>
> 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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