Hello!
Running a completely new testcluster with status HEALTH_OK i get the same error.
I'm running Ubuntu 14.04 with kernel 3.16.0-70-generic and ceph 10.2.0 on all
hosts.
The rbd-nbd mapping was done on the same host having one osd and mon. (This is
a small cluster with 4 virtual hosts and one osd per host).
Steps after creating cluster.
Created rbd device with standard options.
#rbd create --size 50G nbd2
Map the device (became device /dev/nbd2)
#rbd-mbd map nbd2
Create ext4 filesystem
#mkfs.ext4 /dev/nbd2
During creation of filesystem there was alot of errors in dmesg but mkfs
indicated done.
The errors was block nbd2: Other side returned error (5)
I was able to mount the ext4 filesystem but that created even more errors in
dmesg.
Here is a selection of dmesg that probably contains the intresting bits.
[13864.102569] block nbd2: Other side returned error (5)
[13951.186296] block nbd2: Other side returned error (5)
[13951.186443] blk_update_request: 2157 callbacks suppressed
[13951.186445] end_request: I/O error, dev nbd2, sector 0
[13951.186598] quiet_error: 271152 callbacks suppressed
[13951.186600] Buffer I/O error on device nbd2, logical block 0
[13951.186780] lost page write due to I/O error on nbd2
[13951.187816] EXT4-fs (nbd2): mounted filesystem with ordered data mode. Opts:
(null)
[13952.049103] block nbd2: Other side returned error (5)
[13952.049323] end_request: I/O error, dev nbd2, sector 8464
[13952.070722] block nbd2: Other side returned error (5)
[13952.071009] end_request: I/O error, dev nbd2, sector 8720
[13952.074069] block nbd2: Other side returned error (5)
[13952.074392] end_request: I/O error, dev nbd2, sector 8976
[13952.075283] block nbd2: Other side returned error (5)
[13952.075635] end_request: I/O error, dev nbd2, sector 9232
[13952.076249] block nbd2: Other side returned error (5)
[13952.076636] end_request: I/O error, dev nbd2, sector 9488
[13952.077108] block nbd2: Other side returned error (5)
[13952.077606] end_request: I/O error, dev nbd2, sector 9744
[13952.078064] block nbd2: Other side returned error (5)
[13952.078537] end_request: I/O error, dev nbd2, sector 10000
[13952.079038] block nbd2: Other side returned error (5)
[13952.079583] end_request: I/O error, dev nbd2, sector 10256
[13952.080301] block nbd2: Other side returned error (5)
[13952.080869] end_request: I/O error, dev nbd2, sector 10512
[13952.081474] block nbd2: Other side returned error (5)
[13952.082088] block nbd2: Other side returned error (5)
[13952.082701] block nbd2: Other side returned error (5)
[13952.083316] block nbd2: Other side returned error (5)
[13952.083943] block nbd2: Other side returned error (5)
[13952.084654] block nbd2: Other side returned error (5)
[13952.085301] block nbd2: Other side returned error (5)
Otherwise this rbd-nbd is really interesting since the krbd is often far behind
in functionality and upgrading kernel is not always possible for other reasons,
so being able to use a user-space client is really great.
Best regards
Stefan Lissmats
________________________________
Från: ceph-users [ceph-users-boun...@lists.ceph.com] för Mika c
[mika.leaf...@gmail.com]
Skickat: den 21 april 2016 05:47
Till: ceph-users
Ämne: [ceph-users] RBD image mounted by command "rbd-nbd" the status is
read-only.
Hi cephers,
Read this post "CEPH Jewel
Preiew<http://www.sebastien-han.fr/blog/2016/04/04/ceph-jewel-preview-map-rbd-devices-on-nbd/>"
before.
Follow the steps can map and mount rbd image to /dev/nbd successfully.
But I can not write any files. The error message is "Read-only file system".
Is this feature still in the experimental stage？
Best wishes,
Mika
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