IBM FlashSystem 5300 vs 5600: Technical Comparison and Key Differences
- Mar 23
- 7 min read
Updated: Mar 30
The IBM FlashSystem 5300 and 5600 are both 1U NVMe all-flash systems built on the same Storage Virtualize platform. The main differences come from hardware generation, performance, connectivity, and scalability.
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IBM FlashSystem 5300 vs 5600
The FlashSystem 5300 is the older 1U NVMe FlashSystem 5x00 platform. IBM announced it in April 2024 as the successor to the 5200.
In practical terms:
FlashSystem 5300 = previous-generation compact 1U NVMe platform.
FlashSystem 5600 = current-generation compact 1U NVMe platform.
Both run IBM Storage Virtualize, but the 5600 is the stronger platform for new deployments.
Technical Summary - IBM FlashSystem 5300 vs 5600
System Architecture - IBM FlashSystem 5300 vs 5600 Specs
Feature | FlashSystem 5300 | FlashSystem 5600 |
Form factor | 1U | 1U |
Front drive bays | 12 NVMe | 12 NVMe |
Drive form factor | U.2 / 2.5-inch | EDSFF |
FlashCore generation | FCM4 | FCM5 |
Node architecture | 2 active-active controllers | 2 active-active controllers |
CPU | Intel Ice Lake D (12-core) | 2 × 12-core Intel Xeon |
PCIe generation | PCIe Gen4 | PCIe Gen4 |
Memory and Capacity - IBM FlashSystem 5300 vs 5600
Feature | FlashSystem 5300 | FlashSystem 5600 |
Memory options | 64 GB / 256 GB / 512 GB | 256 GB / 512 GB |
Max raw capacity | ~461 TB | 633 TB |
Max effective capacity | 1.8 PB | 2.4–2.5 PB |
NVMe SSD capacities | 1.92–30.72 TB | industry NVMe SSD |
FlashCore capacities | 4.8–38.4 TB | 6.6–52.8 TB |
Storage Class Memory | Supported (1.6 TB) | Not published |
Performance - IBM FlashSystem 5300 vs 5600
Metric | FlashSystem 5300 | FlashSystem 5600 |
Max IOPS | 400k | 2.6M |
Max read bandwidth | 28.6 GB/s | 30 GB/s |
Read latency | <50 µs | <50 µs |
Connectivity - IBM FlashSystem 5300 vs 5600
Connectivity | FlashSystem 5300 | FlashSystem 5600 |
Fibre Channel | 32 / 64 Gb FC | 32 / 64 Gb FC |
Ethernet | 10 / 25 Gb | 25 / 100 Gb |
NVMe over FC | Yes | Yes |
NVMe/TCP | Yes | Yes |
SAS expansion | Yes | Yes |
Expansion - IBM FlashSystem 5300 vs 5600
Expansion | FlashSystem 5300 | FlashSystem 5600 |
2U12 SAS | Supported | Supported |
2U24 SAS | Supported | Not listed |
5U92 SAS | Supported | Supported |
SAS chains | Multiple | Two cascaded chains |
Supported HDD sizes | varies by shelf | 12 / 16 / 20 / 24 TB |
Software - IBM FlashSystem 5300 vs 5600
Feature | FlashSystem 5300 | FlashSystem 5600 |
Storage OS | IBM Storage Virtualize | IBM Storage Virtualize |
Baseline version | 8.6.3+ | 9.1.2+ |
Snapshots | Yes | Yes |
Replication | Yes | Yes |
Data reduction pools | Yes | Yes |
Chassis and Internal Architecture - IBM FlashSystem 5300 vs 5600
IBM FlashSystem 5300 (4662-7H2)
19-inch rack mount system
770 mm (30.3 in) chassis depth
example power draw around 662 W in typical configurations, with higher maximum draw depending on installed adapters and drives
The system is designed for field-replaceable node canisters, allowing controller replacement or upgrades without replacing the entire enclosure.
Each enclosure supports:
two adapter slots per node canister
four adapter slots total per enclosure
This layout defines the maximum number of host connectivity adapters that can be installed.
The earlier FlashSystem generation supports:
FlashCore Module 4 (FCM4)
U.2 NVMe SSD media
Storage Class Memory (SCM)
SCM support is one of the architectural differences between the 5300 and the newer 5600 platform.
IBM FlashSystem 5600
The FlashSystem 5600 represents the next-generation hardware design in the 1U FlashSystem class. There are several architectural updates compared with the FlashSystem 5300 platform. The most visible change is the transition to the EDSFF NVMe drive format, replacing the U.2/2.5-inch drive design used in earlier systems.
EDSFF is designed to support:
higher power envelopes for NVMe media
improved cooling and airflow
higher-density flash modules in future generations
The FlashSystem 5600 introduces FCM5 and a newer hardware design, making it a new generation platform rather than a minor update of the 5300.
