Subject: Mammoth write speed
Date: Wed, 18 Feb 1998 11:55:12 -1000
From: Don Mickey <mickey@ahinahina>

I just tried writing a 410 Mb file to the Exabyte Mammoth drive. I used dd,
with bs=32k. Takes 88.3 seconds, i.e. 4.64 Mb/sec. Larger block size
doesn't help much. This is better than the 0.24 Mb/s we get with the old
drives. Disk 1 to disk 2, both on the external ultra-scsi bus, takes 51.7 sec,
about 7.9 Mb/s. The internal bus must be slower, since data1->work took 62 s.


Subject: IVM upgrade progress--wraw
Date: Fri, 27 Feb 1998 15:06:18 -1000
From: Don Mickey <mickey@ahinahina>

I've recoded wraw. Wrote a test program which reads the 8MB memory 
board from the POI system and writes the contents to a disk file, eight
times. Takes 15.44 seconds to write 67+ megabytes of data to disk.
And 19.0 seconds to write the same amount to tape.

So writing one image should take maybe 30 msec? Not bad.
-- 


     Last modified: Wed Mar 25 14:24:16 HST 1998