Re: XFS and journalling filesystems

Tim Smith (tzs@tzs.net)
Sat, 29 May 1999 10:44:55 -0700 (PDT)

On Thu, 27 May 1999, Theodore Y. Ts'o wrote:
> DMA in and out of memory, I was appropriately horrified. I'm glad to
> hear it wasn't true, and that you had no part in implementing or
> designing such a horrible hack (i.e., direct device-to-device I/O). :-)

Is direct device-to-device I/O always bad? Many SCSI devices support
the SCSI "copy" command, which allows them to copy a range of blocks from
one SCSI device to another SCSI device. It could be interesting to tell
a disk to back itself up to the tape drive, or to implement mirroring
by letting the disk do it.

--Tim Smith

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