Hey all. Apologies for yet another noob question. I’ve recently set up my first truenas. I went for a RAIDZ2 across five 4Tb drives making a single vdev. I’ve added another 5Tb drive – I know I lose a Tb but happy to do that and use a drive I had idle – and now have a capacity of 12.79TiB.
My question is using a calculator (wintelguy calculator) I should have a capacity of 14.05TiB. Have I missed a step in the process?
Although there is some usable space loss to file system overhead, that will depend in part on your recordsize, I believe most of this is a reporting issue. There are some challenges doing the space reporting for RAIDZ expanded vdevs. See for example;
Which version of TrueNAS? What recordsize are you using (I think the default is 128K).
Thanks for the response! I’ve upgraded to Fangtooth, and I’m using 128K (definitely not the sort of thing I was going to change on the first system).
I’ll have a read of the other threads. My searching seems to be pretty poor, so my thanks again for the pointers!
