ChristopherN
Cadet
- Joined
- Aug 22, 2017
- Messages
- 7
I'm setting up a FreeNAS box as a backup device. As there will be no data there that isn't also online on other drives, I'm currently planning to make it a RAIDZ1 array.
The impetus for setting up this system has been a MythTV box that was running low on space. It had three 3TB drives. My main desktop machine had 3 more 3TB drives for the backup of the media files. With the Myth box needing more space, and limited case space, I decided it was time to put 6TB drives in the Myth box. So, now I had 6 working 3TB drives that don't suit the purpose anymore. I bought one more 6 TB drive with the intention of setting up a RAID array like this:
logical device 1 : two 3TB drives striped into a single 6TB volume
logical device 2 : as above
logical device 3 : as above
logical device 4 : one 6TB drive
Then I would put these 4 logical devices into a single RAIDZ1 with a capacity of 18TB.
If a 3TB drive failed, I would remove it, and leave its partner in the case (but unused), and put in a new 6TB. If another 3 TB drive failed, I could build a new 6TB logical device from the two surviving partners. Over time, the 3TB drives would fail out to be replaced by 6TB drives. In the mean time, it will be years before there's any danger of the Myth backup reaching close to 18 TB, so all the other computers in my home can use the unused NAS space for their own nightly backups.
So far, though, I have not figured out how to set up the RAID device as described above.
I understand that the simultaneous loss of any two drives spanning different logical devices (including loss of a drive during the rebuild) would result in loss of all data stored on the NAS, but I can accept that. MythTV files will still be stored on their box. Important personal files are already stored on 3 other physical drives, one of which is kept in a fireproof/waterproof safe.
So, how might I go about setting up my drives as described?
Thank you.
The impetus for setting up this system has been a MythTV box that was running low on space. It had three 3TB drives. My main desktop machine had 3 more 3TB drives for the backup of the media files. With the Myth box needing more space, and limited case space, I decided it was time to put 6TB drives in the Myth box. So, now I had 6 working 3TB drives that don't suit the purpose anymore. I bought one more 6 TB drive with the intention of setting up a RAID array like this:
logical device 1 : two 3TB drives striped into a single 6TB volume
logical device 2 : as above
logical device 3 : as above
logical device 4 : one 6TB drive
Then I would put these 4 logical devices into a single RAIDZ1 with a capacity of 18TB.
If a 3TB drive failed, I would remove it, and leave its partner in the case (but unused), and put in a new 6TB. If another 3 TB drive failed, I could build a new 6TB logical device from the two surviving partners. Over time, the 3TB drives would fail out to be replaced by 6TB drives. In the mean time, it will be years before there's any danger of the Myth backup reaching close to 18 TB, so all the other computers in my home can use the unused NAS space for their own nightly backups.
So far, though, I have not figured out how to set up the RAID device as described above.
I understand that the simultaneous loss of any two drives spanning different logical devices (including loss of a drive during the rebuild) would result in loss of all data stored on the NAS, but I can accept that. MythTV files will still be stored on their box. Important personal files are already stored on 3 other physical drives, one of which is kept in a fireproof/waterproof safe.
So, how might I go about setting up my drives as described?
Thank you.