Hi folks,
Just wondering if anyone could clear up a question about expected
behavior for the performance/writebehind translator.
I'm using Gluster 3.3, with a single volume which is distributed to two
bricks on a pair of servers. I have performance.flush-behind=off; the
documentation [1] leads me to expect (but doesn't say explicitly) that
this will make close() block until the write has been flushed - but that
isn't consistent with the behaviour I'm seeing:
$ dd if=/dev/zero of=/shared/vod/zero bs=1024 count=1000; wc -c
/shared/vod/zero
1000+0 records in
1000+0 records out
1024000 bytes (1.0 MB) copied, 0.133975 s, 7.6 MB/s
1016832 /shared/vod/zero
As you can see, the wc doesn't see all of the data which has been
written by dd.
If anyone could clear up whether or not this is expected, I'd be grateful.
Thanks
Richard
[1]
http://gluster.org/community/documentation/index.php/Translators/performance/writebehind
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