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 <[email protected]> wrote: > On 09/04/18 16:49, Vincent Royer wrote: > > >> Is a flash-backed Raid required for JBOD, and should it be 1gb, 2, or 4gb >> flash? >> > > 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. > > 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. > > > -- > This message is intended only for the addressee and may contain > confidential information. Unless you are that person, you may not > disclose its contents or use it in any way and are requested to delete > the message along with any attachments and notify us immediately. > This email is not intended to, nor should it be taken to, constitute advice. > The information provided is correct to our knowledge & belief and must not > be used as a substitute for obtaining tax, regulatory, investment, legal or > any other appropriate advice. > > "Transact" is operated by Integrated Financial Arrangements Ltd. > 29 Clement's Lane, London EC4N 7AE. Tel: (020) 7608 4900 Fax: (020) 7608 5300. > (Registered office: as above; Registered in England and Wales under > number: 3727592). Authorised and regulated by the Financial Conduct > Authority (entered on the Financial Services Register; no. 190856). > > > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://lists.gluster.org/mailman/listinfo/gluster-users >
_______________________________________________ Gluster-users mailing list [email protected] http://lists.gluster.org/mailman/listinfo/gluster-users
