[mythtv-users] Moving recordings to a different physical drive

Dave Ulrick d-ulrick at comcast.net
Fri May 20 13:54:20 UTC 2022

On 5/19/22 6:31 PM, Dave Ulrick wrote:
> I've finished moving my recordings to the two new SSD drives. Your 
> temporary storage group suggestion worked out well. I moved all the 
> recordings while mythbackend was running. I didn't have any issues 
> with new recordings, I'd previously added one SSD drive which had 
> priority over the iSCSI LUN so no new recordings have been saved to 
> the LUN in over six months.
> Although the iSCSI LUN worked without issue, I feel better about 
> storing the recordings right on the backend's own storage.


I've discovered an "oops!" issue related to my moving the recordings 
from a 2 TB iSCSI LUN to two 1 TB SSDs.

Back when I had all of my MythTV recordings on a disk that was shared 
for other purposes, I set

Setup / Video / General / Auto-Expire / Extra Disk Space

to 200 GB and forgot about it. When I moved the recording files, I 
filled the new SSDs so that < 200 GB was free. I think this is why some 
older recordings seem to have gone away since I moved them.

I think the Extra Disk Space setting is per file system as opposed to 
per storage group. So, after I finished moving the files, the backend 
removed the oldest auto-expire recordings from each file system until 
the free space reached or exceeded 200 GB. Thankfully, I didn't lose any 
recordings that I really wanted to keep!

All of my new MythTV storage drives are dedicated for MythTV--no need to 
keep space free for other uses--so just now I dialed this setting back 
to 10 GB.

Summary: if you intend to set up new storage devices for MythTV, make 
sure you revisit the Extra Disk Space setting, and as you copy files to 
a new device make sure to leave the Extra Disk Space free.


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