Time Machine cannot mount remote backup disk (ReadyNAS NV+)

Hello,
I own a ReadyNAS NV+ which I use as an external backup. It has a "Time Machine" backup daemon, so the iMac see's it over network. I used it for a couple of months without issues.
A couple of days ago I had to change the physical location of ReadyNAS. Now there are 2 switches between my iMac and the readyNAS.
Since I changed the physical position of the ReadyNAS I try to backup using time machine but it's not possible. Time machine hangs up when trying to up at "Making Backup Disk Available". Using the terminal I can clearly see that AFP has issues mounting the disk:
afp_4pcsta0oyhi62C4wJd3Bx6yh-1.2e00000b on /Volumes/ReadyNAS (afpfs, nobrowse)
angel:log root# dmesg
6a800!
jnl: disk3s2: journal_open: Error replaying the journal!
hfs: early jnl init: failed to open/create the journal (retval 0).
disk3s2: 0x5 (UNDEFINED).
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 2] [LBlkNum 2] [FSLogMsgID 1814855696] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode devfs] [MountPt /dev] [Path /dev/disk3s2] [FSLogMsgID 1814855696] [FSLogMsgOrder Last]
AFP_VFS afpfs_unmount: /Volumes/ReadyNAS, flags 524288, pid 285
AFP_VFS afpfs_mount: /Volumes/ReadyNAS, pid 872
jnl: disk4s2: replay_journal: from: 8247296 to: 4564992 (joffset 0x962000)
ASP_TCP dothreadread: no reqInfo found for reqID 5
ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0xa258660
AFP_VFS afpfs_DoReconnect started /Volumes/ReadyNAS prevTrigger 0 currTrigger 1
ASP_TCP CancelOneRequest: cancelling slot 22 error 89 reqID 3256 flags 0x29 afpCmd 0x3D so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 23 error 89 reqID 3257 flags 0x29 afpCmd 0x22 so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 24 error 89 reqID 3258 flags 0x29 afpCmd 0x22 so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 25 error 89 reqID 3259 flags 0x29 afpCmd 0x22 so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 26 error 89 reqID 3260 flags 0x29 afpCmd 0x22 so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 27 error 89 reqID 3261 flags 0x29 afpCmd 0xB so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 28 error 89 reqID 3262 flags 0x29 afpCmd 0x22 so 0xa258660
ASP_TCP CancelOneRequest: cancelling slot 29 error 89 reqID 3263 flags 0x29 afpCmd 0x22 so 0xa258660
0 [Level 5] [com.apple.message.domain com.apple.afpfs.reconnect] [com.apple.message.signature Reconnect failed - socket failed to start reconnect] [com.apple.message.value 1297443679] [Message afpfs_DoReconnect: socket failed to start reconnect 61 /Volumes/ReadyNAS
AFP_VFS afpfs_DoReconnect: posting to KEA to unmount /Volumes/ReadyNAS
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 6] [IOType Write] [PBlkNum 8] [LBlkNum 8] [FSLogMsgID 1662666978] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode afp_4pcsta0oyhi62C4wJd3Bx6yh-1.2e00000a] [MountPt /Volumes/ReadyNAS] [Path /Volumes/ReadyNAS/angel.sparsebundle/bands/0] [FSLogMsgID 1662666978] [FSLogMsgOrder Last]
disk4s2: 0x5 (UNDEFINED).
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 11744] [LBlkNum 11744] [FSLogMsgID 1726805554] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode devfs] [MountPt /dev] [Path /dev/disk4s2] [FSLogMsgID 1726805554] [FSLogMsgOrder Last]
jnl: disk4s2: updatefsblock: error reading fs block # 11744! (ret 5)
disk4s2: 0x5 (UNDEFINED).
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 27379] [LBlkNum 27379] [FSLogMsgID 1933006271] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode devfs] [MountPt /dev] [Path /dev/disk4s2] [FSLogMsgID 1933006271] [FSLogMsgOrder Last]
jnl: disk4s2: dojnlio: strategy err 0x5
jnl: disk4s2: replay_journal: Could not read journal entry data @ offset 0x46a800!
jnl: disk4s2: journal_open: Error replaying the journal!
hfs: early jnl init: failed to open/create the journal (retval 0).
disk4s2: 0x5 (UNDEFINED).
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 5] [IOType Read] [PBlkNum 2] [LBlkNum 2] [FSLogMsgID 800265459] [FSLogMsgOrder First]
0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode devfs] [MountPt /dev] [Path /dev/disk4s2] [FSLogMsgID 800265459] [FSLogMsgOrder Last]
AFP_VFS afpfs_unmount: /Volumes/ReadyNAS, flags 524288, pid 285
AFP_VFS afpfs_mount: /Volumes/ReadyNAS, pid 933
jnl: disk5s2: replay_journal: from: 8247296 to: 4564992 (joffset 0x962000)
angel:log root#
Finally Time Machine exists with error "Backup disk cannot be accessed. error 109".
Can someone give me a hint or two on how to solve this issue?
regards

Not a NAS-specific issue.  The OS is trying to read a block of the sparse disk image, and the read is failing.  Basically, the sparse bundle is damaged.  You'll need to rename it and then try backing up again to a clean sparse bundle.
That said, make sure you're running a version of the ReadyNAS firmware that actually supports Time Machine.  There are several AFP commands that were added for Time Machine that *must* be supported for correct operation, and older AFP implementations did not implement them.  The reconnect errors suggest to me that maybe the firmware you are running doesn't support the Reconnect UAM, in which case it probably also doesn't support the replay cache, etc.  If that's the case, then things probably won't work correctly without a firmware update even after you fix the corrupted sparse bundle.
Edit: actually, on further searching, it might be a NAS-specific issue.  Certain buggy network switches do not properly support jumbo frames in mixed networks, which can cause read errors similar to what you are seeing when working with AFP.  (This might have been your post on the other board.)  In the Network prefs pane, choose Ethernet, click "Advanced", click the Ethernet tab, change Configure to Manually, and set the MTU to Standard (1500).

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