As a start - Multistreaming on a single drive is never a good idea See p. 118 & 119 of
Admin Guide 1 :
p. 119:
Multiple concurrent streams from a single device can adversely affect backup times.
You have a couple of choices as far as Backup Selection is concerned:
-
ALL_LOCAL_DRIVES where a job will be spawned for each logical drive letter (a single job for c:\)
-
Explicitely specifying files/folders (will probably cause status 71's if directories are dynamically created/deleted)
-
Using wildcards: Allowing multiple datastreams with a backup selection of e.g. c:\data\* will spawn a separate backup job for each file/folder in c:\data
Backup selection options are described in above manual p. 171 under topic 'Allowing multiple data streams' and 175.
We had great success splitting up a big raid5 lun into multiple streams (data not on single physical drive):
NEW_STREAM
X:\users\a*
X:\users\b*
X:\users\c*
X:\users\d*
X:\users\e*
NEW_STREAM
X:\users\f*
X:\users\g*
X:\users\h*
X:\users\i*
X:\users\j*
X:\users\k*
NEW_STREAM
X:\users\l*
X:\users\m*
X:\users\n*
X:\users\o*
X:\users\p*
......
It took a couple of weeks to balance out the streams, but to cut a long story short, 72 hours of backing up drive X was cut down to about 12 hours.
Again - NOT recommended for single physical spindle (such as c-drive)
