>> I am thinking about adding an external Case with 4
haddrives to my
>> server that should not be running 247. In ancient
times this was done
>> via SCSI and simply worked (turn on, rescan SCSI,
mount).
I suppose you could still use SCSI today if you don't mind
paying
$C$I price$.
If the only reason for wanting an external box is the
ability to
power the drives down, you could make a custom power cable
with a
switch inline. There are panels with switches that fit
standard
3.5" bays, so you don't have to do any metalwork, just
a little
soldering.
If an additional SATA drive appears, does the FreeBSD kernel
notice
and handle it (like USB) ? Is a rescan needed (like SCSI) ?
A reboot?
>> I already have an external drive connected via USB,
but I am not able to
>> read SMART using this link.
Another issue with the USB bridges is you can't turn the
disk's write
cache on and off. :-(
Do firewire bridges allow access to the write cache control
bit, and SMART data?
How is FreeBSD support for firewire disks?
> I did something similar with an Addonics 4-drive
housing and a SiI 3124 based
> SATA controller. That meant writing some of the driver
for the 3124, but it
> was fun (and the Soren did the heavy lifting).
Does this mean that the SiI 3124 device driver is working?
Is it
"ready for prime time"? I've been watching
-hardware and -drivers but
haven't seen anything.
> I don't think PM is supported yet. Certainly not in
6-STABLE, possibly in 7.
> I remember Soren was delaying PM work until NCQ was
in;
So NCQ isn't ready yet? :-(
Are there *any* controllers with working NCQ support?
> I had PM support
> without NCQ in 6-STABLE at one point, but that severely
limits the total
> throughput of the drives.
I would think that SATA-300 could support 4 drives without
slowing them
down, is there some other bottleneck?
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