Zpool

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Attaching and Detaching Devices in a Storage Pool. Onlining and Offlining Devices in a Storage Pool. Archiving Snapshots and Root Pool Recovery. The following sections describe different scenarios for creating and destroying ZFS storage pools:. Creating and destroying pools is fast and easy. However, be cautious when performing these operations. Although checks are performed to prevent using devices known to be in use in a new pool, ZFS cannot always know when a device is already in use.

Zpool

Connect and share knowledge within a single location that is structured and easy to search. I use the latest ZFS on Linux 0. What is the correct way to resize the pool to the full 2. This is the current output of lsblk and zpool status :. As a first step, I would delete sdb5 and resize sdb4 via gdisk to 2. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more about Teams. Growing zpool in zfsonlinux Ask Question. Asked 7 years, 6 months ago. Modified 7 years, 6 months ago. Viewed 4k times. The pool can still be used, but some features are unavailable. Once this is done, the pool may no longer be accessible by software that does not support the features.

The following commands remove the mirrored log device mirror-2 and mirrored top-level data device mirror The following subcommands are supported:, zpool.

This article is the second part of the ZFS series of articles and this time we would like to focus on the concept of pooled storage and its component parts. ZFS pool Zpool is a collection of one or more virtual devices, referred to as vdevs that appear as a single storage device accessible to the file system. The Zpool is the highest container in the whole ZFS system. Note that after creating a Zpool, it may not be possible to add additional disks to the vdev due to the fact that most vdev types prohibit such an operation. Exceptions to this are mirrors where vdev can be equipped with additional disks. However, this operation increases only the security level of vdev.

ZFS is an advanced file system designed to solve major problems found in previous storage subsystem software. Data integrity: All data includes a checksum of the data. ZFS calculates checksums and writes them along with the data. When reading that data later, ZFS recalculates the checksums. If the checksums do not match, meaning detecting one or more data errors, ZFS will attempt to automatically correct errors when ditto-, mirror-, or parity-blocks are available. Pooled storage: adding physical storage devices to a pool, and allocating storage space from that shared pool. Space is available to all file systems and volumes, and increases by adding new storage devices to the pool. Performance: caching mechanisms provide increased performance.

Zpool

The zpool command configures ZFS storage pools. A storage pool is a collection of devices that provides physical storage and data replication for ZFS datasets. All datasets within a storage pool share the same space. See zfs 8 for information on managing datasets. 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:. A raidz group can have single-, double- , or triple parity, meaning that the raidz group can sustain one, two, or three failures, respectively, without losing any data.

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The zpool command configures ZFS storage pools. The following subcommands are supported: zpool -? You can use similar output on your system to identify the actual ZFS commands that were executed to troubleshoot an error condition. The following in-use checks serve as helpful warnings and can be overridden by using the -f option to create the pool: Contains a file system The disk contains a known file system, though it is not mounted and doesn't appear to be in use. The amount of physical space allocated to all datasets and internal metadata. This operation informs the underlying storage devices of all blocks in the pool which are no longer allocated and allows thinly provisioned devices to reclaim the space. Document Information Preface 1. Use zpool destroy with caution. Datasets can be nested. If one or more devices are unavailable, the pool can still be destroyed.

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Virtual devices and the physical devices that are contained in a ZFS storage pool are displayed with the zpool status command. Capacity and reads can be monitored using the iostat subcommand as follows:. To create a pool with a different default mount point, use the -m option of the zpool create command. The second mirror keyword indicates that a new top-level virtual device is being specified. Any performance improvement seen by implementing a separate log device depends on the device type, the hardware configuration of the pool, and the application workload. Adding another set of disks for an additional top-level virtual device to an existing RAID-Z configuration. For example: zpool add mypool raidz2 c2d1 c3d1 c4d1 c5d1 Disks, disk slices, or files that are used in nonredundant pools function as top-level virtual devices. For an overview of creating and managing ZFS storage pools see the zpoolconcepts 7 manual page. The log is saved persistently on disk, which means that the log is saved across system reboots. For example, the following syntax displays the command output for the root pool: zpool history History for 'rpool':