I got my answer:
On 64 bit Solaris, a single swap device can be sized upto '2^63 –1' bytes in
size but you can have multiple swap devices.
From man page swap(1M) on Solaris 10
"USAGE
On the 32-bit operating system, only the first 2 Gbytes -1
are used for swap devices greater than or equal to 2 Gbytes
in size. On the 64-bit operating system, a block device
larger than 2 Gbytes can be fully utilized for swap up to
2^63 -1 bytes."
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