Softraid on OpenBSD

root@puffy # dmesg |grep -i sec

wd0: 64-sector PIO, LBA, 20480MB, 41943040 sectors
sd0: 20480MB, 512 bytes/sector, 41943040 sectors
sd1: 20480MB, 512 bytes/sector, 41943040 sectors
sd2: 20480MB, 512 bytes/sector, 41943040 sectors

fdisk -gy sd0
fdisk -gy sd1
fdisk -gy sd2

root@puffy # disklabel -E sd0

Label editor (enter '?' for help at any prompt)
sd0> a
partition: [a]
offset: [64]
size: [41942943]
FS type: [4.2BSD] raid
sd0*> w
sd0> q
No label changes.

disklabel sd0 > disklabel.sd0.softraid
disklabel -R sd1 disklabel.sd0.softraid
disklabel -R sd2 disklabel.sd0.softraid

root@puffy # bioctl -c 5 -l sd0a,sd1a,sd2a softraid0

softraid0: RAID 5 volume attached as sd3

root@puffy # dd if=/dev/zero bs=1m count=1 of=/dev/sd3c

1+0 records in
1+0 records out
1048576 bytes transferred in 0.068 secs (15227879 bytes/sec)

root@puffy # fdisk -gy sd3
Writing GPT.
# disklabel -E sd3

Label editor (enter '?' for help at any prompt)
sd3> a
partition: [a]
offset: [64]
size: [83884703]
FS type: [4.2BSD]
sd3*> w
sd3> q
No label changes.

root@puffy # newfs sd3a
/dev/rsd3a: 40959.3MB in 83884672 sectors of 512 bytes
203 cylinder groups of 202.50MB, 12960 blocks, 25920 inodes each
super-block backups (for fsck -b #) at:
 160, 414880, 829600, 1244320, 1659040, 2073760, 2488480, 2903200, 3317920, 3732640, 4147360, 4562080, 4976800, 5391520,
 5806240, 6220960, 6635680, 7050400, 7465120, 7879840, 8294560, 8709280, 9124000, 9538720, 9953440, 10368160, 10782880,
 11197600, 11612320, 12027040, 12441760, 12856480, 13271200, 13685920, 14100640, 14515360, 14930080, 15344800, 15759520,
 16174240, 16588960, 17003680, 17418400, 17833120, 18247840, 18662560, 19077280, 19492000, 19906720, 20321440, 20736160,
 21150880, 21565600, 21980320, 22395040, 22809760, 23224480, 23639200, 24053920, 24468640, 24883360, 25298080, 25712800,
 26127520, 26542240, 26956960, 27371680, 27786400, 28201120, 28615840, 29030560, 29445280, 29860000, 30274720, 30689440,
 31104160, 31518880, 31933600, 32348320, 32763040, 33177760, 33592480, 34007200, 34421920, 34836640, 35251360, 35666080,
 36080800, 36495520, 36910240, 37324960, 37739680, 38154400, 38569120, 38983840, 39398560, 39813280, 40228000, 40642720,
 41057440, 41472160, 41886880, 42301600, 42716320, 43131040, 43545760, 43960480, 44375200, 44789920, 45204640, 45619360,
 46034080, 46448800, 46863520, 47278240, 47692960, 48107680, 48522400, 48937120, 49351840, 49766560, 50181280, 50596000,
 51010720, 51425440, 51840160, 52254880, 52669600, 53084320, 53499040, 53913760, 54328480, 54743200, 55157920, 55572640,
 55987360, 56402080, 56816800, 57231520, 57646240, 58060960, 58475680, 58890400, 59305120, 59719840, 60134560, 60549280,
 60964000, 61378720, 61793440, 62208160, 62622880, 63037600, 63452320, 63867040, 64281760, 64696480, 65111200, 65525920,
 65940640, 66355360, 66770080, 67184800, 67599520, 68014240, 68428960, 68843680, 69258400, 69673120, 70087840, 70502560,
 70917280, 71332000, 71746720, 72161440, 72576160, 72990880, 73405600, 73820320, 74235040, 74649760, 75064480, 75479200,
 75893920, 76308640, 76723360, 77138080, 77552800, 77967520, 78382240, 78796960, 79211680, 79626400, 80041120, 80455840,
 80870560, 81285280, 81700000, 82114720, 82529440, 82944160, 83358880, 83773600,

root@puffy # mkdir /raid
root@puffy # mount /dev/sd3a /raid

echo "/dev/$(bioctl softraid0 |awk '/softraid0/{ print $5 }')a /raid ffs rw,softdep,noatime,nodev,nosuid 1 2" >> /etc/fstab

root@puffy # df -h
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/wd0a      600M    224M    346M    39%    /
/dev/wd0l      3.7G   63.7M    3.4G     2%    /home
/dev/wd0d      848M    1.7M    804M     0%    /tmp
/dev/wd0f      2.3G    1.2G    1.0G    54%    /usr
/dev/wd0g      643M    271M    339M    44%    /usr/X11R6
/dev/wd0h      2.3G    1.7G    493M    78%    /usr/local
/dev/wd0k      5.2G    2.0K    4.9G     0%    /usr/obj
/dev/wd0j      1.6G    2.0K    1.5G     0%    /usr/src
/dev/wd0e      1.2G   49.8M    1.1G     4%    /var
/dev/sd3a     38.7G    2.0K   36.8G     0%    /raid

root@puffy # tar czf /raid/all.tar.gz / &

root@puffy # df -h /raid/;
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/sd3a     38.7G    2.2G   34.6G     6%    /raid

root@puffy# ls -al /raid/
drwxr-xr-x   2 root  wheel         512 Feb  4 11:18 .
drwxr-xr-x  14 root  wheel         512 Feb  4 11:18 ..
-rw-r--r--   1 root  wheel  2374055353 Feb  4 11:22 all.tar.gz

root@puffy 130 # bioctl softraid0
Volume      Status               Size Device
softraid0 0 Online        42949017600 sd3     RAID5
          0 Online        21474516480 0:0.0   noencl <sd0a>
          1 Online        21474516480 0:1.0   noencl <sd1a>
          2 Online        21474516480 0:2.0   noencl <sd2a>

root@puffy # dmesg |grep -i sect
wd0: 64-sector PIO, LBA, 20480MB, 41943040 sectors
sd0: 20480MB, 512 bytes/sector, 41943040 sectors
sd1: 20480MB, 512 bytes/sector, 41943040 sectors
sd2: 30720MB, 512 bytes/sector, 62914560 sectors
sd3: 40959MB, 512 bytes/sector, 83884800 sectors

root@puffy # bioctl softraid0
Volume      Status               Size Device
softraid0 0 Degraded      42949017600 sd3     RAID5
          0 Online        21474516480 0:0.0   noencl <sd0a>
          1 Offline                 0 0:1.0   noencl <>
          2 Online        21474516480 0:2.0   noencl <sd1a>

root@puffy # ll /raid/
total 4639136
-rw-r--r--  1 root  wheel  2374055353 Feb  4 11:22 all.tar.gz

root@puffy # bioctl -R /dev/sd2a sd3
softraid0: sd2a partition too large, wasting 10737418240 bytes
softraid0: rebuild of sd3 started on sd2a

root@puffy # bioctl sd3
Volume      Status               Size Device
softraid0 0 Rebuild       42949017600 sd3     RAID5 10% done
          0 Online        21474516480 0:0.0   noencl <sd0a>
          1 Rebuild       32211934720 0:1.0   noencl <sd2a>
          2 Online        21474516480 0:2.0   noencl <sd1a>

softraid0: volume sd4 is roaming, it used to be sd3, updating metadata