> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Brandon High
> 
> I would avoid USB, since it can be less reliable than other connection
> methods. That's the impression I get from older posts made by Sun

Take that a step further.  Anything external is unreliable.  I have used
USB, eSATA, and Firewire external devices.  They all work.  The only
question is for how long.  

If it's external, you've got yet another controller on the motherboard (or
PCIe) being used...  Yet another data circuit being used inside the external
enclosure....  Now in addition to your internal power supply, you've got an
external power supply.  With power & data wires that can be bumped or
knocked off a shelf...  

The system is up 24/7, and external enclosures aren't well built for that
type of usage.  If it's all internal it's all enclosed and it's all securely
attached and built to stay on 24/7.  With fewer circuits involved to
possibly fail.

I think you should consider the possibility of upgrading the size of your
internal disks before adding external disks.

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