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nbdwt73
 Post subject: DMA for a SATA drive
PostPosted: Wed Sep 06, 2006 7:18 pm 
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Joined: Wed Jan 07, 2004 12:14 pm
Posts: 434
Location: Charlotte, NC
I have added a 500 gig SATA drive to my back end (in a VG with other IDE drives). I have searched for a definitive answer to this but cannot find specific consensus... I am unable to set DMA on this SATA drive (HDIO_SET_DMA failed: Inappropriate ioctl for device. The BIOS doesn't even reference DMA for this controller) and am curious... Given the performance is good (hdparm tests show good buffer and cache reads) is it necessary (or possible) to set DMA 'on' for SATA? I am also asking a theoretical question here... given the way SATA works, is this protocol even applicable?

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abrendel
 Post subject:
PostPosted: Thu Sep 07, 2006 12:45 pm 
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Joined: Tue Feb 21, 2006 10:55 am
Posts: 98
The protocol is not applicable to SATA disks. You dont have to set it or worry about it.
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