- Notes, cautions, and warnings
- Introduction
- About your MD Series storage array
- Physical disks, virtual disks, and disk groups
- Disk pools
- Thin virtual disks
- RAID levels
- Segment size
- Virtual disk operations
- Disk group operations
- RAID background operations priority
- Virtual disk migration and disk roaming
- Advanced features
- Multi-path software
- Load balancing
- Monitoring system performance
- Interpreting performance monitor data
- Viewing real-time graphical performance monitor data
- Customizing the performance monitor dashboard
- Specifying performance metrics
- Viewing real-time textual performance monitor
- Saving real-time textual performance data
- Starting and stopping background performance monitor
- Viewing information about the current background performance monitor session
- Viewing current background performance monitor data
- Saving the current background performance monitor data
- Viewing saved background performance monitor data
- Invalid objects in Performance Monitor
- Discovering and managing your storage array
- Out-of-band management
- In-band management
- Storage arrays
- Setting up your storage array
- Locating storage arrays
- Naming or renaming storage arrays
- Setting a password
- Adding or editing a comment to an existing storage array
- Removing storage arrays
- Enabling premium features
- Displaying failover alert
- Changing the cache settings on the storage array
- Changing expansion enclosure ID numbers
- Changing the enclosure order
- Configuring alert notifications
- Battery settings
- Setting the storage array RAID controller module clocks
- Using iSCSI
- Changing the iSCSI target authentication
- Entering mutual authentication permissions
- Creating CHAP secrets
- Changing the iSCSI target identification
- Changing iSCSI target discovery settings
- Configuring the iSCSI host ports
- Advanced iSCSI host port settings
- Viewing or ending an iSCSI session
- Viewing iSCSI statistics and setting baseline statistics
- Edit, remove, or rename host topology
- Event monitor
- About your host
- Disk groups, standard virtual disks, and thin virtual disks
- Creating disk groups and virtual disks
- Thin virtual disks
- Advantages of thin virtual disks
- Physical vs virtual capacity an a thin virtual disk
- Thin virtual disk requirements and limitations
- Thin virtual disk attributes
- Thin virtual disk states
- Comparison—Types of virtual disks and copy services
- Rollback on thin virtual disks
- Initializing a thin virtual disk
- Changing a thin virtual disk to a standard virtual disk
- Utilizing unmapping for thin virtual disk
- Enabling unmap thin provisioning for thin virtual disk
- Choosing an appropriate physical disk type
- Physical disk security with self encrypting disk
- Configuring hot spare physical disks
- Physical disk security
- Enclosure loss protection
- Drawer loss protection
- Host-to-virtual disk mapping
- Creating host-to-virtual disk mappings
- Modifying and removing host-to-virtual disk mapping
- Changing RAID controller ownership of the virtual disk
- Removing host-to-virtual disk mapping
- Changing the RAID controller module ownership of a disk group
- Changing the RAID level of a disk group
- Removing a host-to-virtual disk mapping using Linux DMMP
- Restricted mappings
- Storage partitioning
- Disk group and virtual disk expansion
- Disk group migration
- Storage array media scan
- Disk pools and disk pool virtual disks
- Difference between disk groups and disk pools
- Disk pool restrictions
- Creating a disk pool manually
- Automatically managing unconfigured capacity in disk pools
- Locating physical disks in a disk pool
- Renaming a disk pool
- Configuring alert notifications for a disk pool
- Adding unassigned physical disks to a disk pool
- Configuring the preservation capacity of a disk pool
- Changing the modification priority of a disk pool
- Changing the RAID controller module ownership of a disk pool
- Checking data consistency
- Deleting disk pool
- Viewing storage array logical components and associated physical components
- Secure disk pools
- Changing capacity on existing thin virtual disks
- Creating thin virtual disk from disk pool
- Using SSD cache
- How SSD cache works
- Benefits of SSD cache
- Choosing SSD cache parameters
- SSD cache restrictions
- Creating an SSD cache
- Viewing physical components associated with an SSD cache
- Locating physical disks in an SSD cache
- Adding physical disks to an SSD cache
- Removing physical disks from an SSD cache
- Suspending or resuming SSD caching
