Reconnecting removed HDD after system rebuild

[Dologan]

I would like to move the system volume on my TS-230 NAS from an HDD-based storage pool to one located on an SSD. My hope is that this would allow the HDD to properly go into standby when the NAS is idle, since this doesn't seem to ever happen currently, due to it being host to all sort of continuous system background processes, I presume.

From what I gather, there is no simple "clean" way of moving an active system volume to another, and that the only way for this to happen is if it becomes unavailable, at which point the next available volume would become the system one (whichever one that may be). It occurred to me that I could force my SSD volume to become the system one by temporarily unplugging the HDD from the NAS, but it seems that all this does initially is to mark the original storage pool as "Error", with no obvious way of "regenerating" the system volume without removing the "faulty" pool first.

My question is, if I remove the storage pool from the OS in order to force the transfer onto the only other available pool (the SSD), what would happen when I reconnect the missing drive? Will the OS be able to recover and remount the data on it somehow, or would the HDD be now unrecognizable and get forced to reformat it?

[dolbyman]

No..that won't help..the OS is on all drives and log writes will keep the drives all active