[OmniOS-discuss] LTS r151014 installation issue from USB stick

[Jim Klimov]

13 августа 2016 г. 12:59:52 CEST, Krzysztof Grzempa <grzempek at gmail.com> пишет:
>Correct me if I'm wrong..There is no way to setup raidz on rpool. Right
>?
>
>2016-08-10 14:37 GMT+02:00 Krzysztof Grzempa <grzempek at gmail.com>:
>
>> >If the card as advertised as USB 3.0 then it will be xHCI.  Only a
>> >card which is genuinely only USB 2.0/1.1 will work.  Even then, you
>> >might not be able to use, say, a USB keyboard in the BIOS when the
>> >keyboard is in the offboard card. That's the annoying thing in my
>> >setup-- if I want to interact with the BIOS, the keyboard must be in
>> >an onboard, xHCI port.  But when we get to the OS, it must be in the
>> >offboard card for it to work.
>>
>> It is adertised as USB2.0 on PCI-E. So i hope it will work.
>> http://www.znak.pl/index.php?prid=kontUSB20Del89135
>> The possible issue with keyboard is not bother me, as mostly i will
>manage
>> this box via ssh, having keyboard detached..
>> I will feedback with results
>>
>> Thanks a lot
>> Krzysztof
>>
>> 2016-08-05 18:21 GMT+02:00 Eric Sproul <eric.sproul at circonus.com>:
>>
>>> On Fri, Aug 5, 2016 at 12:14 PM, Krzysztof Grzempa
><grzempek at gmail.com>
>>> wrote:
>>> > Right, probably it is my case too. (lshw showed me xHCI bus on
>Debian).
>>> > Will this PCIE usb2.0 card work for me then ?
>>> > I'm lack of knowledge if PCIE usb card use UCHI/EHCI or XHCI.
>>>
>>> If the card as advertised as USB 3.0 then it will be xHCI.  Only a
>>> card which is genuinely only USB 2.0/1.1 will work.  Even then, you
>>> might not be able to use, say, a USB keyboard in the BIOS when the
>>> keyboard is in the offboard card. That's the annoying thing in my
>>> setup-- if I want to interact with the BIOS, the keyboard must be in
>>> an onboard, xHCI port.  But when we get to the OS, it must be in the
>>> offboard card for it to work.
>>>
>>> Eric
>>>
>>
>>
>
>
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You're right, this is currently not possible, at least not with the standard bootloader and respective failsafes in zfs libraries that forbid unsupported setups for the rpool.

If you have a limited amount of disk bays, you can technically mix a mirrored rpool on small first partition (or slice) and a raidz pool on slices that cover the remainder of disk(s). With many enough disks (say 4+) you can make an rpool mirror on one couple of disks, and a mirror for swap (or on SSDs - perhaps a mirror for ZIL or two L2ARCs) on the other drives.

Note that while this sort of setup works for me for a decade, running several pools on same spindles may be suboptimal performance-wise and is generally not among recommended setups. Also when you use not-whole disks dedicated for the pools, but partitions or slices, you'd have to manage HDD-caching manually (e.g. with an init-script).

Hope this helps,
Jim
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