Fujitsu ETERNUS AF S3 Series, Руководство по конструкции

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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 23 TPP Thresholds
Threshold Selectable range Default Setting conditions
Attention 5 (%) – 80 (%) 75 (%) Attention threshold £ Warning threshold
The "Attention" threshold can be omitted.
Warning 5 (%) – 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 24 TPV Thresholds
Threshold Selectable range Default
Attention 1 (%) – 100 (%) 80 (%)
Caution
• Use of Thin Provisioning is also not recommended when the OS writes meta information to the
whole LUN during file system creation.
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TPVs should be backed up by file. 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 instead of TPPs.
• 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 versions of server-
side platforms (OSs).
2. Basic Functions
Operations Optimization (Deduplication/Compression and Storage Virtualization)
52 Design Guide