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h2. How to Create a Mirrored ZFS Storage Pool

The OpenSolaris installer creates a ZFS storage pool, which is a pool of devices that all the file systems in that pool share.

If you have an additional disk that is the same size as the disk in the ZFS storage pool that was created during the OpenSolaris installation, you might consider creating a two-disk mirrored ZFS storage pool. A two-disk mirrored pool provides better data protection against a disk failure.

*Tip* \- For general recommendations about ZFS storage pools, go to http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide.


h5. Steps

# {include:root_step}
# *Identify your existing storage pool devices.*
For example:
{code}
# zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:

NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c4d0s0 ONLINE 0 0 0

errors: No known data errors
{code}
# *Attach a second disk as a mirror to the existing storage pool device.*
For example:
{code}
# zpool attach rpool c4d0s0 c4d1s0
{code}
# *Verify that the device is attached.*
For example:
{code}
# zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:

NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror ONLINE 0 0 0
c4d0s0 ONLINE 0 0 0
c4d1s0 ONLINE 0 0 0

errors: No known data errors
{code}
# *Apply the boot blocks to the newly attached disk.*
For example:
{code}
# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c4d1s0
{code}
# *Confirm that you can boot from the newly attached disk by selecting this disk from the BIOS level.*

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