What happened to my 4 Tb HDD?
Posted: 29 Sep 2021, 12:05
Hi TerraMaster
I set up a D2-310 as a RAID 1 device with 2 x 3 Tb WD Red HDDs as a Time Machine service for my iMac 2019.
After a good eighteen months with no problems and with space dwindling, I decided to replace the 3Tb drives with 4 Tb Seagate Barracudas.
I hot-swapped one drive and waited for it to be initialized and the data to be mirrored. After both disk lights had returned to green I checked the volume size in the macOS Disk Utility and the size of the array was 3Tb. I assumed that the 4 Tb drive had temporarily been limited to 3 Tb to match the other original drive still in service. I replaced that drive with another Seagate Green HDD and waited for the RAID to mirror over.
When I checked the RAID volume the size was still set to 3 Tb. This was unacceptable as the Time Machine was complaining that it had run out of space, so I erased the drives and set about reformatting them to get them back to 4Tb. No matter what I've done (format as HFS+. APFS, exFAT etc) the drives refuse to return to 4Tb. I've tried the CLI Unix tools, also without success.
Somehow the TerraMaster has reset the volume specification of these drives at a level not accessible to my tools or knowledge and I can't get them to revert to factory spec. Is there a way?
Also, what is the recommended method for replacing drives in a RAID 1 array with larger capacity ones without that extra capacity being lost in the initialization?
I set up a D2-310 as a RAID 1 device with 2 x 3 Tb WD Red HDDs as a Time Machine service for my iMac 2019.
After a good eighteen months with no problems and with space dwindling, I decided to replace the 3Tb drives with 4 Tb Seagate Barracudas.
I hot-swapped one drive and waited for it to be initialized and the data to be mirrored. After both disk lights had returned to green I checked the volume size in the macOS Disk Utility and the size of the array was 3Tb. I assumed that the 4 Tb drive had temporarily been limited to 3 Tb to match the other original drive still in service. I replaced that drive with another Seagate Green HDD and waited for the RAID to mirror over.
When I checked the RAID volume the size was still set to 3 Tb. This was unacceptable as the Time Machine was complaining that it had run out of space, so I erased the drives and set about reformatting them to get them back to 4Tb. No matter what I've done (format as HFS+. APFS, exFAT etc) the drives refuse to return to 4Tb. I've tried the CLI Unix tools, also without success.
Somehow the TerraMaster has reset the volume specification of these drives at a level not accessible to my tools or knowledge and I can't get them to revert to factory spec. Is there a way?
Also, what is the recommended method for replacing drives in a RAID 1 array with larger capacity ones without that extra capacity being lost in the initialization?