IBM FlashSystem 840 Product Guide
5
Specifications
Table 1 lists the specifications for FlashSystem 840.
Table 1. Specifications (part 1 of 2)
Specification
Description
Model
9840-AE1, 9843-AE1.
Form factor
2U rack-mounted enclosure.
Flash module quantity
Up to 12 flash modules in increments of 2, 4, 6, 8, 10, or 12. These
modules can be either 1 TB, 2 TB, or 4 TB and cannot be intermixed.
Flash type
Enterprise multilevel cell (eMLC).
Raw capacity (TB/TiB)
2.75 TB/2.5 TiB, 5.5 TB/5 TiB, 8.25 TB/7.5 TiB, 11 TB/10 TiB, 16.5
TB/15 TiB, 22 TB/20 TiB, 27.5 TB/25 TiB, 33 TB/30 TiB, 44 TB/40 TiB,
55 TB/50 TiB, 66 TB/60 TiB.
RAID 0 usable capacity
(TB/TiB)
2 TB/1.88 TiB, 4 TB/3.75 TiB, 6 TB/5.63 TiB, 8 TB/7.5 TiB, 10 TB/9.34
TiB, 12 TB/11.25 TiB, 16 TB/15 TiB, 20 TB/ 18.75 TiB, 24 TB/22.25
TiB, 32 TB/30 TiB, 40 TB/37.5 TiB and 48 TB/45 TiB.
RAID 5 usable capacity
(TB/TiB)
2 TB/1.88 TiB, 4 TB/3.75 TiB, 6 TB/5.63 TiB, 8 TB/7.5 TiB, 10 TB/9.34
TiB, 12 TB/11.25 TiB, 16 TB/15 TiB, 20 TB/ 18.75 TiB, 24 TB/22.25
TiB, 32 TB/30 TiB, and 40 TB/37.5 TiB.
Maximum capacity
For RAID 0, the maximum capacity is 48 TB.
For RAID 5, the maximum capacity is 40 TB.
Flash module protection
ECC error correction, Variable stripe RAID data protection,
overprovisioning, and IBM two-dimensional Flash RAID.
RAID support
RAID 0 and RAID 5.
Host interfaces
Two RJ45 Ethernet connections for management and up to 16 host
interface connections, which are either SFP+ FC or QSFP InfiniBand
connections, depending on the selected features.
Maximum bandwidth
8 GBps Read (100%, sequential), 4 GBps Write (100%, sequential).
Read IOPS
1,100,000.
Write IOPS
600,000.
Read latency
135 µs.
Write latency
90 µs.
Maximum volume support
(LUNs)
2 K (2048).
System management
IBM SAN Volume Controller GUI is available in any supported
o
browser.
IBM SAN Volume Controller CLI.
o
SNMP.
o
Email alerts.
o
Syslog redirect.
o
Cooling
Four hot-swappable fan modules.
