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This paper shows how to use DTrace to detect LUN alignment problems on an active system and how to resolve those LUN alignment problems by tuning the EFI disk label. An advanced storage system, such as Oracle's Sun Storage 7000 Unified Storage System, is a traditional SCSI-accessed logical unit (LUN) to client systems. Although these devices may be accessed with legacy 512B I/O transfers, internally these devices may be managed with variable block sizes that are larger than the standard 512B sector size available on commercial hard disk drives.
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