Maximum LUN Configuration and Considerations for HP-UX

On the other hand, if a system has 2000 attached LUN devices with 2 paths to each device, all of
which are accessed through a dynamic multi-pathing module, then the number of Active LUN paths
would be 4000. This would be the case by default on HP-UX 11i v3 since native multi-pathing will
load-balance across all available LUN paths.
Supported LUN Maximums on HP-UX
HP-UX supports maximum LUN configurations as defined in Table 1. These maximums are tested
configurations and are subject to change as larger configurations are tested and supported. Contact
your HP support personnel to discuss support of higher LUN levels than those indicated.
Table 1: Maximum Supported LUNs
11i v1
HP-UX Release
Feature
11.00
prior to
December 2003
on or after
December 2003
11i v2 11i v3
Active LUN devices 2400 4096 8192 8192 16384
Active LUN paths 2400 4096 8192 8192 65536
Open/Visible LUN paths 4800 8192 16384 16384 65536
(non-HA) 512 512 1536 1536 4096
Visible LUNs
per HBA
(HA) 320 512 1536 1536 1536
LVM PVs 65280 65280 65280 65280 65280
Maximum LUN size 2TB 2TB 2TB 2TB 8ZB
Visible LUNs per HBA (HA and non-HA) indicates the maximum number of Visible LUN paths
supported through a single HBA port. In this context “HA” (High Availability) refers to usage of the
HBA in an environment in which the MC-ServiceGuard or ServiceGuard-OPS (Oracle Parallel Server)
products are used.
LVM PVs refers to the maximum number of LVM physical volumes (PVs) that can be configured on a
system. A PV corresponds to a LUN device.
Maximum LUN size refers to the maximum usable capacity of a LUN device. This is an
architectural maximum.
Here are some examples using the “HP-UX 11i v1 (prior to December 2003)” column in Table 1:
• 4096 LUN devices, with 2 paths to each device, all controlled by LVM’s PVLinks:
⇒ 4096 Active LUN paths, 8192 Open and Visible LUN paths
• 4100 LUN devices, with 2 paths to each device, and 4090 of them controlled by LVM’s
PVLinks and the other 10 LUNs only used occasionally:
⇒ 4090 Active LUN paths, 8180 Open LUN paths, and 8200 Visible LUN paths
• 2048 LUN devices, with 4 paths to each device, all controlled by LVM’s PVLinks:
⇒ 2048 Active LUN paths, 8192 Open and Visible LUN paths
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