Tsm Deduplication Guidelines; All Firmware Versions - HP 12000 Design Manual

Table 24 Recommended Settings for each TSM Server's dsmserv.opt File or Storage Agent's
dsmsta.opt
Command
TCPNODELAY
TCPWINDOWSIZE
BUFPOOLSIZE
TXNGROUPMAX
EXPINTERVAL
SELFTUNEBUFPOOLSIZE
MOVEBATCHSIZE
MOVESIZETHRESH
LOGPOOLSIZE
1 These settings have been tested and verified on all EBS-supported platforms. However, there may be additional
factors that might require further adjustments of these variables. See the IBM Tivoli Storage Manager Performance
Tuning Guide, available on the IBM support web site, for more information.
Table 25 Recommended Settings for each Backup-archive Client's dsm.sys File (dsm.opt
File for Windows)
Command
TCPBUFFSIZE
TCPNODELAY
TCPWINDOWSIZE
LARGECOMMBUFFERS
TXNBYTELIMIT

TSM Deduplication Guidelines

In addition to the TSM general guidelines, the following guidelines apply to a VLS with deduplication
enabled.

All Firmware Versions

Tape Retention Planning: Create media pools based on retention period. Mixing retention
periods will prevent cartridges expiration reclamation and will lead to poor storage utilization.
Space used for the shorter retention backup is not reclaimed until all backups on the tape are
expired. That is, the backup application cannot reuse/reformat the tape until all backups are
past their protection period.
NOTE:
relabeled which eliminates the need for the TSM administrator to manually relabel scratch
cartridges to reclaim space.
SQL TDP or Flat File Backups: To enable deduplication of these backups you must set the
number of stripes to one.
144 VLS Configuration and Backup Application Guidelines
1
Value
YES
63
32768
256
0
NO
1000
2048
2048 to 8192
1
Value
32
YES
63
YES
2097152
TSM version 5.5.2 has a feature that allows scratch tapes to be automatically
Notes
Default
Default
Default
Default
Default = 24. When setting this to 0,
use an administrative schedule to
execute expiration at an appropriate
time each day. A value of 0 means
the expiration must be started with
the EXPIre Inventory command.
Default
Default
Default
Default = 512
Notes
Default
Default
Default
Default = NO
For backup to tape/virtual tape only.