IBM FlashSystem 840 Product Guide
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Key features
FlashSystem 840 provides extreme performance, enterprise-class reliability, energy efficiency, and
optional data-at-rest encryption.
Scalability and performance
FlashSystem 840 has the following scalability and performance features:
IBM MicroLatency provides latency that is measured in microseconds
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High aggregate performance (bandwidth) and IOPS (I/Os per second)
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Two hot-swappable canisters, providing connectivity to the host
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Flexible interface types of Fibre Channel, Fibre Channel over Ethernet (FCoE), iSCSI and InfiniBand
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Up to 16 ports of 8 Gbps or eight ports of 16 Gbps Fibre Channel
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Up to 16 ports of 10 Gbps FCoE
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Up to 16 ports of 10 Gbps iSCSI
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Up to eight ports of 40 Gbps quad data rate (QDR) InfiniBand
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Slots for up to 12 hot-swappable flash storage modules (1 TB, 2 TB or 4 TB modules)
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Configurable 2 - 48 TB of capacity for increased flexibility
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Reliability, availability, and serviceability
FlashSystem 840 storage products deliver the following enterprise-class reliability features:
Concurrent code load enables customer applications to remain online during firmware upgrades to all
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components, including the flash modules.
Hot-swappable flash modules by way of tool-less front panel access. If a flash module failure occurs,
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critical customer applications can remain online while the defective module is replaced.
Redundant hot-swappable components. RAID controllers, management modules, interface cards (all
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contained in the canister), batteries, fans, and power supplies are all redundant and hot-swappable.
All components are easily accessible through the front or rear of the enclosure, so IBM FlashSystem
840 does not need to be moved in the rack and no top access panels or cables need to be extended.
RAID 0 and RAID 5 configurations for reliability that suits varying client needs.
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System-wide RAID 5 with easily accessed front-loadable hot-swappable flash modules to help
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prevent data loss and improve availability.
IBM Variable Stripe RAID™ (VSR), which is a patented IBM technology that provides an intra-module
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RAID stripe on each flash module.
Two-dimensional (2D) Flash RAID, which consists of IBM Variable Stripe RAID and system-wide
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RAID 5. Variable Stripe RAID technology helps reduce downtime and maintain performance and
capacity in the event of partial or full flash chip failures. System-wide RAID 5, with easily accessed hot
swappable flash modules, helps prevent data loss and promote availability.
Flash Cell leveling, which is a technology that reduces flash cell wear because of electrical
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programming.
Energy and space efficiency
FlashSystem 840 has the following features:
Nominal 625 W power consumption (for a 70/30 read/write workload on an eight module, 2 TB
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FlashSystem), and uses two standard, single-phase (100 v - 240 v) electrical outlets.
Space-efficient 2U form factor that is ideally suited for today's data centers.
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