HP XP P9500 Storage - Manual (Page 285)

Description Item
• Performance Utilization: Not available.
•
Buffer Space (New page assignment/Tier relocation): Buffer spaces for new
page assignments and tier relocation of tier 2.
Tier 3 is the less frequently accessed and low-speed hierarchy. Tier 3
•
Drive Type/RPM: The drive type and rpm of tier 3.
•
Capacity (Used): The used capacity of tier 3.
• Performance Utilization: Not available.
•
Buffer Space (New page assignment/Tier relocation): Buffer spaces for new
page assignments and tier relocation of tier 3.
The following table describes the details of the performance graph when LDEV information is
presented.
Description Item
LDEV name and identifier. Performance Graph (LDEV
name
(LDEV ID))
The vertical scale (y axis) indicates the average number of I/Os per hour. The
horizontal scale (x axis) indicates the total capacity (in GB) of pages allocated
to the THP V-VOL in all three tiers. Performance Graph
Indicates the boundaries of I/O per hour for Tier 1. Tier1 Range
Indicates the boundaries of I/O per hour for Tier 2. Tier2 Range
Start time and end time of performance monitoring. Footer area
If acquisition of the performance graph fails, the Warning icon appears along
with an error message and solution. An error code appears in parentheses.
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.
View Tier Properties window 285