Table 15 Tpp Thresholds; Table 16 Tpv Thresholds - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
●
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 15 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 16 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 alloca-
tion 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 capacity because expanded volumes may not be recognized by some types and ver-
sions of server-side platforms (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 appli-
cation that does not support Advanced Format.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Selectable range
5 (%) to 80 (%)
5 (%) to 99 (%)
Selectable range
1 (%) to 100 (%)
44
Copyright 2023 Fujitsu Limited
Default Setting conditions
75 (%) Attention threshold £ Warning thresh-
old
90 (%)
The "Attention" threshold can be
omitted.
Default
80 (%)
P3AM-7642-32ENZ0