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How to do incremental vertical expansion in FlexRAID mode using SSH commands
So, Netgear only lets you do vertical expansion in FlexRAID if you replace all of the drives in the volume. I'm here to tell you that, as long as you are comfortable with the command line via SSH, yo...
Thanks for posting. Have you tried reversing an expansion? The most common scenario here is someone adding their second disk, and expecting jbod or RAID-0 instead of RAID-1.
Sandshark wrote:
Now, this process also seems to allow you to expand a RAID6 with just two drives in a RAID1 layer or three in a RAID5.
Another option (which maintains dual redundancy) is three in RAID-1.
Sandshark wrote:
It should also allow you to expand by adding drives smaller than the largest in the system. Just create the partition(s) and add to an existing RAID group. XRAID won't let you do that.
If the partition size matchs the size of an existing RAID group that will work (and although Netgear doesn't say much about it, XRAID also will work in that case). For example, if you had 2x4TB, and later expanded it to 2x6TB then XRAID in OS 6 will actually accept a third 4 TB drive.
But if you had 2x6TB to begin with, you can'd add a 4 TB drive to that RAID group. You'd have to create a new group (on new drives).
Yes, there are some additional specifics about expansions I didn't cover. Thanks for adding that.
I started on the experiment of removng a drive and the whole thing locked up on a re-sync again. Wish I knew which drive was causing that. I'm starting over, but with a simpler system: 3x1TB RAID5 changing to 2x1TB RAID2 because I know the troublesome drive is one of the 2TB ones. From there, I can try going back to a single drive so the second can be added as RAID0 or JBOD. From what I've read, that second step is actually pretty straightforward since each drive contains all the data.
I've got the RAID sync'ed and am adding some data. So, unless it all crashes down on me again, I should have some results in a couple days.
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