FreeNAS asynchronous writes with xcp-ng

fred974 · February 13, 2019, 3:55pm

Hi Tom,

I am seeing that in your video you are using FreeNAS iSCSI as strorage for your Xcp-ng servers.
On the FreeNAS, how do you handle the asynchronous writes generated by the hypervisor?
Do you have a dedicated ssd disk for SLOG or simply set sync=always in FreeNAS?

Thank you

LTS_Tom · February 13, 2019, 4:54pm

It matters more with NFS, but you can turn that off in FreeNAS on per dataset. Also I moved over to NFS shares with my new server.

fred974 · February 13, 2019, 5:17pm

Interesting, can you share why? the Video you did iSCSI vs NFS pointed to iSCSI been better

LTS_Tom · February 13, 2019, 5:38pm

Just for testing on our new server. The speed difference is quite marginal.

fred974 · February 13, 2019, 6:36pm

So which would you recommend in production?

LTS_Tom · February 13, 2019, 8:16pm

iSCSI can be a bit more processor intensive, but both are fine, which ever one you prefer.

rfahey · March 18, 2019, 4:32pm

when using either method is the preferred practice to make the shares available to the hypervisor then create virtual disks for your VMs? Or would you link the pool directly to your VM?