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comp.unix.aix Frequently Asked Questions (Part 3 of 5)
Section - 1.710: What are the theoritical limits within the LVM?

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  -------------------------------------
  LVM Limits within AIX (my perception)
  -------------------------------------
  
  The system may have 1 to 255 Volumes Groups (VG's).
  Each VG may contain 1 to 32 Physical Volumes (PV's).
  Each PV may contain upto 1016 Physical Partitions (PP's).
  Each PP may have a size (square of 2) from 1 to 256MB (1024MB for AIX 4.3).
  
  Therefore, if you can get hold of a 260,096 MB disk (one PV with 1016 
  x 256MB PPs), you can install 32 of these in a single VG giving you 
  8,323,072MB per VG. You may have up to 255 VG's in one AIX system so 
  you could (in theory) create the maximum addressable AIX storage area 
  of 2,122,383,360 MB (2,072,640 GB or 2,024 TB or approx. 2 PB). This 
  is based on the current limitations of AIX V4.1.
  
  The limits for file and filesystem sizes are:

[Editor's note: the original values in this mail appeared to
 be slightly wrong, I have corrected that to the values as per
 my interpretation of the AIX manual.]
  
  AIX V3.2  Max filesystem size:  2,147,483,647 bytes (2 GB)
  Max single file size:  2,147,483,647 bytes (2 GB)
  
  AIX V4.1  Max filesystem size:  1,099,511,627,776 bytes (1 TB)
  Max single file size:  2,147,483,647 bytes (2 GB)
  
  AIX V4.2  Max filesystem size:  1,099,511,627,776 bytes (1 TB)
  Max single file size:  68,589,453,312 (~64 GB)

  AIX V4.3  Max filesystem size:  1,099,511,627,776 bytes (1 TB)
  Max single file size:  68,589,453,312 (~64 GB)

The 1TB maximum file system size is given by the rule that each
fragment must be addressable by an 28 bit number, with the largest
fragment size being 4096 bytes (4096*2^28).

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Top Document: comp.unix.aix Frequently Asked Questions (Part 3 of 5)
Previous Document: 1.709: How do I remove a volume group with no disks?
Next Document: 1.800: How do I control how hostnames are resolved?

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Last Update March 27 2014 @ 02:11 PM