Set up FlashArray NVMe-oF RDMA

This document explains setup and configuration steps for using Portworx version 2.13.0 or newer on FlashArray NVMe-oF RDMA (RDMA over Converged Ethernet). Using this feature, you can attach FlashArray volumes using the NVMe-oF RDMA protocol. Follow the steps in this document when you set up and install Portworx.

NVMe-oF RDMA can be used with FlashArray Cloud Drives (FACD) or FlashArray Direct Access (FADA) volumes. When you select NVME-oF RDMA during StorageCluster spec generation or specify the protocol in the spec manually, Portworx recognizes that you want to use the NVMe-oF RDMA protocol and uses it to communicate with the FlashArray.

note

• QoS (IOPS and bandwidth) limits are not supported with NVMe volumes.
• In-place upgrades from iSCSI or Fibre Channel to NVMe are not supported. Changing the SAN type might result in unpredictable attachment behavior.

Prerequisites

• Check that your setup meets the requirements in the NVMe-oF RDMA Support Matrix.
• Make sure that your Linux kernel supports NVMe. You need to load the nvme-fabrics and nvme-rdma modules on boot or include them when you compile the kernel.
• Install the nvme-cli package.
• Ensure that all nodes have unique NQN (/etc/nvme/hostnqn) and host ID (/etc/nvme/hostid) entries.

Configure hardware

Configure your Cisco, Juniper, or Arista switch for use with Pure FlashArray NVMe-oF RDMA.

Configure software

To configure your software settings, follow the steps in Linux Recommended Settings, with the following change.

When you set up your multipath.conf file, add a blacklist section as shown in the following example:

blacklist {
        devnode "^pxd[0-9]*"
        devnode "^pxd*"
        device {
          vendor "VMware"
          product "Virtual disk"
        }
}

defaults {
        polling_interval       10
        find_multipaths        on
}

devices {
    device {
        vendor                      "NVME"
        product                     "Pure Storage FlashArray"
        path_selector               "queue-length 0"
        path_grouping_policy        group_by_prio
        prio                        ana
        failback                    immediate
        fast_io_fail_tmo            10
        user_friendly_names         no
        no_path_retry               0
        features                    0
        dev_loss_tmo                60
    }
    device {
        vendor                   "PURE"
        product                  "FlashArray"
        path_selector            "service-time 0"
        hardware_handler         "1 alua"
        path_grouping_policy     group_by_prio
        prio                     alua
        failback                 immediate
        path_checker             tur
        fast_io_fail_tmo         10
        user_friendly_names      no
        no_path_retry            0
        features                 0
        dev_loss_tmo             600
    }
}

Install Portworx

Perform the steps in one of the following documents to install Portworx version 2.13.0 or newer on your FlashArray setup, then return to this document.

• Provision Cloud Drives on Pure Storage FlashArray
• Configure Pure Storage FlashArray as a Direct Access volume

Configure the adapter as a PCI device

Configure the NVMe-oF RDMA adapter installed in ESXi as a PCI device. For example, on vSphere, follow the steps in Enable Passthrough for a Network Device on a host from the VMware documentation.

Once the NVMe-oF RDMA adapter is set up as a PCI device, the VM can mount as a PCI device and access external storage directly.

Use NVMe-oF RDMA in a VM

If you are using a VM, you also need to perform additional steps to enable and configure PCI passthrough.

The following examples illustrate how to perform these steps for vSphere. Your environment might require different steps.

Enable RoCE as PCI passthrough

After you install a physical adapter, the NVMe-oF RDMA adapter should be listed in PCI Devices.

1. Navigate to a host in the vSphere Client navigator.

2. Select the Configure tab, then under Hardware, select PCI devices.

3. Select all of the NVMe adapters that you have added, then select Toggle passthrough.

   When passthrough configurations complete successfully, the device is listed in the Passthrough-enabled devices tab.

Configure PCI passthrough in a VM

1. In the vSphere client, select the VM you want to add the PCI passthrough card to from the list of VMs. Right click the VM, then select Edit settings.

2. Click Add new device, then select PCI device.

3. Select DirectPathIO, then select any of the RoCE adapter interfaces.

   Add as many PCI devices for RoCE adapters as you need for the VM. Multiple ports on the FlashArray will provide redundant connections, but for extra redundancy you should add two or more PCI devices in case one device fails.

Further considerations

Before upgrading NVMe software, Portworx by Pure Storage recommends putting Portworx in maintenance mode.