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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.
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TPP Thresholds
There are two TPP usage thresholds: Attention and Warning.
Table 15 TPP Thresholds
Threshold
Selectable range
Default
Setting conditions
Attention
5 (%) to 80 (%)
75 (%)
Attention threshold
£
Warning threshold
The "Attention" threshold can be omitted.
Warning
5 (%) to 99 (%)
90 (%)
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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
Selectable range
Default
Attention
1 (%) to 100 (%)
80 (%)
•
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.
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
45
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AM-7722-25ENZ0
Summary of Contents for ETERNUS DX500 S3/DX600 S3
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