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Clustered Data ONTAP® 8.3
Physical Storage Management Guide
Updated for 8.3.2
Managing disks using Data ONTAP
How Data ONTAP reports disk types
Storage connection types and topologies supported by Data ONTAP
How disks can be combined for the SAS storage connection type
How disks can be combined for the FC-AL storage connection type
Methods of calculating aggregate and system capacity
Disk speeds supported by Data ONTAP
How drive checksum types affect aggregate and spare management
Drive name formats
Pre-cluster drive name formats
Loop IDs for FC-AL connected disks
Understanding RAID drive types
How disk sanitization works
Disk sanitization process
When disk sanitization cannot be performed
What happens if disk sanitization is interrupted
Tips for creating and backing up aggregates containing data to be sanitized
How Data ONTAP monitors disk performance and health
What happens when Data ONTAP takes disks offline
How Data ONTAP reduces disk failures using Rapid RAID Recovery
How the maintenance center helps prevent drive errors
When Data ONTAP can put a disk into the maintenance center
How Data ONTAP uses continuous media scrubbing to prevent media errors
How continuous media scrubbing impacts system performance
Why continuous media scrubbing should not replace scheduled RAID-level disk scrubs
How you can use ACP to increase storage availability for SAS-connected disk shelves
How you use SSDs to increase storage performance
How you manage All Flash FAS models differently from FAS models
How Data ONTAP manages SSD wear life
Capability differences between SSDs and HDDs
Guidelines and requirements for using multi-disk carrier storage shelves
How Data ONTAP avoids RAID impact when a multi-disk carrier must be removed
How to determine when it is safe to remove a multi-disk carrier
Spare requirements for multi-disk carrier disks
Shelf configuration requirements for multi-disk carrier storage shelves
Aggregate requirements for disks in multi-disk carrier storage shelves
Considerations for using disks from a multi-disk carrier storage shelf in an aggregate
Understanding root-data partitioning
How root-data partitioning works
How root-data partitioning affects storage management
Which drives are partitioned and used for the root aggregate
Standard root-data partitioning layouts
Requirements for using root-data partitioning
Initializing a node to configure root-data partitioning
Setting up an active-passive configuration on nodes using root-data partitioning
Adding disks to a node
When you need to update the Disk Qualification Package
Replacing disks that are currently being used in an aggregate
Converting a data disk to a hot spare
Removing disks from a node
Removing a failed disk
Removing a hot spare disk
Removing a data disk
Using disk sanitization to remove data from disks
Stopping disk sanitization
Commands for managing disks
Commands for displaying information about storage shelves
Commands for displaying space usage information
Managing ownership for disks
Types of disk ownership
Reasons to assign ownership of disks and array LUNs
How disks and array LUNs become available for use
How automatic ownership assignment works for disks
Which disk autoassignment policy to use
When automatic ownership assignment is invoked
How disk ownership works for platforms based on Data ONTAP-v technology
Guidelines for assigning ownership for disks
Assigning ownership for disks
Assigning ownership for disks partitioned for root-data partitioning
Removing ownership from a disk
Configuring automatic ownership assignment of disks
How you use the wildcard character with the disk ownership commands
Managing array LUNs using Data ONTAP
Data ONTAP systems that can use array LUNs on storage arrays
Installing the license for using array LUNs
How ownership for disks and array LUNs works
Reasons to assign ownership of disks and array LUNs
How disks and array LUNs become available for use
What it means for Data ONTAP to own an array LUN
Why you might assign array LUN ownership after installation
Examples showing when Data ONTAP can use array LUNs
Assigning ownership of array LUNs
Verifying the back-end configuration
Modifying assignment of spare array LUNs
Array LUN name format
Pre-cluster array LUN name format
Checking the checksum type of spare array LUNs
Changing the checksum type of an array LUN
Prerequisites to reconfiguring an array LUN on the storage array
Changing array LUN size or composition
Removing one array LUN from use by Data ONTAP
Preparing array LUNs before removing a Data ONTAP system from service
Securing data at rest with Storage Encryption
Introduction to Storage Encryption
What Storage Encryption is
Purpose of the external key management server
How Storage Encryption works
Disk operations with SEDs
Benefits of using Storage Encryption
Data protection in case of disk loss or theft
Data protection when returning disks to vendors
Data protection when moving disks to end-of-life
Data protection through emergency data shredding
Limitations of Storage Encryption
Setting up Storage Encryption
Information to collect before configuring Storage Encryption
Using SSL for secure key management communication
Requirements for SSL certificates
Installing SSL certificates on the cluster
Running the key management setup wizard
Running self-encrypting disks in FIPS compliance mode
What FIPS compliance mode means for self-encrypting disks
Considerations for running self-encrypting disks in FIPS compliance mode
Configuring self-encrypting disks to run in FIPS compliance mode
Taking self-encrypting disks out of FIPS compliance mode
Managing Storage Encryption
