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Pool Name
Pct Pct
---------- ---------- --------- ---- ----- ---- ---
TAPEDATA
6.3.2 Defining a random access disk storage pool
Define a primary disk storage pool using the define stgpool command with the
predefined device class of DISK. Some of the options you should consider are:
NEXTstgpool: defines the next storage pool in the hierarchy. NEXTstgpool is
where migrated data is sent, or files exceeding MAXSIze (see below).
MAXSIze: the maximum size a file can be to be stored in the storage pool.
Any file over this size is written to the next storage pool. If NEXTstgpool is not
defined, the store operation for the file fails.
HIghmig: the threshold at which migration starts. When the storage pool
reaches this percentage of its capacity, a migration process will begin to
move the data to the NEXTstgpool.
LOwmig: when migration stops. When migration is running, if the utilization of
the pool falls to or below this value, migration stops.
CAChe: specifies whether a copy of a migrated file is cached in the pool after
migration to the next pool. Caching files can improve restore performance,
but may cause other processes to suffer. For example, if a disk pool is full of
cached files, when a client backs up new data into that pool, the server must
find suitable cached files to remove and provide free space for the new data.
Example 6-10 defines a storage pool named DISKDATA with a high migration
threshold of 80% and a low migration threshold of 30%. We also create the
dummy pool NONE. Both use the predefined device class of DISK.
Example 6-10 Defining a random access DISK storage pool
tsm: ATLANTIC>
nextstgpool=tapedata maxsize=1G highmig=80 lowmig=30
ANR2200I Storage pool DISKDATA defined (device class DISK).
tsm: ATLANTIC>
ANR2200I Storage pool NONE defined (device class DISK).
tsm: ATLANTIC>
Storage
Pool Name
Pct Pct
---------- ---------- --------- ---- ----- ---- ---
Class Name
Capacity Util
LTO2-DC
0.0 M
define stgpool DISKDATA disk description="Disk storage pool"
define stg none DISK
q stgp
Device
Estimated
Class Name
Capacity Util
Migr
Mig Mig
0.0
0.0
90
70
Pct
Pct High Low
Migr
Mig Mig
Chapter 6. Data storage
Pool
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Next Storage
Pool
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233
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