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Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Summary: This directory contains disk identifiers with more human readable names.
The disk identifier usually consists of the interface type, vendor name, model number, device serial number, and partition number. This approach is more user friendly because it simplifies identifying a specific disk. Benefits: Nice for small systems with a single disk controller.
You can take them all out, randomly mix them up on the desk, put them back anywhere in the system and your pool will still be automatically imported correctly. Drawbacks: Configuring redundancy groups based on physical location becomes difficult and error prone. Summary: This approach is to use device names which include the physical cable layout in the system, which means that a particular disk is tied to a specific location.
The name describes the PCI bus number, as well as enclosure names and port numbers. This allows the most control when configuring a large pool. Benefits: Encoding the storage topology in the name is not only helpful for locating a disk in large installations. But it also allows you to explicitly layout your redundancy groups over multiple adapters or enclosures. Example: zpool create tank pcif. Names for disks in JBODs can be generated automatically to reflect their physical location by enclosure IDs and slot numbers.
This allows you to pick your own unique meaningful names for the disks. These names will be displayed by all the zfs utilities so it can be used to clarify the administration of a large complex pool. Benefits: The main benefit of this approach is that it allows you to choose meaningful human-readable names. Beyond that, the benefits depend on the naming method employed. Example: zpool create tank mirror A1 B1 mirror A2 B2.
Several examples follow. A non-multipath configuration with direct-attached SAS enclosures and an arbitrary slot re-mapping. A multipath configuration. Note that channel names have multiple definitions - one per physical path. After defining the new disk names run udevadm trigger to prompt udev to parse the configuration file.
Following the first example above, you could then create the new pool of mirrors with the following command:. This file stores pool configuration information, such as the device names and pool state. If this file exists when running the zpool import command then it will be used to determine the list of pools available for import.
This is useful for failover configurations where the pool should always be explicitly imported by the failover software. ZoL versions 0. Inconsistent use of the flag between incremental sends can result in files being incorrectly zeroed when they are received. For more details, see issue Some are as follow;. ZFS merges the traditional volume management and filesystem layers, and it uses a copy-on-write transactional mechanism—both of these mean the system is very structurally different than conventional filesystems and RAID arrays.
The first set of major building blocks to understand are zpools , vdevs , and devices. The zpool is the uppermost ZFS structure. A zpool contains one or more vdevs , each of which in turn contains one or more devices.
Zpools are self-contained units—one physical computer may have two or more separate zpools on it, but each is entirely independent of any others. Zpools cannot share vdevs with one another.
ZFS redundancy is at the vdev level, not the zpool level. It is a common misconception that ZFS "stripes" writes across the pool—but this is inaccurate. Where does zfs store its' configuration data - is it on member drives of zpool? What would happen if USB thumbdrive dies and I need to reinstall it and access data on zpool? There is also a zpool. A zfs volume will not automatically be mounted at startup until it's imported which adds it to the cache file.
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