On Mon, Jan 25, 2016 at 9:43 AM, Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx> wrote: > Now, just a general caution: Avoid using USB storage for persistent online > storage, there's just to many things that can go wrong, and quite a few USB > storage controllers are absolute crap. Yes. Lately, USB 3 stuff is better in that the speeds are approaching rocket science, so if the manufacturer doesn't get it right, things rapidly implode. But as far as getting useful error messages and such, it's almost like the state of networking 20 years ago. You just had to follow the rules and swap stuff out if it wasn't working. Error codes might mean something to a developer but they're useless for mortal users. I really think USB hubs help fix a lot of USB related problems, even when it's not a power related problem. Currently I'm using internal SATA in a NUC for the primary storage, but use send/receive to two separate raid1 volumes that are USB drives. I can balance/scrub, and read/write to any and all drives with no problems since getting a dyconn "industrial" (probably a design term, it's aluminum not plastic) hub. Before that, one drive or another would just intermittently reset, usually to no ill effect, but once it wigged out, vanished, and reappeared as a completely different /dev/sdx device. The enclosures are crap, the manufacturer (ASMedia Technology Inc.) didn't bother to fully populate all of the USB descriptors and it doesn't pass through physical sector size properly, or report max power correctly, etc. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