Adding key management servers
Verifying key management server links
Displaying key management server information
Removing key management servers
What happens when key management servers are not reachable during the boot process
Displaying Storage Encryption disk information
Changing the authentication key
Retrieving authentication keys
Deleting an authentication key
SSL issues due to expired certificates
Removing old SSL certificates before installing new ones
Installing replacement SSL certificates on the cluster
Returning SEDs to unprotected mode
Returning self-encrypting disks to service when authentication keys are no longer available
Destroying data on disks using Storage Encryption
Sanitizing disks using Storage Encryption before return to vendor
Setting the state of disks using Storage Encryption to end-of-life
Emergency shredding of data on disks using Storage Encryption
What function the physical secure ID has for SEDs
SEDs that have PSID functionality
Resetting an SED to factory original settings
How Data ONTAP uses RAID to protect your data and data availability
RAID protection levels for disks
What RAID-DP protection is
What RAID4 protection is
RAID protection for array LUNs
RAID protection for Data ONTAP-v storage
Protection provided by RAID and SyncMirror
Understanding RAID drive types
How RAID groups work
How RAID groups are named
Considerations for sizing RAID groups
Customizing the size of your RAID groups
Considerations for Data ONTAP RAID groups for array LUNs
How Data ONTAP works with hot spare disks
Minimum number of hot spares you should have
What disks can be used as hot spares
What a matching spare is
What an appropriate hot spare is
About degraded mode
How low spare warnings can help you manage your spare drives
How Data ONTAP handles a failed disk with a hot spare
How Data ONTAP handles a failed disk that has no available hot spare
Considerations for changing the timeout RAID option
How RAID-level disk scrubs verify data integrity
Changing the schedule for automatic RAID-level scrubs
How you run a manual RAID-level scrub
Controlling the impact of RAID operations on system performance
Controlling the performance impact of RAID data reconstruction
Controlling the performance impact of RAID-level scrubbing
Controlling the performance impact of plex resynchronization
Controlling the performance impact of mirror verification
What aggregates are
How unmirrored aggregates work
How mirrored aggregates work
What a Flash Pool aggregate is
How Flash Pool aggregates work
Requirements for using Flash Pool aggregates
Considerations for RAID type and spare management for Flash Pool cache
Comparison of Flash Pool aggregates and Flash Cache
How the available Flash Pool cache capacity is calculated
How Flash Pool aggregate caching policies work
Modifying caching policies
How Flash Pool SSD partitioning increases cache allocation flexibility for Flash Pool aggregates
Considerations for when to use SSD storage pools
How you use SSD storage pools
Requirements and best practices for using SSD storage pools
Creating an SSD storage pool
Adding SSDs to an SSD storage pool
Considerations for adding SSDs to an existing storage pool versus creating a new one
Determining the impact to cache size of adding SSDs to an SSD storage pool
Commands for managing SSD storage pools
How the SVM affects which aggregates can be associated with a FlexVol volume
Understanding how Data ONTAP works with heterogeneous storage
How you can use disks with mixed speeds in the same aggregate
How to control disk selection from heterogeneous storage
Rules for mixing HDD types in aggregates
Rules for mixing drive types in Flash Pool aggregates
Rules for mixing storage in array LUN aggregates
How the checksum type is determined for array LUN aggregates
How to determine space usage in an aggregate
How you can determine and control a volume's space usage in the aggregate
How Infinite Volumes use aggregates
Aggregate requirements for Infinite Volumes
How FlexVol volumes and Infinite Volumes share aggregates
How storage classes affect which aggregates can be associated with Infinite Volumes
How aggregates and nodes are associated with Infinite Volumes
How space is allocated inside a new Infinite Volume
Relocating ownership of aggregates used by Infinite Volumes
Managing aggregates
Creating an aggregate using unpartitioned drives
Creating an aggregate using root-data partitioning
Increasing the size of an aggregate that uses unpartitioned drives
Increasing the size of an aggregate that uses root-data partitioning
Correcting misaligned spare partitions
What happens when you add storage to an aggregate
Creating a Flash Pool aggregate using physical SSDs
Creating a Flash Pool aggregate using SSD storage pools
Determining Flash Pool candidacy and optimal cache size
Determining and enabling volume write-caching eligibility for Flash Pool aggregates
Changing the RAID type of RAID groups in a Flash Pool aggregate
Determining drive and RAID group information for an aggregate
Relocating aggregate ownership within an HA pair
How aggregate relocation works
How root-data partitioning affects aggregate relocation
Relocating aggregate ownership
Commands for aggregate relocation
Key parameters of the storage aggregate relocation start command
Veto and destination checks during aggregate relocation
Assigning aggregates to SVMs
Methods to create space in an aggregate
Determining which volumes reside on an aggregate
Determining whether a Flash Pool aggregate is using an SSD storage pool
Commands for managing aggregates
Storage limits
Copyright information
Trademark information
How to send comments about documentation and receive update notifications
