[Xen-users] xen domU disk on nfs shared file

[Kojedzinszky Richárd <kojedzinszky.richard@xxxxxxxxxxxx>]

Dear all,

We are facing a regular lockup with our xen setup. We have an nfs share 
mounted on the xen dom0, where the vm images are served, and those files 
are given to xen domUs.
I was just preparing an experiment, where I created a 100G file on the 
host:
# truncate -s 100G /srv/nfs/domU/disk2
And after added this disk to the instance's configuration.

On the host this is the mountpoint:
# mount|grep srv/xen
10.1.1.1:/mnt/main/vps on /srv/xen type nfs 
(rw,relatime,vers=3,rsize=16384,wsize=16384,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.1.1.1,mountvers=3,mountport=4045,mountproto=udp,local_lock=none,addr=10.1.1.1)
After starting the instance I partitioned the disk with gdisk, and created 
an xfs fs on it. While the fs has been created well, strange messages 
appeared on the console:
[   23.787504] blk_update_request: I/O error, dev xvdc, sector 2048
[   23.788904] blk_update_request: I/O error, dev xvdc, sector 8390655
[   23.789611] blk_update_request: I/O error, dev xvdc, sector 16779262
[   23.790359] blk_update_request: I/O error, dev xvdc, sector 25167869
[   23.791148] blk_update_request: I/O error, dev xvdc, sector 33556476
[   23.791498] blk_update_request: I/O error, dev xvdc, sector 41945083
[   23.791498] blk_update_request: I/O error, dev xvdc, sector 50333690
[   23.791498] blk_update_request: I/O error, dev xvdc, sector 58722297
[   23.791498] blk_update_request: I/O error, dev xvdc, sector 67110904
[   23.791498] blk_update_request: I/O error, dev xvdc, sector 75499511

I dont think that this is normal. If I chose a local block device 
(probably lvm) for the domU, this does not appear.
The host is running xen-4.4 with 3.16.0-4-amd64 kernel (debian jessie 
stock), the domU is running 4.3.0-0.bpo.1-amd64 (jessie backport, 4.4.4).
I suspect those messages should not be there.

Regards,

Kojedzinszky Richárd
Euronet Magyarorszag Informatika Zrt.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users