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Hi, I have three servers in the linked list topology [1], GlusterFS
3.8.10, CentOS 7. Each server has two bricks, both on the same XFS
filesystem. The XFS is constructed over the whole MD RAID device: Everything works fine until one of the RAID devices starts its
regular check. During the check, the client's mount sometimes
completely stops responding. I'm mounting using the Pacemaker's
Filesystem OCF RA [2] with OCF_CHECK_LEVEL=20,
which basically tries to write a small status file to the
filesystem every 2 minutes to see if its OK. But even this small
write operation sometimes times out (2 minutes) during the
check. Pacemaker then remounts the Gluster and everything goes
back to normal. I understand that the RAID check is draining a lot of I/O performance, but the underlying XFS remains responsive (of course it is slower, but by far not as much as Gluster). The check intervals on the servers are not overlapping. I've even decreased the /proc/sys/dev/raid/speed_limit_max from the default 200 MB/s to the 50 MB/s, but it helped only a little, the mount still tends to freeze for a few seconds during the check. What are your suggestions to solve this issue? Regards, [1]
https://joejulian.name/blog/how-to-expand-glusterfs-replicated-clusters-by-one-server/ |
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