linux-kernel - There is no 'no space' message when using xfs with nfs.

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Message-ID: <CAJ-WH_xqdJVyA7mMmoqAkbJoOcsvgm9cF--NQADfd+pp_oRbEw@mail.gmail.com>
Date:   Sun, 9 Dec 2018 22:07:26 +0900
From:   Guk-Bong Kwon <gbkwon@...il.com>
To:     linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: There is no 'no space' message when using xfs with nfs.

hi all


i use xfs filesystem over nfs


I am using the xfs file system via NFS on two Linux servers.

Even though xfs is full, you will not get a 'no space' message through nfs.

The server's load average goes up and the kworker consumes the CPU.

The server's nfs service is not responding.

When ext3 is full in the same environment, I get a 'no space' message.

Which part of nfs and xfs should be checked?


Below is the environment I am using.


kernel : nfs server 3.4.113 vanilla, nfs client 2.6.32-573.el6.x86_64

nfs : nfs v3 with tcp


==================================================================
nfs server
==================================================================
/dev/mapper/lv2  500G  500G   20K 100% /lv2

/lv2    0.0.0.0/0.0.0.0(rw,async,wdelay,nohide,nocrossmnt,insecure,no_root_squash,no_all_squash,no_subtree_check,insecure_locks,no_acl,fsid=1543743056,anonuid=65534,anongid=65534)


==================================================================
nfs client
==================================================================
10.0.0.20:/lv2   500G  500G   32K 100% /mnt/2

nfsstat  -m
/mnt/2 from 10.0.0.20:/lv2
 Flags: rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=udp,timeo=11,retrans=3,sec=sys,mountaddr=10.0.0.20,mountvers=3,mountport=2047,mountproto=udp,local_lock=none,addr=10.0.0.20


==================================================================
server top log
==================================================================
top - 21:54:10 up 58 min,  0 users,  load average: 8.50, 8.37, 8.83
Tasks: 347 total,   2 running, 345 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  4.2%sy,  0.0%ni, 95.8%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
12368 root      20   0     0    0    0 S   12  0.0   4:32.44 kworker/2:2
11092 root      20   0     0    0    0 S   10  0.0   4:42.57 kworker/3:1
11166 root      20   0     0    0    0 R    9  0.0   2:09.47 kworker/5:1
12473 root      20   0     0    0    0 S    8  0.0   2:09.36 kworker/4:2
 2944 root      20   0     0    0    0 D    6  0.0   2:09.10 nfsd
 2953 root      20   0     0    0    0 D    6  0.0   2:24.65 nfsd
 3024 root      20   0     0    0    0 D    6  0.0   2:23.12 nfsd