6.2.4 HP StoreAll Storage Release Notes (AW549-96071, April 2013)

NOTE: The 12th column (“FFREE”) is your total available inode count per segment for the original
segments 66 Million per segment and that of the newer 64 bit segments of 1 billion per segment. This
segment mix and inode count does not negatively affect the operation of your file system nor any
applications.
Software snapshots
Upgrading pre-6.0 file systems for snapshots
To accommodate software snapshots, the inode format was changed in the 6.0 release. Consequently,
files used for snapshots must either be created on StoreAll OS software 6.0 or later, or the pre-6.0 file
system containing the files must be upgraded for snapshots. To upgrade a file system, use the
upgrade60 utility. For more information about the utility, see “upgrade60” in the HP StoreAll Storage
CLI Reference Guide.
IMPORTANT: This tool requires exclusive access to the file system and implies down time, as the file
system must be unmounted before the upgrade.
Restrictions for rename options
For file systems that were created in a release earlier than 6.0 but have not been upgraded, StoreAll
OS software can preserve all name space data in snapshots but cannot preserve file data for objects
(files). To help prevent “hybrid snap trees,” in which a snap tree contains objects with the old format,
restrictions have been implemented on rename operations. The following restrictions apply to hybrid
file systems:
• Only directories created in version 6.0 or later can become snap tree roots.
• If the old directory is not in a snap tree and the new directory is in a snap tree, rename is allowed
only if the object being renamed is snapable (that is, it has the new inode format).
The following restrictions apply to both hybrid file systems and pure 6.x file systems:
• A snap tree root cannot be renamed. Also, the path to a snap tree root cannot be changed.
• Rename is allowed when neither the old directory or the new directory are in snap trees.
• Rename is allowed when the old directory and the new directory are in the same snap tree.
Rename is not allowed when the directories are in different snap trees.
These restrictions are intended to prevent hybrid snap trees containing files with the old format. However,
hybrid snap trees can still occur when a directory having the new format is populated, using rename,
with old format objects and that directory is then made into a snap tree root or is renamed into a snap
tree. The StoreAll OS software does not prevent this situation because it could take a prohibitively
long amount of time to perform a complete scan for old objects in the sub tree being moved if the new
sub tree was sufficiently large.
Enhancements in the 6.2.4 release 7