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Note 1:

The number of expanded LUs (LDEVs) should not exceed 36, even if the LUSE volume contains

another

LUSE volume.

Note 2:

Combining RAID 1 and R AID 5 volumes into the same LUSE volume is supported, but not

recommended.

Note 3:

If you com bine LD EV00 , LDEV03, and LD EV05 into LUSE 1,LDEV02 and LDEV04 into LUSE 2,

and

LDEV06 and LD EV07 into LUSE3, you can also combine LUSE 1 and LUSE 3. However, you cannot

combine

LUSE 1 and LUSE 2 because the LDEV range in LUSE 1 and LUSE 2 overlaps.

Note 4:

A LUSE volume contains up to 4 MB of disk area to be used for controlling the volume, and

this disk area cannot contain user data. Therefore, the maximum capacity for user data in a LUSE

volume is less than 60 TB.

Table 3 Speciﬁcations and Restrictions on LDEVs Released from a LUSE Volume

No.

Speciﬁcations and Restrictions

TheLUSEvolumemustnot have anydeﬁned path.

Theaccess attributemustbeset to Read/Write.

LUSE Operations Using a Path-deﬁned LD EV

When you crea

te a LUSE volume, the top LUSE volume can b e either an LDEV or a LUSE volume that has

one or more paths deﬁnedtoit. Only thetop volume in theLUSEvolume tobecreated canhaveany

paths. The other volumes in the LUSE volume to be created must not h ave any paths.

Note

:You ca

perform a LUSE operation using a path-deﬁned LD EV regardless of how many paths

are deﬁned t

othe LDEV.

Note

: You cannot combine a path-deﬁned LDEV or LUSE volume with another path-deﬁned LDEV

LUSE volume.

Note

:When y

start the LUSE operation to combine a path-deﬁned LDEV o r LUSE volume with another

path-deﬁned LD EV or LUSE volume, a dialog box will appear with a message asking if you want to

continue the

operation. Click the OK button if you want to continue or the Cancel button if you do not.

Note the following points when you p er form a LUSE operation using a path-deﬁned LDEV:

•

Caution

f a path

is deﬁned from a Windows 2000 host, a Windows Server 2003 host, or an

AIX5.2 host to an LDEV, the LDEV can b e used for LUSE operations using a path-deﬁned LD EV.

However, if a path is deﬁned from a host running a nother operating system to an LDEV, the LDEV

cannot

be used for LUSE operations using a path-deﬁned LDEV.

•

Caution

: If a path is deﬁned from a Windows 2000 host or a Windows Server 2003 host to an

LDEV and y

want to perform a LUSE operation that handles this path-deﬁned LDEV, you must

ensure that the host mode for the Windows host is 2C (Windows Extension). If the host m o de is

not 2C, you must change the host mode to 2C before performing the LUSE operation.

XP24000 LUN Expansion User's Guide

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