2017-02-22 21:04 GMT+01:00 Joe Julian <joe@xxxxxxxxxxxxxxxx>: > dedup requires massive amounts of memory and is seldom worth it. Yes, but compression is usefull > Which is why I don't like building raid volumes that large. > > Personally, I only use raid on the servers to allow the disk i/o to match > the network i/o. If that means those 12 8TB disks need to be 3 raid 0 > volumes (bricks) where I do sharded replica 3 or disperse volumes to meet my > redundancy requirements, then that's what I'll do. With gluster you could avoid raid, but you still need a filesystem on each brick. RAID or Non-RAID, an XFS fsck still need a week to fix (if able to fix) a 12x 8TB chassis in a non raid configuration. I don't think that fsck is run in parallel, it will blow down the whole server. > This is where people panic about using raid 0. If you've got the redundancy, > that shouldn't be that scary. Do the math and actually calculate your > reliability. I can still get 6 nines with raid 0 bricks. Not to say you > should use raid 0, just to keep an open mind about what possibilities exist > and engineer to your SLA requirements rather than over engineering for > things that may not matter in the long run. I don't like RAID (that's why i'm migrating to gluster) I prefere to use gluster on single bricks _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://lists.gluster.org/mailman/listinfo/gluster-users
