Stan Sieler ([log in to unmask]) wrote:
: CCooksey ([log in to unmask]) wrote:
: : Being unfamilar with MPE, does it have the same restrictions as HPUX in
: : regard to 4GB maximum filesystem size?
 
: No...you can have many, many, many GBs of data in a file system (which
: we call a "volume set").  I don't remember the limit, but I suspect
: it is somewhere around 255 * 8 GB (I seem to recall that a volume set is
: limited to 255 disk drives, and the biggest drive I've seen is about 8 GB).
 
You're correct, a volume set is limited to 255 disk drives.  However,
MPE supports 255 mounted disk drives.  Currently, there is a MVT (Mounted
Volume Table) limit.
 
: (And, there can be a large number of volume sets, but I don't remember
: the limit.)
 
The max number of mounted volume sets is 255 also.
 
: : Does it have LVM to get around this restriction?
 
: Well, we don't have the restriction, so we don't need to get around it.
 
: The "volume set" definition is similar to Unix' LVM in that a volume
: set can span multiple disk drives... but there is one important
: major difference: on MPE, a volume set consists of entire disk drives...
: you can't have a drive that is part of two different volume sets (unlike,
: say, HP-UX where you can have multiple file systems on the same drive).
 
: Stan Sieler
: [log in to unmask]
 
From day one, MPE supported files spanning multiple disk drives.  I think
it is ironic that only recently UNIX supports this feature.  UNIX people
think it is something that they invented.
 
There is a utility called VOLUTIL that lets you create and manage
volume sets, volumes and volume classes.  Please refer to the
documentation.
 
Rick Ehrhart
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