Expand 2x1TB Raid 1 to 2x4TB Raid 1

[rv10947]

I currently have 2x 1TB disks running in Raid1. The other two slots are running in Raid0, so all bays are full. 

I want to expand my Raid1 capacity to 4 TB, so I bought 2x 4TB disks. Can I just take the 1TB disk out whilst running and replace it with a 4TB one. Wait for resync and then repeat this step with the other one?

[rv10947 · Accepted solution]

So I found the solution and it's pretty easy. I just hot swapped a 1TB disk for a 4TB. Data will resync automatically. And then after repair of data I did the same thing again. After the second repair it showed 4TB of total capacity automatically. Great!

[StephenB]

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@rv10947 wrote:

Can I just take the 1TB disk out whilst running and replace it with a 4TB one. Wait for resync and then repeat this step with the other one?

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Yes, that is what you need to do to start.

Since you are running FlexRaid you'll need to then create a new RAID-1 group to use the extra space and concatenate it to the existing volume.

[Sandshark]

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@StephenB wrote:

Since you are running FlexRaid you'll need to then create a new RAID-1 group to use the extra space and concatenate it to the existing volume.

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Please report back if this works.  Maybe it's because I have a 12-bay legacy system converted to OS6 or because I didn't replace all the drives with larger ones, but I have not found a way to do that other than "under the hood" via SSH.

[StephenB]

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@Sandshark wrote:

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@StephenB wrote:

Since you are running FlexRaid you'll need to then create a new RAID-1 group to use the extra space and concatenate it to the existing volume.

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Please report back if this works.  Maybe it's because I have a 12-bay legacy system converted to OS6 or because I didn't replace all the drives with larger ones, but I have not found a way to do that other than "under the hood" via SSH.

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If it doesn't work, you'll need to back up the volume, destroy it, create a new one (recreating any shares), and then restore the files from the backup.

Or attempt to expand the volume with ssh.

[Sandshark]

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@StephenB wrote:

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Or attempt to expand the volume with ssh.

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If you end up going this way, see my post How-to-do-incremental-vertical-expansion-in-FlexRAID-mode .  Though I wrote it for incremental expansion, it will work for a full volume expansion as well.

[rv10947 · Accepted solution]

So I found the solution and it's pretty easy. I just hot swapped a 1TB disk for a 4TB. Data will resync automatically. And then after repair of data I did the same thing again. After the second repair it showed 4TB of total capacity automatically. Great!