Dear (p)NFS-ors,
we observe VERY unpleasant situation with pNFS in the production.
Our hosts run multiple DSes on different ports, usually 24001-24009.
With CentOS7 (3.10.0-514.6.2.el7.x86_64) we see that client takes
a wrong port number when talks to data server:
If client uses different DSes on the same host, then at some point it starts
to send data to the wrong port number:
Client <=> MDS:
1 0.000000000 131.169.251.53 → 131.169.51.35 NFS V4 Call OPEN DH: 0x7cbc716b/MIL-68-onebatch-80C-30s-00057.tif.metadata
2 0.001469799 131.169.51.35 → 131.169.251.53 NFS V4 Reply (Call In 1) OPEN StateID: 0xec18
3 0.001578128 131.169.251.53 → 131.169.51.35 NFS V4 Call SETATTR FH: 0x6ccf3dfa
4 0.002657187 131.169.51.35 → 131.169.251.53 NFS V4 Reply (Call In 3) SETATTR
5 0.003243819 131.169.251.53 → 131.169.51.35 NFS V4 Call LAYOUTGET
6 0.014603386 131.169.51.35 → 131.169.251.53 NFS V4 Reply (Call In 5) LAYOUTGET
7 0.014899121 131.169.251.53 → 131.169.51.35 NFS V4 Call GETDEVINFO
8 0.015014216 131.169.51.35 → 131.169.251.53 NFS V4 Reply (Call In 7) GETDEVINFO
Opcode: GETDEVINFO (47)
Status: NFS4_OK (0)
layout type: LAYOUT4_NFSV4_1_FILES (1)
device index: 0
r_netid: tcp
length: 3
contents: tcp
fill bytes: opaque data
r_addr: 131.169.51.50.93.197
length: 20
contents: 131.169.51.50.93.197
r_netid: tcp
length: 3
contents: tcp
fill bytes: opaque data
r_addr: 131.169.51.50.93.197
length: 20
contents: 131.169.51.50.93.197
notification bitmap: 6
notification bitmap: 0
[Main Opcode: GETDEVINFO (47)]
9 0.105442455 131.169.251.53 → 131.169.51.35 NFS V4 Call TEST_STATEID
10 0.105521354 131.169.51.35 → 131.169.251.53 NFS V4 Reply (Call In 9) TEST_STATEID
NOTICE, that 131.169.51.50.93.197 corresponds to port 24005.
client <=> DS
$ tshark -r ds-write.pcap -n -z conv,tcp
1 0.000000 131.169.251.53 → 131.169.51.50 NFS V4 Call WRITE StateID: 0xff01 Offset: 0 Len: 3968
2 0.000090 131.169.51.50 → 131.169.251.53 NFS V4 Reply (Call In 1) WRITE Status: NFS4ERR_BAD_STATEID
================================================================================
TCP Conversations
Filter:<No Filter>
| <- | | -> | | Total | Relative | Duration |
| Frames Bytes | | Frames Bytes | | Frames Bytes | Start | |
131.169.51.50:24006 <-> 131.169.251.53:847 1 4240 1 168 2 4408 0.000000000 0.0001
================================================================================
NOTICE, that it talks to DS on port 24006!
Is there know fix which is missing in CentOS7? I can't reproduce it with
4.9 kernel (or it's harder to reproduce).
The packages are attached.
Tigran.
Attachment:
ds-write.pcapng
Description: application/pcapng
Attachment:
mds.pcapng
Description: application/pcapng
