Hi Andy!

Forgot to answer the VM part - yes, this is a VM running on VMWare. This is what mount shows:

/dev/mapper/vg0-root on / type ext4 (rw,relatime,errors=remount-ro,data=ordered)

I.e. a normal ext4 filesystem on LVM.

We have plenty of VMs pretty much exactly like this and haven't experienced any filesystem related problems that I know of.


PS. I've been trying to reproduce this with smaller data, but so far to no avail. But by digging the logs I noticed that the same problem appeared also in another TDB2 database that's configured within the same Fuseki instance on the same server. Also in that case the errors appeared soon after loading some new triples into specific graphs, overwriting their previous content.

One other question - is any of this docker or a VM, if so, what is the filesystem setup?

No, this is not Docker. Ubuntu 16.04 LTS amd64 with Java 9:

openjdk version "9-internal"
OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src) OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode)

Just tell me what you really need (considering the size of the files) and I will send them to you.


Osma Suominen
D.Sc. (Tech), Information Systems Specialist
National Library of Finland
P.O. Box 26 (Kaikukatu 4)
Tel. +358 50 3199529

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