm -vt /dev/sda
>
> /dev/sda:
> readonly = 0 (off)
> geometry = 4420/255/63, sectors = 71020544, start = 0
> Timing buffered disk reads: 64 MB in 1.43 seconds = 44.76 MB/sec
>
>
> Regards
>
> Doug p
>
>
From the man pages:
DESCRIPTION
hdparm provides a command line interface to various hard disk
ioctls
supported by the stock Linux ATA/IDE device driver
subsystem. Some
options may work correctly only with the latest kernels.
For best
results, compile hdparm with the include files from the latest
kernel
source code.
It is only for ATA/IDE drives.
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