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Optimizing disk performance in NT4

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Optimizing disk performance in NT4
Hi Everyone,

I am trying to optimize read/write performance to disk drives. The disk
drive is the initiator of a DMA. The ATA-66 drives that I have tested work
best when the DMA size is around 512KB. The Raid drives that I have tested
work best when the DMA size is 2MB or above. Do these numbers(512KB and
2MB) coorespond to the amount of cache memory that is either on the disk
controller, on the disk itself, or a combination? If the numbers do
coorespond to the amount of cache memory is there a way for an NT4.0 driver
to determine this cache size? Is there a way to tell what size DMA chunck
to use for optimum performance?


Please reply to: [email protected]
Marty Corbett
Integrated Computing Engines (ICE)

Comments

  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    > drive is the initiator of a DMA. The ATA-66 drives that I have tested
    work
    > best when the DMA size is around 512KB. The Raid drives that I have

    Very strange. AFAIK ATAPI DMA controller is capable only of 16 pages
    transfers - which is 64K.

    Max
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