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Readynas ultra 6 plus, selecting raid type
I have just upgraded from firmware 4.2.31 to OS 6. After upgrade, it is now doing a resync in xraid mode (Which is the default) My question is, the NAS currently has 6 3TB HDDs installed but will be ...
bolter wrote:
Thanks for the reply. I'm a bit dumb when it comes raidcset up. When you say Raid-5 is that the same as xraid 5. I think I will go with Raid-5
XRAID by default is single-redundancy. If all the disks are the same size, then it uses RAID-5. If the disks are different sizes, then it gets more complicated. But it always offers the same protection guarantee as RAID-5 - protection against loss of a single disk drive in the array.
It's what I use on my own systems.
Some folks prefer RAID-6 (dual redundancy), others RAID-5 (single redundancy).
6x6TB would get you 30 TB in RAID-5, but only 24 TB in RAID-6. What you gain is more protection - RAID-5 can handle a routine single-drive failure, RAID-6 can handle a routine 2-drive failure. It's not that uncommon to have a second disk fail when the RAID array is resyncing from the first failure.
Either way, you need a backup - since there are lots of other ways to lose data that RAID won't protect you from. Power surge, water, flood, theft, NAS chassis failure to name a few.
If you want RAID-6, expansion will be slower - you'll need to upgrade 4 drives to 6 TB before you see any space gain. One way to prevent that is to start with RAID-5 and only 5 disks installed. After you upgrade the 5th disk, you'll have 24 TB in the volume. Then you can install the last drive for redundancy (instead of a larger volume).
As far as XRAID/Flexraid goes, I recommend XRAID right now. With OS6 you can toggle XRAID on and off, so it isn't a big deal unless you want multiple volumes.
Since you are planning expansion, make sure you don't use the disk encryption option. Vertical expansion isn't supported if you use that - neither are mixed disk sizes.
Thanks for the reply. I'm a bit dumb when it comes raidcset up. When you say Raid-5 is that the same as xraid 5. I think I will go with Raid-5
bolter wrote:
Thanks for the reply. I'm a bit dumb when it comes raidcset up. When you say Raid-5 is that the same as xraid 5. I think I will go with Raid-5
XRAID by default is single-redundancy. If all the disks are the same size, then it uses RAID-5. If the disks are different sizes, then it gets more complicated. But it always offers the same protection guarantee as RAID-5 - protection against loss of a single disk drive in the array.
It's what I use on my own systems.
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