Messages in this thread | | | From | (Scott Lurndal) | Subject | Re: kiobuf using kernel pages | Date | Thu, 18 Nov 1999 18:07:40 -0800 (PST) |
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> > primarily useful for high-performance disk I/O (e.g. for Oracle) > > which is not a strength of IDE/EIDE/UDMA devices, and > > the block device can always be used on IDE devices, it's just > > slower (and may affect the page cache behavior). > > The highest performance I/O devices we support right now are not SCSI > interfaced at the Linux<->PCI level. Neither the DPT Millenium in I2O block > mode or the DAC960 are presenting SCSI interfaces. > > Alan > >
We use fibrechannel here, which is quite high performance, and does present a SCSI interface.
For other devices, such has single-board hardware raid solutions, other ways of doing raw character disk I/O will need to be devised (e.g. the hba/driver for DPT millenium or DAC960 need to register the appropriate character special device and provide file_operations to handle the I/O).
Or sct's /dev/raw could be used (where I/O requests will be broken up into uniform chunks rather single requests being sent to the host bus adapter).
scott
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