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Premium Features

Premium Features. Ryan Leonard Storage and Solutions Architect. Storage Partitions. Creates multiple virtual storage systems Heterogeneous host support Storage-based implementation helps provide data integrity Logical partitioning helps provide flexibility. DS3000 / DS4000 / DS5000.

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Premium Features

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  1. Premium Features Ryan Leonard Storage and Solutions Architect

  2. Storage Partitions • Creates multiple virtual storage systems • Heterogeneous host support • Storage-based implementation helps provide data integrity • Logical partitioning helps provide flexibility DS3000 / DS4000 / DS5000 Host Server

  3. Storage Partitions • Partitioning can be implemented at the host and/or host group level • Number of partitions required dependant on the desired configuration • Partitions licensed in increments – 2, 4, 8, 16, 32, 64, 128, 256, 512 Host Server 3 partitions 1 partition 4 partitions Scenario 1 3 stand-alone servers Scenario 2 3 servers, 1 cluster (i.e. ESX, Windows Cluster, etc.) Scenario 3 3 servers, mixed case

  4. C’ A’ B C A B C Base Volume FlashCopy Volume A C Snapshot Reserve Physical Logical FlashCopy • A point-in-time (PiT) image of a logical drive / LUN • Logical equivalent of a physical copy • Features • Near instantaneous copy • Requires less disk space than a full copy • Can be mapped to any host • Can be read from, or written to • Primary uses • PiT backup image • File / volume restoration • Data mining / analysis

  5. FlashCopy • Advantages • Created nearly instantaneously • Space efficient • Default is 20% size of the original • Disadvantages • Pointers to original data set • Rely on original data being available • Can impact performance

  6. Production Server Analysis Server Volume Copy • Complete (byte-by-byte) PiT replication of one logical drive (source) to another (target) within a storage system • Target logical drive also referred to as a clone • Primary uses • Full PiT data set available for analysis, mining, testing, backup • Helps eliminate I/O contention on the primary logical drive

  7. VolumeCopy • Advantages • Data resides on (potentially) separate set of spindles • Physically distinct clone • Disadvantages • Requires similar disk space to original • 1TB logical drive volumecopy requires another 1TB to copy to • Not created instantaneously • The larger the logical drive, the longer it takes to build clone

  8. SAN / WAN Crossmirroring A1mirror A1 B1mirror B1 Enhanced Remote Mirroring • Storage-based data replication • Ongoing, real-time replication of a logical drive from one DS4000 storage subsystem to another • Three mirroring modes • Metro Mirror • Global Copy • Global Mirror • Primary uses • Disaster recovery • Centralize backup data • Centralize data mining / analysis

  9. Metro Mirror • Synchronous mirroring between DS4000 storage subsystems • Limit of 10 km • Constant synchronization between primary logical drive and secondary logical drive • Writes to both the local primary logical drive and the remote secondary logical drive must complete before I/O completion status is returned to initiating host server

  10. Global Copy • The primary storage subsystem no longer waits for the secondary I/O to complete • Latency issues are eliminated • Unlimited distances • Up to 128 outstanding I/Os per logical drive • Increased performance • Benefit: Flexibility in designing remote mirroring solutions

  11. Global Mirror (Write Consistency) • Ensures that all I/Os to the secondary system are in the same order as it was processed at the primary • Eliminates out-of-order arrivals at the remote site • Logical drives defined in a consistency group participate in write order consistency • Optional mode • Benefit: Provides proper database logical consistency for successful recovery

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