Ref: 11640010
Title: Speed of 3+Backup for Macintosh Files
Date: 8/15/88

Copyright 3Com Corporation, 1991.  All rights reserved.

Both the 3S/20x and 3S/40x servers are shipped loaded with
3+Backup, and both series of servers can be purchased with pre-
installed tape units.  The 3S/200 supports both 60MB and 150MB
tape units, while the 3S/400 supports 150MB tape units.

The following indicates the backup speeds that you can expect with
3+Backup 1.3.x.


                        Online            Offline
3S/200

 Local               3-4  MB/min.        4-5 MB/min.
 Remote            1-2  MB/min.           n/a


3S/401

 Local               3-4 MB/min.    4-5 MB/min.
 Remote             2-3 MB/min.          n/a


Factors that affect backup speeds include:

 * size of CIOSYS buffers

 * directory structure

 * type of backup: a full backup will take longer than an
incremental backup

 * file size:  large files will take longer to back up than small
files

 * number of open files (on-line only)
