Shulou(Shulou.com)06/03 Report--

Design and optimize vSAN hosts

For optimal performance and availability, plan the host configuration in the vSAN cluster.

Memory and CPU

Adjust the memory and CPU size of the hosts in the vSAN cluster according to the following considerations.

Table 3-2. Adjust the memory and CPU size of the vSAN host

Computing resource considerations memory

1. Memory of each virtual machine

two。 Memory per host based on the expected number of virtual machines

3. A fully functioning vSAN requires at least 32 GB of memory, with 5 disk groups per host and 7 capacity devices that can boot hosts with less than 512 GB of memory from USB, SD, or SATADOM devices. If the memory of the host is greater than 512 GB, set it from SATADOM or disk

Standby boot host. CPU

1. Number of slots per host

two。 Number of cores per slot

3. Number of vCPU based on the expected number of virtual machines

4. Ratio of vCPU to kernel

5. 10% CPU cost of vSAN

Host network

Provide more bandwidth for vSAN traffic to improve performance.

1. If you plan to use a host with an 1-GbE adapter, dedicate the adapter to vSAN. For all-flash configurations, schedule hosts with dedicated or shared 10-GbE adapters.

two。 If you plan to use 10-GbE adapters, these adapters can be shared with other traffic types in hybrid and all-flash configurations.

3. If the 10-GbE adapter is shared with other traffic types, use vSphere Distributed Switch so that vSAN traffic is isolated by using Network I Control O Control and VLAN.

4. Create physical adapter groups for vSAN traffic to ensure redundancy.

Multiple disk groups

If the flash cache or storage controller stops responding, the entire disk group may fail. As a result, vSAN rebuilds all components of the failed disk group from other locations in the cluster.

Using multiple disk groups, each of which provides less capacity, has the following advantages and disadvantages:

Advantages

1. Performance is improved because the data store has more summary caches and the Imap O operation is faster.

two。 The risk of failure is spread across multiple disk groups.

3. If the disk group fails, vSAN rebuilds fewer components, thus improving performance.

Inferior position

1. The cost increases because two or more cache devices are required.

two。 More memory is required to handle more disk groups.

3. Multiple storage controllers are required to reduce the risk of a single point of failure.

Drive carrier

For ease of maintenance, consider using a host with drive bays and PCIe slots in front of the server body.

Device hot plug and interaction

Consider using storage controller pass-through mode support to easily hot-plug or replace disk and flash capacity devices on the host. If the controller is in RAID 0 mode, additional steps must be performed for the host to discover the new drive.

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