Op Mon, 16 May 2016 01:05:24 +0200, schreef Kai Krakow: > Am Sun, 15 May 2016 21:11:11 +0000 (UTC) > schrieb Duncan <1i5t5.dun...@cox.net>: > >> Ferry Toth posted on Sun, 15 May 2016 12:12:09 +0000 as excerpted: >> <snip> > > You can go there with only one additional HDD as temporary storage. Just > connect it, format as bcache, then do a "btrfs dev replace". Now wipe > that "free" HDD (use wipefs), format as bcache, then... well, you get > the point. At the last step, remove the remaining HDD. Now add your > SSDs, format as caching device, and attach each individual HDD backing > bcache to each SSD caching bcache. > > Devices don't need to be formatted and created at the same time. I'd > also recommend to add all SSDs only in the last step to not wear them > early with writes during device replacement. > > If you want, you can add one additional step to get the temporary hard > disk back. But why not simply replace the oldest hard disk with the > newest. Take a look at smartctl to see which is the best candidate. > > I went a similar route but without one extra HDD. I had three HDDs in > mraid1/draid0 and enough spare space. I just removed one HDD, prepared > it for bcache, then added it back and removed the next. > That's what I mean, a lot of work. And it's still a cache, with unnecessary copying from the ssd to the hdd.
And what happens when either a hdd or ssd starts failing? > -- > Regards, > Kai > > Replies to list-only preferred. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
