This is a 7.5 system, fully patched with 325 LUN's (disk drives).

The system crashed when it ran out of B-Tree Extents.

I have included some documentation I have found.   There are two Extent B-Tree system tables.

54 Extent B-Tree
56 Extent B-Tree AR

I am concerned about the first one.

In the documentation they appear to be the same thing.

I made a false assuption that it had do with number of file extents, that does not appear to be the case.

Can someone explain to me what B-Tree Extents are and how I can minimize them?
 
Regards,

-Craig


FILE EXTENTS 
    This resource is also referred to as the Extent B-Tree Table. Disk files and virtual memory disk areas are  allocated in contiguous pieces called "extents". Each node in the  Extent B-Tree can describe up to four extents. If an object  contains more than four extents, it will use additional notes as needed. Every non-resident object with fixed access rights will 
 require one or more nodes in this table when it is mapped in (opened). 
    NOTE: Objects with fixed access rights are those for which all pages have identical read and/or write access as well as the same privilege level. Extent information about objects with variable access rights is kept in the Extent AR B-Tree Table. 
 
 ACCESS RIGHTS 
   This resource is also referred to as the Extent B-Tree AR Table.  Disk files and virtual memory disk areas are allocated in contiguous pieces called "extents". Each node in the Extent AR B-Tree can describe up to eight extents. If an object contains more than eight extents, it will use additional nodes as needed. Every non-resident object with variable access rights will obtain one or more nodes in this table when it is mapped in (opened). NOTE: Objects with variable access rights are those for which not all pages have identical read and/or write access or the same  privilege level. NM program files and NM library files are examples of objects with variable access rights. Page 0 has write access in addition to the read/execute access that is given to the other pages of the file. Extent information about objects with fixed access rights is kept in the Extent B-TreeTable. 



		
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