Hi,

I have a Lenova Machine with RHEL5 installed. Recently I noticed that I am facing slow speed because of my hdd dma has been disabled.

[root@Maxy ~]# hdparm /dev/hdc

/dev/hdc:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 36481/255/63, sectors = 586072368, start = 0

I try to enable the dma by running the command
[root@Maxy ~]# hdparm -d1 /dev/hdc

/dev/hdc:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

But it remains unchanged. Anybody have an idea about it.

try -X69 -d1 or -X66 -d1
http://linuxdevcenter.com/pub/a/linu...rm.html?page=2

Hi,

How can I find out which ATA I have.

Hi,

You can use 'hdparm -I /dev/hdc' from the command line. Do a 'man hdparm' to understand the usage.

Hi I have the output of the command as follows.
How can i find the ATA version.


[root@Maxy bin]# hdparm -I /dev/hdc

/dev/hdc:

ATA device, with non-removable media
Model Number: ST3300822AS
Serial Number: 4NF2AJ5L
Firmware Revision: 3.AAE
Standards:
Supported: 7 6 5 4
Likely used: 7
Configuration:
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
--
CHS current addressable sectors: 4128705
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 586072368
device size with M = 1024*1024: 286168 MBytes
device size with M = 1000*1000: 300069 MBytes (300 GB)
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 16
Recommended acoustic management value: 208, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5 udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* DOWNLOAD_MICROCODE
SET_MAX security extension
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
* SATA-I signaling speed (1.5Gb/s)
* SATA-II signaling speed (3.0Gb/s)
* Native Command Queueing (NCQ)
* Phy event counters
* Software settings preservation
Security:
Master password revision code = 65534
supported
not enabled
not locked
frozen
not expired: security count
not supported: enhanced erase
Checksum: correct

for UltraDMA, the value is the desired UltraDMA mode number plus 64. -X70

p.s. look at using sdparm instead of hdparm for sata.

p.s.s. (c) http://www.gentoo-wiki.info/Hdparm

Hi,

Is this your drive? If so, then it is a SATA.

Do you have the correct drivers installed?

BTW, please place your long list or data within the vbcode tags # or quote. The # & Quote are at the top of the reply window. Quote is the balloon to the left of the #. This makes your post cleaner therefore easier to read.

I have the BIOS Configuration for IDE like this:-
Parallel ATA: Disabled
Serial ATA: Enabled
Native Mode Operation: Automatic

There is one more option is there for Native mode Serial ATA

Which option is required for the Linux to recognize the disk as sata?

Hi,

Thanks for the Information.

I Changed the Native mode : Serial ATA

Then it is showing the HDD as sata

Now my device list as /dev/sda

and I got performance like normal system.