page1
/dev/vg-mars/dev_1
application
/dev/mars/res_1
/mars/resource-res_1/log-*
/mars/resource-res_1/log-*
/dev/vg-mars/dev_1
HOST_1 (primary)
HOST_2 (secondary)
writes (1)
mars writes (2)
mars replay (3)
mars sync (0)
mars replay (5)
mars fetch (4)