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When multiple duplicate devices are specified on the command line, the PV is processed once for each of them, but pv->dev is the device used each time. This overrides the PV device to reflect the duplicate device that was specified on the command line. This is done by hacking the lvmcache to replace pv->dev with the device of the duplicate being processed. (It would be preferable to override pv->dev without munging the content of the cache, and without sprinkling special cases throughout the code.) This override only applies when multiple duplicate devices are specified on the command line. When only a single duplicate device of pv->dev is specified, the priority is to display the cached pv->dev, so pv->dev is not overridden by the named duplicate device. In the examples below, loop3 is the cached device referenced by pv->dev, and is given priority for processing. Only after loop3 is processed/displayed, will other duplicate devices loop0/loop1 appear (when requested on the command line.) With two duplicate devices, loop0 and loop3: # pvs Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop0 PV VG Fmt Attr PSize PFree /dev/loop3 loopa lvm2 a-- 12.00m 12.00m # pvs /dev/loop3 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop0 PV VG Fmt Attr PSize PFree /dev/loop3 loopa lvm2 a-- 12.00m 12.00m # pvs /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop0 PV VG Fmt Attr PSize PFree /dev/loop3 loopa lvm2 a-- 12.00m 12.00m # pvs -o+dev_size /dev/loop0 /dev/loop3 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop0 PV VG Fmt Attr PSize PFree DevSize /dev/loop0 loopa lvm2 a-- 12.00m 12.00m 16.00m /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m With three duplicate devices, loop0, loop1, loop3: # pvs -o+dev_size Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop3 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop1 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop3 /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop0 loopa lvm2 a-- 12.00m 12.00m 16.00m /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop3 /dev/loop1 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop1 loopa lvm2 a-- 12.00m 12.00m 32.00m /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop0 /dev/loop1 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop1 loopa lvm2 a-- 12.00m 12.00m 32.00m /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m # pvs -o+dev_size /dev/loop0 /dev/loop1 /dev/loop3 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop1 not /dev/loop0 Found duplicate PV XhLbpVo0hmuwrMQLjfxuAvPFUFZqD4vr: using /dev/loop3 not /dev/loop1 PV VG Fmt Attr PSize PFree DevSize /dev/loop0 loopa lvm2 a-- 12.00m 12.00m 16.00m /dev/loop1 loopa lvm2 a-- 12.00m 12.00m 32.00m /dev/loop3 loopa lvm2 a-- 12.00m 12.00m 32.00m