CPU and Memory - IBM FlashSystem 5300 vs 5600
FlashSystem 5300 memory
5300 memory option | Per node | Per enclosure |
Base | 32 GB | 64 GB |
Standard | 128 GB | 256 GB |
High | 256 GB | 512 GB |
Several Storage Virtualize features require at least 128 GB per node (256 GB per enclosure):
policy-based replication (PB-HA)
data deduplication
embedded VASA provider and vVol replication
Storage Insights integration
This means lower-memory 5300 systems can operate with a reduced feature set. Memory sizing therefore directly affects usable capabilities.
FlashSystem 5600 memory
256 GB
512 GB
The FlashSystem 5600 starts with higher memory configurations, making it better suited for environments with heavy snapshots, replication, high VM density, container platforms, and large data-reduction workloads.
FlashSystem 5300 vs 5600 CPU
Both the IBM FlashSystem 5300 and 5600 are built on dual 12-core Intel Xeon processors, with node canisters that integrate CPU, memory, batteries, and network adapters.
Media and Storage - IBM FlashSystem 5300 vs 5600
FlashSystem 5300 Drive Support
IBM FlashCore Modules (FCM4)
industry-standard NVMe SSDs
Storage Class Memory (SCM)
FlashCore Modules
5300 FCM4 usable capacity | Published effective capacity |
4.8 TB | 21.99 TB |
9.6 TB | 28.8 TB |
19.2 TB | 57.6 TB |
38.4 TB | 115.2 TB |
FlashCore modules include:
PCIe Gen4 interface
hardware compression
self-encryption
T10-DIF support
computational storage features for ransomware detection
FIPS 140-3 validation in progress in the referenced IBM documentation
Industry-standard NVMe SSD Capacities
1.92 TB
3.84 TB
7.68 TB
15.36 TB
30.72 TB
Storage Class Memory
The FlashSystem 5300 also supports 1.6 TB SCM drives. SCM support is an architectural distinction between the 5300 and the 5600.
FlashSystem 5600 drive support
IBM FlashCore Modules
industry-standard NVMe flash drives
FlashCore capacities:
6.6 TB
13.2 TB
26.4 TB
52.8 TB
The FlashSystem 5600 uses FlashCore Module 5 (FCM5), which adds inline anomaly monitoring.
Performance - IBM FlashSystem 5300 vs 5600
FlashSystem 5300
400k IOPS
28.6 GB/s maximum read bandwidth
< 50 µs read latency
1.8 PB effective capacity per enclosure
Capacity figures can be presented differently (for example per controller or per system), which explains why numbers may vary across sources.
FlashSystem 5600
2.6 million IOPS
30 GB/s maximum bandwidth
< 50 µs read latency
633 TB raw capacity
2.4 PB effective capacity per enclosure
Practical interpretation
Bandwidth differences between the two systems are small. The IOPS difference is significant.
The FlashSystem 5600 is therefore better suited to:
high-queue-depth random workloads
dense virtualization environments
multi-tenant workloads with strict latency requirements
metadata-heavy container platforms
The FlashSystem 5300 remains capable but operates within a lower performance envelope.
Host Connectivity and Port - IBM FlashSystem 5300 vs 5600
FlashSystem 5300 Connectivity
Adapter | Protocols | Per node |
Dual-port 64 Gb FC | SCSI, FC-NVMe | 0–2 |
Quad-port 32 Gb FC | SCSI, FC-NVMe | 0–2 |
Quad-port 10 Gb Ethernet | iSCSI, NVMe/TCP, replication | 0–2 |
Dual-port 25 Gb Ethernet (iWARP) | iSCSI, RDMA replication | 0–2 |
Dual-port 12 Gb SAS | SAS expansion | 0–1 |
Each node canister also includes onboard Ethernet ports used for:
management
replication
host access
FlashSystem 5600 Connectivity
Adapter | Protocols | Per node |
Dual-port 64 Gb FC | SCSI, FC-NVMe | 0–2 |
Quad-port 32 Gb FC | SCSI, FC-NVMe | 0–2 |
Quad-port 25 Gb Ethernet | iSCSI, NVMe/TCP | 0–2 |
Dual-port 100 Gb Ethernet | iSCSI, NVMe/TCP, RDMA replication | 0–2 |
Dual-port 12 Gb SAS | SAS expansion | 0–1 |
Onboard Ethernet ports handle management and IP-based storage traffic, with a maximum of 16 I/O ports per enclosure.
Connectivity Differences
The primary difference is Ethernet bandwidth:
5300: up to 25 GbE
5600: adds 100 GbE options
For modern NVMe-TCP deployments, this difference can be significant.
