Cabinet Configuration Guidelines
This section contains guidelines for properly placing and connecting the disk shelves.
Cabinet Configuration
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For safety reasons, mount the heaviest equipment, typically disk shelves, at the bottom of the cabinet. Refer to the appropriate Oracle Safety and Compliance Guide for rack-mounting guidelines.
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To best prepare for cabling controllers to disk shelves, now and in the future, mount controllers in the middle of the cabinet. This also allows for optimal air circulation, whether in a floor- or ceiling-cooled environment.
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Do not remove cabinet panels to run cables between cabinets.
Load Distribution
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Balance the number of disk shelves across the disk chains in your system.
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Balance the number of disk chains across the number of HBAs in your system. For example, attaching two chains to two separate HBAs will have better performance than attaching two chains to a single HBA.
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Do not mix disks with different capacities or rotation speeds within a single disk shelf.
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To maximize performance, use the maximum number of disk chains supported by the controller's SAS HBAs. For example, four SAS HBAs with eight chains and eight disk shelves will have better performance than two SAS HBAs with four chains and eight disk shelves.
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To maximize performance, do not attach more than four Oracle Storage Drive Enclosure DE2-24C, DE2-24P, or DE3-24C disk shelves to a single chain, and do not attach more than three Oracle Storage Drive Enclosure DE3-24P disk shelves to a single chain. This only applies to systems that are performance critical. The maximum of six disk shelves per chain is available for cases where capacity is preferred over performance.
Cable Lengths
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Active optical cables (AOCs) are required for attaching Oracle ZFS Storage ZS9-2 and ZS7-2 controllers to Oracle Storage Drive Enclosure DE3-24 disk shelves. Other controllers and/or disk shelves in the future may use AOC cabling. AOCs are available in the following lengths: 3 meters, 6 meters, and 20 meters. The maximum AOC length between a controller and disk shelves that span further than two adjacent cabinets is 20 meters.
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Oracle Storage Drive Enclosure DE2-24 disk shelves with specific drive types (see Cabling Mixed Oracle Storage Drive Enclosure DE3-24 and DE2-24 Disk Shelves to Oracle ZFS Storage ZS9-2 High-end (HE) Controllers in Oracle ZFS Storage Appliance Cabling Guide, Release OS8.8.x are supported by Oracle ZFS Storage ZS9-2 controllers and require SAS copper cabling connections. Oracle Storage Drive Enclosure DE2-24 disk shelf connection to Oracle ZFS Storage ZS7-2 controllers is supported in software release OS8.8.4 and later. Available copper cable lengths between the Oracle ZFS Storage ZS9-2 controller or the ZS7-2 controller and the Oracle Storage Drive Enclosure DE2-24 disk shelf are 3 meters and 6 meters.
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The maximum copper cable length between a controller and disk shelves is 6 meters.
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The maximum copper or AOC cable length between Oracle Storage Drive Enclosure DE3-24 disk shelves in a single chain that spans two adjacent cabinets is 6 meters copper, 6 meters AOC, or 20 meters AOC; only one pair of 6-meter cables is allowed per chain.
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The maximum copper cable length between Oracle Storage Drive Enclosure DE2-24 disk shelves that span across adjacent cabinets is 3 meters.
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The maximum copper cable length between Sun Disk Shelves that span across adjacent cabinets is 3 meters.
Cable Bend Radius
Do not bend SAS cables less than the following minimum radius:
| SAS Cable Type | SAS Cable Length | Minimum Bend Radius |
|---|---|---|
|
Copper |
1 meter |
26 mm |
|
Copper |
3 meters |
28 mm |
|
Copper |
6 meters |
35 mm |
|
Active Optic Cable |
All lengths |
25 mm |
Supported Disk Shelf Combinations and HBAs
Disk shelves are supported by specific HBAs in the controller, and can be combined in certain configurations within a system. Use the following table to determine the HBA type required by each disk shelf model.
Table 2-1 Required HBA per Disk Shelf Model
| Disk Shelf Model | Required HBA |
|---|---|
|
Oracle Storage Drive Enclosure DE3-24P All-Flash |
SAS-3 4x4 port HBA |
|
Oracle Storage Drive Enclosure DE3-24 Disk Shelf |
SAS-3 4x4 port HBA or SAS-2 4x4 port HBA |
|
Oracle Storage Drive Enclosure DE2-24 Disk Shelf |
SAS-3 4x4 port HBA, SAS-2 4x4 port HBA or SAS-2 2x4 port HBA |
|
Sun Disk Shelf |
SAS-2 4x4 port HBA or SAS-2 2x4 port HBA |
|
Oracle Storage Drive Enclosure DE2-24 and Sun Disk Shelf together |
SAS-2 4x4 port HBA SAS-2 2x4 port HBA for only Sun ZFS Storage 7120 |
The following table describes which disk shelf models can be used together for which controller configurations, starting with software release OS8.7.0. DE2-24 disk shelf connection to ZS7-2 controllers is supported in software release OS8.8.4 and later. See Cabinet and Cabling Guidelines in Oracle ZFS Storage Appliance Cabling Guide, Release OS8.8.x for disk shelf intermixing guidelines and all-flash disk shelf usage. To understand which controllers support which HBA types, see Maximum Disk Shelves per Controller Configuration.
Note:
For optimal performance, do not attach all-flash and non-all-flash disk shelves to the same SAS-3 HBA.Table 2-2 Supported Disk Shelf Combinations per Controller Configuration
| Controller Configuration | DE3-24P All-Flash | All DE3 Disk Shelves (except All-Flash) | All DE2 Disk Shelves | DE3 and DE2 Disk Shelves | DE2 and Sun Disk Shelves |
|---|---|---|---|---|---|
|
Oracle ZFS Storage ZS9-2 with SAS-3 4x4 port HBAs |
Yes |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS7-2 with SAS-3 4x4 port HBAs |
Yes |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS5-4 with SAS-3 4x4 port HBAs |
Yes |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS5-4 with SAS-2 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS5-2 with SAS-3 4x4 port HBAs |
Yes |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS5-2 with SAS-2 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS4-4 with SAS-3 4x4 port HBAs |
Yes |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS4-4 with SAS-2 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS3-4 with SAS-2 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
Yes |
|
Oracle ZFS Storage ZS3-2 with SAS-3 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
No |
|
Oracle ZFS Storage ZS3-2 with SAS-2 4x4 port HBAs |
No |
Yes |
Yes |
Yes |
Yes |
|
Sun ZFS Storage 7420 with SAS-2 4x4 port HBAs |
No |
No |
Yes |
No |
Yes |
|
Sun ZFS Storage 7420 with SAS-2 2x4 port HBAs |
No |
No |
Yes |
No |
No |
|
Sun ZFS Storage 7320 with SAS-2 4x4 port HBAs |
No |
No |
Yes |
No |
Yes |
|
Sun ZFS Storage 7320 with SAS-2 2x4 port HBAs |
No |
No |
Yes |
No |
No |
|
Sun ZFS Storage 7120 with SAS-2 2x4 port HBAs |
No |
No |
Yes |
No |
Yes |