On Wed, 11 Jan 2006, Ian C. Blenke wrote:
> Eben King wrote:
>
> >But copying data between the drives will be subject to a 50% slowdown, as
> >the source drive writes to RAM, then the destination drive reads from RAM.
> >Can't do them simultaneously, as there's only one cable. Each drive
> >evaluated independently, though, would be as Mr. Blenke said.
>
> Not true. If the bus can transfer 300MB/s, and the disks can only
> read/write at 50MB/s, there is plenty of bus time to copy the buffers
> to/from the host. This is what buffers are for.
Son of a gun, you appear to be right. Nightly I copy hda -> hdb (identical
"120 GB" drives), and on Jan 9 it took 1:10:40.484, which is 27.8 MB/s. And
all this time... never mind.
-- -eben ebQenW1@EtaRmpTabYayU.rIr.OcoPm home.tampabay.rr.com/hactar LEO: Now is not a good time to photocopy your butt and staple it to your boss' face, oh no. Eat a bucket of tuna-flavored pudding and wash it down with a gallon of strawberry Quik. -- Weird Al----------------------------------------------------------------------- This list is provided as an unmoderated internet service by Networked Knowledge Systems (NKS). Views and opinions expressed in messages posted are those of the author and do not necessarily reflect the official policy or position of NKS or any of its employees.
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