FDB v7 writing only to one disk out of five

Using FoundationDB
1

Hi,

We recently upgraded from FDB v6 to FDB v7. We’re running performance tests for this. We have a six node setup, and that setup has been replicated for the new fdb server because we’re also upgrading OS etc. What we’re observing, is in the FDB v6 setup, for a particular node, out of 5 disks, 3 are being written to. But for the FDB v7 setup, for a particular node, out of 5 disks, only one is being primarily written to. Is there a config that we can set to affect this distribution of load?

Thanks

2

I suspect this is related to your configuration. Stateful roles, i.e., tlogs or storage servers, will use disks, specified in the configuration’s datadir:

## Default parameters for individual fdbserver processes
[fdbserver]
command = /usr/sbin/fdbserver
public-address = auto:$ID
listen-address = public
datadir = /var/lib/foundationdb/data/$ID
logdir = /var/log/foundationdb

So to use the disks, you’ll need to configure the processes to utilize available disks.