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Oracle® ZFS Storage Appliance Customer Service Manual
For ZS3-x, 7x20 Controllers, and DE2-24, Sun Disk Shelves
The COMSTAR framework relies on a ZFS pool upgrade for complete support of persistent group reservations (PGRs). Before this upgrade has been applied, the number of reservations stored with each LUN is severely limited, and may even be zero.
Applying this update is equivalent to upgrading the on-disk ZFS pool to version 16.