From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.com>
Subject: Re: Linear device of two arrays
Date: Fri, 14 Jul 2017 12:05:25 +1000
Message-ID: <87iniv22oq.fsf@notabene.neil.brown.name>
References: <CALee7hZYgLNO2siDJNtFge_BoocTXX-9BSgRHmMJH8MaH6V3LA@mail.gmail.com> <20170705214250.0ea99538@natsu> <595D2ADA.8010907@youngman.org.uk> <CALee7hZqmLK19tSEEFBgSWMKm9TRoUqLBCxUmbNJpwmM45BjTQ@mail.gmail.com> <df053262-9334-1070-c24a-5d2f91402716@hardwarefreak.org> <CALee7haowPD0DKPtEQUN8M8LDCNOq62SDrk5VNMO5C+5iUqtrQ@mail.gmail.com> <5afd5cea-06b8-8524-e4f5-8534f23bd714@hardwarefreak.org> <87van15j9b.fsf@notabene.neil.brown.name> <e394625b-18d7-d141-3957-3c16c9bc6e44@gmail.com> <87o9sn232n.fsf@notabene.neil.brown.name>
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On Fri, Jul 14 2017, NeilBrown wrote:
>
> Now create the linear from /dev/md2 and /dev/md3(?).  Be sure to use
> "-e 1.0 --data-offset=0".  This creates /dev/md4

I meant to add:
 if you want the linear device to align with raid10 stripes (which seems
 elegant, and might slightly help performance is rare cases) you can use
 the "--rounding" mdadm option.  e.g.
   mdadm --create /dev/md4 -l linear --rounding=1M -e 1.0  --data-offset=0 .....

NeilBrown

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