In my experience, one USB stick usually works OK.
Multiple USB sticks all accessed together, and you usually find the
transport to all of them goes up and down like a yoyo, as though
something was getting the threading of the connections across USB
screwed up. (This is a shame because I'd love to use it to mock up a
storage array for ZFS demos.)
IIRC, this issue started with a new USB framework early in Solaris 10,
and is still like that in current Solaris 11.
USB disks can work better than USB sticks, but I haven't ever tried a
direct substitution in the same environment where USB sticks fail, so I
don't know if that's universally true.
Some USB sticks have only limited command support. If you get hangs when
trying to use only one USB stick at a time, add the following to
/kernel/drv/scsa2usb.conf:
attribute-override-list="vid=* reduced-cmd-support=true";
and then "update_drv -f scsa2usb" (or reboot). However, this does
nothing to fix the multiple USB sticks issue above. (You can make this
option selective for specific USB stick models only - see the comments
in the file.)
On 28/03/2014 15:04, Michael Stapleton wrote:
I'm not sure when things changed, but way back in the OpenSolaris days,
I had the root drive in my laptop mirrored to an external USB drive.
I never had problems back then. I would do a demonstration where I would
remove the USB drive while the laptop was up and running, and then plug
the USB submirror into another laptop and boot from it.
Never had a problem. I could even reattach the USB drive to my laptop
and it would resilver automatically.
Is the problem ZFS or USB or FMA? no idea. But the was a regression of
sorts.
I don't think Solaris11 suffers from this.
Mike
--
Andrew Gabriel
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