I create a mirrored zpool equivalent to a RAID1 array zfsbuild website, but i create the pool with one device connected via usb hdd docking stattion.
Later on i connect the device directly on my bus sata on my workstation, so i have to remove the device from pool. To do this i detach the old device name from pool and attach the new one. oracle attach and detach
1. Take offline the device
Take the device offline starting with “usb-WDC_WD15_EARS”, since it does not exit anymore !
~# zpool offline tank usb-WDC_WD15_EARS-00MVWB0_DCAA46930898-0:0-part4
2. Try to remove device from pool
If you try to remove the device from pool it will fail !
~# zpool remove tank usb-WDC_WD15_EARS-00MVWB0_DCAA46930898-0:0-part4 cannot remove usb-WDC_WD15_EARS-00MVWB0_DCAA46930898-0:0-part4: only inactive hot spares, cache, top-level, or log devices can be removed ~# zpool status pool: tank state: DEGRADED status: One or more devices has been taken offline by the administrator. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Online the device using 'zpool online' or replace the device with 'zpool replace'. scan: none requested config: NAME STATE READ WRITE CKSUM tank DEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 ata-WDC_WD30EFRX-68AX9N0_WD-WMC1T0093794-part4 ONLINE 0 0 0 usb-WDC_WD15_EARS-00MVWB0_DCAA46930898-0:0-part4 OFFLINE 0 0 0
3. Detach the device from pool
You can use the zpool detach command to detach a device from a mirrored storage pool.
~# zpool detach tank usb-WDC_WD15_EARS-00MVWB0_DCAA46930898-0:0-part4 ~# zpool status pool: tank state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 ata-WDC_WD30EFRX-68AX9N0_WD-WMC1T0093794-part4 ONLINE 0 0 0
4. Find the id of the new device
Find the id of the new device to add to the pool, in our case start’s with “ata-WDC_WD15EARS”
~# ls -la /dev/disk/by-id/ | grep sdc4 lrwxrwxrwx 1 root root 10 Jan 15 11:39 ata-WDC_WD15EARS-00MVWB0_WD-WCAZA4693089-part4 -> ../../sdc4
5. Attach the new device to pool
Attach the new device to pool and after that you have a two-way mirrored storage pool ;-)
~# zpool attach tank ata-WDC_WD30EFRX-68AX9N0_WD-WMC1T0093794-part4 ata-WDC_WD15EARS-00MVWB0_WD-WCAZA4693089-part4 ~# root@terrance /h/r/S/g/a/howto# zpool status pool: tank state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Fri Jan 15 14:24:43 2016 254M scanned out of 196G at 31.7M/s, 1h45m to go 253M resilvered, 0.13% done config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ata-WDC_WD30EFRX-68AX9N0_WD-WMC1T0093794-part4 ONLINE 0 0 0 ata-WDC_WD15EARS-00MVWB0_WD-WCAZA4693089-part4 ONLINE 0 0 0 (resilvering)