So I created my zpool with this command:
zpool create -o ashift=12 vault raidz2
/dev/disk/by-id/ata-ST8000NE0021-2EN112_ZA15WTS6
/dev/disk/by-id/ata-ST8000NE0021-2EN112_ZA1654W8
/dev/disk/by-id/ata-ST8000VN0022-2EL112_ZA10D0AW
/dev/disk/by-id/ata-ST8000VN0022-2EL112_ZA15J0LG
/dev/disk/by-id/ata-ST8000VN0022-2EL112_ZA18JD9F
/dev/disk/by-id/ata-ST8000VN0022-2EL112_ZA1A8RP0
/dev/disk/by-id/ata-WDC_WD80EFAX-68KNBN0_VAH1ZYPL
/dev/disk/by-id/ata-WDC_WD80EFAX-68KNBN0_VAHZDX7L
/dev/disk/by-id/ata-WDC_WD80EFAX-68KNBN0_VAJ7DYBL
Now I have moved all my data across to this pool. I want to extend the size of the pool with more drives from the old server. Its a matching 9 pair, I was going to use:
zpool add -o ashift=12 vault raidz2
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAGTMG3L
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAGZ6M7L
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAHAMJ5L
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAHAUVSL
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAHEU2VL
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAHZ1NDL
/dev/disk/by-id/WDC_WD80EFAX-68KNBN0_VAJ7EV5L
/dev/disk/by-id/WDC_WD80EFAX-68LHPN0_7HKUL9LN
/dev/disk/by-id/WDC_WD80EFAX-68LHPN0_7SJ75XKW
Is this the right way? Especially to keep the ashift=12?