so I've been running CentOS Servers for quite a while, mostly for personal use, and now I'm encountering a frequently reoccurring issue on my owncloud/nextcloud Virtual Machine.
I have a Hyper-V Host (yes, I know - no opportunity atm to change the Hypervisor) with a Hardware RAID 5 (HP Smart Array P410) running a load of Virtual Machines (about 20 or 30) and only one of them, namely my nextcloud VM is frequently stopping with the following error message:
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blk_update_request: I/O error, dev sda, sector 23600528
XFS (sda3): metadata I/O error: block 0x1187590 ("xlog_iodone") error 5 numblks 64
XFS (sda3): Log I/O Error Detected. Shutting down filesystem
XFS (sda3): Please unmount the filesystem and rectify the problem(s)
I already did filesystem checks but they didn't find anything. Also the RAID controller (newest firmware installed) doesn't mark any drive as defective.
One more important information: I'm doing backups using Virtual Machine Snapshots and it may be, that the VM is always crashing during backup. Either because it is then trying to read the problematic sector or because of some I/O stall caused by Snapshot creation/deletion.
Anyone got an idea regarding this? Might there be some I/O timeout which kicks in? I'm using Veeam for the backup and "Application-aware processing" is disabled for this VM, as this feature mostly doesn't play very nice with Unix machines (if even compatible).
Thanks!
edit: sorry, I forgot some spec details:
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[root@owncloud ~]# uname -a
Linux owncloud 3.10.0-514.6.1.el7.x86_64 #1 SMP Wed Jan 18 13:06:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@owncloud ~]# cat /etc/centos-release
CentOS Linux release 7.3.1611 (Core)