HP XP Racks - Manual (Page 356)

Select Pool VOLs window
Use this window to add pool-VOLs to a pool. Up to 1024 volumes can be added including the
volumes already in the pool. Only the LDEVs assigned to the logged-on user are available.
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Up to three different drive types of pool-VOLs can be registered in the same pool.
356 Thin Provisioning and Smart Tiers GUI reference