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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 ...
Ok, first off, per your description, you are not in JBOD configuration. With JBOD, each drive is a separate volume, and you can easily remove one. It sounds like you are in RAID0 mode, where all drives are combined into a single volume with no redundancy. That is the most vulnerable configuration, because the loss of any drive loses everything.
Second, you said you want XRAID so you don't have to make backups. RAID is not a backup system. It is more fault tolerant than not having it, but there are plenty of bad things that can destroy the whole volume. You'll find lots of examples here in the forum.
While BTRFS does have the capability to shrink a RAID volume, Netgear has not implemented that in ReadyNAS OS6. You could SSH in and try it manually, but you really will need to have a full backup before you try just in case it fails. Then you could still do a factory default, choose XRAID, and restore the backup -- which is the supported way to make that change.
Sandshark wrote:
With JBOD, each drive is a separate volume
Nope. You can have a single JBOD per disk, but you can also have a single JBOD on several disks. Already had that discussion here and already proved it.
Sandshark wrote:While BTRFS does have the capability to shrink a RAID volume, Netgear has not implemented that in ReadyNAS OS6
Because the RAID array uses mdadm, not BTRFS. On top of the RAID array is built a BTRFS volume, but BTRFS doesn't take care of the RAID. Which is a good thing as BTRFS RAID5/6 is currently considered as "badly broken".
OP's need is simple, backup the data, go back to an X-RAID compatible volume configuration, insert the all drives, activate X-RAID and leave the NAS do the rest.
jak0lantash wrote:
Sandshark wrote:
With JBOD, each drive is a separate volumeNope. You can have a single JBOD per disk, but you can also have a single JBOD on several disks. Already had that discussion here and already proved it.
Not by everybody else's definitiion of "JBOD", so I guess Netgear is re-purposing terminology. But I can see not wanting to use "RAID0" since it's not redundant while "RAID" implies it is. And RAID0 also implies striping, and I think they are not doing that, either. Most use "spanned" as the term for that. It's still just as vulnerable -- lose one drive and you lose the entire volume.
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