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Davis-A/raidz expansion

Last active November 10, 2023 20:00
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Someone in lobste.rs asked if you could expand a 4 disk raidz3 into a larger and larger pool. The answer is yes! https://lobste.rs/s/roqgoz/zfs_raidz_expansion_merged#c_rqtyqg
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raidz expansion
[root@devbox ~]# # --- zfs version ----
[root@devbox ~]# zfs version
zfs-2.2.99-0
zfs-kmod-2.2.99-0
[root@devbox ~]# # --- note: 2.2.99 is what you get if you build of master at the moment ---
[root@devbox ~]# # --- Create some disks ----
[root@devbox ~]# mkdir -p /root/zfs-sparse/
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d1.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d2.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d3.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d4.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d5.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d6.img
[root@devbox ~]# truncate -s 16GB /root/zfs-sparse/d7.img
[root@devbox ~]# # --- Create the pool ----
[root@devbox ~]# zpool create mypool raidz3 /root/zfs-sparse/d1.img /root/zfs-sparse/d2.img /root/zfs-sparse/d3.img /root/zfs-sparse/d4.img
[root@devbox ~]# zpool status
pool: mypool
state: ONLINE
config:
NAME STATE READ WRITE CKSUM
mypool ONLINE 0 0 0
raidz3-0 ONLINE 0 0 0
/root/zfs-sparse/d1.img ONLINE 0 0 0
/root/zfs-sparse/d2.img ONLINE 0 0 0
/root/zfs-sparse/d3.img ONLINE 0 0 0
/root/zfs-sparse/d4.img ONLINE 0 0 0
errors: No known data errors
[root@devbox ~]# # --- Expand the pool ----
[root@devbox ~]# zpool attach mypool raidz3-0 /root/zfs-sparse/d5.img
[root@devbox ~]# zpool status
pool: mypool
state: ONLINE
scan: scrub repaired 0B in 00:00:00 with 0 errors on Thu Nov 9 23:13:59 2023
expand: expanded raidz3-0 copied 952K in 00:00:00, on Thu Nov 9 23:13:59 2023
config:
NAME STATE READ WRITE CKSUM
mypool ONLINE 0 0 0
raidz3-0 ONLINE 0 0 0
/root/zfs-sparse/d1.img ONLINE 0 0 0
/root/zfs-sparse/d2.img ONLINE 0 0 0
/root/zfs-sparse/d3.img ONLINE 0 0 0
/root/zfs-sparse/d4.img ONLINE 0 0 0
/root/zfs-sparse/d5.img ONLINE 0 0 0
errors: No known data errors
[root@devbox ~]# # --- Expand the pool again and again ----
[root@devbox ~]# zpool attach mypool raidz3-0 /root/zfs-sparse/d6.img
[root@devbox ~]# zpool attach mypool raidz3-0 /root/zfs-sparse/d7.img
[root@devbox ~]# zpool status
pool: mypool
state: ONLINE
scan: scrub repaired 0B in 00:00:00 with 0 errors on Thu Nov 9 23:16:42 2023
expand: expanded raidz3-0 copied 1.73M in 00:00:01, on Thu Nov 9 23:16:42 2023
config:
NAME STATE READ WRITE CKSUM
mypool ONLINE 0 0 0
raidz3-0 ONLINE 0 0 0
/root/zfs-sparse/d1.img ONLINE 0 0 0
/root/zfs-sparse/d2.img ONLINE 0 0 0
/root/zfs-sparse/d3.img ONLINE 0 0 0
/root/zfs-sparse/d4.img ONLINE 0 0 0
/root/zfs-sparse/d5.img ONLINE 0 0 0
/root/zfs-sparse/d6.img ONLINE 0 0 0
/root/zfs-sparse/d7.img ONLINE 0 0 0
errors: No known data errors
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