Expansion Shelves and Tiering - IBM FlashSystem 5300 vs 5600
FlashSystem 5300 Expansion Shelves
2U12
2U24
5U92
FlashSystem 5600 Expansion Shelves
2U12
5U92
The system supports:
SAS expansion adapter cards
two independent cascaded expansion chains
maximum chain height of 12U
Supported HDD capacities include:
12 TB
16 TB
20 TB
24 TB
Storage Virtualize - IBM FlashSystem 5300 vs 5600
Both systems run IBM Storage Virtualize, providing the same core software platform:
storage pooling
logical volume virtualization
replication
distributed RAID
snapshots
REST API automation
Ansible and CSI integration
VMware integration
ransomware detection using FlashCore analytics
immutable snapshot capabilities
However, hardware differences affect how far those features can scale.
FlashSystem 5300
hardware compression via FlashCore
thin provisioning
data reduction pools with compression and deduplication
PB-HA policy-based replication model
PB-HA is positioned as the preferred scale-out model rather than traditional multi-I/O-group clustering.
FlashSystem 5600
FlashSystem Grid
workload mobility across systems
scale-out performance and capacity
orchestrated immutable volume groups
safeguarded snapshots
FCM5 also introduces inline anomaly detection capabilities.
Compatibility - IBM FlashSystem 5300 vs 5600
SSIC confirms supported combinations of:
host operating systems
HBAs and NICs
SAN switches
multipathing software
NVMe-FC / NVMe-TCP support
virtualization platforms
replication configurations
external storage virtualization
FlashSystem 5300
Better aligned with environments using:
legacy 10 GbE iSCSI networks
U.2 NVMe media designs
existing FlashSystem 5200 deployments
SCM-based latency tiers
FlashSystem 5600
Better aligned with environments adopting:
EDSFF NVMe media
25/100 GbE Ethernet fabrics
NVMe-TCP architectures
FlashSystem grid scale-out designs
Use cases - IBM FlashSystem 5300 vs 5600
FlashSystem 5300
replacing older compact FlashSystem or Storwize systems
smaller virtualization clusters
branch or remote data centers
deployments requiring SCM
mixed flash and SAS-capacity designs
FlashSystem 5600
primary enterprise storage platforms
dense virtualization environments
NVMe-TCP architectures
high-IOPS workloads
environments standardizing on EDSFF media
FlashSystem grid-based architectures
Buyer Checklist - IBM FlashSystem 5300 vs 5600
Media generation:
5300 uses FCM4 and U.2 NVMe with optional SCM.5600 uses FCM5 and EDSFF NVMe without published SCM support.
Performance headroom:
The difference between 400k and 2.6M IOPS makes the systems suitable for different workload densities.
Network architecture:
FlashSystem 5300 fits traditional FC or 10/25 GbE networks
FlashSystem 5600 supports 100 GbE NVMe-TCP fabrics
Expansion design:
Both support SAS capacity expansion, though shelf options differ slightly.
Memory sizing:
Memory configuration impacts feature availability on the 5300 and affects scalability on both systems.
Lifecycle direction:
IBM’s current FlashSystem portfolio positions the 5600 as the active 1U platform for new deployments.
IBM FlashSystem - Immediate Availability
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FAQ - IBM FlashSystem 5300 vs 5600
Which is better: FlashSystem 5300 or 5600?
FlashSystem 5600 is better for most new deployments due to higher performance and newer architecture. FlashSystem 5300 is still suitable for smaller environments or when SCM support is required.
Does FlashSystem 5600 replace FlashSystem 5300?
FlashSystem 5600 is the newer platform in the same category, but the 5300 is still used in existing environments and specific use cases.
Does FlashSystem 5600 support NVMe over TCP?
Yes. FlashSystem 5600 supports NVMe/TCP and can use 25GbE and 100GbE Ethernet connectivity.
Does FlashSystem 5300 support NVMe over TCP?
Yes. FlashSystem 5300 supports NVMe/TCP, typically over 10GbE and 25GbE networks.
Can FlashSystem 5300 and 5600 use the same drives?
No. They use different drive formats and FlashCore generations, so drives are not interchangeable.
Is FlashSystem 5300 still supported?
Yes. FlashSystem 5300 is still supported and documented, but it is not the newest platform in the lineup.
Sources - IBM FlashSystem 5300 vs 5600
IBM Docs — FlashSystem 5300 system overview:
https://www.ibm.com/docs/en/flashsystem-5x00/8.7.3?topic=5300-system-overview
IBM Docs — FlashSystem 5300 drive support:
https://www.ibm.com/docs/en/flashsystem-5x00/8.7.3?topic=overview-drives
IBM Docs — FlashSystem 5600 system overview:
https://www.ibm.com/docs/en/flashsystem-5x00/9.1.2?topic=5600-system-overview
IBM Docs — FlashSystem 5600 expansion enclosures:
https://www.ibm.com/docs/en/flashsystem-5x00/9.1.2?topic=5600-expansion-enclosures
IBM Product Page — FlashSystem 5600:
https://www.ibm.com/products/flashsystem-5600
IBM Product Resources — FlashSystem specifications and comparisons: