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in script test/nvmf/host/perf.sh github issue #396 has been fixed by removing nested lvol in patch https://review.gerrithub.io/421136, but the testing of nested lvol was removed, we can construct nvmf subsystem only after nested lovl bdev was constructed, it can also fix this issue. Change-Id: I1783aa76c5ce9f076e73827d46de2ef16c0da66e Signed-off-by: xuhuagen <huagenx.xu@intel.com> Reviewed-on: https://review.gerrithub.io/422194 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Hailiang Wang <hailiangx.e.wang@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Karol Latecki <karol.latecki@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>