Can a DVD drive on another server be used by kodi like a local DVD? Checked iscsi and nbd-client.

arcasys · January 7, 2024 at 3:30 PM

I checked open-scsi and followed the instructions given by chewitt in the thread open-iscsi support for raspberry Pi 3. Creating an image with Iscsi-client worked but I don't have a scsi drive. Maybe it would work, maybe not.

Then I checked nbd-client, which is built into LibreElec:

export the dvd drive on my Ubuntu server unsing nbd-server
the nbd-client command on LibreElec to connect the drive returns with no error
mounting /dev/nbd0 fails with various error messages (dmesg)

Now I made another test and installed ndb-client on my Xubuntu laptop

connecting the remote drive works
mounting /dev/nbd0 works (type seems to be udf, which looks ok)
the disk can be played flawlessly with VLC as if it was in a local drive

Looks good so far, but changing the disk is not recognized and has weird effects on the mount.

Conclusion: Even if nbd-client and mounting the remote drive would work on LibreElec, this will never work like a local drive. In my opinion, it's not worth following up beacuse there are even more problems to be expected...

Maybe someone has more and better ideas.

**chewitt** · January 8, 2024 at 12:15 PM

Quote from arcasys

mounting /dev/nbd0 fails with various error messages (dmesg)

And the errors are?

arcasys · January 8, 2024 at 1:41 PM

Quote from chewitt

And the errors are

First thing: if no disk is inserted in the target drive the nbd-client command fails (short read) and mount caanot find a valid file system on /dev/nbd

If a disk is inserted 'nbd-cleint -p -N share-name target-host /nbd0' command returns with no error

dmesg:

Code

[12607.336769] nbd0: detected capacity change from 0 to 15922560
[12607.755782] block nbd0: Other side returned error (5)
[12607.755823] blk_print_req_error: 2 callbacks suppressed
[12607.755849] I/O error, dev nbd0, sector 15922432 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
[12607.871430] block nbd0: Other side returned error (5)
[12607.871471] I/O error, dev nbd0, sector 15922432 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[12607.871526] buffer_io_error: 22 callbacks suppressed
[12607.871538] Buffer I/O error on dev nbd0, logical block 1990304, async page read
[12607.991723] block nbd0: Other side returned error (5)
[12607.991783] I/O error, dev nbd0, sector 15922432 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[12607.991807] Buffer I/O error on dev nbd0, logical block 1990304, async page read

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mount returns:

mount: mounting /dev/nbd0 on media failed: Invalid argument

dmesg:

Code

[14005.279332] /dev/nbd0: Can't open blockdev
[14005.281426] /dev/nbd0: Can't open blockdev
[14005.289287] /dev/nbd0: Can't open blockdev
[14005.294137] /dev/nbd0: Can't open blockdev
[14005.309858] ISOFS: unsupported/invalid hardware sector size 4096
[14007.968217] block nbd0: Other side returned error (5)
[14007.968277] I/O error, dev nbd0, sector 15921352 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14007.968330] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=1990169, location=1990169
[14008.324575] block nbd0: Other side returned error (5)
[14008.324636] I/O error, dev nbd0, sector 15921336 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14008.324686] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=1990167, location=1990167
[14008.745285] block nbd0: Other side returned error (5)
[14008.745352] I/O error, dev nbd0, sector 4096 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14008.745400] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
[14009.192698] block nbd0: Other side returned error (5)
[14009.192779] I/O error, dev nbd0, sector 15920112 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14009.192832] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=1632832, location=1632832
[14009.538532] block nbd0: Other side returned error (5)
[14009.538622] I/O error, dev nbd0, sector 15920120 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14009.538682] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=1632833, location=1632833
[14010.382490] block nbd0: Other side returned error (5)
[14010.382531] I/O error, dev nbd0, sector 4992 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14010.382599] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
[14010.461530] block nbd0: Other side returned error (5)
[14010.461577] I/O error, dev nbd0, sector 4992 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
[14010.461647] UDF-fs: error (device nbd0): udf_read_tagged: read failed, block=512, location=512
[14010.461666] UDF-fs: warning (device nbd0): udf_fill_super: No partition found (1)
[14010.463071] F2FS-fs (nbd0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[14010.463095] F2FS-fs (nbd0): Can't find valid F2FS filesystem in 1th superblock
[14010.467440] F2FS-fs (nbd0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[14010.467461] F2FS-fs (nbd0): Can't find valid F2FS filesystem in 2th superblock
[14010.468197] /dev/nbd0: Can't open blockdev

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The errors show clearly that nbd-client cannot even handle a share for a dvd. let alone changing disks.

End of story ...

frakkin64 · January 8, 2024 at 11:19 PM

Why not just use NFS? I would be surprised if nbd would detect physical disk changes, it's intended to share a "hard drive or partition" which generally is fixed in size and not hot-swappable. iSCSI would likely be in a similar situation.

**Da Flex** · January 9, 2024 at 4:23 AM

This was the reason why I came to this forum at first. Still an open issue. DVD streaming among two VLC machines worked for me, but a remote mount would be much more elegant.

**chewitt** · January 9, 2024 at 5:16 AM

using Handbrake to rip the ISO to file/files normally always works out quicker

**Da Flex** · January 9, 2024 at 8:36 AM

Quote from chewitt

using Handbrake to rip the ISO to file/files normally always works out quicker

That was also your suggestion when I came here.

If I own the real thing, then I don't want to make copies. MP3s for my mobile player are the only exceptions.

arcasys You should already declare UDF when you mount the DVD:

Code

mount -t udf -o loop /path/to.iso mnt/dvd

**chewitt** · January 9, 2024 at 11:51 AM

I have lots of original copies. I also have kids who are incapable of putting discs away in the correct box and/or without leaving them on the floor where they get scuffed and made unreadable. So all new acquisitions are immediately ripped to a NAS, which makes the entire library kid-proof and navigable without getting up from the sofa

WarpLover · January 10, 2024 at 5:43 PM

Quote from chewitt

getting up from the sofa

unheard of

Can a DVD drive on another server be used by kodi like a local DVD? Checked iscsi and nbd-client.

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