Subject: Re: Useability of NFS over USB disks
To: None <current-users@NetBSD.org>
From: Peter Seebach <firstname.lastname@example.org>
Date: 09/19/2006 23:15:38
In message <20060920040711.GS10133@mewburn.net>, Luke Mewburn writes:
>My experience with external USB storage leads me to recommend
>against using it for production use.
> * They don't handle errors in a graceful manner; a bad block
> on the IDE disk can result in the process accessing the block
> getting stuck in disk wait for a long period of time.
I would replace "can result" with "nearly always results".
> Fortunately, I can generally recover from lock-ups
> by disconnecting the USB cable; the kernel detaches the
> devices and the process exits.
Most often. Of course, that's not a particularly elegant solution, and
if you're on -current, it'll panic some weeks.
> * You can't access the SMART data on the IDE disk, since they
> present the disk as a fairly "dumb" SCSI disk.
> * Performance is generally "OK" for raw throughput (25MiB/s),
> contrasted with the native (45-60MiB/s).
Yeah. I'm on USB1, making it even worse.
>I've considered using IEEE1394<->IDE, but the support for that in
>NetBSD isn't production quality.
Tragically, no. And I really wish it'd get fixed, because I have a real use
for it, but I don't think I have the competence.