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User Guide
1.9 Limitations & Restrictions
The following are limitations and restrictions when using the OpenFlex Data24 3200 :
1. Drive related:
a. Maximum of 24 drives and 32 namespaces per drive, in the OpenFlex Data24 3200 with one AIC
per IO Module.
b. Maximum of twelve drives per AIC and 32 namespaces per drive, in the OpenFlex Data24 3200
containing two AIC per IO Module.
c. Maximum of eight drives per AIC and 32 namespaces per drive, in the OpenFlex Data24 3200
containing three AIC per IO Module.
d. Creating namespaces on the drive outside of the enclosure, and then inserting it into the enclosure
is not supported.
e. For drive firmware updates, update only four drives per AIC at a time using NVMe-CLI. Drive
updates may be in parallel through different AICs and may take up to five minutes to complete.
f. Namespaces from the same drive, should have the same blocksize (either 4096 or 512B).
2. NVMe/NVMe-oF related:
a. Maximum of 448 for RoCE and TCP I/O connections per AIC.
b. Maximum of 16 I/O Queue Depth per IO Queue Pair.
c. The following NVMe Admin commands are not supported:
• Asymmetric Namespace Access (ANA).
• Reservations.
• Non-Transparent Bridge (NTB).
• NVMe-MI Send/Receive.
• Directive Send/Receive.
• Virtualization Management.
• Doorbell Buffer Config.
• Fused (Compare and Write).
• Zoned Namespaces (ZNS).
d. Not all nvme-cli wdc plug-in commands are supported. The following are supported if needed for
support:
• cap-diag (may take up to 50 minutes to complete).
• vs-internal-log (specify transfer size of 0x1000).
• vs-smart-add-log (-CA Log Page).
• clear-pcie-correctable-errors.
• get-drive-status
e. When using multiple NICs on a single host with IPs on the same subnet, two ARP settings need to
be changed from the Linux® default on the host:
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.all.arp_ignore=1
This will prevent the host from responding to the wrong MAC address when there are multiple
target ports on the same subnet.
1. Overview
1.9 Limitations & Restrictions
18
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