Hewlett-Packard StorageWorks 12000 - Virtual Library System EVA Gateway Manual
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NotesValue
Command
1
Default63TCPWINDOWSIZE
Default32768BUFPOOLSIZE
Default256TXNGROUPMAX
Default = 24. When setting this to
0, use an administrative schedule
to execute expiration at an appro-
priate time each day. A value of
0 means the expiration must be
started with the EXPIre Inventory
command.
0EXPINTERVAL
DefaultNOSELFTUNEBUFPOOLSIZE
Default1000MOVEBATCHSIZE
Default2048MOVESIZETHRESH
Default = 5122048 to 8192LOGPOOLSIZE
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 29 Recommended Settings for each Backup-archive Client's dsm.sys File (dsm.opt File for
Windows)
NotesValue
Command
1
Default32TCPBUFFSIZE
DefaultYESTCPNODELAY
Default63TCPWINDOWSIZE
Default = NOYESLARGECOMMBUFFERS
For backup to tape/virtual tape
only.
2097152TXNBYTELIMIT
TSM Deduplication Guidelines
In addition to the TSM general guidelines, the following guidelines apply to a VLS with deduplication
enabled:
• Incremental forever: The TSM (Tivoli Storage Manager) "incremental forever" scheme of backups
are all effectively treated as full backups by the deduplication, so every new backup is compared
against the previous backup. With file server backups that contain just the modified files, this may
result in lower deduplication ratios because most or all of the new backup data is unique, but
database backups (which are normally the entire database every time) will give normal deduplic-
ation ratios.
• Mount retention: You must set the mount retention to 0 (zero) for your server configuration as follows:
dsmadmc -id=admin -pass=admin update devclass <vtlclass> mountret=0
Substitute the password for “admin” above with your TSM server admin password.
Virtual Library Systems200