[Gluster-users] RDMA inline threshold?
Stefan Solbrig
stefan.solbrig at ur.de
Wed May 30 10:34:01 UTC 2018
Dear Dan,
thanks for the quick reply!
I actually tried restarting all processes (and even rebooting all servers), but the error persists. I can also confirm that all birck processes are running. My volume is a distrubute-only volume (not dispersed, no sharding).
I also tried mounting with use_readdirp=no, because the error seems to be connected to readdirp, but this option does not change anything.
I found to options I might try: (gluster volume get myvolumename all | grep readdirp )
performance.force-readdirp true
dht.force-readdirp on
Can I turn off these safely? (or what precisely do they do?)
I also assured that all glusterd processes have unlimited locked memory.
Just to state it clearly: I do _not_ see any data corruption. Just the directory listings do not work (in very rare cases) with rdma transport:
"ls" shows only a part of the files.
but then I do:
stat /path/to/known/filename
it succeeds, and even
md5sum /path/to/known/filename/that/does/not/get/listed/with/ls
yields the correct result.
best wishes,
Stefan
> Am 30.05.2018 um 03:00 schrieb Dan Lavu <dan at redhat.com>:
>
> Forgot to mention, sometimes I have to do force start other volumes as well, its hard to determine which brick process is locked up from the logs.
>
>
> Status of volume: rhev_vms_primary
> Gluster process TCP Port RDMA Port Online Pid
> ------------------------------------------------------------------------------
> Brick spidey.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49157 Y 15666
> Brick deadpool.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49156 Y 2542
> Brick groot.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49156 Y 2180
> Self-heal Daemon on localhost N/A N/A N N/A << Brick process is not running on any node.
> Self-heal Daemon on spidey.ib.runlevelone.lan N/A N/A N N/A
> Self-heal Daemon on groot.ib.runlevelone.lan N/A N/A N N/A
>
> Task Status of Volume rhev_vms_primary
> ------------------------------------------------------------------------------
> There are no active volume tasks
>
>
> 3081 gluster volume start rhev_vms_noshards force
> 3082 gluster volume status
> 3083 gluster volume start rhev_vms_primary force
> 3084 gluster volume status
> 3085 gluster volume start rhev_vms_primary rhev_vms
> 3086 gluster volume start rhev_vms_primary rhev_vms force
>
> Status of volume: rhev_vms_primary
> Gluster process TCP Port RDMA Port Online Pid
> ------------------------------------------------------------------------------
> Brick spidey.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49157 Y 15666
> Brick deadpool.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49156 Y 2542
> Brick groot.ib.runlevelone.lan:/gluster/brick/rhev_vms_primary 0 49156 Y 2180
> Self-heal Daemon on localhost N/A N/A Y 8343
> Self-heal Daemon on spidey.ib.runlevelone.lan N/A N/A Y 22381
> Self-heal Daemon on groot.ib.runlevelone.lan N/A N/A Y 20633
>
> Finally..
>
> Dan
>
>
>
>
> On Tue, May 29, 2018 at 8:47 PM, Dan Lavu <dan at redhat.com> wrote:
> Stefan,
>
> Sounds like a brick process is not running. I have notice some strangeness in my lab when using RDMA, I often have to forcibly restart the brick process, often as in every single time I do a major operation, add a new volume, remove a volume, stop a volume, etc.
>
> gluster volume status <vol>
>
> Does any of the self heal daemons show N/A? If that's the case, try forcing a restart on the volume.
>
> gluster volume start <vol> force
>
> This will also explain why your volumes aren't being replicated properly.
>
> On Tue, May 29, 2018 at 5:20 PM, Stefan Solbrig <stefan.solbrig at ur.de> wrote:
> Dear all,
>
> I faced a problem with a glusterfs volume (pure distributed, _not_ dispersed) over RDMA transport. One user had a directory with a large number of files (50,000 files) and just doing an "ls" in this directory yields a "Transport endpoint not connected" error. The effect is, that "ls" only shows some files, but not all.
>
> The respective log file shows this error message:
>
> [2018-05-20 20:38:25.114978] W [MSGID: 114031] [client-rpc-fops.c:2578:client3_3_readdirp_cbk] 0-glurch-client-0: remote operation failed [Transport endpoint is not connected]
> [2018-05-20 20:38:27.732796] W [MSGID: 103046] [rdma.c:4089:gf_rdma_process_recv] 0-rpc-transport/rdma: peer (10.100.245.18:49153), couldn't encode or decode the msg properly or write chunks were not provided for replies that were bigger than RDMA_INLINE_THRESHOLD (2048)
> [2018-05-20 20:38:27.732844] W [MSGID: 114031] [client-rpc-fops.c:2578:client3_3_readdirp_cbk] 0-glurch-client-3: remote operation failed [Transport endpoint is not connected]
> [2018-05-20 20:38:27.733181] W [fuse-bridge.c:2897:fuse_readdirp_cbk] 0-glusterfs-fuse: 72882828: READDIRP => -1 (Transport endpoint is not connected)
>
> I already set the memlock limit for glusterd to unlimited, but the problem persists.
>
> Only going from RDMA transport to TCP transport solved the problem. (I'm running the volume now in mixed mode, config.transport=tcp,rdma). Mounting with transport=rdma shows this error, mouting with transport=tcp is fine.
>
> however, this problem does not arise on all large directories, not on all. I didn't recognize a pattern yet.
>
> I'm using glusterfs v3.12.6 on the servers, QDR Infiniband HCAs .
>
> Is this a known issue with RDMA transport?
>
> best wishes,
> Stefan
>
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