On Sun, Feb 27 at 10:06, Edward Ned Harvey wrote:
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 this will depend a lot on the enclosure itself, not all
enclosures are cheap pieces of doo-doo.
I think you should consider the possibility of upgrading the size of your
internal disks before adding external disks.
If space is generally available in the chassis, sure, but I don't see
*that* much difference between 4 internal controller cards in a
Thumper versus 4 controller cards talking to direct-attached SAS
JBODs. If you do it right, while your chances of any single hardware
failure occurring goes up with the # of components in the whole
system, your probability of a failure taking you offline should be <=
the unified solution.
--
Eric D. Mudama
edmud...@bounceswoosh.org
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