Data Protection
325
Titan SiliconServer
NDMP_BLUEARC_READAHEAD_PROCESSES
NDMP_BLUEARC_SNAPSHOT_DELETE
NDMP_BLUEARC_TAKE_SNAPSHOT
Possible value
Notes
0 to 10
(In exceptional cases
could be increased to
as many as 30.)
This variable can control the number of read-ahead processes used when
reading directory entries in the backup or copy operation. Remember
that each additional readahead process takes up resources, so it is best
to limit the number of additional processes unless it makes a significant
difference in performance.
The default for this value can be set using the “ndmp-option
readahead_procs” CLI command. It will be 1 if not set explicitly.
A value of 0 will disable directory readahead. This is a reasonable option
where file sizes are large.
Values from 1 to 10 might be used when reading file systems with smaller
files. Where most of the files are very small (16 KB or less) then it may be
useful to use 10 processes.
In extreme cases, where most of the deepest level directories have only
one or two files and those files are very small, it may be useful to
increase the amount of second level readahead used with the CLI
command “ndmp-option ext_readahead”. If this second level readahead
option is set to a higher value such as 10, then setting readahead
processes up to a value of 30 might be advisable.
Possible value
Notes
IMMEDIATELY
LAST or OBSOLETE
This variable overrides the setting of the Automated Snapshot Deletion
field in the Backup > Snapshot Options page of the GUI. IMMEDIATELY
gives the same effect as “Delete snapshot after use”, LAST is the same as
“Delete snapshot after next backup” and OBSOLETE is the same as
“Delete snapshot when obsolete”.
Possible value
Notes
y or n
Used to override the "Automatic Snapshot Creation" Backup configuration
option.
