Pro pioneer 2TB -> 3TB disks

No 4TB drives have been qualified at this time. Some users report success with these disks but NetGear can and will deny support if you run into issues using 4TB disks.

There are some 3TB disks on the list.

What disks were installed when you last did a factory default? Were all six 2TB disks installed or some other disk configuration?

What RAID configuration are you using e.g. X-RAID2 dual-redundancy?

6 times 2TB RE4-GP WD's at the last reset.
They were all installed at once, in xraid 2 with single redundancy.

I figured the 4tb disks are not on the list yet, they're not generally available here either I think, but thankfully there is no urgency to expand my nas yet


[edit]
mmm i just noticed the release notes:

Volume expansion will not work beyond 16 TB. To support 16 TB or greater, you’ll have to factory default with that capacity in place.

Yes you do need to be aware of that limitation. You wouldn't hit that limit if you were to upgrade to 3TB disks.

Guessing the 16TB limit has something to do with block size ?

Actually it's to do with the e2fsprogs expansion utility.

I have Ultra6+ with 6x2TB with factory default done on 4.2.19 firmware. Can I expand it one by one with 6x3TB (single redundancy)? I'm asking because some information found here are not so clear to me.

So you had all six disks installed when you did the factory default? You should be able to replace the disks one by one to expand the volume. Personally though with that much data I'd feel much more comfortable using dual-redundancy. However to use dual-redundancy you'd have to backup your data and do a factory default (wipes all data, settings, everything).

Yes, I did factory default with all six (same) drives. And about single - dual redundancy I will think of it. Thanks:)

I suggest you REALLY rethink about moving to Dual redundancy and do it now while you have the room and hopefully the redundancy for the rebuild.

Read this, Why Raid5(Single Redundancy) is not enough and why Raid6(Dual Redundancy) is better. Raid5 Failures HDD MTBF XRaid2 Raid6 Dual Redundancy viewtopic.php?f=11&t=42989

I have had a failed raid5 rebuild and it was not pretty. I had to individually extract the raid5 partitions from the hdd's and rebuild with software. you can imagine the time taken.

RAID-6 is a reasonable thing to do with a large array, but it is still not a substitute for backup.

Though the analysis in the linked thread is (in my opinion) misleading, there are certainly many people here who (like MrCyberdude) have been burned because they trusted too much in RAID protection.