Date: Fri, 08 Aug 2014 06:53:33 -0500 From: Scott Bennett <bennett@sdf.org> To: Trond Endrest?l <Trond.Endrestol@fagskolen.gjovik.no>, freebsd-questions@freebsd.org Subject: Re: freebsd-questions Digest, Vol 531, Issue 6 Message-ID: <201408081153.s78BrXoX011819@sdf.org> In-Reply-To: <mailman.77.1407412801.42985.freebsd-questions@freebsd.org> References: <mailman.77.1407412801.42985.freebsd-questions@freebsd.org>
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On Thu, 7 Aug 2014 10:33:09 +0200 (CEST) Trond Endrest?l
<Trond.Endrestol@fagskolen.gjovik.no> wrote:
>On Thu, 7 Aug 2014 03:16-0500, Scott Bennett wrote:
>> On Wed, 6 Aug 2014 03:49:37 -0500 Andrew Berg
>> <aberg010@my.hennepintech.edu> wrote:
>> >On 2014.08.06 02:32, Scott Bennett wrote:
>> >>
>> >> [much deleted --SB]
>> >>
>> >> 2) How does one start or stop a pool?
>> >That depends on what you mean by 'start' and 'stop'. I am guessing by what you
>> >described that you mean 'import' and 'export'. I'm not sure how to prevent
>>
>> Oh. Okay. At least there is some way to accomplish the same thing.
>>
>> >automatic import for pools that were imported on the same system and not
>> >exported prior to shutdown, but I am sure it can be done. Resilvering does not
>>
>> Maybe someone else will say how it can be done.
>>
>> >mercilessly thrash disks; standard reads and writes are given higher priority
>> >in the scheduler than resilver and scrub operations.
>>
>> If two pools use different partitions on a drive and both pools are
>> rebuilding those partitions at the same time, then how could ZFS *not*
>> be hammering the drive?
>
>Why would you place multiple pools on the very same drives?
Because I need about 1/4 of my usable data space on those drives
to be encrypted and the other 3/4 to be unencrypted, I need (according
to another respondent) to build my raidzN pool from .eli components
and the rest from unencrypted components.
>
>The only real world example I can think of is having separately
>mirrored boot and root pools using the same drives.
See above.
>
>E.g., bootpool using ada0p2 and ada1p2 as its mirrors, and rootpool
>using adap0p3 and ada1p3 as its mirrors, with ada0p1 and ada1p1 being
>the gpt boot partitions, and possibly with swap partitions on ada0p4
>and ada1p4.
>
Those low-space-requiring uses are also good examples of why a
multiterabyte drive might need to be divided into different partitions
with only some of them dedicated to ZFS. I had hoped to put some small
partitions in between the large ones for other uses, too.
Scott Bennett, Comm. ASMELG, CFIAG
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