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On 09/04/18 16:49, Vincent Royer wrote:<br>
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<div>Is a flash-backed Raid required for JBOD, and
should it be 1gb, 2, or 4gb flash?<br>
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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.<br>
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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.<br>
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