Table 12 Tpp Thresholds; Table 13 Tpv Thresholds; Figure - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
Operations Optimization (Virtualization)
Thick
-
When creating a volume, the physical area is allocated to the entire volume area. This can be used for vol-
umes in the system area to prevent a system stoppage due to a pool capacity shortage during operations.
In general, selecting "Thin" is recommended. The Allocation method can be changed after a TPV is created.
Perform a TPV 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 capacity optimization is not per-
formed, 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.
For details on the number of TPVs that can be created, refer to
●
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 12 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 13 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).
If a TPP includes one or more RAID groups that are configured with Advanced Format drives, all TPVs created
•
in the relevant TPP are treated as Advanced Format volumes. In this case, the write performance may be
reduced when accessing the relevant TPV from an OS or an application that does not support Advanced For-
mat.
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
Selectable range
5 (%) to 80 (%)
5 (%) to 99 (%)
Selectable range
1 (%) to 100 (%)
38
Copyright 2019 FUJITSU LIMITED
"Volume" (page
Default Setting conditions
75 (%) Attention threshold £ Warning threshold
The "Attention" threshold can be omitted.
90 (%)
Default
80 (%)
22).
P3AM-8992-14ENZ0