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JBOD
Logical Volume Manager (Linux) – Common uses
Creating single logical volumes of multiple physical volumes or entire hard disks (somewhat similar to RAID 0, but more similar to JBOD), allowing for dynamic volume resizing.
Non-standard RAID levels – BeyondRAID
It has the advantage of supporting multiple disk sizes at once, much like JBOD, while providing redundancy for all disks and allowing a hot-swap upgrade at any time
Vinum volume manager
Vinum, is a logical volume manager, also called Software RAID, allowing implementations of the RAID-0, RAID-1 and RAID-5 models, both individually and in combination. Vinum is part of the base distribution of the FreeBSD operating system. Versions exist for NetBSD, OpenBSD and DragonFly BSD. Vinum source code is currently maintained in the FreeBSD source tree. Vinum supports raid levels 0, 1, 5, and JBOD. Vinum is invoked as gvinum (GEOM Vinum) on FreeBSD version 5.4 and up.
Windows 2000 – Basic and dynamic disk storage
* ‘Spanned volumes’, where up to 32 disks show up as one, increasing it in size but not enhancing performance. When one disk fails, the array is destroyed. Some data may be recoverable. This corresponds to JBOD#Concatenation (JBOD or SPAN)|JBOD and not to Redundant array of independent disks#RAID 1|RAID-1.
Synology Inc. – Company Milestones
** DSM 2.1 is released. New features: GUI update, RAID-5+Spare support, JBOD Support, and storage scalability.
Logical Volume Manager (Linux) – Common uses
* Creating single logical volumes of multiple physical volumes or entire hard disks (somewhat similar to RAID 0, but more similar to JBOD), allowing for dynamic volume resizing.
Windows Server 2003 – Features
* ‘JBOD systems’: JBOD (Just a bunch of discs) systems, by using VDS, can manage a group of individual storage devices as a single unit. There is no need for the storage units to be of the same maker and model.
Sun Modular Datacenter – History
In late 2003, employees of the Internet Archive wrote a paper proposing an outdoor petabyte JBOD Network-attached storage|NAS box of sufficient capacity to store the then-current Archive in a 40′ shipping container. The first implementation of the concept have been realized using Sun Microsystems’ Modular Datacenters in March 2009.
Gluster – Architecture
The GlusterFS architecture aggregates compute, storage, and I/O resources into a global namespace. Each server plus attached commodity storage (configured as direct-attached storage, JBOD, or using a storage area network) is considered to be a node. Capacity is scaled by adding additional nodes or adding additional storage to each node. Performance is increased by deploying storage among more nodes. High availability is achieved by replicating data n-way between nodes.
ZFS – ZFS and hardware RAID
Therefore the recommendation is to not use a hardware RAID card, or to flash a hardware RAID card into JBOD/IT mode
ZFS – ZFS and hardware RAID
When using hardware RAID, the controller usually adds controller-dependent data to the drives which prevents software RAID from accessing the user data. While it is possible to read the data with a compatible hardware RAID controller, this inconveniences consumers as a compatible controller usually isn’t readily available. Using the JBOD/RAID-Z combination, any disk controller can be used to resume operation after a controller failure.
ZFS – ZFS and hardware RAID
Note that hardware RAID configured as JBOD may still detach disks that do not respond in time (like green hard drives), and as such, may require Time-Limited Error Recovery|TLER/CCTL/ERC-enabled disks to prevent drive dropouts.
Windows Home Server – Drive Extender
* Arbitrary storage expansion by supporting any type of hard disk drive (Serial ATA, Universal Serial Bus|USB, FireWire etc.) in any mixture and capacity mdash; similar in concept to Non-RAID drive architectures#JBOD|JBOD
Massive array of idle disks
* ‘JBOD’ (derived from ‘just a bunch of disks’): an architecture involving multiple hard drives, while making them accessible either as independent hard drives, or as a combined (spanned) single logical volume with no actual RAID functionality.
Massive array of idle disks
* ‘SPAN’ or ‘BIG’: A method of combining the free space on multiple hard drives to create a spanned volume. Such a concatenation is sometimes also called JBOD. A SPAN or BIG is generally a spanned volume only, as it often contains mismatched types and sizes of hard drives.
Massive array of idle disks – JBOD
‘JBOD’ (abbreviated from ‘just a bunch of disks’) is an architecture using multiple hard drives, but not in a RAID configuration, thus providing neither redundancy nor performance improvements. Hard drives may be handled independently as separate logical volumes, or they may be combined into a single logical volume using a volume manager like Logical Volume Manager (Linux)|LVM; such volumes are usually called spanned.
Massive array of idle disks – JBOD
When combined into a single logical volume, JBOD configurations are also called linear, as separate hard drives are concatenated in a linear manner to form a logical volume. Due to its nature, no redundancy is provided with this configuration, meaning that failure of a single hard drive destroys the logical volume as a whole. Linux software RAID (md), in addition to LVM, supports creation of such non-RAID linear volumes.
RAID1 – Non-standard RAID levels and non-RAID drive architectures
Alternatives to the above designs include nested RAID levels, non-standard RAID levels, and non-RAID drive architectures. Non-RAID drive architectures are referred to by similar acronyms, notably non-RAID drive architectures#SLED|SLED, JBOD|Just a Bunch of Disks, Spanned volume|SPAN/BIG, and Massive array of idle disks|MAID.
OpenMediaVault – Features
* RAID#Software-RAID|Software-RAID with the RAID#Standard levels|RAID-Level 0, 1, 4, 5, 6 and 10 plus JBOD
Digital cinematography – File-based workflows
Such RAID arrays, both of managed (for example, Storage Area Network|SANs and Network Attached Storage|NASs) and unmanaged (for example, Just a Bunch of Disks|JBoDs on a single computer workstation), are necessary due to the enormous throughput required for real-time (320 MB/s for 2K @ 24fps) or near-real-time playback in post-production, compared to throughput available from a single, yet fast, hard disk drive
Linux MD RAID 10 – BeyondRAID
It has the advantage of supporting multiple disk sizes at once, much like JBOD, while providing redundancy for all disks and allowing a hot-swap upgrade at any time
List of Thunderbolt-compatible devices – Hard Drive and SSD solutions
*[http://www.datoptic.com/ec/jbod-raid-data-storage-solutions/thunderbolt.html Desktop and rackmount Thunderbolt options with or without drives]
Spanned volume
Spanned volumes are a non-RAID drive architecture, and may be implemented in hardware or software; they may be referred to as Concatenation, SPAN, BIG, or JBOD, though this latter is ambiguous – JBOD may also refer to each physical disk being presented as a separate logical volume.
Dual-channel architecture – Ganged versus unganged
On the other hand, with JBOD (which equals to unganged mode) it is relied on the statistical usage patterns to ensure increased overall performance through even usage of all available hardware units.
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