Zfs

here is how to work with zfs on abacus

situation

zpool status
zfs get all

mount after reboot

zfs set mountpoint=/export/db2 db2 

when you put in a new disk

fdisk -l 

to see what is new

sudo zpool create -f /srv/db3 raidz2 /dev/sdaa  /dev/sdab  /dev/sdac  /dev/sdad  /dev/sdae  /dev/sdaf  /dev/sdag  /dev/sdah  /dev/sdai  /dev/sdaj  /dev/sdak  /dev/sdal  
sudo zpool add -f /srv/db3 raidz2  /dev/sdam  /dev/sdan  /dev/sdao  /dev/sdap  /dev/sdaq  /dev/sdar  /dev/sdas  /dev/sdat  /dev/sdau  /dev/sdav  /dev/sdaw  /dev/sdax

zfs unmount db3

zfs mount db3

latest

zpool create -f db3 raidz2  /dev/sdy /dev/sdz  /dev/sdaa  /dev/sdab  /dev/sdac  /dev/sdad  /dev/sdae  /dev/sdaf  /dev/sdag  /dev/sdah  /dev/sdai  /dev/sdaj
zpool add -f db3 raidz2 /dev/sdak  /dev/sdal  /dev/sdam  /dev/sdan  /dev/sdao  /dev/sdap  /dev/sdaq  /dev/sdar  /dev/sdas  /dev/sdat  /dev/sdau  /dev/sdav

zpool create -f db4 raidz2 /dev/sdax /dev/sday /dev/sdaz /dev/sdba  /dev/sdbb  /dev/sdbc  /dev/sdbd  /dev/sdbe  /dev/sdbf  /dev/sdbg  /dev/sdbh  /dev/sdbi 
zpool add -f db4 raidz2 /dev/sdbj /dev/sdbk /dev/sdbl /dev/sdbm /dev/sdbn /dev/sdbo /dev/sdbp /dev/sdbq /dev/sdbr /dev/sdbs /dev/sdbt /dev/sdbu

however, these are empty. :(

recovery from accidental pool destruction

umount /mnt /mnt2
mdadm -S /dev/md125/dev/md126/dev/md127

sfdisk -d /dev/sda < sda.sfdisk
sfdisk -d /dev/sdb < sdb.sfdisk
sfdisk /dev/sda < sdb.sfdisk

mdadm --detail /dev/md127
mdadm -A -R /dev/md127/dev/sdb2/dev/sda2
mdadm /dev/md127 -a /dev/sda2
mdadm --detail /dev/md127
echo check > /sys/block/md127/md/sync_action
cat /proc/mdstat

mdadm --detail /dev/md126
mdadm -A -R /dev/md126/dev/sdb3/dev/sda3
mdadm /dev/md126 -a /dev/sda3
mdadm --detail /dev/md126
echo check > /sys/block/md126/md/sync_action
cat /proc/mdstat

Also switched the bios to boot from hd2 instead of hd1 (or something)

• Recreate zpool with correct drives
• Point an instance photorec at each of the wiped drives set to recover files of the following types: .gz, .solv (custom definition)