Tom Lane wrote:
> Bruno Wolff III <bruno@wolff.to> writes:
> > Are you sure about that? That would probably be the normal case, but are
> > you promised that the hardware will write all of the sectors of a block
> > in order?
>
> I don't think you can possibly assume that. If the block crosses a
> cylinder boundary then it's certainly an unsafe assumption, and even
> within a cylinder (no seek required) I'm pretty sure that disk drives
> have understood "write the next sector that passes under the heads"
> for decades.
SCSI tagged queueing certainly allows 512-byte blocks to be reordered
during writes.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square,
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