iobuf/iobref error

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Hi:

I'v been experiencing an intermittent issue with GlusterFS in 30 nodes cluster which makes the mounted file system unavailable through the GlusterFS client.

The symptom is:

$ ls /gluster
ls: cannot access /gluster: Transport endpoint is not connected

the client log reports the following error:

[2016-08-09 23:25:36.012877] E [iobuf.c:759:iobuf_unref] (--> /usr/lib64/libglusterfs.so.0(_gf_log_callingfn+0x1e0)[0x371a220580] (--> /usr/li
b64/glusterfs/3.6.7/xlator/performance/quick-read.so(qr_readv_cached+0xb7)[0x7ff57f318ea7] (--> /usr/lib64/glusterfs/3.6.7/xlator/performance/
quick-read.so(qr_readv+0x62)[0x7ff57f3194c2] (--> /usr/lib64/libglusterfs.so.0(default_readv_resume+0x14d)[0x371a22a75d] (--> /usr/lib64/libgl
usterfs.so.0(call_resume+0x3d6)[0x371a2424b6] ))))) 0-iobuf: invalid argument: iobuf
[2016-08-09 23:25:36.013192] E [iobuf.c:865:iobref_unref] (--> /usr/lib64/libglusterfs.so.0(_gf_log_callingfn+0x1e0)[0x371a220580] (--> /usr/l
ib64/glusterfs/3.6.7/xlator/performance/quick-read.so(qr_readv_cached+0xc1)[0x7ff57f318eb1] (--> /usr/lib64/glusterfs/3.6.7/xlator/performance
/quick-read.so(qr_readv+0x62)[0x7ff57f3194c2] (--> /usr/lib64/libglusterfs.so.0(default_readv_resume+0x14d)[0x371a22a75d] (--> /usr/lib64/libg
lusterfs.so.0(call_resume+0x3d6)[0x371a2424b6] ))))) 0-iobuf: invalid argument: iobref

seems to me it's the out-of-memory issue.


info: glusterfs is configured as follows

performance.io-thread-count: 4
performance.cache-max-file-size: 0
performance.write-behind-window-size: 64MB
performance.cache-size: 4GB
cluster.consistent-metadata: on

and each node in cluster are deployed both glusterfs client and server.


is there any way to ease the above issue via modify configuration? such as increase cache-size, or some other paramters?

thx.
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