Thanks,
I suppose what I'm trying to gain is some clarity on what choice is best for a given application. How do I know if it's better for me to use a raid card or not, to include flash-cache on it or not, to use ZFS or not, when combined with a small number of SSDs in Replica 3.
On Mon, Apr 9, 2018 at 10:49 AM, Alex Crow <acrow@xxxxxxxxxxxxxxxx> wrote:
On 09/04/18 16:49, Vincent Royer wrote:
RAID and JBOD are completely different things. JBODs are just that, bunches of disks, and they don't have any cache above them in hardware. If you're going to use ZFS under Gluster, look at the ZFS docs first. Short answer is no. If Gluster passes sync writes down to the lower level FS as sync, and you decide to use a ZFS SLOG device, usually an SSD, it should have power fail protection capacitors.
Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb flash?
Do *not* use a RAID controller for ZFS, use a decent HBA instead, so ZFS can access the disks directly. Using a RAID controller is not only wasteful it's setting yourself up for a world of pain when a ZFS VDEV member device fails. Don't do it.
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