Planning the Expansion
The planning involves selecting proper disk enclosures and determining the number of disk enclosures and disk bays you want to add based on compatibility rules and the live network information, such as the disk bay model, disk enclosure model, disk type, and disk specifications.
Specifying the Type of the Disk Bays to Be Added
After determining the disk bays to be added, record the types and specifications of relevant devices in a list to facilitate the check before hardware installation, preventing a capacity expansion failure due to incompatible types or specifications.
Comply with the following rules when selecting a disk bay:
- The disk bay to be added must be supported by the storage system.
- The types of the new disk enclosures must be supported by the controller enclosures.
- The total number of disk enclosures in the storage system must not exceed the system specifications.
- The number of disk enclosures in each loop must not exceed the system specifications.
- The RAID policy is set to RAID 6 when the capacity tier consists of NL-SAS disks.
- Disk enclosures cascaded in the same loop must be of the same type. For example, a 2 U SAS disk enclosure and a 4 U SAS disk enclosure cannot be cascaded in the same loop.
- SAS disk enclosures use mini SAS HD cables to connect to the controller enclosures.
- Smart disk enclosures use 100G QSFP28 cables to connect to the controller enclosures.
- For the disk enclosure types and specifications supported by the storage system, refer to the Specifications Query Assistant (https://support-it.huawei.com/spec/#/home).
- For 2 U controller enclosures, one controller enclosure cannot connect both SAS disk enclosure and smart SAS disk enclosure.
- For 4 U controller enclosures
- If the storage system has only SAS disk enclosures, you can add only SAS disk enclosures.
- If the storage system has only smart disk enclosures, you can add only smart disk enclosures.
- If the storage system has SAS disk enclosures and smart disk enclosures, you can add SAS disk enclosures or smart disk enclosures that do not exceed the system specifications.
- If the storage system has idle expansion ports, you are advised to use idle ports to create a loop for capacity expansion.
Determining the Number of the Disk Bays to Be Added
The formula for calculating the number of the disk enclosures to be added is as follows: Number of the disk enclosures to be added = Number of disks to be added/Maximum number of disks that can be carried by a disk enclosure.
If the result includes decimals, round them up.
Table 9-1 lists the maximum number of disks supported by a disk enclosure.
Disk Enclosure |
Maximum Number of Disks |
|---|---|
2 U SAS disk enclosure |
25 |
4 U SAS disk enclosure |
24 |
4 U high-density disk enclosure (applicable to V500R007C70SPC100 and later versions) |
75 |
2 U smart SAS disk enclosure (with 2.5-inch disks) |
25 |
2 U smart SAS disk enclosure (with 3.5-inch disks) |
12 |
2 U smart NVMe disk enclosure |
36 |
You can use the following equation to determine the number of the disk bays to be added: Number of disk bays to be added = Number of disk enclosures to be added/Maximum number of disk enclosures supported by one disk bay.
- A maximum of sixteen 2 U SAS and eight 4 U SAS disk enclosures or smart disk enclosures are supported.
- If the result includes decimals, round them up.
Determining the Installation Positions of the Disk Enclosures in a Bay
If you use a third-party bay or cabinet upon delivery, strictly follow the device layout chart to install disk enclosures to ensure that they are placed in the same positions as displayed on DeviceManager. For details about the layout rules, see Mapping Between Disk Enclosure Locations and Expansion Ports (OceanStor 18000 V5 and 18000F V5 Series).
