On Fri, 4 Dec 1998, Pete Popov wrote:
> The lower than expected performance is most likely due a small SCSI transfer
> size. I increased the default 32K to 128K, recompiled the st driver, and use 128K
> with tar and regularly get 70MB/s with my SDT-7000.
Since I got around half the advertised speed, I just started wondering if
maybe I'd accidentally done the backups with compression off...but I
double checked, and my script did have mt set compression on.
> The 1.5MB/s (90MB/min) spec is the actual transfer rate to tape. You'll
> need an extremely fast host with low SCSI command overhead to get close
> to that.
The system used as the tape host is a lowly P100, but does have a nice new
Diamond Fireport 40. Maybe it just can't keep up.
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