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Copyright © 2014 EMC Corporation. All Rights Reserved.
Block Storage Provisioning and Management
Upon completion of this module, you should be able to:• Describe configuration guidelines for provisioning storage• Configure and manage storage objects
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Block Storage Provisioning and Management
This lesson covers the following topics:• General considerations• Storage Pools and RAID Groups• LUNs
Lesson 1: VNX Storage Objects
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Copyright © 2014 EMC Corporation. All Rights Reserved.
General Considerations for Configuring Storage• Drive types
Drives selection should be based upon the expected workload FLASH for extreme performance SAS for general performance NL-SAS for streaming, aging data and archives, and backups
• RAID levels Match the appropriate RAID level with the expected workload
RAID 1/0 for heavy transactional random writes (> 25%) RAID 5 for medium-high performance, general workloads, and
sequential I/O RAID 6 for NL-SAS read-based workloads and archives
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Pool vs. RAID Group
Extreme Performance Tier (SSD)
Performance Tier (SAS)
Capacity Tier (NL-SAS)
RAID 1/0: (4+4)
RAID 5: (8+1) RAID 5: (8+1)
RAID 6: (14+2)
Pool Example
RAID 1/0: (4+4)
RAID 5: (8+1)
RAID 6: (14+2)
RAID 5: (4+1)
RAID 6: (6+2)
RAID Group 0
RAID Group 1
RAID Group 2
RAID Group 3
RAID Group 4
RAID Group Examples
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Pool Considerations
Pools can contain a few or hundreds of disks• Spreads workloads over many resources• Can contain a single drive type (homogeneous) or multiple drive
types (heterogeneous)• Building blocks for FAST VP operations
RAID Configuration is moved from the pool level to the tier level
• Users can select RAID protection by tier• Mixed RAID types supported within a Pool• Once the tier is created, the RAID Configuration for that tier in that
pool cannot change
Multi-Pool Support• Separate workloads for different I/O profiles• Dedicate resources for performance goals
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RAID Group Considerations
•Limited to a single drive type and a maximum of 16 drives per RAID group
Drive count
•Drives can be selected from the same bus (horizontal) or different busses (vertical)
•Best practice is to use horizontal selection
Drive location
•Used on 4 +1 RAID 5 groups when the predominant workload is large-block random read activity
Large element size
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Thick LUNs
Capacity of a thick LUN, is distributed equally across the disks in the pool
• Full capacity allocated at time of creation
Capacity of a thick LUN, same as the user capacity seen by the server
Uses slightly more capacity than user data
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Thin LUNs
Capacity visible to the server is independent of the available physical storage in the pool
Competes with other LUNs in the pool for the pool’s available storage
A thin LUN can run out of disk space if the pool to which it belongs runs out of disk space
A thin LUN uses slightly more capacity than the amount of user data written to it due to the metadata
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Classic LUNs
Created on RAID Groups
All space allocated at creation time
• LBAs are physically contiguous
Predictable performance and data layout
Support active-active host access
• Simultaneous access through SPA and SPB• Trespassing of LUNs no longer required
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Block Storage Provisioning and Management
During this lesson the following topics were covered:• General considerations• Storage Pools and RAID Groups• LUNs
Lesson 1: Summary
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Block Storage Provisioning and Management
This lesson covers the following topics:• Creating Storage Pools• Creating LUNs• Displaying and monitoring storage objects
Lesson 2: Managing Storage Objects
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Provisioning Storage with Unisphere
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The Pools tab is selected by default
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Creating a Storage Pool
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Multiple combo boxes will be shown
for the level of performance that can be achieved with the installed disk types
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Creating a Pool LUN
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Thin LUNs are created by default. To create a Thick LUN uncheck the
Thin box.
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Displaying Pool Properties (General Tab)
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Displaying Pool Properties (Disks Tab)
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Displaying Pool Properties (Advanced Tab)
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Displaying Pool Properties (Tiering Tab)
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Displaying Pool LUN Properties (General Tab)
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Displaying Pool LUN Properties
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Creating a Storage Pool: RAID Group (General Tab)
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Users have the option to manually select the disks for
the RAID Group
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Creating a Storage Pool: RAID Group (Advanced Tab)
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Creating a RAID Group LUN (General Tab)
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Creating a RAID Group LUN (Advanced Tab)
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Displaying RAID Group Properties
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Displaying RAID Group LUN Properties (General Tab)
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Displaying RAID Group LUN Properties
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Block Storage Provisioning and Management
During this lesson the following topics were covered:• Creating Storage Pools• Creating LUNs• Displaying and monitoring VNX storage
Lesson 2: Summary
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Summary
Key points covered in this module:• Described characteristics of VNX storage objects such as pools,
LUNs, disks, and RAID Groups.• Considerations for employing the different storage object
options• Both thick and thin LUNs can share the same pool• Steps to create Pool and RAID Group storage pools, and thin and
thick LUNs from these pools.
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