HP XP P9500 Storage - Manual (Page 288)

Description Item
• Performance Utilization: Not available.
•
Buffer Space (New page assignment/Tier relocation): Buffer spaces for new
page assignments and tier relocation of tier 3.
* If multiple types exist in a tier, Mixed is displayed. When the volume is the external volume, Drive Type displays
External Storage and the value of the external LDEV tier rank.
The following table describes the details of the performance graph when LDEV information is
presented.
Description Item
Displays the LDEV name and ID. Performance Graph (LDEV
name
(LDEV ID))
Displays the performance graph. Performance Graph
The vertical scale indicates the average I/O per hour. The horizontal scale
indicates the capacity.
Displays the Tier1 range. Tier1 Range
Displays the Tier2 range. Tier2 Range
Displays the start time and end time of the performance monitoring. Footer area
When acquisition of the performance graph fails, the Warning icon is
displayed along with an error message and solution. In the parentheses, an
error code is displayed.
The following describes how to read the performance graph when LDEV
information is presented.
The vertical scale of the graph indicates an average number of I/Os by each hour and the horizontal
scale indicates a capacity, in GB, of the area where the I/Os are performed. In the screen above,
the first dot shows approximately 1,500 I/Os on the vertical scale and 0 GB on the horizontal
scale. The second dot shows approximately 1,100 I/Os and 20 GB. The third dot shows
approximately 1,050 I/Os and 38 GB.
This indicates that 20 GB of capacity is available of over 1,100 I/Os but less than 1,500 I/Os
between the first dot and the second dot, and 18 GB (38 GB - 20 GB) of capacity is available of
over 1,050 I/Os but less than 1,100 I/Os between the second dot and the third dot. The I/O
counts on a dot were processed on the capacity subtracted the previous dot's capacity from the
dot's capacity.
The two lines in the graph indicate tier 1 range and tier 2 range. These ranges are calculated
when the collection of performance monitoring data is complete (monitoring period is completed).
They show the boundary of each tier.
The sample graph shows 1,050 I/Os for tier 1 range, and 200 I/Os for tier 2 range. This case
means the area with 1,050 or more I/Os moves to tier 1, the area with over 200 I/Os but less
than 1,050 I/Os moves to tier 2, and the area with less than 200 I/Os moves to tier 3. However,
the area in the appropriate tier does not move. When the cursor is placed on a dot of the graph,
the information such as average I/O counts, capacity, and tier range appears on the dot.
When no I/Os are in the lower tier with multiple tiers, the tier range line is placed at 0 on the
vertical scale.
288 Thin Provisioning Z and Smart Tiers Z GUI reference