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This chapter is from the book

This chapter is from the book

2.4 Creating a Pool with RAID-Z Devices

In ZFS you can also create redundant vdevs similar to RAID-5, called RAID-Z. To create a pool with double parity, you would use RAID-Z2 instead.

The following command line will create a ZFS pool named rzpool with two RAID-Z1 vdevs, each with four disks:

# zpool create rzpool raidz1 c5t6d0 c5t7d0 c5t8d0 c5t9d0 raidz1

   c5t10d0 c5t11d0 c5t12d0 c5t13d0

The first RAID-Z1 vdev consists of disks c5t6d0, c5t7d0, c5t8d0, and c5t9d0, and the second RAID-Z1 vdev has c5t6d0, c5t7d0, c5t8d0, and c5t9d0 as members.

The zpool list command shows the summary status of the new pool rzpool. The output of zpool status, on lines 16 and 21, shows the RAID-Z1 virtual devices and physical disk devices that make up each RAID-Z1 virtual device.

1   # zpool create rzpool raidz1 c5t6d0 c5t7d0 c5t8d0 c5t9d0
raidz1 c5t10d0 c5t11d0 c5t12d0 c5t13d0
2   # zpool list
3   NAME      SIZE   USED  AVAIL    CAP  HEALTH  ALTROOT
4   dstripe   234M    75K   234M     0%  ONLINE  -
5   mpool     234M    78K   234M     0%  ONLINE  -
6   rpool    15.9G  3.21G  12.7G    20%  ONLINE  -
7   rzpool    936M   138K   936M     0%  ONLINE  -
8   # zpool status
    ...lines deleted...
9   pool: rzpool
10   state: ONLINE
11   scrub: none requested
12  config:
13
14          NAME         STATE     READ WRITE CKSUM
15          rzpool       ONLINE       0     0     0
16            raidz1     ONLINE       0     0     0
17              c5t6d0   ONLINE       0     0     0
18              c5t7d0   ONLINE       0     0     0
19              c5t8d0   ONLINE       0     0     0
20              c5t9d0   ONLINE       0     0     0
21            raidz1     ONLINE       0     0     0
22              c5t10d0  ONLINE       0     0     0
23              c5t11d0  ONLINE       0     0     0
24              c5t12d0  ONLINE       0     0     0
25              c5t13d0  ONLINE       0     0     0
26
27  errors: No known data errors

Figure 2.4 has two RAID-Z1 vdevs with four physical disks to each vdev. The vdevs are concatenated to form the ZFS pool rzpool.

Figure 2.4

Figure 2.4 Pool rzpool using two RAID-Z1 redundant vdevs

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