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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0017622||CentOS-8||xfsdump||public||2020-07-27 11:22||2020-07-27 11:22|
|Platform||x86_64||OS||Centos 8||OS Version||8.1.1911|
|Summary||0017622: xfsdump is unable to complete when high disk I/O|
|Description||When there is a high input/output on the disks, the xfsdump is unable to finish.|
This is because it calls "sync" and it takes ages to complete.
This is when I try to dump a filesystem on one device and the high I/O is on another.
The stack looks as below:
[root@vh3 ~]# cat /proc/3661/stack
This is a huge problem, as it makes backups impossible.
|Steps To Reproduce||The setup I have is:|
two mirrors, total 4 drives:
first mdadm mirror, on this LUKS, then LVM and xfs filesystems on logical volumes, 600 GB total, on SAS controller
second mdadm mirror, on this LUKS, the deice size is 10 TB on SATA controller
Start a lot of writes to the second mirror "cat /dev/zero | pv > /dev/mdX"
After some time try to xfsdump an xfs filesystem on the first mirror
The xfsdump is stuck as it calls "sync" syscall.
As the 10TB write takes about 15 hours - the sync doesn't complete unless all writes are finished.
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