[mythtv-users] Mirroring root partition on SSD to a hard drive -- bad idea?

[Jay Foster]

On 1/14/2016 2:34 PM, Craig Huff wrote:
> The narrative I'd seen was that SSDs are like light bulbs -- they work 
> and then they don't, and they don't last as long as HDs, but this was 
> all hearsay, which Gary reasonably questions. In my case, I'm using a 
> 128GB SanDisk that I got from Newegg awhile ago with the intent of 
> using it when I finally got off of MythBuntu 10.04/Myth 0.23.  Because 
> of the sudden failure storyline, I thought a mirror would be prudent, 
> but I had hoped that the HD wouldn't bog down the I/O performance -- 
> it would just take awhile to catch up with any backlog.
>
> The comments made so far have made me rethink that approach. Now I'm 
> kinda liking the idea of a daily anacron job to rsync the system to an 
> HD, or maybe better to "tar czf" and logrotate several day's worth so 
> I can backtrack until I get a working instance in case a problem isn't 
> immediately apparent. It'll take me a day or so to mull over all that 
> should be done, cobble up a script that looks solid, and give it a try 
> when the next multi-hour window of system inactivity opens (since I'd 
> have no idea how much time it would take until I try it). If trials 
> look practical, then I can add it to my daily housekeeping process 
> that runs once per day on shutdown.  If it takes awhile to run, I can 
> adjust the minimum-time-before-next-recording requirement to prevent 
> shutdowns that would not provide enough time to get the work done 
> before the next recording was supposed to start. If that time window 
> is too large, then I'll just have to think up another solution.
>
> Despite what one former supervisor asserted, there really is more than 
> one way to get something done and the most obvious isn't necessarily 
> the best, so I try to be open to other ideas. In that vein, please 
> feel free to poke holes in my revised plan of attack. ;-)
>
> --
> Craig.
>
>
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I would skip the mirroring approach and just make a regular backup. I 
use rdiff-backup and keep about one year's worth of backups.  I have a 
backup script that removes increments older than one year and then backs 
up the current system.  I used this on all of my linux systems.  I 
backup to a different machine.  I use rsync to mirror my myth video and 
myth music libraries.  This has come in handy a couple of times when 
migrating my myth video library to a larger drive.

I too have tried an SSD twice, and each time it died hard.  Each lasted 
about 1 year or less.  I will not purchase another SSD.  My experience 
is that good old rotating HDs are more reliable. Coincidentally, both 
SSDs died the same way doing the same thing (a mythbuntu update).

Jay


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