Dell MD3200 Spécifications Page 34
- Page / 40
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Technical Guide Book for PowerVault MD3200MD3220
32
application. A given host can concurrently have virtual disks with different capacities, different RAID
levels, and different physical disk types. This flexibility enables hosts with different capacity, performance
or data protection demands to effectively share a single storage array.
Snapshot
The MD3200 series of arrays Snapshot functionality
provides an additional level of data protection and the
means to improve production data utilization.
Snapshot enables non-production servers to access an
up-to-date copy of production data for a variety of
applications – including backup, application testing, or
data mining – while the production data remains
online and user-accessible.
A snapshot is a point-in-time image of a source virtual
disk. It is the logical equivalent of a complete physical
copy, but is created much more quickly and requires
less disk space. Snapshots appear and function as
standard virtual disks; they are host-addressable and
can be read, written to or copied.
Snapshot uses an innovative copy-on-write technology to maintain the logical snapshot virtual disk while
minimizing disk utilization. When the snapshot is “taken,” the controller suspends I/O to the source virtual
disk for a few seconds while it creates a new physical virtual disk – called the repository virtual disk – to
store snapshot metadata and copy-on-write data. When a data block on the source virtual disk is modified,
a copy-on-write occurs, copying the contents of blocks that are to be modified into the repository virtual
disk for safekeeping. This repository virtual disk combined with the original source virtual disk creates the
logical snapshot virtual disk.
Since the only data blocks that are physically stored in the repository virtual disk are those that have
changed since the time of the snapshot, the snapshot technology uses less disk space than a full physical
copy. The repository virtual disk is typically 20 percent of the base virtual disk, but will vary depending on
the amount of changes to the data. The longer a snapshot is active, the larger the repository is needed.
Virtual disk snapshot provides notification when the repository
virtual disk nears a user-specified threshold (a percentage of its
full capacity). And at any time, the volume expansion feature
can be used to dynamically expand the repository virtual disk.
Virtual Disk Copy
The MD3200 series of arrays Virtual Disk Copy functionality
provides administrators with another tool to effectively manage
information growth and maximize the utilization of the storage
array. Virtual disk copy creates a complete physical copy, or a
clone, of a virtual disk within a storage array. The clone virtual
disk is a unique entity that can be assigned to any host and
used by applications requiring a point-in-time (PiT) copy of
production data – such as backup, application testing or
development, information analysis or data mining – without
affecting the performance of the production virtual disk.
Virtual disk copy is configured and accessed via easy-to-use
wizards. It supports up to eight concurrent copies taking place within a single array. Virtual disk copy is a
Base
Virtual
disk
Virtual
disk Copy
PiT
Clone
Source
Virtual
Disk
Physical
Snapshot
Virtual
Disk
Snapshot
Repository
Logical
- Series of Storage Arrays 1
- Contents 3
- Figures 4
- Product Overview 6
- Chassis 10
- Front View and Features 11
- Hard Drives 16
- Table 5. Supported Drives 17
- Hard Drive Indicators 18
- Storage Capacity Expansion 19
- SAS Cables 20
- 6Gb SAS HBA 20
- MD Storage Manager 21
- Enterprise Window 22
- Array Window 23
- Recovery Guru 30
- Disk Group Configuration 31
- Virtual Disk Configuration 32
- Configuration Metadata 33
- Global Hot Spares 33
- Storage Partitioning 33
- Snapshot 34
- Virtual Disk Copy 34
- Online Administration 35
- Environmental 37
- Power Supply Specs 37
- Thermal management 38
- Over-Temperature Shutdown 38
- Configuration Guidelines 40
- General Configuration Rules 40
Produits connexes et manuels pour Réseaux de disques Dell MD3200
Réseaux de disques Dell H800 Spécifications
(23 pages)
(23 pages)
KitchenAid KEMS378SSS02 manuels
Manuels d'utilisation et guides de l'utilisateur pour Cuisiniers KitchenAid KEMS378SSS02.
Nous fournissons des manuels en pdf 1 KitchenAid KEMS378SSS02 à télécharger gratuitement par type de document : Manuel de l'utilisateur
Commentaires sur ces manuels