m15 flexshare final
TRANSCRIPT
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FlexShare
Module 15
Data ONTAP 7.3 Fundamentals
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Module Objectives
By the end of this module, you should be able to:
Describe and use FlexShare to tune and
improve performance
Monitor FlexShare performance changes
Describe specific cases that could benefit from
quality of service (QOS) improvements using
FlexShare
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FlexShare
FlexShare facilitates increased storage resource
control in the following ways:
Volume priorities
Hints of cache buffers
No license required
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FlexShare Application Scenarios
Scenario 1A mission-critical database is on the
same storage system as user home directories Use FlexShare to ensure that database accesses
are assigned a higher priority than accesses tohome directories
Scenario 2System operations are negativelyimpacting client accesses Use FlexShare to ensure that client accesses are
assigned a higher priority than system operations
Scenario 3Volumes have different cachingrequirements
A database log volume that does not need to be
cached after writing
Use the cache buffer policy hint to help DataONTAP determine how to manage the cache buffers
for volumes with different caching requirements
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FlexShare Characteristics
No performance guarantees
Priority levels are relative
Both nodes in an active-active configuration
Must have the priority feature enabled
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Effects of Volume Operations on FlexShare
Priorities
Volume Operation Effect on FlexShare Settings
Deletion FlexShare settings removed
Rename FlexShare settings unchanged
FlexClone Volume Creation Parent volume settings unchanged
FlexShare settings for new FlexClone
volume unset (as for a newly created
volume)Copy Source volume settings unchanged
FlexShare settings for destination
volume unset (as for a newly created
volume)
Offline or Online FlexShare settings preserved
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Global I/O Concurrency Option
FlexShare limits concurrent I/O based on the
following criteria:
Volume priority
Disk type
The default for most applications is the correctvalue
Change concurrent I/O for nonstandard disks
or loads
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Assigning Priorities to Volume Data
Access
To assign priorities to volume data access:
1. Ensure that FlexShare is enabled:
priority on
2. Specify the priority for a volume:
priority set volume vol_name
level=priority_level
3. (Optional) Verify the priority level:
priority show volume [-v] vol_name
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Assign Priorities to System and User
Operations
To assign priorities to system and user
operations:
1. Ensure that FlexShare is enabled:
priority on
2. Specify the priority:priority set volume vol_name system
3. (Optional) Verify the volume priority levels:
priority show volume -v vol_name
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Buffer Cache Policy
Settings:
Keep
Reuse
Default
Setting policy:
Priority on
Priority set volume vol_name
cache=policy
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Removing or Disabling FlexShare Policies
To temporarily disable FlexShare priority:
system> priority set volume [volname]
service=off
To remove FlexShare priority:
system> priority delete volume[volname]
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Default Volume Priority
To specify or modify the default volume priority:
priority set default option=value
[option=value]
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Module Summary
In this module, you should have learned to:
Describe and use FlexShare to tune and
improve performance
Monitor FlexShare performance changes
Describe specific cases that could benefit fromquality of service (QOS) using FlexShare
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Exercise
Module 15: FlexShare
Estimated Time: 30 minutes
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Answers
Module 15: FlexShare