Huawei storage memory, quorum servers and support modules (37 P/Ns)

This is the group nobody looks at until something stops

37 part numbers, and they have almost nothing in common: controller memory, quorum servers, service processors, internal PCIe switches, a switch, a modem. What they share is that they are all supporting infrastructure — none of them carries user data, and all of them can stop a system working.

Controller memory is matched, not upgraded

7 rows are memory modules. In a storage controller these are not user-upgradable in the way server memory is: the controller model was qualified with a specific capacity per slot and a specific population, and the cache size in the datasheet follows from that. The capacities present here are 16 GB 2, 32 GB 3, 64 GB 2.

• Match the controller model, not the slot count. Two controllers with the same slot count can specify different module capacities.
• Rank and organisation matter: the description states the rank and the device width.
• A larger module does not always give more cache — the controller may not address it.
• Mixed population across a controller pair is a supported-state question. Ask before you mix.

DDR4 versus DDR5 is visible in the description

The descriptions here name the generation and the transfer rate — for example DDR4 RDIMM at 2933 MT/s or 3200 MT/s, and later parts at 5600 MT/s. The rate and the voltage are the two figures that tell you which controller generation the module belongs to. The rank split in this list is 1R 3, 2R 4.

• Higher transfer rate does not mean compatible: the controller memory bus sets the ceiling.
• RDIMM means registered, with a buffer between the DRAM and the bus. Unbuffered modules are not substitutes.
• ECC is present on every module here; it is a controller requirement, not an option.

The quorum server is the smallest part that stops the cluster

9 rows are quorum servers. In a two-site stretched cluster the quorum server is the third vote: without it the two sites cannot decide which one should keep serving, and the cluster stops. It is a 1U box with modest specification and it is the part most often left out of a disaster-recovery spare list, because it does not look like storage.

• A quorum server is not a general-purpose server; the software image is part of the product.
• Some deployments use a quorum disk instead. Confirm which your design uses before ordering.
• Keep the quorum server on a site that is independent of both data sites.

Service processors and internal switches

8 rows are service processors and 3 are PCIe switches. A service processor is the management appliance for a storage system: it runs the management software, presents the web interface and collects logs. If it fails the data path keeps running and you lose management, alerting and support access. The PCIe switch is internal fabric between the controller and NVMe bays; it is invisible until it is not.

• Service processors ship with an operating system image; the image version matters for management compatibility.
• Some service processor variants differ only in power input (AC or 48 V DC).
• A PCIe switch failure usually presents as missing NVMe bays, not as a controller fault.

Full part-number list, 37 P/Ns

Descriptions are the official catalogue text, including capacity, rank, transfer rate and voltage for memory modules where Huawei publishes them.

Before you order from this group

• For memory, match the controller model and the qualified capacity per slot.
• For a quorum server, confirm whether your design uses a server or a disk.
• For a service processor, confirm the management software version compatibility.
• For a PCIe switch, confirm the enclosure generation — it is not a generic part.
• Send us the system model; this group has the widest spread of matching rules on the site.

Frequently asked questions

Can I increase controller cache by fitting larger memory modules?

Not reliably. The controller is qualified with a specific capacity per slot; a larger module may not be addressed.

Is server memory a substitute for controller memory?

No. Registered ECC modules with the specified rank and organisation are required, and the controller memory bus sets the rate ceiling.

What happens if the quorum server fails?

In a stretched cluster the two sites lose their tie-breaker and the cluster stops serving. It is a small part with a large consequence.

Does a failed service processor stop I/O?

Usually not. You lose management, alerting and support access, and the data path keeps running.

Why do some service processors differ only in power input?

Because the same appliance is offered for AC cabinets and for 48 V DC sites. The part number differs; the function does not.