Dr. Google didn't help with the request.
Solution is:
See what size is set on target:
# cat /sys/kernel/scst_tgt/handlers/vdisk_nullio/rd1/size
2748779069440
On initiator enormous device size is shown:
# sg_readcap /dev/sg56
READ CAPACITY (10) indicates device capacity too large
...
Hence:
Device size: 2748779069440 bytes, 2621440.0 MiB, 2748.78 GBTo
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