UDMA(100) vs. UDMA(33)

UDMA(100) vs. UDMA(33)

Post by Akop Pogosia » Sun, 19 Aug 2001 14:25:41



Just bought a 40GB IBM Deskstar 60GXP. On boot, the system reports:

hda: 40132503 sectors (20548 MB) w/1902KiB Cache, CHS=2498/255/63,UDMA(100)
hdc: 80418240 sectors (41174 MB) w/1916KiB Cache, CHS=79780/16/63,UDMA(33)

hda is my old disk, hdc is the new disk. Does this mean that the new
disk is not operating in ATA-5 (which allows 100MB/sec transfer) mode?

Running hdparm -t -T confirms that the second disk is slightly slower
although the general concesus is that 60GXP is the fastest IDE hard
drive out there ..


/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.91 seconds =140.66 MB/sec
 Timing buffered disk reads:  64 MB in  1.87 seconds = 34.22 MB/sec

/dev/hdc:
 Timing buffer-cache reads:   128 MB in  0.91 seconds =140.66 MB/sec
 Timing buffered disk reads:  64 MB in  3.13 seconds = 20.45 MB/sec

Note that the second disk is spinning unmounted and unused at the moment
of running hdparm.

The settings for both hard drives are identical:

/dev/hda:
 multcount    = 16 (on)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 2498/255/63, sectors = 40132503, start = 0

/dev/hdc:
 multcount    = 16 (on)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5005/255/63, sectors = 80418240, start = 0

This doesn't really much to me, I am just curios why those two kernel
are not consistent with each other..

--
Akop Pogosian

BugID 4137237: patchadd 106300-01 results in rm -rf / as root

 
 
 

UDMA(100) vs. UDMA(33)

Post by Dave Uhrin » Sun, 19 Aug 2001 15:44:19



> Just bought a 40GB IBM Deskstar 60GXP. On boot, the system reports:

> hda: 40132503 sectors (20548 MB) w/1902KiB Cache,
> CHS=2498/255/63,UDMA(100) hdc: 80418240 sectors (41174 MB) w/1916KiB
> Cache, CHS=79780/16/63,UDMA(33)

> hda is my old disk, hdc is the new disk. Does this mean that the new
> disk is not operating in ATA-5 (which allows 100MB/sec transfer) mode?

> Running hdparm -t -T confirms that the second disk is slightly slower
> although the general concesus is that 60GXP is the fastest IDE hard
> drive out there ..


> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  0.91 seconds =140.66 MB/sec
>  Timing buffered disk reads:  64 MB in  1.87 seconds = 34.22 MB/sec

> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  0.91 seconds =140.66 MB/sec
>  Timing buffered disk reads:  64 MB in  3.13 seconds = 20.45 MB/sec

> Note that the second disk is spinning unmounted and unused at the
> moment of running hdparm.

> The settings for both hard drives are identical:

> /dev/hda:
>  multcount    = 16 (on)
>  I/O support  =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  nowerr       =  0 (off)
>  readonly     =  0 (off)
>  readahead    =  8 (on)
>  geometry     = 2498/255/63, sectors = 40132503, start = 0

> /dev/hdc:
>  multcount    = 16 (on)
>  I/O support  =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  nowerr       =  0 (off)
>  readonly     =  0 (off)
>  readahead    =  8 (on)
>  geometry     = 5005/255/63, sectors = 80418240, start = 0

> This doesn't really much to me, I am just curios why those two kernel
> are not consistent with each other..

Do you have a CDROM connected as /dev/hdd?

Configure the new drive as a Slave and connect it to the cable for
/dev/hdb and see what happens.  The master drive (/dev/hda) should be
connected to the black connector and the slave drive (/dev/hdb) should
be connected to the gray connector.