Справочник Пользователя для Q-Logic 8200 SERIES

4 – Using the SANbox SSP

Configuring Storage

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The default maximum frame size for the SANbox SSP is 1024 bytes. The maximum 
frame size must be set to the smallest maximum frame size of any device on the 
SAN.

If no device on the SAN is less than 2048 bytes, set the maximum frame size to 
2048 bytes for a potential performance advantage. See 

 for more information about setting the maximum frame size. 

The maximum frame size for most SANs can be set to 2048.

 

CAUTION! Failure to comply with this restriction can cause the SVM to be unable 

to see or access the available storage, or, in the most extreme cases, 
data corruption. 

This StoreAge-specific restriction affects RAID devices that are used as back-side 
storage. 

Some RAID devices allow the administrator to expose multiple logical units on 
multiple ports of the RAID device using the same logical unit number (LUN). This 
means that a logical unit can be exposed on controller A port 1 as LUN 3, for 
example, while simultaneously a different logical unit can be exposed on controller  B 
port 2, also as LUN 3.

While this is a legal configuration for the RAID devices in question, the device 
manager in the SVM GUI (Storage Virtualization Manager Graphical User Interface) 
interprets those two distinct LUNs as a single piece of physical storage, with two 
available paths.

When accessing storage through SVM GUI, it is important that the administrator 
not assign the same LUN ID to different logical units on the same RAID device, 
even if those logical units are visible on different ports. Each logical unit on a given 
RAID device must have a unique LUN ID.