[Ocfs2-users] Maximum and minimum OCFS2 volume sizes?

[Villalovos, John L]

joel.becker at oracle.com wrote:
> On Mon, Jul 26, 2004 at 04:53:32PM -0700, Villalovos, John L wrote:
>> Just a quick question.  What is the maximum and minimum volume sizes
>> that OCFS2 supports? 
>> 
>> I'm working on doing a plugin for EVMS to support OCFS2.  One of the
>> functions needs that info.
> 
> 	OCFS2 counts clusters via a u32.  So, you have UINT32_MAX
> clusters as the maximum volume size.  Multiply that by the size of the
> cluster (OCFS2 can be formatted with clustersizes of 4K-1M by
> powers of
> 2).  OCFS2 files have the same size limitation.
> 	As far as the minimum goes, the filesystem needs enough clusters
> to describe itself and set up the system inodes (inodes for internal
> filesystem accounting, the journals, etc).  I'd say that's on
> the order
> of 5000 clusters, but I could be wrong.  I've successfully
> created a 20M
> filesystem with 512B blocksize and 4K clustersize.

Thanks for the info everyone.  I will see what I can figure out :)

John