Converting from SHR (2 disks) to SHR (1 disk)

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sohocoke
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Converting from SHR (2 disks) to SHR (1 disk)

Unread post by sohocoke » Fri Jul 13, 2018 12:17 pm

While testing out configurations, I added a disk to an existing SHR storage pool with a single disk, expecting to be able to remove the new disk from the pool without issue.

When I eventually decided mirrored redundancy is not worth the electricity and wear-and-tear over monthly backup, I deactivated the new disk, and found that while I can access all the data on the volume after removing the 2nd disk, the volume and storage pool show up as 'degraded' since the disks are remembered to contain multiple disks. I'd like to return this to 'normal' status.

Is it possible to configure the storage pool back to be based on a single disk ('SHR with no data protection') without going through the trouble of cloning all the data and snapshots to a newly created volume?

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HarryPotter
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Re: Converting from SHR (2 disks) to SHR (1 disk)

Unread post by HarryPotter » Fri Jul 13, 2018 12:52 pm

sohocoke wrote:
Fri Jul 13, 2018 12:17 pm
Is it possible to configure the storage pool back to be based on a single disk ('SHR with no data protection') without going through the trouble of cloning all the data and snapshots to a newly created volume?
No, this is not possible.
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sohocoke
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Re: Converting from SHR (2 disks) to SHR (1 disk)

Unread post by sohocoke » Wed Aug 22, 2018 2:00 pm

For those who have a similar need, I was able to update my RAID volume with an `mdadm` command so it became one based on a single disk, after I disconnected 1 of the 2 disks:

Code: Select all

mdadm --grow /dev/md2 --raid-devices=1 --force

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