Messages in this thread | | | Date | Sat, 29 May 1999 10:44:55 -0700 (PDT) | From | Tim Smith <> | Subject | Re: XFS and journalling filesystems |
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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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