$ rbd map xxx rbd: sysfs write failed 2023-04-21 11:29:13.786418 7fca1bfff700 -1 librbd::image::OpenRequest: failed to retrieve image id: (5) Input/output error 2023-04-21 11:29:13.786456 7fca1b7fe700 -1 librbd::ImageState: 0x55a60108a040 failed to open image: (5) Input/output error rbd: error opening image xxx: (5) Input/output error In some cases useful info is found in syslog - try "dmesg | tail" or so. rbd: map failed: (5) Input/output error the command 'dmesg | tail' did not show any useful results. and other command: $ rbd info xxx 2023-04-21 11:33:10.223701 7f3547fff700 -1 librbd::image::OpenRequest: failed to retrieve image id: (5) Input/output error 2023-04-21 11:33:10.223739 7f35477fe700 -1 librbd::ImageState: 0x5647d5cfeeb0 failed to open image: (5) Input/output error rbd: error opening image xxx: (5) Input/output error i know header id is c2c061579478fe ,so i get omapvals: $ rados -p rbd listomapvals rbd_header.c2c061579478fe features value (8 bytes) : 00000000 01 00 00 00 00 00 00 00 |........| 00000008 object_prefix value (27 bytes) : 00000000 17 00 00 00 72 62 64 5f 64 61 74 61 2e 63 32 63 |....rbd_data.c2c| 00000010 30 36 31 35 37 39 34 37 38 66 65 |061579478fe| 0000001b order value (1 bytes) : 00000000 16 |.| 00000001 size value (8 bytes) : 00000000 00 00 00 00 71 02 00 00 |....q...| 00000008 snap_seq value (8 bytes) : 00000000 00 00 00 00 00 00 00 00 |........| 00000008 I scanned all existing data blocks using the command 'rados -p rbd list | grep c2c061579478fe', and found many 'rbd_data' blocks. I suspect that the loss of important blocks caused this situation. Currently, my plan is to obtain all 'rbd' blocks, concatenate them into an XFS file, and then perform a repair. However, as the data size is huge, I am still experimenting with this method. Are there any other feasible methods to repair this data? rbd_data: rbd_data.c2c061579478fe.0000000000000000 rbd_data.c2c061579478fe.0000000000000001 rbd_data.c2c061579478fe.0000000000000002 rbd_data.c2c061579478fe.0000000000000003 rbd_data.c2c061579478fe.0000000000000004 rbd_data.c2c061579478fe.0000000000000005 rbd_data.c2c061579478fe.0000000000000006 rbd_data.c2c061579478fe.0000000000000007 rbd_data.c2c061579478fe.0000000000000008 rbd_data.c2c061579478fe.0000000000000009 rbd_data.c2c061579478fe.000000000000000a rbd_data.c2c061579478fe.000000000000000b rbd_data.c2c061579478fe.000000000000000c rbd_data.c2c061579478fe.000000000000000d rbd_data.c2c061579478fe.000000000000000e rbd_data.c2c061579478fe.000000000000000f rbd_data.c2c061579478fe.0000000000000010 rbd_data.c2c061579478fe.0000000000000011 ... rbd_data.c2c061579478fe.000000000009c3f6 rbd_data.c2c061579478fe.000000000009c3f7 rbd_data.c2c061579478fe.000000000009c3fa rbd_data.c2c061579478fe.000000000009c3fb rbd_data.c2c061579478fe.000000000009c3fc rbd_data.c2c061579478fe.000000000009c3fd rbd_data.c2c061579478fe.000000000009c3fe rbd_data.c2c061579478fe.000000000009c3ff rbd_header.c2c061579478fe thanks