- Changing I/O type in an SSD cache
- Renaming an SSD cache
- Deleting SSD cache
- Using the performance modeling tool
- Premium feature—Snapshot Virtual Disk
- Snapshot images and groups
- Snapshot Virtual Disk read/write properties
- Snapshot groups and consistency groups
- Understanding snapshot repositories
- Creating snapshot images
- Scheduling snapshot images
- Performing snapshot rollbacks
- Creating snapshot group
- Converting a snapshot Virtual Disk to read-write
- Viewing associated physical components of an individual repository virtual disk
- Creating consistency group
- Creating a snapshot virtual disk of a snapshot image
- Snapshot Virtual Disk limitations
- Creating Snapshot Virtual Disk
- Creating a Snapshot Virtual Disk repository
- Changing the settings of a Snapshot Virtual Disk
- Disabling Snapshot Virtual Disk or consistency group Snapshot Virtual Disk
- Re-creating a Snapshot Virtual Disk or consistency group Snapshot Virtual Disk
- Renaming a Snapshot Virtual Disk or consistency group Snapshot Virtual Disk
- Creating consistency group Snapshot Virtual Disk
- Manually creating a consistency group Snapshot Virtual Disk repository
- Disabling Snapshot Virtual Disk or consistency group Snapshot Virtual Disk
- Re-creating a Snapshot Virtual Disk or consistency group Snapshot Virtual Disk
- Changing the modification priority of an overall repository virtual disk
- Changing the media scan setting of an overall repository virtual disk
- Changing the pre-read consistency check setting of an overall repository virtual disk
- Increasing capacity of overall repository
- Decreasing the capacity of the overall repository
- Performing revive operation
- Premium feature—virtual disk copy
- Types of virtual disk copies
- Creating a virtual disk copy for an MSCS shared disk
- Virtual disk read/write permissions
- Virtual disk copy restrictions
- Creating a virtual disk copy
- Preferred RAID controller module ownership
- Failed RAID controller module
- Copy manager
- Copying the virtual disk
- Storage array performance during virtual disk copy
- Setting copy priority
- Stopping a virtual disk copy
- Recopying a virtual disk
- Removing copy pairs
- Device Mapper multipath for Linux
- Configuring Asymmetric Logical Unit Access
- Premium feature—Remote Replication
- About asynchronous Remote Replication
- Remote replicated pairs and replication repositories
- Types of Remote Replication
- Remote Replication requirements and restrictions
- Setting up Remote Replication
- Activating Remote Replication premium features
- Deactivating Remote Replication
- Remote Replication groups
- Replicated pairs
- Management firmware downloads
- Downloading RAID controller and NVSRAM packages
- Downloading both RAID controller and NVSRAM firmware
- Downloading only NVSRAM firmware
- Downloading physical disk firmware
- Downloading MD3060e Series expansion module EMM firmware
- Self-Monitoring Analysis and Reporting Technology (SMART)
- Media errors and unreadable sectors
- Firmware inventory
- System interfaces
- Storage array software
- Start-up routine
- Device health conditions
- Trace buffers
- Collecting physical disk data
- Event log
- Recovery Guru
- Storage array profile
- Viewing the physical associations
- Recovering from unresponsive storage array condition
- Locating a physical disk
- Locating an expansion enclosure
- Capturing state information
- SMrepassist utility
- Unidentified devices
- Recovering from unidentified storage array
- Starting or restarting the Host Context Agent software
- Getting help
Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide
RAID 0
CAUTION: Do not
attempt to create virtual disk groups exceeding 120 physical disks
in a RAID 0 configuration even if premium feature is activated on
your storage array. Exceeding the 120-physical disk limit may cause
your storage array to be unstable.
RAID 0 uses disk striping
to provide high data throughput, especially for large files in an
environment that requires no data consistency. RAID 0 breaks the data
down into segments and writes each segment to a separate physical
disk. I/O performance is greatly improved by spreading the I/O load
across many physical disks. Although it offers the best performance
of any RAID level, RAID 0 lacks data consistency. Choose this option
only for non-critical data, because failure of one physical disk results
in the loss of all data. Examples of RAID 0 applications include video
editing, image editing, prepress applications, or any application
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