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FortiGate hardware will occasionally goes through different hardware revisions due to different production batches sometimes occurring over many years of a model's production run. This can sometimes induce differences in components ranging from major or minor.
In the case of the the FortiGate 1500D , devices with ~112 GB of hard disk space and an Intel Xeon E5-1650 CPU are considered to have a hardware revision of 'Generation 1', and devices with ~224 GB of hard disk space and an Intel Xeon E5-1650 v2 CPU are referred to as 'Generation 2'.
To identify which hardware revision a specific unit belongs to , refer to the output of the CLI command 'get hardware status'. Below is an example output from a 1500D 'generation 1' with the device having an E5-1650 CPU and approximately 112 GB of hard disk:
FortiGate-1500D # get hardware status
Model name: FortiGate-1500D
ASIC version: CP8
ASIC SRAM: 64M
CPU: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz
Number of CPUs: 12
RAM: 16062 MB
Compact Flash: 30653 MB /dev/sda
Hard disk: 114473 MB /dev/sdb
USB Flash: not available
Network Card chipset: Broadcom 570x Tigon3 Ethernet Adapter (rev.0x5717100)
Network Card chipset: FortiASIC NP6 Adapter (rev.)
A FortiGate-1500D 'generation 2' will show an E5-1650 v2 CPU and approximately 224 GB of hard disk as available:
FortiGate-1500D # get hardware status
Model name: FortiGate-1500D
ASIC version: CP8
ASIC SRAM: 64M
CPU: Intel(R) Xeon(R) CPU E5-1650 v2 @ 3.50GHz
Number of CPUs: 12
RAM: 16063 MB
Compact Flash: 30653 MB /dev/sda
Hard disk: 228936 MB /dev/sdb
USB Flash: not available
Network Card chipset: Broadcom 570x Tigon3 Ethernet Adapter (rev.0x5717100)
Network Card chipset: FortiASIC NP6 Adapter (rev.)
Generally the different hardware revisions are not expected to behave differently, but certain factors like different disk sizes can introduce challenges when trying to form HA clusters, see the article below for more details:
Technical Tip: Forming an HA cluster with models of different hardware revision level
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