> Thus, if you have a 2GB, a 3GB, and a 5GB device in a pool,
> the pool's capacity is 3 x 2GB = 6GB
If you put the three into one raidz vdev it will be 2+2
until you replace the 2G disk with a 5G at which point
it will be 3+3 and then when you replace the 3G with a 5G
it will be 5+5G. and if you replace the 5G with a 10G
it will still be 5+5G
If one lists out the three disks so they are all their own
vdevs it will be 3x faster than the raidz and 3+2+5 in size
(see example below of mirrors and raidz vdevs of different sizes)
> All pools store redundant metadata, so they can
> automatically detect and repair most faults in metadata.
and one can `zfs set copys=2 pool/home` with the 2+3+5
stripe to automatically detect and repair most faults in data
as there is an "attempt" to store files on different vdevs
(mirrors are best)
7 % zpool iostat -v
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
root 15.9G 100G 2 0 177K 800
c2t0d0s7 15.9G 100G 2 0 177K 800
---------- ----- ----- ----- ----- ----- -----
z 3.28T 1.59T 379 19 26.6M 103K
raidz1 1.83T 1.58T 207 12 14.9M 64.7K
c0t2d0 - - 69 6 3.84M 17.1K
c4t1d0 - - 69 6 3.84M 17.1K
c0t6d0 - - 69 6 3.84M 17.1K
c0t4d0 - - 69 6 3.84M 17.1K
c4t3d0 - - 69 6 3.84M 17.1K
raidz1 1.44T 12.0G 172 7 11.7M 37.9K
c4t4d0 - - 58 5 3.06M 10.2K
c4t6d0 - - 58 5 3.06M 10.2K
c0t3d0 - - 58 5 3.06M 10.2K
c4t2d0 - - 58 5 3.06M 10.2K
c0t5d0 - - 58 5 3.06M 10.2K
---------- ----- ----- ----- ----- ----- -----
1 % zpool iostat -v
capacity operations bandwidth
pool used avail read write read write
------------ ----- ----- ----- ----- ----- -----
root 5.28G 24.0G 0 0 863 2.13K
mirror 5.28G 24.0G 0 0 863 2.13K
c0t1d0s0 - - 0 0 297 4.76K
c0t0d0s0 - - 0 0 597 4.76K
------------ ----- ----- ----- ----- ----- -----
z 230G 500G 17 76 150K 461K
mirror 83.8G 182G 6 25 52.1K 158K
c0t0d0s7 - - 2 15 85.1K 248K
c0t1d0s7 - - 2 15 86.7K 248K
mirror 72.6G 159G 5 26 49.4K 161K
c0t2d0 - - 2 19 82.7K 251K
c0t3d0 - - 2 19 81.2K 251K
mirror 74.0G 158G 5 23 48.3K 142K
c0t4d0 - - 2 18 72.3K 232K
c0t5d0 - - 2 18 71.9K 232K
------------ ----- ----- ----- ----- ----- -----
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