>
> What's mdadm -E /dev/sda[15] say?
> Maybe one was made with an older version that wanted less metadata space
> available.
>

i think that's a bingo, thot the manual said 1.2 was the default, looks
like i got 1.1:
>/dev/sda1:
>          Magic : a92b4efc
>        Version : 1.2
>    Feature Map : 0x0
>     Array UUID : 876bf64c:4d7241fc:8f52b636:93d0f6d9
>           Name : pecan:swap
>  Creation Time : Fri Nov 10 10:34:52 2017
>     Raid Level : raid1
>   Raid Devices : 2
>
> Avail Dev Size : 18696192 (8.92 GiB 9.57 GB)
>     Array Size : 9348096 (8.92 GiB 9.57 GB)
>    Data Offset : 16384 sectors
>   Super Offset : 8 sectors
>   Unused Space : before=16232 sectors, after=0 sectors
>          State : clean
>    Device UUID : 46b2904c:91504af9:04058ab0:d77b63b4
>
>    Update Time : Sat Jan 12 03:52:25 2019
>  Bad Block Log : 512 entries available at offset 136 sectors
>       Checksum : 3ef443bc - correct
>         Events : 248
>
>   Device Role : Active device 0
>   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
>/dev/sda5:
>          Magic : a92b4efc
>        Version : 1.1
>    Feature Map : 0x1
>     Array UUID : 06c21caa:36ecbc16:068a90ec:9ceba74e
>           Name : pecan.fo4.net:16  (local to host pecan.fo4.net)
>  Creation Time : Mon May 13 13:52:59 2013
>     Raid Level : raid1
>   Raid Devices : 2
>
> Avail Dev Size : 956761973 (456.22 GiB 489.86 GB)
>     Array Size : 478380800 (456.22 GiB 489.86 GB)
>  Used Dev Size : 956761600 (456.22 GiB 489.86 GB)
>    Data Offset : 262144 sectors
>   Super Offset : 0 sectors
>   Unused Space : before=262072 sectors, after=373 sectors
>          State : clean
>    Device UUID : 1e4613e7:1e42061a:ac9e2062:88c4985e
>
>Internal Bitmap : 8 sectors from superblock
>    Update Time : Fri Jan 11 18:52:48 2019
>       Checksum : f31b0089 - correct
>         Events : 206597\
>
>   Device Role : Active device 0
>   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
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