Hi all, one of my lv has become completely unaccessible. Every read access results in a buffer io error: Buffer I/O error on dev dm-13, logical block 0, async page read this goes for every block in the lv. A ddrescue failed on every single block. $ lvdisplay --- Logical volume --- LV Path /dev/vg0/lv-vm-tviewer LV Name lv-vm-tviewer VG Name vg0 LV UUID XdgHFs-RHVZ-9BAH-1ZSK-yiBX-qqf0-273CtT LV Write Access read/write LV Creation host, time host1, 2016-02-06 14:58:19 +0100 LV snapshot status INACTIVE destination for lv-vm-tviewer_vorigin LV Status available # open 0 LV Size 58.59 GiB Current LE 15000 COW-table size 5.86 GiB COW-table LE 1500 Snapshot chunk size 4.00 KiB Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:13 Other lv on the same volume group are healthy. In fact the whole host runs on the same vg and does not show any problems. Physical volume is a md raid1 device which is also healthy, as well as its hard disks. The faulty lv is used as the storage device for a qemu vm, which suddenly stalled when the io-errors appeared on the host. Is the any way to diagnose this problem? (centos 7) Regards .....Volker