Comment 0 for bug 1456985
Revision history for this message
| Frederik Bosch (f-bosch) wrote Filesystem goes read-only while creating VSS snapshot on HyperV | #0 |
© 2004
Canonical Ltd.
•
Terms of use
•
Data privacy
•
Contact Launchpad Support
•
Blog
•
Careers
•
System status
•
bbfa235
(Get the code!)
Filesystem goes read-only while creating VSS snapshot on HyperV
Because "ubuntu-bug linux" not works because I am on kernel 3.19.0-17, I create this report manually.
Summary of problem: we create VSS snapshots with HyperV of 4 linux virtual machines. There is 1 CentOS machine (XFS) and 3 Ubuntu 14.04 machines (EXT4). Problems occur on the Ubuntu machine only and have occurred on multiple hypervisors (physical machines). During the start or at the end of the creation of a snapshot, the filesystem switches to read-only mode. This happens at completely random moments: at least we are not able to detect a pattern. What we find weird is that the CentOS machine with XFS is not having any problems.
What actions did we undertake to get rid of problem? We tried multiple backup strategies with HyperV. When this was not successful, we were adviced by the #ubuntu-kernel chat channel to upgrade our kernel to 3.19.0-17 (coming from 3.13.0-52). The reasons that this could solve the problem is that hyperv backups require freeze and thaw methods (https:/
The message we get from dmesg when the filesystem goes read-only is as follows on the 3.19.0-17 kernel:
[85630.239889] blk_update_request: I/O error, dev sda, sector 201697672
[85630.239931] Aborting journal on device sda1-8.
[85630.253386] EXT4-fs error (device sda1): ext4_journal_
[85630.253428] EXT4-fs (sda1): Remounting filesystem read-only
While it was as follows on the 3.13.0-52 kernel:
[66392.076569] end_request: I/O error, dev sda, sector 65127256
[66392.076610] Aborting journal on device sda5-8.
[66392.280052] EXT4-fs error (device sda5): ext4_journal_
[66392.280090] EXT4-fs (sda5): Remounting filesystem read-only
[66392.482903] EXT4-fs error (device sda5): ext4_journal_
System details:
- Version signature: Ubuntu 3.19.0-
- lspci.log: http://
- boot.log: http://