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Forum Discussion
Converting JBOD TO XRAID
Hi all new here, please be gentle. I have a Readynas 104 with latest firmware. I have two problems. (questions) For some reason the DLNA seems to keep playing up or vanishing. While my TiVo was ...
Hi thanks, I've read someone else with the same setup have the problem where the guy ended up posting a photo to prove he really was in JBOD mode. As I can't see any option here to post a photo,
The new drives were black, formatted, I expanded them both, now all four drives are blue. They cannot be selected individually, but if you hover the mouse over a drive a window you get the stat's, and no options. The only button I can press is "xraid" that is Not lit at present, and when I do press it I get a waning that it can't continue because I have an expanded volume.
The box on the left shows the full volume size of all four drives. Under the for blue drive picture it says.
(jbod). Definitely!
If the redundancy is no good as a backup I'll just leave it the way it is and keep backing it up manually.
Kinda makes me wonder what the point of RAID if it doesn't "completely" protect my data.
The new drives were black, formatted, I expanded them both, now all four drives are blue. They cannot be selected individually, but if you hover the mouse over a drive a window you get the stat's, and no options. The only button I can press is "xraid" that is Not lit at present, and when I do press it I get a waning that it can't continue because I have an expanded volume.
The box on the left shows the full volume size of all four drives. Under the for blue drive picture it says.
(jbod). Definitely!
If the redundancy is no good as a backup I'll just leave it the way it is and keep backing it up manually.
Kinda makes me wonder what the point of RAID if it doesn't "completely" protect my data.
RAID is not useless, it's just imperfect. And while a completely separate backup is also imperfect, at least a single event short of fire, flood, tornado, theft, or massive power surge is unlikely to take out both. Hopefully, RAID (except RAID0, which isn't really RAID since the "R" stands for "Redundant" and RAID0 isn't) keeps you from having your NAS down while you replace a bad drive and restore all your data, as would be necessary without redundancy. But to count on that always being the case is putting too many eggs in one basket
What can go wrong? Well, it happened to me and I never really found out. I did a factory default and restored my backup and all was fine. That was on an NVX with OS4.2.x. Loss of a second drive, which is more likely during a resync when one is replaced, is certainly one of the more common ones. But I've seen others where I think a drive was so bad that it affected the NAS's ability to access the others. And then either something it did on it's own, or something the user did without all the right information, killed the whole array. Accidently removng the wrong drive from an array with one bad one is one of the more common operator-induced reasons.
Having never used JBOD or RAID0 except when just running with a single disk for testing, I can't say if Netgear uses the right terms for JBOB and RAID0. Maybe they don't call it RAID0 because that gives some a false sense of security that they have "real" RAID. Or maybe expanding from one to more drives just fails to properly indicate the change.
"Just a Bunch Of Disks" doesn't mean a single disk.
I agree with the rest though.
When considering the security of your data, you need to ask yourself questions about what you want/need that backup to be (non exhaustive list):
- Can it survive hardware failure? To what extent? Like a disk failure, chassis failure, multiple disk failure.
- Can it survive software failure? To what extent? Like filesystem corruption, bit rot.
- Can it survive human error? To what extent? Like accidental file deletion.
- Can it survive catastrophic failure? To what extent? Like fire, theft, complete destruction of the machine.
- Can it survive attack? To what extent? Like a hack, a ransomware.
- Do I need versionning?
- Do I need to know the exact content of the source at a given time, or any file that was into it at any time?
- How fast do I need to be able to recover from backup in case of an above situation?
- Can I rely on Internet connection speed?
- Am I ready to pay for online storage/services?
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