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SearchWin2000.com's Administrator Tip
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TODAY'S ADMINISTRATOR TIP: Use DMA to save time
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"Use DMA to save time"
By Mike Marney
Your users want their workstations to go really fast. You want your
servers to run really fast. Enabling DMA on your drives, as Mike
Marney tells us in this tip, will help.
Many new hard drives come with ability to use DMA (Direct Memory
Access), making the input/output of the drive run at a higher speed.
This will lower the CPU usage of the system when writing to the drive
from 90 percent to less than 30 percent.
NOTE: This tip involves editing the Registry. Make sure that you have
a valid backup available for the Registry of the machine. That way,
if you do something invalid, you can get back to where you started.
To verify that DMA is enabled on your machine, use your favorite
Registry editor to edit the Registry key.
HKEY_LOCAL_MACHINEHARDWAREDEVICEMAPScsiScsiPortX
where X is 0 for the primary channel and 1 for the secondary channel.
If the setting of the DMAEnabled value is 1, then DMA is turned on.
ATAPI can also turn on DMA on a channel-by-channel basis, provided
the channels are capable of using DMA. To turn DMA on for a channel,
apply the following registry change.
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices
atapiParametersDeviceX
"DriverParameter" = "DMADetectionLevel = 0x1."
To disable DMA, set the string to
"DMADetectionLevel = 0x0."
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