[OpenAFS] Sinvle vice partition VS multi vice partitions

[ProbaNet SRLS]

Hello!
    We're creating a new openafs fileserver (it's a VM), using an iSCSI
target as storage device. Do you think it's better to use a single 1TB
LUN for a single /vicepa or maybe to create 4 LUNs (250 GB each) in the
iSCSI target in order to have /vicepa /vicepb /vicepc and /vicepd? In
both cases, the LUNs will be file "devices". Which are the advantages /
disadvantages in these 2 scenarios?
Thanks for your help!

Stefano
Fabio