Table 17 Tpp Thresholds; Table 18 Tpv Thresholds - Fujitsu ETERNUS AF250 Design Manual

1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
Perform a TPV/FTV capacity optimization if "Thick" has changed to "Thin". By optimizing the capacity, the area
that was allocated to a TPV is released and the TPV becomes usable. If a TPV/FTV capacity optimization is not
performed, the usage of the TPV does not change even after the Allocation method is changed.
The capacity of a TPV can be expanded after it is created.
●
Threshold Monitoring of Used Capacity
When the used capacity of a TPP reaches the threshold, a notification is sent to the notification destination,
(SNMP Trap, e-mail, or Syslog) specified using the [Setup Event Notification] function. There are two types of
thresholds: "Attention" and "Warning". A different value can be specified for each threshold type.
Also, ETERNUS SF Storage Cruiser can be used to monitor the used capacity.
TPP Thresholds
•
There are two TPP usage thresholds: Attention and Warning.

Table 17 TPP Thresholds

Threshold
Attention
Warning
TPV Thresholds
•
There is only one TPV usage threshold: Attention. When the physically allocated capacity of a TPV reaches the
threshold, a response is sent to a host via a sense. The threshold is determined by the ratio of free space in the
TPP and the unallocated TPV capacity.

Table 18 TPV Thresholds

Threshold
Attention
Use of TPVs is also not recommended when the OS writes meta information to the whole LUN during file
•
system creation.
TPVs should be backed up of files as sets of their component files. While backing up a whole TPV is not
•
difficult, unallocated areas will also be backed up as dummy data. If the TPV then needs to be restored from
the backup, the dummy data is also "restored". This requires allocation of the physical drive area for the
entire TPV capacity, which negates the effects of thin provisioning.
For advanced performance tuning, use standard RAID groups.
•
Refer to the applicable OS and file system documentation before dynamically expanding the volume ca-
•
pacity because expanded volumes may not be recognized by some types and versions of server-side plat-
forms (OSs).
Selectable range
5 (%) to 80 (%)
5 (%) to 99 (%)
Selectable range
1 (%) to 100 (%)
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
Default Setting conditions
Attention threshold £ Warning threshold
75 (%)
The "Attention" threshold can be omitted.
90 (%)
48
Default
80 (%)
P3AG-1822-09ENZ0