Maximum Disk Shelves per Controller Configuration

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When determining how many disk shelves a controller configuration supports, it is important to remember that each disk shelf chain can support up to six disk shelves, and some controller configurations are limited to a specific number of total disk shelves. The following table details the number of supported disk shelf chains per HBA type.

Table 3 Supported Disk Shelf Chains per HBA

HBA Type	Number of Disk Shelf Chains per HBA
SAS-3 4x4 port	2
SAS-2 4x4 port	2
SAS-2 2x4 port	1

As of software release OS8.7.0, 4x4 port SAS-3 HBAs and 4x4 port SAS-2 HBAs can be used together in the same system. Controllers cannot simultaneously use 2x4 port SAS-2 HBAs and 4x4 port SAS-2 HBAs. Sun Disk Shelves are not supported in any system that includes a SAS-3 HBA, or a combination of SAS-3 and SAS-2 HBAs.

The following table shows the maximum number of HBAs per controller, and the maximum number of disk shelves supported per controller configuration. Both standalone and clustered controllers support the same maximum number of disk shelves. For information on disk compatibility, see the Oracle Systems Handbook.

Table 4 Maximum Disk Shelves per Controller Configuration

Controller	Max. Shelves	Max. 2x4 Port SAS-2 HBA	Max. 4x4 Port SAS-2 HBA	Max. 4x4 Port SAS-3 HBA	Guidelines
ZS5-4	48	NA	4	4	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized or read-optimized capability. Total number of chains is eight. Any combination of disk-only and write- or read-optimized shelves may be combined within the chain in any order.
ZS5-2	16	NA	2	2	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized or read-optimized capability. Total number of chains is four. Any combination of disk-only and write- or read-optimized shelves may be combined within the chain in any order.
ZS4-4	36	NA	4	4	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized capability. Total number of chains is eight. Any combination of disk-only and write-optimized shelves can be combined within the chain in any order.
ZS3-4	36	NA	4	NA	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized capability. Total number of chains is eight. Any combination of disk-only and write-optimized shelves can be combined within the chain in any order. You can also connect mixed disk shelf types (DE2 and legacy Sun Disk Shelves) to the same controllers, but each chain must contain only the same disk shelf type. Directly connecting different disk shelf types is not supported.
ZS3-2	16	NA	2	2	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized capability. Total number of chains is four. Any combination of disk-only and write-optimized shelves can be combined within the chain in any order. You can also connect mixed disk shelf types (DE2 and legacy Sun Disk Shelves) to the same controllers, but each chain must contain only the same disk shelf type. Directly connecting different disk shelf types is not supported.
7420	36	6	6	NA	Disk shelves can include 24x HDD, or combine 20x HDD plus 4x SSD. SSDs provide write-optimized capability. Total number of chains is six with 2X4 port SAS-2 HBAs, and 12 with 4X4 port SAS-2 HBAs. Any combination of disk-only and write-optimized shelves can be combined within the chain in any order. You can also connect mixed disk shelf types (DE2 and legacy Sun Disk Shelves) to the same controllers, but each chain must contain only the same disk shelf type. Directly connecting different disk shelf types is not supported.
7320	6	1	1	NA	Any combination of disk-only and write-optimized shelves may be combined within the chain in any order. The cabling configurations are unchanged. You can also connect mixed disk shelf types (DE2 and legacy Sun Disk Shelves) to the same controllers, but each chain must contain only the same disk shelf type. Directly connecting different disk shelf types is not supported.
7120	2	1	NA	NA	Write-optimized SSDs are not supported in the expansion storage for the 7120. The disk shelves must be fully populated with 24 HDDs. You can also connect mixed disk shelf types (DE2 and legacy Sun Disk Shelves) to the same controllers.