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A storage pool is a collection of devices that provides physical storage and data replica- tion for ZFS datasets. All datasets within a storage pool share the same space. See zfs 8 for information on managing datasets. This means that only the ZFS subcommands that do non write operations are permitted.
Permitted subcommands are list, iostat, status, online, offline, scrub, import, and history. To determine which version of ZFS is loaded readonly or writable: Virtual Devices vdevs A "virtual device" describes a single device or a collection of devices organized according to certain performance and fault characteristics.
The following virtual devices are supported: ZFS can use individual slices or partitions, though the recommended mode of operation is to use whole disks.
A whole disk can be speci- fied by omitting the slice or partition designation. When given a whole disk, ZFS automatically labels the disk, if necessary.
The use of files as a backing store is strongly discouraged. It is designed primarily for experimen- tal purposes, as the fault tolerance of a file is only as good as the file system of which it is a part.
A file must be specified by a full path. Data is replicated in an identical fashion across all components of a mirror. A mirror with N disks of size X can hold X bytes and can withstand N-1 devices failing before data integrity is compromised. Data and parity is striped across all disks within a raidz group.
A raidz group can have either single- or double-parity, mean- ing that the raidz group can sustain one or two failures respectively without losing any data.
The raidz1 vdev type specifies a single-parity raidz group and the raidz2 vdev type specifies a double-parity raidz group. The raidz vdev type is an alias for raidz1.
The minimum number of devices in a raidz group is one more than the num- ber of parity disks. The recommended number is between 3 and 9.
For more information, see the "Hot Spares" section.
Virtual devices cannot be nested, so a mirror or raidz virtual device can only contain files or disks. Mirrors of mirrors or other combina- tions are not allowed.
A pool can have any number of virtual devices at the top of the config- uration known as "root vdevs". Data is dynamically distributed across all top-level devices to balance data among devices.
As new virtual devices are added, ZFS automatically places data on the newly available devices. Virtual devices are specified one at a time on the command line, sepa- rated by whitespace.
The keywords "mirror" and "raidz" are used to dis- tinguish where a group ends and another begins. For example, the fol- lowing creates two root vdevs, each a mirror of two disks: All metadata and data is checksummed, and ZFS automat- ically repairs bad data from a good copy when corruption is detected.
In order to take advantage of these features, a pool must make use of some form of redundancy, using either mirrored or raidz groups. While ZFS supports running in a non-redundant configuration, where each root vdev is simply a disk or file, this is strongly discouraged.
A single case of bit corruption can render some or all of your data unavailable. An online pool has all devices operating nor- mally.
A degraded pool is one in which one or more devices have failed, but the data is still available due to a redundant configuration. A faulted pool has one or more failed devices, and there is insufficient redundancy to replicate the missing data.
Hot Spares ZFS allows devices to be associated with pools as "hot spares".This memeber is seeking prison pen pals. Write a prisoner from the Prison Inmates Online Directory.
Hi, I am running zpool iostat” and iostat” commands in two different terminals. When I look at the output of zpool, it shows no read/write but whereas when I see the iostat it shows 12 read iops ad 4 write iops.
Hey folks, I have a server in production that is running ZFS on Solaris this is an NFS head and the actual zpools are on a SAN.
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Documentation Home > Solaris ZFS Administration Guide > Chapter 11 ZFS Troubleshooting and Pool Recovery > Identifying Problems in ZFS > Reviewing zpool status Output Solaris ZFS Administration Guide Previous: Determining if Problems Exist in a ZFS Storage Pool.