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The least significant six digits of an IBM i disk unit serial number for a FlashSystem 900 LUN come from the volume unique identifier (UID) as assigned by the FlashSystem 900 as shown in Figure 6-8. The first five digits of the serial number following the letter “Y” are a unique hash value built by IBM i, which cannot be used to identify a particular storage system. 

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Unlike with other 512-byte storage systems supported by IBM i that require allocation of 9x 512-byte disk sectors to store a 4 KB IBM i memory page, with the 4096 byte sector support by IBM FlashSystem 900 almost the full storage volume capacity is available for IBM i data. 

