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Operating system/driver capabilities and limitations

225

Troubleshooting

Operating system/driver capabilities and limitations

The following capabilities and limitations should be noted for

Windows operating systems with Emulex adapters.

LUNs

Theoretically, Windows supports up to 261,120 total LUNs. This

figure is based on the listed support limitations for Windows Server

from Microsoft: 8 buses per adapter, 128 targets per bus, and 255

LUNs per target. However, due to registry hive limitations, a

Windows server is most likely to run out of registry space to keep

track of these large LUN counts well before reaching this limit.

Windows 2000 has this registry size issue. See Microsoft

knowledge-base articles 292726 and 269075 for information.

Windows 2003 does not have this issue.

Microsoft Windows limits the number of LUNs per adapter to 255

(LUNs 00-FE) even though the adapters are capable of presenting 256

(LUNs 00-FF). It is a function of the operating system that prevents

that last LUN from being presented to the user, and not the adapter or

driver. This limitation should be taken into consideration when

planning your host configuration.

Based on E-Lab testing, it has been determined that for EMC

configurations, Windows servers should be limited to a maximum of

500 LUNs. In most cases, this number will be more than sufficient. In

others, it may be deemed too small. For configurations where a large

amount of storage is necessary, but not necessarily a large number of

disks, EMC storage can be configured to present LUNs of large sizes

to the host.

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Emulex 110 Guía de instalación Pagina 225